Changeset 4413 in josm for trunk

Timestamp:

2011-09-10T10:56:24+02:00 (13 years ago)

Author:

bastiK

Message:

make osm reader more robust - don't mess up xml structure when there are unknown elements (see #6742)

File:

• trunk/src/org/openstreetmap/josm/io/OsmReader.java (modified) (8 diffs)

trunk/src/org/openstreetmap/josm/io/OsmReader.java

@@ -5 +5 @@
 
 import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.text.MessageFormat;
 import java.util.ArrayList;
@@ -12 +13 @@
 import java.util.List;
 import java.util.Map;
-
-import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.parsers.SAXParserFactory;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.Location;
 
 import org.openstreetmap.josm.data.Bounds;
@@ -37 +43 @@
 import org.openstreetmap.josm.tools.CheckParameterUtil;
 import org.openstreetmap.josm.tools.DateUtils;
-import org.xml.sax.Attributes;
-import org.xml.sax.InputSource;
-import org.xml.sax.Locator;
-import org.xml.sax.SAXException;
-import org.xml.sax.SAXParseException;
-import org.xml.sax.helpers.DefaultHandler;
 
 /**
  * Parser for the Osm Api. Read from an input stream and construct a dataset out of it.
  *
+ * For each xml element, there is a dedicated method.
+ * The XMLStreamReader cursor points to the start of the element, when the method is
+ * entered, and it must point to the end of the same element, when it is exited.
  */
 public class OsmReader {
-    /**
-     * The dataset to add parsed objects to.
-     */
-    private DataSet ds = new DataSet();
-
-    /**
-     * Replies the parsed data set
-     *
-     * @return the parsed data set
-     */
-    public DataSet getDataSet() {
-        return ds;
-    }
-
-    /** the map from external ids to read OsmPrimitives. External ids are
-     * longs too, but in contrast to internal ids negative values are used
-     * to identify primitives unknown to the OSM server
-     */
-    private Map<PrimitiveId, OsmPrimitive> externalIdMap = new HashMap<PrimitiveId, OsmPrimitive>();
-
-    /**
-     * constructor (for private use only)
-     *
-     * @see #parseDataSet(InputStream, DataSet, ProgressMonitor)
-     * @see #parseDataSetOsm(InputStream, DataSet, ProgressMonitor)
-     */
-    private OsmReader() {
-        externalIdMap = new HashMap<PrimitiveId, OsmPrimitive>();
-    }
 
     /**
@@ -90 +64 @@
 
     /**
+     * The dataset to add parsed objects to.
+     */
+    private DataSet ds = new DataSet();
+
+    private XMLStreamReader parser;
+
+    /** the map from external ids to read OsmPrimitives. External ids are
+     * longs too, but in contrast to internal ids negative values are used
+     * to identify primitives unknown to the OSM server
+     */
+    private Map<PrimitiveId, OsmPrimitive> externalIdMap = new HashMap<PrimitiveId, OsmPrimitive>();
+
+    /**
      * Data structure for the remaining way objects
      */
@@ -99 +86 @@
     private Map<Long, Collection<RelationMemberData>> relations = new HashMap<Long, Collection<RelationMemberData>>();
 
