001
014
015 package com.liferay.portal.util;
016
017 import com.liferay.portal.kernel.io.unsync.UnsyncStringWriter;
018 import com.liferay.portal.kernel.security.pacl.DoPrivileged;
019 import com.liferay.portal.kernel.util.DiffHtml;
020 import com.liferay.portal.kernel.util.LocaleUtil;
021 import com.liferay.portal.kernel.util.StringPool;
022
023 import java.io.Reader;
024
025 import java.util.Locale;
026
027 import javax.xml.transform.TransformerFactory;
028 import javax.xml.transform.sax.SAXTransformerFactory;
029 import javax.xml.transform.sax.TransformerHandler;
030 import javax.xml.transform.stream.StreamResult;
031
032 import org.outerj.daisy.diff.HtmlCleaner;
033 import org.outerj.daisy.diff.XslFilter;
034 import org.outerj.daisy.diff.html.HTMLDiffer;
035 import org.outerj.daisy.diff.html.HtmlSaxDiffOutput;
036 import org.outerj.daisy.diff.html.TextNodeComparator;
037 import org.outerj.daisy.diff.html.dom.DomTreeBuilder;
038
039 import org.xml.sax.ContentHandler;
040 import org.xml.sax.InputSource;
041 import org.xml.sax.helpers.AttributesImpl;
042
043
050 @DoPrivileged
051 public class DiffHtmlImpl implements DiffHtml {
052
053
062 public String diff(Reader source, Reader target) throws Exception {
063 InputSource oldSource = new InputSource(source);
064 InputSource newSource = new InputSource(target);
065
066 UnsyncStringWriter unsyncStringWriter = new UnsyncStringWriter();
067
068 SAXTransformerFactory saxTransformerFactory =
069 (SAXTransformerFactory)TransformerFactory.newInstance();
070
071 TransformerHandler tranformHandler =
072 saxTransformerFactory.newTransformerHandler();
073
074 tranformHandler.setResult(new StreamResult(unsyncStringWriter));
075
076 XslFilter xslFilter = new XslFilter();
077
078 ContentHandler contentHandler = xslFilter.xsl(
079 tranformHandler,
080 "com/liferay/portal/util/dependencies/diff_html.xsl");
081
082 HtmlCleaner htmlCleaner = new HtmlCleaner();
083
084 DomTreeBuilder oldDomTreeBuilder = new DomTreeBuilder();
085
086 htmlCleaner.cleanAndParse(oldSource, oldDomTreeBuilder);
087
088 Locale locale = LocaleUtil.getDefault();
089
090 TextNodeComparator leftTextNodeComparator = new TextNodeComparator(
091 oldDomTreeBuilder, locale);
092
093 DomTreeBuilder newDomTreeBuilder = new DomTreeBuilder();
094
095 htmlCleaner.cleanAndParse(newSource, newDomTreeBuilder);
096
097 TextNodeComparator rightTextNodeComparator = new TextNodeComparator(
098 newDomTreeBuilder, locale);
099
100 contentHandler.startDocument();
101 contentHandler.startElement(
102 StringPool.BLANK, _DIFF_REPORT, _DIFF_REPORT, new AttributesImpl());
103 contentHandler.startElement(
104 StringPool.BLANK, _DIFF, _DIFF, new AttributesImpl());
105
106 HtmlSaxDiffOutput htmlSaxDiffOutput = new HtmlSaxDiffOutput(
107 contentHandler, _DIFF);
108
109 HTMLDiffer htmlDiffer = new HTMLDiffer(htmlSaxDiffOutput);
110
111 htmlDiffer.diff(leftTextNodeComparator, rightTextNodeComparator);
112
113 contentHandler.endElement(StringPool.BLANK, _DIFF, _DIFF);
114 contentHandler.endElement(StringPool.BLANK, _DIFF_REPORT, _DIFF_REPORT);
115 contentHandler.endDocument();
116
117 unsyncStringWriter.flush();
118
119 return unsyncStringWriter.toString();
120 }
121
122 private static final String _DIFF = "diff";
123
124 private static final String _DIFF_REPORT = "diffreport";
125
126 }