/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cocoon.serialization;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.cocoon.CascadingIOException;
import org.apache.cocoon.xml.XMLUtils;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.OutputStream;
/**
* Text serializer converts XML into plain text.
* It omits all XML tags and writes only character events to the output.
* Internally, text serializer uses XML serializer with {@link OutputKeys#METHOD}
* set to <code>text</code>.
*
* <p>Input document must have at least one element - root element - which
* should wrap all the text inside it.
*
* @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a>
* @version $Id: TextSerializer.java 265735 2005-09-01 14:04:30Z cziegeler $
*/
public class TextSerializer extends AbstractTextSerializer {
/**
* Set to true after first XML element
*/
private boolean hasRootElement;
/**
* Set to true after first XML element
*/
private boolean hadNoRootElement;
/**
* Set the configurations for this serializer.
*/
public void configure(Configuration conf) throws ConfigurationException {
super.configure(conf);
this.format.put(OutputKeys.METHOD, "text");
}
/**
* Set the {@link OutputStream} where the requested resource should
* be serialized.
*/
public void setOutputStream(OutputStream out) throws IOException {
super.setOutputStream(out);
try {
TransformerHandler handler = this.getTransformerHandler();
handler.getTransformer().setOutputProperties(format);
handler.setResult(new StreamResult(this.output));
this.setContentHandler(handler);
this.setLexicalHandler(handler);
} catch (Exception e) {
final String message = "Cannot set TextSerializer outputstream";
throw new CascadingIOException(message, e);
}
}
public void startElement(String uri, String loc, String raw, Attributes a)
throws SAXException {
this.hasRootElement = true;
super.startElement(uri, loc, raw, a);
}
public void characters(char c[], int start, int len)
throws SAXException {
if (!this.hasRootElement) {
this.hasRootElement = this.hadNoRootElement = true;
getLogger().warn("Encountered text before root element. Creating <text> wrapper element.");
super.startElement("", "text", "text", XMLUtils.EMPTY_ATTRIBUTES);
}
super.characters(c, start, len);
}
public void endDocument() throws SAXException {
if (this.hadNoRootElement) {
super.endElement("", "text", "text");
}
super.endDocument();
}
public void recycle() {
super.recycle();
this.hasRootElement = false;
this.hadNoRootElement = false;
}
}