-    private class Parser extends DefaultHandler {
-        private Locator locator;
+    /**
+     * constructor (for private use only)
+     *
+     * @see #parseDataSet(InputStream, DataSet, ProgressMonitor)
+     */
+    private OsmReader() {
+        externalIdMap = new HashMap<PrimitiveId, OsmPrimitive>();
+    }
+
+    public void setParser(XMLStreamReader parser) {
+        this.parser = parser;
+    }
+
+    /**
+     * Replies the parsed data set
+     *
+     * @return the parsed data set
+     */
+    public DataSet getDataSet() {
+        return ds;
+    }
+
+    protected void throwException(String msg) throws XMLStreamException {
+        throw new OsmParsingException(msg, parser.getLocation());
+    }
+
+    public void parse() throws XMLStreamException {
+        int event = parser.getEventType();
+        while (true) {
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                if (parser.getLocalName().equals("osm") || parser.getLocalName().equals("osmChange")) {
+                    parseOsm();
+                } else {
+                    parseUnkown();
+                }
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                return;
+            }
+            if (parser.hasNext()) {
+                event = parser.next();
+            } else {
+                break;
+            }
+        }
+        parser.close();
+    }
+
+    private void parseOsm() throws XMLStreamException {
+        String v = parser.getAttributeValue(null, "version");
+        if (v == null) {
+            throwException(tr("Missing mandatory attribute ''{0}''.", "version"));
+        }
+        if (!(v.equals("0.5") || v.equals("0.6"))) {
+            throwException(tr("Unsupported version: {0}", v));
+        }
+        String generator = parser.getAttributeValue(null, "generator");
+        ds.setVersion(v);
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                if (parser.getLocalName().equals("bounds")) {
+                    parseBounds(generator);
+                } else if (parser.getLocalName().equals("node")) {
+                    parseNode();
+                } else if (parser.getLocalName().equals("way")) {
+                    parseWay();
+                } else if (parser.getLocalName().equals("relation")) {
+                    parseRelation();
+                } else {
+                    parseUnkown();
+                }
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                return;
+            }
+        }
+    }
+
+    private void parseBounds(String generator) throws XMLStreamException {
+        String minlon = parser.getAttributeValue(null, "minlon");
+        String minlat = parser.getAttributeValue(null, "minlat");
+        String maxlon = parser.getAttributeValue(null, "maxlon");
+        String maxlat = parser.getAttributeValue(null, "maxlat");
+        String origin = parser.getAttributeValue(null, "origin");
+        if (minlon != null && maxlon != null && minlat != null && maxlat != null) {
+            if (origin == null) {
+                origin = generator;
+            }
+            Bounds bounds = new Bounds(
+                    Double.parseDouble(minlat), Double.parseDouble(minlon),
+                    Double.parseDouble(maxlat), Double.parseDouble(maxlon));
+            if (bounds.isOutOfTheWorld()) {
+                Bounds copy = new Bounds(bounds);
+                bounds.normalize();
+                System.out.println("Bbox " + copy + " is out of the world, normalized to " + bounds);
+            }
+            DataSource src = new DataSource(bounds, origin);
+            ds.dataSources.add(src);
+        } else {
+            throwException(tr(
+                    "Missing mandatory attributes on element ''bounds''. Got minlon=''{0}'',minlat=''{1}'',maxlon=''{3}'',maxlat=''{4}'', origin=''{5}''.",
+                    minlon, minlat, maxlon, maxlat, origin
+            ));
+        }
+        jumpToEnd();
+    }
+
+    private void parseNode() throws XMLStreamException {
+        NodeData nd = new NodeData();
+        nd.setCoor(new LatLon(Double.parseDouble(parser.getAttributeValue(null, "lat")), Double.parseDouble(parser.getAttributeValue(null, "lon"))));
+        readCommon(nd);
+        Node n = new Node(nd.getId(), nd.getVersion());
+        n.setVisible(nd.isVisible());
+        n.load(nd);
+        externalIdMap.put(nd.getPrimitiveId(), n);
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                if (parser.getLocalName().equals("tag")) {
+                    parseTag(n);
+                } else {
+                    parseUnkown();
+                }
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                return;
+            }
+        }
+    }
+
+    private void parseWay() throws XMLStreamException {
+        WayData wd = new WayData();
+        readCommon(wd);
+        Way w = new Way(wd.getId(), wd.getVersion());
+        w.setVisible(wd.isVisible());
+        w.load(wd);
+        externalIdMap.put(wd.getPrimitiveId(), w);
+
+        Collection<Long> nodeIds = new ArrayList<Long>();
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                if (parser.getLocalName().equals("nd")) {
+                    nodeIds.add(parseWayNode(w));
+                } else if (parser.getLocalName().equals("tag")) {
+                    parseTag(w);
+                } else {
+                    parseUnkown();
+                }
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                break;
+            }
+        }
+        if (w.isDeleted() && nodeIds.size() > 0) {
+            System.out.println(tr("Deleted way {0} contains nodes", w.getUniqueId()));
+            nodeIds = new ArrayList<Long>();
+        }
+        ways.put(wd.getUniqueId(), nodeIds);
+    }
+
+    private long parseWayNode(Way w) throws XMLStreamException {
+        if (parser.getAttributeValue(null, "ref") == null) {
+            throwException(
