1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.awt.Color;
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5 | import java.awt.Toolkit;
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6 | import java.awt.datatransfer.Clipboard;
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7 | import java.awt.datatransfer.ClipboardOwner;
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8 | import java.awt.datatransfer.DataFlavor;
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9 | import java.awt.datatransfer.StringSelection;
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10 | import java.awt.datatransfer.Transferable;
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11 | import java.awt.datatransfer.UnsupportedFlavorException;
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12 | import java.io.BufferedReader;
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13 | import java.io.Closeable;
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14 | import java.io.File;
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15 | import java.io.FileInputStream;
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16 | import java.io.FileOutputStream;
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17 | import java.io.IOException;
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18 | import java.io.InputStream;
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19 | import java.io.InputStreamReader;
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20 | import java.io.OutputStream;
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21 | import java.io.UnsupportedEncodingException;
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22 | import java.net.HttpURLConnection;
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23 | import java.net.URL;
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24 | import java.net.URLConnection;
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25 | import java.nio.channels.FileChannel;
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26 | import java.security.MessageDigest;
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27 | import java.security.NoSuchAlgorithmException;
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28 | import java.text.MessageFormat;
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29 | import java.util.AbstractCollection;
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30 | import java.util.AbstractList;
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31 | import java.util.ArrayList;
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32 | import java.util.Collection;
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33 | import java.util.Iterator;
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34 | import java.util.List;
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35 | import java.util.zip.ZipFile;
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36 |
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37 | import org.openstreetmap.josm.Main;
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38 | import org.openstreetmap.josm.data.Version;
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39 |
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40 | /**
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41 | * Basic utils, that can be useful in different parts of the program.
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42 | */
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43 | public class Utils {
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44 |
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45 | public static <T> boolean exists(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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46 | for (T item : collection) {
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47 | if (predicate.evaluate(item))
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48 | return true;
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49 | }
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50 | return false;
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51 | }
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52 |
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53 | public static <T> boolean exists(Iterable<T> collection, Class<? extends T> klass) {
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54 | for (Object item : collection) {
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55 | if (klass.isInstance(item))
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56 | return true;
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57 | }
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58 | return false;
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59 | }
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60 |
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61 | public static <T> T find(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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62 | for (T item : collection) {
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63 | if (predicate.evaluate(item))
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64 | return item;
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65 | }
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66 | return null;
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67 | }
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68 |
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69 | @SuppressWarnings("unchecked")
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70 | public static <T> T find(Iterable<? super T> collection, Class<? extends T> klass) {
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71 | for (Object item : collection) {
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72 | if (klass.isInstance(item))
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73 | return (T) item;
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74 | }
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75 | return null;
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76 | }
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77 |
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78 | public static <T> Collection<T> filter(Collection<? extends T> collection, Predicate<? super T> predicate) {
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79 | return new FilteredCollection<T>(collection, predicate);
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80 | }
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81 |
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82 | public static <T> T firstNonNull(T... items) {
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83 | for (T i : items) {
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84 | if (i != null) {
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85 | return i;
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86 | }
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87 | }
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88 | return null;
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89 | }
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90 |
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91 | /**
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92 | * Filter a collection by (sub)class.
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93 | * This is an efficient read-only implementation.
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94 | */
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95 | public static <S, T extends S> SubclassFilteredCollection<S, T> filteredCollection(Collection<S> collection, final Class<T> klass) {
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96 | return new SubclassFilteredCollection<S, T>(collection, new Predicate<S>() {
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97 | @Override
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98 | public boolean evaluate(S o) {
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99 | return klass.isInstance(o);
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100 | }
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101 | });
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102 | }
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103 |
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104 | public static <T> int indexOf(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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105 | int i = 0;
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106 | for (T item : collection) {
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107 | if (predicate.evaluate(item))
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108 | return i;
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109 | i++;
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110 | }
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111 | return -1;
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112 | }
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113 |
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114 | /**
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115 | * Get minimum of 3 values
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116 | */
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117 | public static int min(int a, int b, int c) {
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118 | if (b < c) {
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119 | if (a < b)
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120 | return a;
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121 | return b;
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122 | } else {
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123 | if (a < c)
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124 | return a;
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125 | return c;
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126 | }
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127 | }
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128 |
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129 | public static int max(int a, int b, int c, int d) {
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130 | return Math.max(Math.max(a, b), Math.max(c, d));
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131 | }
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132 |
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133 | /**
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134 | * for convenience: test whether 2 objects are either both null or a.equals(b)
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135 | */
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136 | public static <T> boolean equal(T a, T b) {
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137 | if (a == b)
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138 | return true;
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139 | return (a != null && a.equals(b));
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140 | }
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141 |
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142 | public static void ensure(boolean condition, String message, Object...data) {
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143 | if (!condition)
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144 | throw new AssertionError(
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145 | MessageFormat.format(message,data)
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146 | );
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147 | }
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148 |
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149 | /**
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150 | * return the modulus in the range [0, n)
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151 | */
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152 | public static int mod(int a, int n) {
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153 | if (n <= 0)
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154 | throw new IllegalArgumentException();
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155 | int res = a % n;
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156 | if (res < 0) {
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157 | res += n;
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158 | }
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159 | return res;
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160 | }
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161 |
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162 | /**
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163 | * Joins a list of strings (or objects that can be converted to string via
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164 | * Object.toString()) into a single string with fields separated by sep.
