| 1 | /*
|
|---|
| 2 | * GeoTools - The Open Source Java GIS Toolkit
|
|---|
| 3 | * http://geotools.org
|
|---|
| 4 | *
|
|---|
| 5 | * (C) 2004-2008, Open Source Geospatial Foundation (OSGeo)
|
|---|
| 6 | *
|
|---|
| 7 | * This library is free software; you can redistribute it and/or
|
|---|
| 8 | * modify it under the terms of the GNU Lesser General Public
|
|---|
| 9 | * License as published by the Free Software Foundation;
|
|---|
| 10 | * version 2.1 of the License.
|
|---|
| 11 | *
|
|---|
| 12 | * This library is distributed in the hope that it will be useful,
|
|---|
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 15 | * Lesser General Public License for more details.
|
|---|
| 16 | */
|
|---|
| 17 | package org.geotools.index.quadtree.fs;
|
|---|
| 18 |
|
|---|
| 19 | import java.io.IOException;
|
|---|
| 20 | import java.nio.ByteBuffer;
|
|---|
| 21 | import java.nio.channels.ReadableByteChannel;
|
|---|
| 22 | import java.util.logging.Logger;
|
|---|
| 23 |
|
|---|
| 24 | import org.geotools.index.quadtree.StoreException;
|
|---|
| 25 |
|
|---|
| 26 | /**
|
|---|
| 27 | * DOCUMENT ME!
|
|---|
| 28 | *
|
|---|
| 29 | * @author Tommaso Nolli
|
|---|
| 30 | *
|
|---|
| 31 | * @source $URL: http://svn.osgeo.org/geotools/branches/2.7.x/modules/plugin/shapefile/src/main/java/org/geotools/index/quadtree/fs/IndexHeader.java $
|
|---|
| 32 | */
|
|---|
| 33 | public class IndexHeader {
|
|---|
| 34 | public static final byte LSB_ORDER = -1;
|
|---|
| 35 | public static final byte MSB_ORDER = -2;
|
|---|
| 36 | public static final byte NATIVE_ORDER = 0;
|
|---|
| 37 | public static final byte NEW_LSB_ORDER = 1;
|
|---|
| 38 | public static final byte NEW_MSB_ORDER = 2;
|
|---|
| 39 | private static final String SIGNATURE = "SQT";
|
|---|
| 40 | private static final Logger LOGGER = org.geotools.util.logging.Logging
|
|---|
| 41 | .getLogger("org.geotools.index.quadtree");
|
|---|
| 42 | private byte byteOrder;
|
|---|
| 43 |
|
|---|
| 44 | /**
|
|---|
| 45 | * DOCUMENT ME!
|
|---|
| 46 | *
|
|---|
| 47 | * @param channel
|
|---|
| 48 | *
|
|---|
| 49 | * @throws IOException
|
|---|
| 50 | * @throws StoreException
|
|---|
| 51 | */
|
|---|
| 52 | public IndexHeader(ReadableByteChannel channel) throws IOException,
|
|---|
| 53 | StoreException {
|
|---|
| 54 | ByteBuffer buf = ByteBuffer.allocate(8);
|
|---|
| 55 |
|
|---|
| 56 | channel.read(buf);
|
|---|
| 57 | buf.flip();
|
|---|
| 58 |
|
|---|
| 59 | byte[] tmp = new byte[3];
|
|---|
| 60 | buf.get(tmp);
|
|---|
| 61 |
|
|---|
| 62 | String s = new String(tmp, "US-ASCII");
|
|---|
| 63 |
|
|---|
| 64 | if (!s.equals(SIGNATURE)) {
|
|---|
| 65 | // Old file format
|
|---|
| 66 | LOGGER.warning("Old qix file format; this file format "
|
|---|
| 67 | + "is deprecated; It is strongly recommended "
|
|---|
| 68 | + "to regenerate it in new format.");
|
|---|
| 69 |
|
|---|
| 70 | buf.position(0);
|
|---|
| 71 | tmp = buf.array();
|
|---|
| 72 |
|
|---|
| 73 | boolean lsb;
|
|---|
| 74 |
|
|---|
| 75 | if ((tmp[4] == 0) && (tmp[5] == 0) && (tmp[6] == 0)
|
|---|
| 76 | && (tmp[7] == 0)) {
|
|---|
| 77 | lsb = !((tmp[0] == 0) && (tmp[1] == 0));
|
|---|
| 78 | } else {
|
|---|
| 79 | lsb = !((tmp[4] == 0) && (tmp[5] == 0));
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 | this.byteOrder = lsb ? LSB_ORDER : MSB_ORDER;
|
|---|
| 83 | } else {
|
|---|
| 84 | this.byteOrder = buf.get();
|
|---|
| 85 | }
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 | /**
|
|---|
| 89 | * DOCUMENT ME!
|
|---|
| 90 | *
|
|---|
| 91 | * @return Returns the byteOrder.
|
|---|
| 92 | */
|
|---|
| 93 | public byte getByteOrder() {
|
|---|
| 94 | return this.byteOrder;
|
|---|
| 95 | }
|
|---|
| 96 | }
|
|---|