+                    tr("Missing mandatory attribute ''{0}'' on <nd> of way {1}.", "ref", w.getUniqueId())
+            );
+        }
+        long id = getLong("ref");
+        if (id == 0) {
+            throwException(
+                    tr("Illegal value of attribute ''ref'' of element <nd>. Got {0}.", id)
+            );
+        }
+        jumpToEnd();
+        return id;
+    }
+
+    private void parseRelation() throws XMLStreamException {
+        RelationData rd = new RelationData();
+        readCommon(rd);
+        Relation r = new Relation(rd.getId(), rd.getVersion());
+        r.setVisible(rd.isVisible());
+        r.load(rd);
+        externalIdMap.put(rd.getPrimitiveId(), r);
+
+        Collection<RelationMemberData> members = new ArrayList<RelationMemberData>();
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                if (parser.getLocalName().equals("member")) {
+                    members.add(parseRelationMember(r));
+                } else if (parser.getLocalName().equals("tag")) {
+                    parseTag(r);
+                } else {
+                    parseUnkown();
+                }
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                break;
+            }
+        }
+        if (r.isDeleted() && members.size() > 0) {
+            System.out.println(tr("Deleted relation {0} contains members", r.getUniqueId()));
+            members = new ArrayList<RelationMemberData>();
+        }
+        relations.put(rd.getUniqueId(), members);
+    }
+
+    private RelationMemberData parseRelationMember(Relation r) throws XMLStreamException {
+        RelationMemberData emd = new RelationMemberData();
+        String value = parser.getAttributeValue(null, "ref");
+        if (value == null) {
+            throwException(tr("Missing attribute ''ref'' on member in relation {0}.",r.getUniqueId()));
+        }
+        try {
+            emd.id = Long.parseLong(value);
+        } catch(NumberFormatException e) {
+            throwException(tr("Illegal value for attribute ''ref'' on member in relation {0}. Got {1}", Long.toString(r.getUniqueId()),value));
+        }
+        value = parser.getAttributeValue(null, "type");
+        if (value == null) {
+            throwException(tr("Missing attribute ''type'' on member {0} in relation {1}.", Long.toString(emd.id), Long.toString(r.getUniqueId())));
+        }
+        try {
+            emd.type = OsmPrimitiveType.fromApiTypeName(value);
+        } catch(IllegalArgumentException e) {
+            throwException(tr("Illegal value for attribute ''type'' on member {0} in relation {1}. Got {2}.", Long.toString(emd.id), Long.toString(r.getUniqueId()), value));
+        }
+        value = parser.getAttributeValue(null, "role");
+        emd.role = value;
+
+        if (emd.id == 0) {
+            throwException(tr("Incomplete <member> specification with ref=0"));
+        }
+        jumpToEnd();
+        return emd;
+    }
+
+    private void parseTag(OsmPrimitive osm) throws XMLStreamException {
+        String key = parser.getAttributeValue(null, "k");
+        String value = parser.getAttributeValue(null, "v");
+        if (key == null || value == null) {
+            throwException(tr("Missing key or value attribute in tag."));
+        }
+        osm.put(key.intern(), value.intern());
+        jumpToEnd();
+    }
+
+    /**
+     * When cursor is at the start of an element, moves it to the end tag of that element.
+     * Nested content is skipped.
+     *
+     * This is basically the same code as parseUnkown(), except for the warnings, which
+     * are displayed for inner elements and not at top level.
+     */
+    private void jumpToEnd() throws XMLStreamException {
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                parseUnkown();
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                return;
+            }
+        }
+    }
+
+    private void parseUnkown() throws XMLStreamException {
+        parseUnkown(true);
+    }
+
+    private void parseUnkown(boolean printWarning) throws XMLStreamException {
+        if (printWarning) {
+            System.out.println(tr("Undefined element ''{0}'' found in input stream. Skipping.", parser.getLocalName()));
+        }
+        while (true) {
+            int event = parser.next();
+            if (event == XMLStreamConstants.START_ELEMENT) {
+                parseUnkown(false); /* no more warning for inner elements */
+            } else if (event == XMLStreamConstants.END_ELEMENT) {
+                return;
+            }
+        }
+    }
+
+    private User createUser(String uid, String name) throws XMLStreamException {
+        if (uid == null) {
+            if (name == null)
+                return null;
+            return User.createLocalUser(name);
+        }
+        try {
+            long id = Long.parseLong(uid);
+            return User.createOsmUser(id, name);
+        } catch(NumberFormatException e) {
+            throwException(MessageFormat.format("Illegal value for attribute ''uid''. Got ''{0}''.", uid));
+        }
+        return null;
+    }
+
+    /**
+     * Read out the common attributes and put them into current OsmPrimitive.
+     */
+    private void readCommon(PrimitiveData current) throws XMLStreamException {
+        current.setId(getLong("id"));
+        if (current.getUniqueId() == 0) {
+            throwException(tr("Illegal object with ID=0."));
+        }
+
+        String time = parser.getAttributeValue(null, "timestamp");
+        if (time != null && time.length() != 0) {
+            current.setTimestamp(DateUtils.fromString(time));
+        }
+
+        // user attribute added in 0.4 API
+        String user = parser.getAttributeValue(null, "user");
+        // uid attribute added in 0.6 API
+        String uid = parser.getAttributeValue(null, "uid");
+        current.setUser(createUser(uid, user));
+
+        // visible attribute added in 0.4 API
+        String visible = parser.getAttributeValue(null, "visible");