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165 | * @param sep the separator
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166 | * @param values collection of objects, null is converted to the
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167 | * empty string
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168 | * @return null if values is null. The joined string otherwise.
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169 | */
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170 | public static String join(String sep, Collection<?> values) {
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171 | if (sep == null)
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172 | throw new IllegalArgumentException();
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173 | if (values == null)
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174 | return null;
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175 | if (values.isEmpty())
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176 | return "";
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177 | StringBuilder s = null;
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178 | for (Object a : values) {
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179 | if (a == null) {
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180 | a = "";
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181 | }
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182 | if (s != null) {
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183 | s.append(sep).append(a.toString());
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184 | } else {
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185 | s = new StringBuilder(a.toString());
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186 | }
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187 | }
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188 | return s.toString();
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189 | }
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190 |
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191 | public static String joinAsHtmlUnorderedList(Collection<?> values) {
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192 | StringBuilder sb = new StringBuilder(1024);
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193 | sb.append("<ul>");
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194 | for (Object i : values) {
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195 | sb.append("<li>").append(i).append("</li>");
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196 | }
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197 | sb.append("</ul>");
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198 | return sb.toString();
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199 | }
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200 |
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201 | /**
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202 | * convert Color to String
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203 | * (Color.toString() omits alpha value)
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204 | */
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205 | public static String toString(Color c) {
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206 | if (c == null)
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207 | return "null";
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208 | if (c.getAlpha() == 255)
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209 | return String.format("#%06x", c.getRGB() & 0x00ffffff);
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210 | else
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211 | return String.format("#%06x(alpha=%d)", c.getRGB() & 0x00ffffff, c.getAlpha());
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212 | }
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213 |
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214 | /**
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215 | * convert float range 0 <= x <= 1 to integer range 0..255
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216 | * when dealing with colors and color alpha value
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217 | * @return null if val is null, the corresponding int if val is in the
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218 | * range 0...1. If val is outside that range, return 255
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219 | */
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220 | public static Integer color_float2int(Float val) {
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221 | if (val == null)
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222 | return null;
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223 | if (val < 0 || val > 1)
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224 | return 255;
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225 | return (int) (255f * val + 0.5f);
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226 | }
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227 |
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228 | /**
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229 | * convert back
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230 | */
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231 | public static Float color_int2float(Integer val) {
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232 | if (val == null)
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233 | return null;
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234 | if (val < 0 || val > 255)
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235 | return 1f;
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236 | return ((float) val) / 255f;
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237 | }
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238 |
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239 | public static Color complement(Color clr) {
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240 | return new Color(255 - clr.getRed(), 255 - clr.getGreen(), 255 - clr.getBlue(), clr.getAlpha());
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241 | }
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242 |
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243 | /**
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244 | * Simple file copy function that will overwrite the target file.<br/>
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245 | * Taken from <a href="http://www.rgagnon.com/javadetails/java-0064.html">this article</a> (CC-NC-BY-SA)
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246 | * @param in The source file
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247 | * @param out The destination file
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248 | * @throws IOException If any I/O error occurs
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249 | */
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250 | public static void copyFile(File in, File out) throws IOException {
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251 | // TODO: remove this function when we move to Java 7 (use Files.copy instead)
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252 | FileInputStream inStream = null;
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253 | FileOutputStream outStream = null;
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254 | try {
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255 | inStream = new FileInputStream(in);
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256 | outStream = new FileOutputStream(out);
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257 | FileChannel inChannel = inStream.getChannel();
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258 | inChannel.transferTo(0, inChannel.size(), outStream.getChannel());
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259 | }
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260 | catch (IOException e) {
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261 | throw e;
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262 | }
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263 | finally {
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264 | close(outStream);
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265 | close(inStream);
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266 | }
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267 | }
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268 |
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269 | public static int copyStream(InputStream source, OutputStream destination) throws IOException {
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270 | int count = 0;
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271 | byte[] b = new byte[512];
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272 | int read;
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273 | while ((read = source.read(b)) != -1) {
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274 | count += read;
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275 | destination.write(b, 0, read);
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276 | }
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277 | return count;
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278 | }
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279 |
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280 | public static boolean deleteDirectory(File path) {
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281 | if( path.exists() ) {
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282 | File[] files = path.listFiles();
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283 | for(int i=0; i<files.length; i++) {
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284 | if(files[i].isDirectory()) {
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285 | deleteDirectory(files[i]);
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286 | }
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287 | else {
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288 | files[i].delete();
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289 | }
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290 | }
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291 | }
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292 | return( path.delete() );
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293 | }
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294 |
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295 | /**
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296 | * <p>Utility method for closing a {@link Closeable} object.</p>
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297 | *
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298 | * @param c the closeable object. May be null.
