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Liferay Diff Implementation
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/*
* Copyright 2007 Guy Van den Broeck
*
* Licensed 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.outerj.daisy.diff.html;
import org.outerj.daisy.diff.html.dom.ImageNode;
import org.outerj.daisy.diff.html.dom.Node;
import org.outerj.daisy.diff.html.dom.TagNode;
import org.outerj.daisy.diff.html.dom.TextNode;
import org.outerj.daisy.diff.html.modification.Modification;
import org.outerj.daisy.diff.html.modification.ModificationType;
import org.outerj.daisy.diff.output.DiffOutput;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
/**
* Takes a branch root and creates an HTML file for it.
*/
public class HtmlSaxDiffOutput implements DiffOutput {
private ContentHandler handler;
private String prefix;
public HtmlSaxDiffOutput(ContentHandler handler, String name) {
this.handler = handler;
this.prefix = name;
}
/**
* {@inheritDoc}
*/
public void generateOutput(TagNode node) throws SAXException {
if (!node.getQName().equalsIgnoreCase("img")
&& !node.getQName().equalsIgnoreCase("body")) {
handler.startElement("", node.getQName(), node.getQName(), node
.getAttributes());
}
boolean newStarted = false;
boolean remStarted = false;
boolean changeStarted = false;
boolean conflictStarted = false;
String changeTXT = "";
for (Node child : node) {
if (child instanceof TagNode) {
if (newStarted) {
handler.endElement("", "span", "span");
newStarted = false;
} else if (changeStarted) {
handler.endElement("", "span", "span");
changeStarted = false;
} else if (remStarted) {
handler.endElement("", "span", "span");
remStarted = false;
} else if (conflictStarted) {
handler.endElement("", "span", "span");
conflictStarted = false;
}
generateOutput(((TagNode) child));
} else if (child instanceof TextNode) {
TextNode textChild = (TextNode) child;
Modification mod = textChild.getModification();
if (newStarted
&& (mod.getOutputType() != ModificationType.ADDED || mod
.isFirstOfID())) {
handler.endElement("", "span", "span");
newStarted = false;
} else if (changeStarted
&& (mod.getOutputType() != ModificationType.CHANGED
|| !mod.getChanges().equals(changeTXT) || mod
.isFirstOfID())) {
handler.endElement("", "span", "span");
changeStarted = false;
} else if (remStarted
&& (mod.getOutputType() != ModificationType.REMOVED || mod
.isFirstOfID())) {
handler.endElement("", "span", "span");
remStarted = false;
} else if (conflictStarted
&& (mod.getOutputType() != ModificationType.CONFLICT || mod
.isFirstOfID())) {
handler.endElement("", "span", "span");
conflictStarted = false;
}
// no else because a removed part can just be closed and a new
// part can start
if (!newStarted && mod.getOutputType() == ModificationType.ADDED) {
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", "class", "class", "CDATA",
"diff-html-added");
if (mod.isFirstOfID()) {
attrs.addAttribute("", "id", "id", "CDATA", mod
.getOutputType()
+ "-" + prefix + "-" + mod.getID());
}
addAttributes(mod, attrs);
handler.startElement("", "span", "span", attrs);
newStarted = true;
} else if (!changeStarted
&& mod.getOutputType() == ModificationType.CHANGED) {
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", "class", "class", "CDATA",
"diff-html-changed");
if (mod.isFirstOfID()) {
attrs.addAttribute("", "id", "id", "CDATA", mod
.getOutputType()
+ "-" + prefix + "-" + mod.getID());
}
addAttributes(mod, attrs);
handler.startElement("", "span", "span", attrs);
changeStarted = true;
changeTXT = mod.getChanges();
} else if (!remStarted
&& mod.getOutputType() == ModificationType.REMOVED) {
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", "class", "class", "CDATA",
"diff-html-removed");
if (mod.isFirstOfID()) {
attrs.addAttribute("", "id", "id", "CDATA", mod
.getOutputType()
+ "-" + prefix + "-" + mod.getID());
}
addAttributes(mod, attrs);
handler.startElement("", "span", "span", attrs);
remStarted = true;
} else if (!conflictStarted
&& mod.getOutputType() == ModificationType.CONFLICT) {
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", "class", "class", "CDATA",
"diff-html-conflict");
if (mod.isFirstOfID()) {
attrs.addAttribute("", "id", "id", "CDATA", mod
.getOutputType()
+ "-" + prefix + "-" + mod.getID());
}
addAttributes(mod, attrs);
handler.startElement("", "span", "span", attrs);
conflictStarted = true;
}
char[] chars = textChild.getText().toCharArray();
if (textChild instanceof ImageNode) {
writeImage((ImageNode)textChild);
} else {
handler.characters(chars, 0, chars.length);
}
}
}
if (newStarted) {
handler.endElement("", "span", "span");
newStarted = false;
} else if (changeStarted) {
handler.endElement("", "span", "span");
changeStarted = false;
} else if (remStarted) {
handler.endElement("", "span", "span");
remStarted = false;
} else if (conflictStarted) {
handler.endElement("", "span", "span");
conflictStarted = false;
}
if (!node.getQName().equalsIgnoreCase("img")
&& !node.getQName().equalsIgnoreCase("body"))
handler.endElement("", node.getQName(), node.getQName());
}
private void writeImage(ImageNode imgNode) throws SAXException {
AttributesImpl attrs = imgNode.getAttributes();
if (imgNode.getModification().getOutputType() == ModificationType.REMOVED) {
attrs.addAttribute("", "changeType", "changeType", "CDATA",
"diff-removed-image");
} else if (imgNode.getModification().getOutputType() == ModificationType.ADDED) {
attrs.addAttribute("", "changeType", "changeType", "CDATA",
"diff-added-image");
} else if (imgNode.getModification().getOutputType() == ModificationType.CONFLICT) {
attrs.addAttribute("", "changeType", "changeType", "CDATA",
"diff-conflict-image");
}
handler.startElement("", "img", "img", attrs);
handler.endElement("", "img", "img");
}
private void addAttributes(Modification mod, AttributesImpl attrs) {
if (mod.getOutputType() == ModificationType.CHANGED) {
String changes = mod.getChanges();
attrs.addAttribute("", "changes", "changes", "CDATA", changes);
}
String previous;
if (mod.getPrevious() == null) {
previous = "first-" + prefix;
} else {
previous = mod.getPrevious().getOutputType() + "-" + prefix + "-"
+ mod.getPrevious().getID();
}
attrs.addAttribute("", "previous", "previous", "CDATA", previous);
String changeId = mod.getOutputType() + "-" + prefix + "-" + mod.getID();
attrs.addAttribute("", "changeId", "changeId", "CDATA", changeId);
String next;
if (mod.getNext() == null) {
next = "last-" + prefix;
} else {
next = mod.getNext().getOutputType() + "-" + prefix + "-"
+ mod.getNext().getID();
}
attrs.addAttribute("", "next", "next", "CDATA", next);
}
}