+        if (visible != null) {
+            current.setVisible(Boolean.parseBoolean(visible));
+        }
+
+        String versionString = parser.getAttributeValue(null, "version");
+        int version = 0;
+        if (versionString != null) {
+            try {
+                version = Integer.parseInt(versionString);
+            } catch(NumberFormatException e) {
+                throwException(tr("Illegal value for attribute ''version'' on OSM primitive with ID {0}. Got {1}.", Long.toString(current.getUniqueId()), versionString));
+            }
+            if (ds.getVersion().equals("0.6")){
+                if (version <= 0 && current.getUniqueId() > 0) {
+                    throwException(tr("Illegal value for attribute ''version'' on OSM primitive with ID {0}. Got {1}.", Long.toString(current.getUniqueId()), versionString));
+                } else if (version < 0 && current.getUniqueId() <= 0) {
+                    System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 0, "0.6"));
+                    version = 0;
+                }
+            } else if (ds.getVersion().equals("0.5")) {
+                if (version <= 0 && current.getUniqueId() > 0) {
+                    System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 1, "0.5"));
+                    version = 1;
+                } else if (version < 0 && current.getUniqueId() <= 0) {
+                    System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 0, "0.5"));
+                    version = 0;
+                }
+            } else {
+                // should not happen. API version has been checked before
+                throwException(tr("Unknown or unsupported API version. Got {0}.", ds.getVersion()));
+            }
+        } else {
+            // version expected for OSM primitives with an id assigned by the server (id > 0), since API 0.6
+            //
+            if (current.getUniqueId() > 0 && ds.getVersion() != null && ds.getVersion().equals("0.6")) {
+                throwException(tr("Missing attribute ''version'' on OSM primitive with ID {0}.", Long.toString(current.getUniqueId())));
+            } else if (current.getUniqueId() > 0 && ds.getVersion() != null && ds.getVersion().equals("0.5")) {
+                // default version in 0.5 files for existing primitives
+                System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 1, "0.5"));
+                version= 1;
+            } else if (current.getUniqueId() <= 0 && ds.getVersion() != null && ds.getVersion().equals("0.5")) {
+                // default version in 0.5 files for new primitives, no warning necessary. This is
+                // (was) legal in API 0.5
+                version= 0;
+            }
+        }
+        current.setVersion(version);
+
+        String action = parser.getAttributeValue(null, "action");
+        if (action == null) {
+            // do nothing
+        } else if (action.equals("delete")) {
+            current.setDeleted(true);
+            current.setModified(current.isVisible());
+        } else if (action.equals("modify")) {
+            current.setModified(true);
+        }
+
+        String v = parser.getAttributeValue(null, "changeset");
+        if (v == null) {
+            current.setChangesetId(0);
+        } else {
+            try {
+                current.setChangesetId(Integer.parseInt(v));
+            } catch(NumberFormatException e) {
+                if (current.getUniqueId() <= 0) {
+                    // for a new primitive we just log a warning
+                    System.out.println(tr("Illegal value for attribute ''changeset'' on new object {1}. Got {0}. Resetting to 0.", v, current.getUniqueId()));
+                    current.setChangesetId(0);
+                } else {
+                    // for an existing primitive this is a problem
+                    throwException(tr("Illegal value for attribute ''changeset''. Got {0}.", v));
+                }
+            }
+            if (current.getChangesetId() <=0) {
+                if (current.getUniqueId() <= 0) {
+                    // for a new primitive we just log a warning
+                    System.out.println(tr("Illegal value for attribute ''changeset'' on new object {1}. Got {0}. Resetting to 0.", v, current.getUniqueId()));
+                    current.setChangesetId(0);
+                } else {
+                    // for an existing primitive this is a problem
+                    throwException(tr("Illegal value for attribute ''changeset''. Got {0}.", v));
+                }
+            }
+        }
+    }
+
+    private long getLong(String name) throws XMLStreamException {
+        String value = parser.getAttributeValue(null, name);
+        if (value == null) {
+            throwException(tr("Missing required attribute ''{0}''.",name));
+        }
+        try {
+            return Long.parseLong(value);
+        } catch(NumberFormatException e) {
+            throwException(tr("Illegal long value for attribute ''{0}''. Got ''{1}''.",name, value));
+        }
+        return 0; // should not happen
+    }
+
+    private static class OsmParsingException extends XMLStreamException {
+        public OsmParsingException() {
+            super();
+        }
+
+        public OsmParsingException(String msg) {
+            super(msg);
+        }
+
+        public OsmParsingException(String msg, Location location) {
+            super(msg); /* cannot use super(msg, location) because it messes with the message preventing localization */
+            this.location = location;
+        }
+
+        public OsmParsingException(String msg, Location location, Throwable th) {
+            super(msg, th);
+            this.location = location;
+        }
+
+        public OsmParsingException(String msg, Throwable th) {
+            super(msg, th);
+        }
+
+        public OsmParsingException(Throwable th) {
+            super(th);
+        }
 
