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