Changeset 9887 in josm for trunk/src/org

Timestamp:

2016-02-27T15:52:04+01:00 (9 years ago)

Author:

wiktorn

Message:

Properly interpret more complex getCapabilities documents.

Keep a track of how deep into the XML tree reader has traversed. Do the
interpretation of the tags only if they are present at proper level.

If unknown tag is found, move the reader to the end of the tag, to avoid
confusion.

When using moveToReader within parseLayer, it is needed, to keep tagStack
updated.

This should fix problems with BE WMTS imagery - See: #12573

File:

• trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java (modified) (4 diffs)

trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java

@@ -20 +20 @@
 import java.util.Set;
 import java.util.SortedSet;
+import java.util.Stack;
 import java.util.TreeSet;
 import java.util.concurrent.ConcurrentHashMap;
@@ -368 +369 @@
     private static Layer parseLayer(XMLStreamReader reader) throws XMLStreamException {
         Layer layer = new Layer();
+        Stack<QName> tagStack = new Stack<>();
 
         for (int event = reader.getEventType();
@@ -373 +375 @@
                 event = reader.next()) {
             if (event == XMLStreamReader.START_ELEMENT) {
-                if (new QName(WMTS_NS_URL, "Format").equals(reader.getName())) {
-                    layer.format = reader.getElementText();
-                }
-                if (new QName(OWS_NS_URL, "Identifier").equals(reader.getName())) {
-                    layer.name = reader.getElementText();
-                }
-                if (new QName(WMTS_NS_URL, "ResourceURL").equals(reader.getName()) &&
-                        "tile".equals(reader.getAttributeValue("", "resourceType"))) {
-                    layer.baseUrl = reader.getAttributeValue("", "template");
-                }
-                if (new QName(WMTS_NS_URL, "Style").equals(reader.getName()) &&
-                        "true".equals(reader.getAttributeValue("", "isDefault")) &&
-                        moveReaderToTag(reader, new QName[] {new QName(OWS_NS_URL, "Identifier")})) {
-                    layer.style = reader.getElementText();
-                }
-                if (new QName(WMTS_NS_URL, "TileMatrixSetLink").equals(reader.getName())) {
-                    layer.tileMatrixSetLinks.add(praseTileMatrixSetLink(reader));
+                tagStack.push(reader.getName());
+                if (tagStack.size() == 2) {
+                    if (new QName(WMTS_NS_URL, "Format").equals(reader.getName())) {
+                        layer.format = reader.getElementText();
+                    } else if (new QName(OWS_NS_URL, "Identifier").equals(reader.getName())) {
+                        layer.name = reader.getElementText();
+                    } else if (new QName(WMTS_NS_URL, "ResourceURL").equals(reader.getName()) &&
+                            "tile".equals(reader.getAttributeValue("", "resourceType"))) {
+                        layer.baseUrl = reader.getAttributeValue("", "template");
+                    } else if (new QName(WMTS_NS_URL, "Style").equals(reader.getName()) &&
+                            "true".equals(reader.getAttributeValue("", "isDefault")) &&
+                            moveReaderToTag(reader, new QName[] {new QName(OWS_NS_URL, "Identifier")})) {
+                        layer.style = reader.getElementText();
+                        tagStack.push(reader.getName()); // keep tagStack in sync
+                    } else if (new QName(WMTS_NS_URL, "TileMatrixSetLink").equals(reader.getName())) {
+                        layer.tileMatrixSetLinks.add(praseTileMatrixSetLink(reader));
+                    } else {
+                        moveReaderToEndCurrentTag(reader);
+                    }
+                }
+            }
+            // need to get event type from reader, as parsing might have change position of reader
+            if (reader.getEventType() == XMLStreamReader.END_ELEMENT) {
+                QName start = tagStack.pop();
+                if (!start.equals(reader.getName())) {
+                    throw new IllegalStateException(tr("WMTS Parser error - start element {0} has different name than end element {2}",
+                            start, reader.getName()));
                 }
             }
@@ -397 +409 @@
         }
         return layer;
+    }
+
+    /**
+     * Moves the reader to the closing tag of current tag.
+     * @param reader XML stream reader positioned on XMLStreamReader.START_ELEMENT
+     * @throws XMLStreamException when parse exception occurs
+     */
+    private static void moveReaderToEndCurrentTag(XMLStreamReader reader) throws XMLStreamException {
+        int level = 0;
+        QName tag = reader.getName();
+        for (int event = reader.getEventType(); reader.hasNext(); event = reader.next()) {
+            switch (event) {
+            case XMLStreamReader.START_ELEMENT:
+                level += 1;
+                break;
+            case XMLStreamReader.END_ELEMENT:
+                level -= 1;
+                if (level == 0 && tag.equals(reader.getName())) {
+                    return;
+                }
+            }
+            if (level < 0) {
+                throw new IllegalStateException("WMTS Parser error - moveReaderToEndCurrentTag failed to find closing tag");
+            }
+        }
+        throw new IllegalStateException("WMTS Parser error - moveReaderToEndCurrentTag failed to find closing tag");
+
     }