         @Override
-        public void setDocumentLocator(Locator locator) {
-            this.locator = locator;
-        }
-
-        protected void throwException(String msg) throws OsmDataParsingException{
-            throw new OsmDataParsingException(msg).rememberLocation(locator);
-        }
-        /**
-         * The current osm primitive to be read.
-         */
-        private OsmPrimitive currentPrimitive;
-        private long currentExternalId;
-        private String generator;
-
-        @Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
-
-            try {
-                if (qName.equals("osm") || qName.equals("osmChange")) {
-                    if (atts == null) {
-                        throwException(tr("Missing mandatory attribute ''{0}'' of XML element {1}.", "version", qName));
-                    }
-                    String v = atts.getValue("version");
-                    if (v == null) {
-                        throwException(tr("Missing mandatory attribute ''{0}''.", "version"));
-                    }
-                    if (!(v.equals("0.5") || v.equals("0.6"))) {
-                        throwException(tr("Unsupported version: {0}", v));
-                    }
-                    // save generator attribute for later use when creating DataSource objects
-                    generator = atts.getValue("generator");
-                    ds.setVersion(v);
-
-                } else if (qName.equals("bounds")) {
-                    // new style bounds.
-                    String minlon = atts.getValue("minlon");
-                    String minlat = atts.getValue("minlat");
-                    String maxlon = atts.getValue("maxlon");
-                    String maxlat = atts.getValue("maxlat");
-                    String origin = atts.getValue("origin");
-                    if (minlon != null && maxlon != null && minlat != null && maxlat != null) {
-                        if (origin == null) {
-                            origin = generator;
-                        }
-                        Bounds bounds = new Bounds(
-                                Double.parseDouble(minlat), Double.parseDouble(minlon),
-                                Double.parseDouble(maxlat), Double.parseDouble(maxlon));
-                        if (bounds.isOutOfTheWorld()) {
-                            Bounds copy = new Bounds(bounds);
-                            bounds.normalize();
-                            System.out.println("Bbox " + copy + " is out of the world, normalized to " + bounds);
-                        }
-                        DataSource src = new DataSource(bounds, origin);
-                        ds.dataSources.add(src);
-                    } else {
-                        throwException(tr(
-                                "Missing mandatory attributes on element ''bounds''. Got minlon=''{0}'',minlat=''{1}'',maxlon=''{3}'',maxlat=''{4}'', origin=''{5}''.",
-                                minlon, minlat, maxlon, maxlat, origin
-                        ));
-                    }
-
-                    // ---- PARSING NODES AND WAYS ----
-
-                } else if (qName.equals("node")) {
-                    NodeData nd = new NodeData();
-                    nd.setCoor(new LatLon(getDouble(atts, "lat"), getDouble(atts, "lon")));
-                    readCommon(atts, nd);
-                    Node n = new Node(nd.getId(), nd.getVersion());
-                    n.setVisible(nd.isVisible());
-                    n.load(nd);
-                    externalIdMap.put(nd.getPrimitiveId(), n);
-                    currentPrimitive = n;
-                    currentExternalId = nd.getUniqueId();
-                } else if (qName.equals("way")) {
-                    WayData wd = new WayData();
-                    readCommon(atts, wd);
-                    Way w = new Way(wd.getId(), wd.getVersion());
-                    w.setVisible(wd.isVisible());
-                    w.load(wd);
-                    externalIdMap.put(wd.getPrimitiveId(), w);
-                    ways.put(wd.getUniqueId(), new ArrayList<Long>());
-                    currentPrimitive = w;
-                    currentExternalId = wd.getUniqueId();
-                } else if (qName.equals("nd")) {
-                    Collection<Long> list = ways.get(currentExternalId);
-                    if (list == null) {
-                        throwException(
-                                tr("Found XML element <nd> not as direct child of element <way>.")
-                        );
-                    }
-                    if (atts.getValue("ref") == null) {
-                        throwException(
-                                tr("Missing mandatory attribute ''{0}'' on <nd> of way {1}.", "ref", currentPrimitive.getUniqueId())
-                        );
-                    }
-                    long id = getLong(atts, "ref");
-                    if (id == 0) {
-                        throwException(
-                                tr("Illegal value of attribute ''ref'' of element <nd>. Got {0}.", id)
-                        );
-                    }
-                    if (currentPrimitive.isDeleted()) {
-                        System.out.println(tr("Deleted way {0} contains nodes", currentPrimitive.getUniqueId()));
-                    } else {
-                        list.add(id);
-                    }
-
-                    // ---- PARSING RELATIONS ----
-
-                } else if (qName.equals("relation")) {
-                    RelationData rd = new RelationData();
-                    readCommon(atts, rd);
-                    Relation r = new Relation(rd.getId(), rd.getVersion());
