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
052 @DoPrivileged
053 public class DiffHtmlImpl implements DiffHtml {
054
055
064 @Override
065 public String diff(Reader source, Reader target) throws Exception {
066 InputSource oldSource = new InputSource(source);
067 InputSource newSource = new InputSource(target);
068
069 UnsyncStringWriter unsyncStringWriter = new UnsyncStringWriter();
070
071 SAXTransformerFactory saxTransformerFactory =
072 (SAXTransformerFactory)TransformerFactory.newInstance();
073
074 TransformerHandler tranformHandler =
075 saxTransformerFactory.newTransformerHandler();
076
077 tranformHandler.setResult(new StreamResult(unsyncStringWriter));
078
079 XslFilter xslFilter = new XslFilter();
080
081 ContentHandler contentHandler = xslFilter.xsl(
082 tranformHandler,
083 "com/liferay/portal/util/dependencies/diff_html.xsl");
084
085 HtmlCleaner htmlCleaner = new HtmlCleaner();
086
087 DomTreeBuilder oldDomTreeBuilder = new DomTreeBuilder();
088
089 htmlCleaner.cleanAndParse(oldSource, oldDomTreeBuilder);
090
091 Locale locale = LocaleUtil.getDefault();
092
093 TextNodeComparator leftTextNodeComparator = new TextNodeComparator(
094 oldDomTreeBuilder, locale);
095
096 DomTreeBuilder newDomTreeBuilder = new DomTreeBuilder();
097
098 htmlCleaner.cleanAndParse(newSource, newDomTreeBuilder);
099
100 TextNodeComparator rightTextNodeComparator = new TextNodeComparator(
101 newDomTreeBuilder, locale);
102
103 contentHandler.startDocument();
104 contentHandler.startElement(
105 StringPool.BLANK, _DIFF_REPORT, _DIFF_REPORT, new AttributesImpl());
106 contentHandler.startElement(
107 StringPool.BLANK, _DIFF, _DIFF, new AttributesImpl());
108
109 HtmlSaxDiffOutput htmlSaxDiffOutput = new HtmlSaxDiffOutput(
110 contentHandler, _DIFF);
111
112 HTMLDiffer htmlDiffer = new HTMLDiffer(htmlSaxDiffOutput);
113
114 htmlDiffer.diff(leftTextNodeComparator, rightTextNodeComparator);
115
116 contentHandler.endElement(StringPool.BLANK, _DIFF, _DIFF);
117 contentHandler.endElement(StringPool.BLANK, _DIFF_REPORT, _DIFF_REPORT);
118 contentHandler.endDocument();
119
120 unsyncStringWriter.flush();
121
122 return unsyncStringWriter.toString();
123 }
124
125 private static final String _DIFF = "diff";
126
127 private static final String _DIFF_REPORT = "diffreport";
128
129 }