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299 | */
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300 | public static void close(Closeable c) {
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301 | if (c == null) return;
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302 | try {
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303 | c.close();
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304 | } catch(IOException e) {
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305 | // ignore
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306 | }
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307 | }
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308 |
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309 | /**
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310 | * <p>Utility method for closing a {@link ZipFile}.</p>
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311 | *
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312 | * @param zip the zip file. May be null.
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313 | */
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314 | public static void close(ZipFile zip) {
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315 | if (zip == null) return;
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316 | try {
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317 | zip.close();
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318 | } catch(IOException e) {
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319 | // ignore
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320 | }
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321 | }
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322 |
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323 | private final static double EPSILION = 1e-11;
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324 |
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325 | public static boolean equalsEpsilon(double a, double b) {
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326 | return Math.abs(a - b) <= EPSILION;
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327 | }
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328 |
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329 | /**
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330 | * Copies the string {@code s} to system clipboard.
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331 | * @param s string to be copied to clipboard.
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332 | * @return true if succeeded, false otherwise.
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333 | */
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334 | public static boolean copyToClipboard(String s) {
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335 | try {
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336 | Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(s), new ClipboardOwner() {
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337 |
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338 | @Override
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339 | public void lostOwnership(Clipboard clpbrd, Transferable t) {
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340 | }
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341 | });
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342 | return true;
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343 | } catch (IllegalStateException ex) {
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344 | ex.printStackTrace();
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345 | return false;
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346 | }
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347 | }
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348 |
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349 | /**
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350 | * Extracts clipboard content as string.
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351 | * @return string clipboard contents if available, {@code null} otherwise.
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352 | */
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353 | public static String getClipboardContent() {
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354 | Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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355 | Transferable t = null;
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356 | for (int tries = 0; t == null && tries < 10; tries++) {
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357 | try {
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358 | t = clipboard.getContents(null);
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359 | } catch (IllegalStateException e) {
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360 | // Clipboard currently unavailable. On some platforms, the system clipboard is unavailable while it is accessed by another application.
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361 | try {
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362 | Thread.sleep(1);
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363 | } catch (InterruptedException ex) {
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364 | }
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365 | }
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366 | }
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367 | try {
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368 | if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
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369 | String text = (String) t.getTransferData(DataFlavor.stringFlavor);
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370 | return text;
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371 | }
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372 | } catch (UnsupportedFlavorException ex) {
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373 | ex.printStackTrace();
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374 | return null;
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375 | } catch (IOException ex) {
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376 | ex.printStackTrace();
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377 | return null;
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378 | }
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379 | return null;
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380 | }
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381 |
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382 | /**
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383 | * Calculate MD5 hash of a string and output in hexadecimal format.
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384 | * @param data arbitrary String
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385 | * @return MD5 hash of data, string of length 32 with characters in range [0-9a-f]
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386 | */
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387 | public static String md5Hex(String data) {
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388 | byte[] byteData = null;
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389 | try {
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390 | byteData = data.getBytes("UTF-8");
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391 | } catch (UnsupportedEncodingException e) {
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392 | throw new RuntimeException();
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393 | }
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394 | MessageDigest md = null;
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395 | try {
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396 | md = MessageDigest.getInstance("MD5");
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397 | } catch (NoSuchAlgorithmException e) {
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398 | throw new RuntimeException();
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399 | }
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400 | byte[] byteDigest = md.digest(byteData);
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401 | return toHexString(byteDigest);
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402 | }
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403 |
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404 | /**
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405 | * Converts a byte array to a string of hexadecimal characters.