-                    r.setVisible(rd.isVisible());
-                    r.load(rd);
-                    externalIdMap.put(rd.getPrimitiveId(), r);
-                    relations.put(rd.getUniqueId(), new LinkedList<RelationMemberData>());
-                    currentPrimitive = r;
-                    currentExternalId = rd.getUniqueId();
-                } else if (qName.equals("member")) {
-                    Collection<RelationMemberData> list = relations.get(currentExternalId);
-                    if (list == null) {
-                        throwException(
-                                tr("Found XML element <member> not as direct child of element <relation>.")
-                        );
-                    }
-                    RelationMemberData emd = new RelationMemberData();
-                    String value = atts.getValue("ref");
-                    if (value == null) {
-                        throwException(tr("Missing attribute ''ref'' on member in relation {0}.",currentPrimitive.getUniqueId()));
-                    }
-                    try {
-                        emd.id = Long.parseLong(value);
-                    } catch(NumberFormatException e) {
-                        throwException(tr("Illegal value for attribute ''ref'' on member in relation {0}. Got {1}", Long.toString(currentPrimitive.getUniqueId()),value));
-                    }
-                    value = atts.getValue("type");
-                    if (value == null) {
-                        throwException(tr("Missing attribute ''type'' on member {0} in relation {1}.", Long.toString(emd.id), Long.toString(currentPrimitive.getUniqueId())));
-                    }
-                    try {
-                        emd.type = OsmPrimitiveType.fromApiTypeName(value);
-                    } catch(IllegalArgumentException e) {
-                        throwException(tr("Illegal value for attribute ''type'' on member {0} in relation {1}. Got {2}.", Long.toString(emd.id), Long.toString(currentPrimitive.getUniqueId()), value));
-                    }
-                    value = atts.getValue("role");
-                    emd.role = value;
-
-                    if (emd.id == 0) {
-                        throwException(tr("Incomplete <member> specification with ref=0"));
-                    }
-
-                    if (currentPrimitive.isDeleted()) {
-                        System.out.println(tr("Deleted relation {0} contains members", currentPrimitive.getUniqueId()));
-                    } else {
-                        list.add(emd);
-                    }
-
-                    // ---- PARSING TAGS (applicable to all objects) ----
-
-                } else if (qName.equals("tag")) {
-                    String key = atts.getValue("k");
-                    String value = atts.getValue("v");
-                    if (key == null || value == null) {
-                        throwException(tr("Missing key or value attribute in tag."));
-                    }
-                    if (currentPrimitive != null) {
-                        currentPrimitive.put(key.intern(), value.intern());
-                    }
-                } else {
-                    System.out.println(tr("Undefined element ''{0}'' found in input stream. Skipping.", qName));
-                }
-            } catch (Exception e) {
-                throw new SAXParseException(e.getMessage(), locator, e);
-            }
-        }
-
-        private double getDouble(Attributes atts, String value) {
-            return Double.parseDouble(atts.getValue(value));
-        }
-
-        private User createUser(String uid, String name) throws SAXException {
-            if (uid == null) {
-                if (name == null)
-                    return null;
-                return User.createLocalUser(name);
-            }
-            try {
-                long id = Long.parseLong(uid);
-                return User.createOsmUser(id, name);
-            } catch(NumberFormatException e) {
-                throwException(MessageFormat.format("Illegal value for attribute ''uid''. Got ''{0}''.", uid));
-            }
-            return null;
-        }
-        /**
-         * Read out the common attributes from atts and put them into this.current.
-         */
-        void readCommon(Attributes atts, PrimitiveData current) throws SAXException {
-            current.setId(getLong(atts, "id"));
-            if (current.getUniqueId() == 0) {
-                throwException(tr("Illegal object with ID=0."));
-            }
-
-            String time = atts.getValue("timestamp");
-            if (time != null && time.length() != 0) {
-                current.setTimestamp(DateUtils.fromString(time));
-            }
-
-            // user attribute added in 0.4 API
-            String user = atts.getValue("user");
-            // uid attribute added in 0.6 API
-            String uid = atts.getValue("uid");
-            current.setUser(createUser(uid, user));
-
-            // visible attribute added in 0.4 API
-            String visible = atts.getValue("visible");
-            if (visible != null) {
-                current.setVisible(Boolean.parseBoolean(visible));
-            }
-
-            String versionString = atts.getValue("version");
-            int version = 0;
-            if (versionString != null) {
-                try {
-                    version = Integer.parseInt(versionString);
-                } catch(NumberFormatException e) {
-                    throwException(tr("Illegal value for attribute ''version'' on OSM primitive with ID {0}. Got {1}.", Long.toString(current.getUniqueId()), versionString));
-                }
-                if (ds.getVersion().equals("0.6")){
