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package org.apache.tuscany.sca.contribution.processor;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.util.StreamReaderDelegate;
/*
* Custom implementaion of the XMLStreamReader to keep track of the namespace context for each element
*/
public class TuscanyXMLStreamReader extends StreamReaderDelegate implements XMLStreamReader {
Stack<List<String>[]> context = new Stack<List<String>[]>();
String characterEncodingScheme;
List<String>[] contextList;
List<String> prefixList;
List<String> uriList;
public TuscanyXMLStreamReader(XMLStreamReader reader) {
super(reader);
this.saveCharacterEncodingScheme();
}
public void pushContext() throws XMLStreamException {
contextList = new List[2];
prefixList = new ArrayList<String>();
uriList = new ArrayList<String>();
int namespaceCount = this.getNamespaceCount();
for (int i = 0; i < namespaceCount; i++) {
prefixList.add(checkString(this.getNamespacePrefix(i)));
uriList.add(this.getNamespaceURI(i));
}
contextList[0] = prefixList;
contextList[1] = uriList;
context.push(contextList);
}
private String checkString(String namespacePrefix) {
if (namespacePrefix == null) {
return XMLConstants.DEFAULT_NS_PREFIX;
} else {
return namespacePrefix;
}
}
public void popContext() throws XMLStreamException {
context.pop();
}
public void saveCharacterEncodingScheme() {
this.characterEncodingScheme = super.getCharacterEncodingScheme();
}
// A flag to indicate if the next() is called from nextTag()
private boolean withinNextTagMethod = false;
/*
* Overriding the next() method to perform PUSH and POP operations
* for the NamespaceContext for the current element
*/
@Override
public int next() throws XMLStreamException {
// POP the namespaces if the reader leaves the end element
if (!withinNextTagMethod && this.getEventType() == END_ELEMENT) {
popContext();
}
// get the next event
int nextEvent = super.next();
// PUSH the namespaces onto the stack as the reader enters the start element
if (!withinNextTagMethod && nextEvent == START_ELEMENT) {
pushContext();
}
return nextEvent;
}
@Override
public int nextTag() throws XMLStreamException {
withinNextTagMethod = true;
// POP the namespaces out of the stack if the reader leaves the end element
if (this.getEventType() == END_ELEMENT) {
popContext();
}
// REVIEW: what if nextTag() calls next()?
int event = super.nextTag();
// PUSH the namespaces onto the stack as the reader enters the start element
if (event == START_ELEMENT) {
pushContext();
}
withinNextTagMethod = false;
return event;
}
@Override
public NamespaceContext getNamespaceContext() {
return new TuscanyNamespaceContext((Stack<List<String>[]>)context.clone());
}
@Override
public String getCharacterEncodingScheme() {
return characterEncodingScheme;
}
}
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