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406 | * Preserves leading zeros, so the size of the output string is always twice
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407 | * the number of input bytes.
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408 | * @param bytes the byte array
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409 | * @return hexadecimal representation
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410 | */
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411 | public static String toHexString(byte[] bytes) {
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412 | char[] hexArray = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
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413 | char[] hexChars = new char[bytes.length * 2];
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414 | for (int j=0; j<bytes.length; j++) {
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415 | int v = bytes[j] & 0xFF;
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416 | hexChars[j*2] = hexArray[v/16];
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417 | hexChars[j*2 + 1] = hexArray[v%16];
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418 | }
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419 | return new String(hexChars);
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420 | }
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421 |
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422 | /**
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423 | * Topological sort.
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424 | *
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425 | * @param dependencies contains mappings (key -> value). In the final list of sorted objects, the key will come
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426 | * after the value. (In other words, the key depends on the value(s).)
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427 | * There must not be cyclic dependencies.
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428 | * @return the list of sorted objects
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429 | */
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430 | public static <T> List<T> topologicalSort(final MultiMap<T,T> dependencies) {
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431 | MultiMap<T,T> deps = new MultiMap<T,T>();
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432 | for (T key : dependencies.keySet()) {
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433 | deps.putVoid(key);
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434 | for (T val : dependencies.get(key)) {
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435 | deps.putVoid(val);
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436 | deps.put(key, val);
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437 | }
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438 | }
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439 |
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440 | int size = deps.size();
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441 | List<T> sorted = new ArrayList<T>();
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442 | for (int i=0; i<size; ++i) {
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443 | T parentless = null;
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444 | for (T key : deps.keySet()) {
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445 | if (deps.get(key).isEmpty()) {
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446 | parentless = key;
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447 | break;
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448 | }
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449 | }
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450 | if (parentless == null) throw new RuntimeException();
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451 | sorted.add(parentless);
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452 | deps.remove(parentless);
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453 | for (T key : deps.keySet()) {
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454 | deps.remove(key, parentless);
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455 | }
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456 | }
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457 | if (sorted.size() != size) throw new RuntimeException();
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458 | return sorted;
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459 | }
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460 |
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461 | /**
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462 | * Represents a function that can be applied to objects of {@code A} and
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463 | * returns objects of {@code B}.
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464 | * @param <A> class of input objects
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465 | * @param <B> class of transformed objects
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466 | */
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467 | public static interface Function<A, B> {
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468 |
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469 | /**
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470 | * Applies the function on {@code x}.
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471 | * @param x an object of
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472 | * @return the transformed object
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473 | */
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474 | B apply(A x);
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475 | }
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476 |
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477 | /**
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478 | * Transforms the collection {@code c} into an unmodifiable collection and
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479 | * applies the {@link Function} {@code f} on each element upon access.
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480 | * @param <A> class of input collection
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481 | * @param <B> class of transformed collection
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482 | * @param c a collection
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483 | * @param f a function that transforms objects of {@code A} to objects of {@code B}
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484 | * @return the transformed unmodifiable collection
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485 | */
|
---|
486 | public static <A, B> Collection<B> transform(final Collection<? extends A> c, final Function<A, B> f) {
|
---|
487 | return new AbstractCollection<B>() {
|
---|
488 |
|
---|
489 | @Override
|
---|
490 | public int size() {
|
---|
491 | return c.size();
|
---|
492 | }
|
---|
493 |
|
---|
494 | @Override
|
---|
495 | public Iterator<B> iterator() {
|
---|
496 | return new Iterator<B>() {
|
---|
497 |
|
---|
498 | private Iterator<? extends A> it = c.iterator();
|
---|
499 |
|
---|
500 | @Override
|
---|
501 | public boolean hasNext() {
|
---|
502 | return it.hasNext();
|
---|
503 | }
|
---|
504 |
|
---|
505 | @Override
|
---|
506 | public B next() {
|
---|
507 | return f.apply(it.next());
|
---|
508 | }
|
---|
509 |
|
---|
510 | @Override
|
---|
511 | public void remove() {
|
---|
512 | throw new UnsupportedOperationException();
|
---|
513 | }
|
---|
514 | };
|
---|
515 | }
|
---|
516 | };
|
---|
517 | }
|
---|
518 |
|
---|
519 | /**
|
---|
520 | * Transforms the list {@code l} into an unmodifiable list and
|
---|
521 | * applies the {@link Function} {@code f} on each element upon access.