-                    if (version <= 0 && current.getUniqueId() > 0) {
-                        throwException(tr("Illegal value for attribute ''version'' on OSM primitive with ID {0}. Got {1}.", Long.toString(current.getUniqueId()), versionString));
-                    } else if (version < 0 && current.getUniqueId() <= 0) {
-                        System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 0, "0.6"));
-                        version = 0;
-                    }
-                } else if (ds.getVersion().equals("0.5")) {
-                    if (version <= 0 && current.getUniqueId() > 0) {
-                        System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 1, "0.5"));
-                        version = 1;
-                    } else if (version < 0 && current.getUniqueId() <= 0) {
-                        System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 0, "0.5"));
-                        version = 0;
-                    }
-                } else {
-                    // should not happen. API version has been checked before
-                    throwException(tr("Unknown or unsupported API version. Got {0}.", ds.getVersion()));
-                }
-            } else {
-                // version expected for OSM primitives with an id assigned by the server (id > 0), since API 0.6
-                //
-                if (current.getUniqueId() > 0 && ds.getVersion() != null && ds.getVersion().equals("0.6")) {
-                    throwException(tr("Missing attribute ''version'' on OSM primitive with ID {0}.", Long.toString(current.getUniqueId())));
-                } else if (current.getUniqueId() > 0 && ds.getVersion() != null && ds.getVersion().equals("0.5")) {
-                    // default version in 0.5 files for existing primitives
-                    System.out.println(tr("WARNING: Normalizing value of attribute ''version'' of element {0} to {2}, API version is ''{3}''. Got {1}.", current.getUniqueId(), version, 1, "0.5"));
-                    version= 1;
-                } else if (current.getUniqueId() <= 0 && ds.getVersion() != null && ds.getVersion().equals("0.5")) {
-                    // default version in 0.5 files for new primitives, no warning necessary. This is
-                    // (was) legal in API 0.5
-                    version= 0;
-                }
-            }
-            current.setVersion(version);
-
-            String action = atts.getValue("action");
-            if (action == null) {
-                // do nothing
-            } else if (action.equals("delete")) {
-                current.setDeleted(true);
-                current.setModified(current.isVisible());
-            } else if (action.equals("modify")) {
-                current.setModified(true);
-            }
-
-            String v = atts.getValue("changeset");
-            if (v == null) {
-                current.setChangesetId(0);
-            } else {
-                try {
-                    current.setChangesetId(Integer.parseInt(v));
-                } catch(NumberFormatException e) {
-                    if (current.getUniqueId() <= 0) {
-                        // for a new primitive we just log a warning
-                        System.out.println(tr("Illegal value for attribute ''changeset'' on new object {1}. Got {0}. Resetting to 0.", v, current.getUniqueId()));
-                        current.setChangesetId(0);
-                    } else {
-                        // for an existing primitive this is a problem
-                        throwException(tr("Illegal value for attribute ''changeset''. Got {0}.", v));
-                    }
-                }
-                if (current.getChangesetId() <=0) {
-                    if (current.getUniqueId() <= 0) {
-                        // for a new primitive we just log a warning
-                        System.out.println(tr("Illegal value for attribute ''changeset'' on new object {1}. Got {0}. Resetting to 0.", v, current.getUniqueId()));
-                        current.setChangesetId(0);
-                    } else {
-                        // for an existing primitive this is a problem
-                        throwException(tr("Illegal value for attribute ''changeset''. Got {0}.", v));
-                    }
-                }
-            }
-        }
-
-        private long getLong(Attributes atts, String name) throws SAXException {
-            String value = atts.getValue(name);
-            if (value == null) {
-                throwException(tr("Missing required attribute ''{0}''.",name));
-            }
-            try {
-                return Long.parseLong(value);
-            } catch(NumberFormatException e) {
-                throwException(tr("Illegal long value for attribute ''{0}''. Got ''{1}''.",name, value));
-            }
-            return 0; // should not happen
+        public String getMessage() {
+            String msg = super.getMessage();
+            if (msg == null) {
+                msg = getClass().getName();
+            }
+            if (getLocation() == null)
+                return msg;
+            msg = msg + " " + tr("(at line {0}, column {1})", getLocation().getLineNumber(), getLocation().getColumnNumber());
+            return msg;
+        }
+    }
+
+    /**
+     * Processes the parsed nodes after parsing. Just adds them to
+     * the dataset
+     *
+     */
+    protected void processNodesAfterParsing() {
+        for (OsmPrimitive primitive: externalIdMap.values()) {
+            if (primitive instanceof Node) {
+                this.ds.addPrimitive(primitive);
+            }
         }
     }
@@ -462 +598 @@
 
