FOP 0.91 Serializer

[Alexander Lochschmied]

Hello everybody,

to get Apache FOP 0.91 beta working with Cocoon, a new Serializer is
necessary (the FOP API changed considerably). I wrote a very simple but
working Serializer and hope that helps a little for future releases of
Cocoon. The Serializer doesn't accept any configuration except 'mime-type'
yet.

Best regards,
Alexander

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package org.apache.cocoon.serialization;

import org.apache.fop.apps.Fop;
import java.io.OutputStream;
import java.io.Serializable;
import javax.xml.parsers.SAXParserFactory;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.Logger;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.cocoon.caching.CacheableProcessingComponent;
import org.apache.excalibur.source.SourceValidity;
import org.apache.fop.apps.FOUserAgent;
import org.xml.sax.helpers.DefaultHandler;

public class FOP091Serializer
extends AbstractSerializer
implements
Configurable, CacheableProcessingComponent, Serviceable/*, Disposable */ {
        protected Logger          logger;
        protected String          mimetype;
        protected boolean         setContentLength  = true;
        protected FOUserAgent     userAgent         = null;
        protected Fop             fop               = null;
        protected ServiceManager  manager;
        protected javax.xml.transform.stream.StreamResult res = null;
        
        public void service( ServiceManager manager )
        throws ServiceException {
                this.manager = manager;
        }
        
        public void configure( Configuration conf )
        throws ConfigurationException {         
                this.logger = getLogger().getChildLogger( "fop" );
                
                this.setContentLength =
                        conf.getChild( "set-content-length"
).getValueAsBoolean( true );
                
                String configUrl = 
                        conf.getChild( "user-config" ).getValue( null );
                
                
                this.mimetype = conf.getAttribute( "mime-type" );
                
                // TODO get and use user configuration
                // TODO get and use user's renderer definition, ...

        }
        
        public String getMimeType() {
                return this.mimetype;
        }       
        
        public void setOutputStream( OutputStream o ) {
                DefaultHandler dh = null;
                
                fop = new Fop( this.mimetype );
                
                fop.setOutputStream( o );
                
                SAXParserFactory factory = SAXParserFactory.newInstance();
                factory.setNamespaceAware( true );
                
                try {
                        dh = fop.getDefaultHandler();
                        setContentHandler( dh );
                } catch( Exception ex) {
                        ; // TODO FIXME
                }
        }
        
        public Serializable getKey() {
                return "0";
        }
        
        public SourceValidity getValidity() {
                return null; //NOPValidity.SHARED_INSTANCE;
        }
        
        public void recycle() {
                super.recycle();
                this.userAgent = null;
                this.fop = null;
        }
        
        public boolean shouldSetContentLength() {
                return this.setContentLength;
        }
}
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