|
---|
522 | * @param <A> class of input collection
|
---|
523 | * @param <B> class of transformed collection
|
---|
524 | * @param l a collection
|
---|
525 | * @param f a function that transforms objects of {@code A} to objects of {@code B}
|
---|
526 | * @return the transformed unmodifiable list
|
---|
527 | */
|
---|
528 | public static <A, B> List<B> transform(final List<? extends A> l, final Function<A, B> f) {
|
---|
529 | return new AbstractList<B>() {
|
---|
530 |
|
---|
531 |
|
---|
532 | @Override
|
---|
533 | public int size() {
|
---|
534 | return l.size();
|
---|
535 | }
|
---|
536 |
|
---|
537 | @Override
|
---|
538 | public B get(int index) {
|
---|
539 | return f.apply(l.get(index));
|
---|
540 | }
|
---|
541 |
|
---|
542 |
|
---|
543 | };
|
---|
544 | }
|
---|
545 |
|
---|
546 | /**
|
---|
547 | * Convert Hex String to Color.
|
---|
548 | * @param s Must be of the form "#34a300" or "#3f2", otherwise throws Exception.
|
---|
549 | * Upper/lower case does not matter.
|
---|
550 | * @return The corresponding color.
|
---|
551 | */
|
---|
552 | static public Color hexToColor(String s) {
|
---|
553 | String clr = s.substring(1);
|
---|
554 | if (clr.length() == 3) {
|
---|
555 | clr = new String(new char[] {
|
---|
556 | clr.charAt(0), clr.charAt(0), clr.charAt(1), clr.charAt(1), clr.charAt(2), clr.charAt(2)
|
---|
557 | });
|
---|
558 | }
|
---|
559 | if (clr.length() != 6)
|
---|
560 | throw new IllegalArgumentException();
|
---|
561 | return new Color(Integer.parseInt(clr, 16));
|
---|
562 | }
|
---|
563 |
|
---|
564 | /**
|
---|
565 | * Opens a HTTP connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
566 | * @param httpURL The HTTP url to open (must use http:// or https://)
|
---|
567 | * @return An open HTTP connection to the given URL
|
---|
568 | * @throws IOException if an I/O exception occurs.
|
---|
569 | * @since 5587
|
---|
570 | */
|
---|
571 | public static HttpURLConnection openHttpConnection(URL httpURL) throws IOException {
|
---|
572 | if (httpURL == null || !httpURL.getProtocol().matches("https?")) {
|
---|
573 | throw new IllegalArgumentException("Invalid HTTP url");
|
---|
574 | }
|
---|
575 | HttpURLConnection connection = (HttpURLConnection) httpURL.openConnection();
|
---|
576 | connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
|
---|
577 | return connection;
|
---|
578 | }
|
---|
579 |
|
---|
580 | /**
|
---|
581 | * Opens a connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
582 | * @param url The url to open
|
---|
583 | * @return An stream for the given URL
|
---|
584 | * @throws IOException if an I/O exception occurs.
|
---|
585 | * @since 5867
|
---|
586 | */
|
---|
587 | public static InputStream openURL(URL url) throws IOException {
|
---|
588 | return setupURLConnection(url.openConnection()).getInputStream();
|
---|
589 | }
|
---|
590 |
|
---|
591 | /***
|
---|
592 | * Setups the given URL connection to match JOSM needs by setting its User-Agent and timeout properties.
|
---|
593 | * @param connection The connection to setup
|
---|
594 | * @return {@code connection}, with updated properties
|
---|
595 | * @since 5887
|
---|
596 | */
|
---|
597 | public static URLConnection setupURLConnection(URLConnection connection) {
|
---|
598 | if (connection != null) {
|
---|
599 | connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
|
---|
600 | connection.setConnectTimeout(Main.pref.getInteger("socket.timeout.connect",15)*1000);
|
---|
601 | connection.setReadTimeout(Main.pref.getInteger("socket.timeout.read",30)*1000);
|
---|
602 | }
|
---|
603 | return connection;
|
---|
604 | }
|
---|
605 |
|
---|
606 | /**
|
---|
607 | * Opens a connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
608 | * @param url The url to open
|
---|
609 | * @return An buffered stream reader for the given URL (using UTF-8)
|
---|
610 | * @throws IOException if an I/O exception occurs.