     /**
-     * Processes the parsed nodes after parsing. Just adds them to
-     * the dataset
-     *
-     */
-    protected void processNodesAfterParsing() {
-        for (OsmPrimitive primitive: externalIdMap.values()) {
-            if (primitive instanceof Node) {
-                this.ds.addPrimitive(primitive);
-            }
-        }
-    }
-
-    /**
      * Completes the parsed relations with its members.
      *
@@ -562 +685 @@
             progressMonitor.indeterminateSubTask(tr("Parsing OSM data..."));
 
-            InputSource inputSource = new InputSource(UTFInputStreamReader.create(source, "UTF-8"));
-            SAXParserFactory.newInstance().newSAXParser().parse(inputSource, reader.new Parser());
+            InputStreamReader ir = UTFInputStreamReader.create(source, "UTF-8");
+            XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(ir);
+            reader.setParser(parser);
+            reader.parse();
             progressMonitor.worked(1);
 
@@ -579 +704 @@
         } catch(IllegalDataException e) {
             throw e;
-        } catch(ParserConfigurationException e) {
+        } catch(OsmParsingException e) {
             throw new IllegalDataException(e.getMessage(), e);
-        } catch (SAXParseException e) {
-            throw new IllegalDataException(tr("Line {0} column {1}: ", e.getLineNumber(), e.getColumnNumber()) + e.getMessage(), e);
-        } catch(SAXException e) {
-            throw new IllegalDataException(e.getMessage(), e);
+        } catch(XMLStreamException e) {
+            String msg = e.getMessage();
+            Pattern p = Pattern.compile("Message: (.+)");
+            Matcher m = p.matcher(msg);
+            if (m.find()) {
+                msg = m.group(1);
+            }
+            if (e.getLocation() != null) {
+                throw new IllegalDataException(tr("Line {0} column {1}: ", e.getLocation().getLineNumber(), e.getLocation().getColumnNumber()) + msg, e);
+            } else {
+                throw new IllegalDataException(msg, e);
+            }
         } catch(Exception e) {
             throw new IllegalDataException(e);