com.webslingerz.jpt.HTMLFragment.java Source code

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Here is the source code for com.webslingerz.jpt.HTMLFragment.java
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/**
 *  Java Page Templates
 *  Copyright (C) 2004 webslingerZ, inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package com.webslingerz.jpt;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Iterator;

import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import org.dom4j.io.SAXWriter;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;

/**
 * @author <a href="mailto:rossi@webslingerZ.com">Chris Rossi</a>
 * @version $Revision: 1.1 $
 */
public class HTMLFragment implements java.io.Serializable {
    private static final long serialVersionUID = -7189906840051109780L;

    private String html;
    private transient Element dom = null;

    public HTMLFragment(String html) throws PageTemplateException {
        this.html = html;
        parseFragment();
    }

    public String getHtml() {
        return html;
    }

    public void setHtml(String html) {
        this.html = html;
    }

    public String getXhtml() throws PageTemplateException {
        try {
            StringWriter buffer = new StringWriter();
            toXhtml(buffer);
            buffer.close();
            return buffer.toString();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public void toXhtml(ContentHandler contentHandler, LexicalHandler lexicalHandler)
            throws PageTemplateException, SAXException {
        if (dom == null) {
            parseFragment();
        }
        SAXWriter writer = new SAXWriter(contentHandler, lexicalHandler);
        for (Iterator<Node> i = dom.nodeIterator(); i.hasNext();) {
            Node node = i.next();
            writer.write(node);
        }
    }

    public void toXhtml(Writer writer) throws PageTemplateException, IOException {
        if (dom == null) {
            parseFragment();
        }
        for (Iterator<Node> i = dom.nodeIterator(); i.hasNext();) {
            Node node = i.next();
            node.write(writer);
        }
    }

    private void parseFragment() throws PageTemplateException {
        try {
            StringBuffer fragment = new StringBuffer(html.length() + 26);
            fragment.append("<html><body>");
            fragment.append(html);
            fragment.append("</body></html>");

            Reader input = new StringReader(fragment.toString());
            SAXReader reader = PageTemplateImpl.getXMLReader();
            try {
                dom = reader.read(input).getRootElement().element("body");
            } catch (DocumentException e) {
                try {
                    reader = PageTemplateImpl.getHTMLReader();
                    input.close();
                    input = new StringReader(fragment.toString());
                    dom = reader.read(input).getRootElement().element("body");
                } catch (NoClassDefFoundError ee) {
                    // Allow user to omit nekohtml package
                    // to disable html parsing
                    //System.err.println( "Warning: no nekohtml" );
                    //ee.printStackTrace();
                    throw e;
                }
            }
        } catch (Exception e) {
            throw new PageTemplateException(e);
        }
    }

    public String toString() {
        return getHtml();
    }
}