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/*
* 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.
*/
package org.apache.tuscany.sca.common.xml.stax.reader;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.util.StreamReaderDelegate;
public class WrappingXMLStreamReader extends StreamReaderDelegate implements XMLFragmentStreamReader {
private boolean done;
private int level;
public WrappingXMLStreamReader(XMLStreamReader realReader) throws XMLStreamException {
super(realReader);
if (realReader == null) {
throw new UnsupportedOperationException("Reader cannot be null");
}
if (realReader instanceof XMLFragmentStreamReader) {
((XMLFragmentStreamReader)realReader).init();
}
if (realReader.getEventType() == START_DOCUMENT) {
// Position to the 1st element
realReader.nextTag();
}
if (realReader.getEventType() != START_ELEMENT) {
throw new IllegalStateException("The reader is not positioned at START_DOCUMENT or START_ELEMENT");
}
this.done = false;
this.level = 1;
}
@Override
public boolean hasNext() throws XMLStreamException {
return !done && super.hasNext();
}
@Override
public int next() throws XMLStreamException {
if (!hasNext()) {
throw new IllegalStateException("No more events");
}
int event = super.next();
if (!super.hasNext()) {
done = true;
}
if (event == START_ELEMENT) {
level++;
} else if (event == END_ELEMENT) {
level--;
if (level == 0) {
done = true;
}
}
return event;
}
@Override
public int nextTag() throws XMLStreamException {
int event = 0;
while (true) {
event = next();
if (event == START_ELEMENT || event == END_ELEMENT) {
return event;
}
}
}
public void setParentNamespaceContext(NamespaceContext nsContext) {
// nothing to do here
}
public void init() {
// Nothing to do here
}
public boolean isDone() {
return done;
}
}
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