|
---|
611 | * @since 5868
|
---|
612 | */
|
---|
613 | public static BufferedReader openURLReader(URL url) throws IOException {
|
---|
614 | return new BufferedReader(new InputStreamReader(openURL(url), "utf-8"));
|
---|
615 | }
|
---|
616 |
|
---|
617 | /**
|
---|
618 | * Opens a HTTP connection to the given URL, sets the User-Agent property to JOSM's one and optionnaly disables Keep-Alive.
|
---|
619 | * @param httpURL The HTTP url to open (must use http:// or https://)
|
---|
620 | * @param keepAlive
|
---|
621 | * @return An open HTTP connection to the given URL
|
---|
622 | * @throws IOException if an I/O exception occurs.
|
---|
623 | * @since 5587
|
---|
624 | */
|
---|
625 | public static HttpURLConnection openHttpConnection(URL httpURL, boolean keepAlive) throws IOException {
|
---|
626 | HttpURLConnection connection = openHttpConnection(httpURL);
|
---|
627 | if (!keepAlive) {
|
---|
628 | connection.setRequestProperty("Connection", "close");
|
---|
629 | }
|
---|
630 | return connection;
|
---|
631 | }
|
---|
632 |
|
---|
633 | /**
|
---|
634 | * An alternative to {@link String#trim()} to effectively remove all leading and trailing white characters, including Unicode ones.
|
---|
635 | * @see <a href="http://closingbraces.net/2008/11/11/javastringtrim/">Java’s String.trim has a strange idea of whitespace</a>
|
---|
636 | * @see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4080617">JDK bug 4080617</a>
|
---|
637 | * @param str The string to strip
|
---|
638 | * @return <code>str</code>, without leading and trailing characters, according to
|
---|
639 | * {@link Character#isWhitespace(char)} and {@link Character#isSpaceChar(char)}.
|
---|
640 | * @since 5772
|
---|
641 | */
|
---|
642 | public static String strip(String str) {
|
---|
643 | if (str == null || str.isEmpty()) {
|
---|
644 | return str;
|
---|
645 | }
|
---|
646 | int start = 0, end = str.length();
|
---|
647 | boolean leadingWhite = true;
|
---|
648 | while (leadingWhite && start < end) {
|
---|
649 | char c = str.charAt(start);
|
---|
650 | // '\u200B' (ZERO WIDTH SPACE character) needs to be handled manually because of change in Unicode 6.0 (Java 7, see #8918)
|
---|
651 | leadingWhite = (Character.isWhitespace(c) || Character.isSpaceChar(c) || c == '\u200B');
|
---|
652 | if (leadingWhite) {
|
---|
653 | start++;
|
---|
654 | }
|
---|
655 | }
|
---|
656 | boolean trailingWhite = true;
|
---|
657 | while (trailingWhite && end > start+1) {
|
---|
658 | char c = str.charAt(end-1);
|
---|
659 | trailingWhite = (Character.isWhitespace(c) || Character.isSpaceChar(c) || c == '\u200B');
|
---|
660 | if (trailingWhite) {
|
---|
661 | end--;
|
---|
662 | }
|
---|
663 | }
|
---|
664 | return str.substring(start, end);
|
---|
665 | }
|
---|
666 |
|
---|
667 | /**
|
---|
668 | * Runs an external command and returns the standard output.
|
---|
669 | *
|
---|
670 | * The program is expected to execute fast.
|
---|
671 | *
|
---|
672 | * @param command the command with arguments
|
---|
673 | * @return the output
|
---|
674 | * @throws IOException when there was an error, e.g. command does not exist
|
---|
675 | */
|
---|
676 | public static String execOutput(List<String> command) throws IOException {
|
---|
677 | Process p = new ProcessBuilder(command).start();
|
---|
678 | BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
|
---|
679 | StringBuilder all = null;
|
---|
680 | String line;
|
---|
681 | while ((line = input.readLine()) != null) {
|
---|
682 | if (all == null) {
|
---|
683 | all = new StringBuilder(line);
|
---|
684 | } else {
|
---|
685 | all.append(line);
|
---|
686 | all.append("\n");
|
---|
687 | }
|
---|
688 | }
|
---|
689 | Utils.close(input);
|
---|
690 | return all.toString();
|
---|
691 | }
|
---|
692 |
|
---|
693 | }
|
---|