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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.cxf.staxutils;
import java.util.LinkedList;
import java.util.List;
import javax.xml.stream.XMLStreamException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.apache.cxf.common.util.StringUtils;
/**
* Special StreamWriter that will "overlay" any write events onto the DOM.
* If the startElement ends up writing an element that already exists at that
* location, it will just walk into it instead of creating a new element
*/
public class OverlayW3CDOMStreamWriter extends W3CDOMStreamWriter {
List isOverlaidStack = new LinkedList();
boolean isOverlaid = true;
boolean textOverlay;
public OverlayW3CDOMStreamWriter(Document document) {
super(document);
}
public OverlayW3CDOMStreamWriter(Element e) {
super(e);
}
public OverlayW3CDOMStreamWriter(Document doc, Element e) {
super(doc, e);
}
@Override
protected void createAndAddElement(String prefix, String local, String namespace) {
super.createAndAddElement(prefix, local, namespace);
if (isOverlaid) {
try {
//mark this as new so we don't consider this for overlaying
getCurrentNode().setUserData("new", "new", null);
} catch (Throwable t) {
//ignore
}
}
}
@Override
public void writeEndElement() throws XMLStreamException {
if (isOverlaid) {
Node nd = getCurrentNode().getFirstChild();
while (nd != null) {
try {
getCurrentNode().setUserData("new", null, null);
} catch (Throwable t) {
//ignore
}
nd = nd.getNextSibling();
}
}
isOverlaid = isOverlaidStack.remove(0);
super.writeEndElement();
textOverlay = false;
}
public void writeStartElement(String local) throws XMLStreamException {
isOverlaidStack.add(0, isOverlaid);
if (isOverlaid) {
Element nd = getCurrentNode();
Node nd2 = null;
if (nd == null) {
nd2 = getDocument().getDocumentElement();
} else {
nd2 = nd.getFirstChild();
}
while (nd2 != null) {
Object userData = null;
try {
userData = nd2.getUserData("new");
} catch (Throwable t) {
//ignore - non DOM level 3
}
if (nd2.getNodeType() == Node.ELEMENT_NODE
&& local.equals(nd2.getLocalName())
&& StringUtils.isEmpty(nd2.getNamespaceURI())
&& userData != null) {
adjustOverlaidNode(nd2, null);
setChild((Element)nd2, false);
if (nd2.getFirstChild() == null) {
//optimize a case where we KNOW anything added cannot be an overlay
isOverlaid = false;
}
return;
}
nd2 = nd2.getNextSibling();
}
}
super.writeStartElement(local);
isOverlaid = false;
}
protected void adjustOverlaidNode(Node nd2, String pfx) {
}
public void writeStartElement(String namespace, String local) throws XMLStreamException {
isOverlaidStack.add(0, isOverlaid);
if (isOverlaid) {
Element nd = getCurrentNode();
Node nd2 = null;
if (nd == null) {
nd2 = getDocument().getDocumentElement();
} else {
nd2 = nd.getFirstChild();
}
while (nd2 != null) {
Object userData = null;
try {
userData = nd2.getUserData("new");
} catch (Throwable t) {
//ignore - non DOM level 3
}
if (nd2.getNodeType() == Node.ELEMENT_NODE
&& local.equals(nd2.getLocalName())
&& namespace.equals(nd2.getNamespaceURI())
&& userData == null) {
adjustOverlaidNode(nd2, "");
setChild((Element)nd2, false);
if (nd2.getFirstChild() == null) {
//optimize a case where we KNOW anything added cannot be an overlay
isOverlaid = false;
}
return;
}
nd2 = nd2.getNextSibling();
}
}
super.writeStartElement(namespace, local);
isOverlaid = false;
}
public void writeStartElement(String prefix, String local, String namespace) throws XMLStreamException {
if (prefix == null || prefix.equals("")) {
writeStartElement(namespace, local);
} else {
isOverlaidStack.add(0, isOverlaid);
if (isOverlaid) {
Element nd = getCurrentNode();
Node nd2 = null;
if (nd == null) {
nd2 = getDocument().getDocumentElement();
} else {
nd2 = nd.getFirstChild();
}
while (nd2 != null) {
Object userData = null;
try {
userData = nd2.getUserData("new");
} catch (Throwable t) {
//ignore - non DOM level 3
}
if (nd2.getNodeType() == Node.ELEMENT_NODE
&& local.equals(nd2.getLocalName())
&& namespace.equals(nd2.getNamespaceURI())
&& userData == null) {
adjustOverlaidNode(nd2, prefix);
setChild((Element)nd2, false);
if (nd2.getFirstChild() == null) {
//optimize a case where we KNOW anything added cannot be an overlay
isOverlaid = false;
}
return;
}
nd2 = nd2.getNextSibling();
}
}
super.writeStartElement(prefix, local, namespace);
isOverlaid = false;
}
}
public void writeCharacters(String text) throws XMLStreamException {
if (!isOverlaid) {
super.writeCharacters(text);
} else if (!textOverlay) {
Element nd = getCurrentNode();
Node txt = nd.getFirstChild();
if (txt instanceof Text
&& ((Text)txt).getTextContent().startsWith(text)) {
textOverlay = true;
return;
}
super.writeCharacters(text);
}
}
}
