org.zenonpagetemplates.onePhaseImpl.HTMLFragment.java Source code

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package org.zenonpagetemplates.onePhaseImpl;

import java.io.IOException;
import java.io.Reader;
import java.io.Serializable;
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.ext.LexicalHandler;
import org.zenonpagetemplates.common.exceptions.PageTemplateException;
import org.xml.sax.SAXException;

/**
 * <p>
 *   Represents a HTML fragment and allows parsing of its HTML code.
 * </p>
 * 
 * 
 *  Zenon Page Templates
 *
 *  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 3 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
 *
 *
 * @author <a href="mailto:chris@christophermrossi.com">Chris Rossi</a>
 * @author <a href="mailto:david.javapagetemplates@gmail.com">David Cana</a>
 * @version $Revision: 1.2 $
 */
public class HTMLFragment implements Serializable {

    private static final String BODY = "body";
    private static final long serialVersionUID = 5100769357480308079L;
    private String html;
    private transient Element dom = null;

    public HTMLFragment(String html) throws PageTemplateException {

        this.html = html;

        if (ZPTContext.getInstance().isParseHTMLFragments()) {
            parseFragment();
        }
    }

    public String getHTML() {
        return this.html;
    }

    public String getHtml() {
        return this.html;
    }

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

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

    public String getXhtml() throws PageTemplateException {
        return this.getXHTML();
    }

    public String getXHTML() throws PageTemplateException {

        try {
            StringWriter buffer = new StringWriter();
            toXhtml(buffer);
            buffer.close();
            return buffer.toString();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @SuppressWarnings("unchecked")
    public void toXhtml(ContentHandler contentHandler, LexicalHandler lexicalHandler)
            throws PageTemplateException, SAXException {

        if (this.dom == null) {
            parseFragment();
        }

        //SAXWriter writer = new SAXWriter( contentHandler, lexicalHandler);
        SAXWriter writer = new ZPTSAXWriter(contentHandler, lexicalHandler);
        for (Iterator<Node> i = this.dom.nodeIterator(); i.hasNext();) {
            Node node = i.next();
            writer.write(node);
        }
    }

    @SuppressWarnings({ "unchecked" })
    public void toXhtml(Writer writer) throws PageTemplateException, IOException {

        if (this.dom == null) {
            parseFragment();
        }
        for (Iterator<Node> i = this.dom.nodeIterator(); i.hasNext();) {
            Node node = (Node) i.next();
            node.write(writer);
        }
    }

    private void parseFragment() throws PageTemplateException {

        try {
            StringBuffer fragment = new StringBuffer(this.html.length() + 26);
            fragment.append("<html><body>");
            fragment.append(this.html);
            fragment.append("</body></html>");

            Reader input = new StringReader(fragment.toString());
            SAXReader reader = PageTemplateImpl.getXMLReader();
            try {
                this.dom = reader.read(input).getRootElement().element(BODY);
            } catch (DocumentException e) {
                try {
                    reader = PageTemplateImpl.getHTMLReader();
                    if (reader == null) {
                        throw (e);
                    }
                    input.close();
                    input = new StringReader(fragment.toString());
                    this.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);
        }
    }

    @Override
    public String toString() {
        return getHTML();
    }

    public Element getDom() throws PageTemplateException {

        if (this.dom == null) {
            this.parseFragment();
        }

        return this.dom;
    }
}