/*
* Copyright 2000-2004 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.jetspeed.portal.portlets;
//Element Construction Set
import org.apache.ecs.ConcreteElement;
//Jetspeed stuff
import org.apache.jetspeed.portal.PortletConfig;
import org.apache.jetspeed.portal.PortletException;
import org.apache.jetspeed.util.JetspeedClearElement;
import org.apache.jetspeed.util.SimpleTransform;
import org.apache.jetspeed.cache.disk.JetspeedDiskCache;
import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
import org.apache.jetspeed.services.logging.JetspeedLogger;
import org.apache.jetspeed.services.resources.JetspeedResources;
//XML stuff
import org.xml.sax.SAXException;
//java stuff
import java.io.IOException;
/**
Provides a content publication system (like Slashdot).
@author <a href="mailto:burton@apache.org">Kevin A. Burton</a>
@version $Id: JetspeedContent.java,v 1.26 2004/02/23 04:03:34 jford Exp $
*/
public class JetspeedContent extends FileWatchPortlet
{
/**
* Static initialization of the logger for this class
*/
private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(JetspeedContent.class.getName());
public static final String PROVIDER_NAME_KEY = "provider-name";
/**
The name of the JPC provider.
*/
private String provider = "";
/**
The stylesheet for using with this provider
*/
private String stylesheet = "";
/**
The url that was specified by the provider
*/
private String url = null;
/**
Return the last time the provider's URL has been changed.
*/
private long lastModified;
/**
Init this Portlet, set it's title, description, etc.
*/
public void init() throws PortletException {
PortletConfig config = this.getPortletConfig();
provider = config.getInitParameter( PROVIDER_NAME_KEY );
if ( provider == null ) {
throw new PortletException( "You need to specify " + PROVIDER_NAME_KEY );
}
//NOTE: There are no HARD keys here in JetspeedResources. If you change
//this format of this it will break at runtime. CAREFULL!
this.url = JetspeedResources.getString( "content.provider." + provider + ".url" );
this.stylesheet = JetspeedResources.getString( "content.provider." + provider + ".stylesheet.url" );
String title = JetspeedResources.getString( "content.provider." + provider + ".title" );
String description = JetspeedResources.getString( "content.provider." + provider + ".description" );
this.setTitle( title );
this.setDescription( description );
this.setContent( this.parse( url ) );
//now make sure all the above 4 values are define within JetspeedResources
if ( url == null ||
stylesheet == null ||
title == null ||
description == null ) {
throw new PortletException( "Not all properties defined in JetspeedResources. See JetspeedResources.properties notes." );
}
this.getPortletConfig().setURL( url );
//set the last modification date for this file so that if it is
//modified this portlet can be expired from the cache.
try {
this.lastModified = JetspeedDiskCache.getInstance()
.getEntry( this.url ).getLastModified();
} catch ( IOException e ) {
logger.error("Exception", e);
}
}
/**
Parse out the JCP URL and return it as a concrete element
*/
private ConcreteElement parse( String url ) throws PortletException {
//now get the url and stylesheet from the JetspeedDiskCache store...
try {
url = JetspeedDiskCache.getInstance()
.getEntry( url ).getURL();
this.stylesheet = JetspeedDiskCache.getInstance()
.getEntry( this.stylesheet ).getURL();
} catch (IOException e) {
logger.error( "Couldn't transform content.", e );
throw new PortletException( "Couldn't transform content. Please see error log" );
}
try {
return new JetspeedClearElement( SimpleTransform.transform( url, stylesheet ) );
} catch (SAXException e) {
logger.error( "Couldn't transform content.", e );
throw new PortletException( "Couldn't transform content. Please see error log" );
}
}
}