/*
* Copyright 1999-2004 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.components.source;
import org.apache.avalon.framework.component.ComponentException;
import org.apache.avalon.framework.component.ComponentManager;
import org.apache.avalon.framework.component.ComponentSelector;
import org.apache.avalon.framework.logger.Logger;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.environment.Environment;
import org.apache.cocoon.environment.Source;
import org.apache.cocoon.serialization.Serializer;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* This abstract class provides convenience methods to implement
* a SAX based Source. Implement toSAX() and getSystemId() and
* optionally override getLastModified() and getContentLength() to
* obtain a valid Source implementation.
*
* @deprecated Use the new Avalon Excalibur Source Resolving
* @author <a href="mailto:gianugo@apache.org">Gianugo Rabellino</a>
* @version CVS $Id: AbstractSAXSource.java,v 1.3 2004/03/05 13:02:40 bdelacretaz Exp $
*/
public abstract class AbstractSAXSource
implements Source {
/** The Logger instance */
protected Logger log;
/** The ComponentManager instance */
protected ComponentManager manager;
/**
* The constructor.
*
* @param environment the Cocoon Environment.
* @param manager an Avalon Component Manager
* @param logger A LogKit logger
*/
public AbstractSAXSource(Environment environment,
ComponentManager manager,
Logger logger) {
this.log = logger;
this.manager = manager;
}
/**
* Get an InputSource for the given URL. Shamelessly stolen
* from SitemapSource.
*
*/
public InputStream getInputStream()
throws ProcessingException, IOException {
ComponentSelector serializerSelector = null;
Serializer serializer = null;
try {
serializerSelector = (ComponentSelector) this.manager.lookup(Serializer.ROLE + "Selector");
serializer = (Serializer)serializerSelector.select("xml");
ByteArrayOutputStream os = new ByteArrayOutputStream();
serializer.setOutputStream(os);
this.toSAX(serializer);
return new ByteArrayInputStream(os.toByteArray());
} catch (ComponentException cme) {
throw new ProcessingException("could not lookup pipeline components", cme);
} catch (Exception e) {
throw new ProcessingException("Exception during processing of " + this.getSystemId(), e);
} finally {
if (serializer != null) serializerSelector.release(serializer);
if (serializerSelector != null) this.manager.release(serializerSelector);
}
}
/**
* Get an InputSource for the given URL.
*
*/
public InputSource getInputSource()
throws ProcessingException, IOException {
InputSource is = new InputSource(this.getInputStream());
is.setSystemId(this.getSystemId());
return is;
}
/**
* Implement this method to obtain SAX events.
*
*/
public abstract void toSAX(ContentHandler handler)
throws SAXException;
/**
* Implement this method to set the unique identifier.
*
*/
public abstract String getSystemId();
/**
* Override this method to set the Content Length
*
*/
public long getContentLength() {
return -1;
}
/**
* Override this method to set the Last Modification date
*
*/
public long getLastModified() {
return 0;
}
}