/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.core.container.spring.avalon;
import java.util.Map;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.DefaultContext;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.cocoon.components.ContextHelper;
import org.apache.cocoon.environment.Environment;
import org.apache.cocoon.environment.internal.EnvironmentHelper;
/**
* This is the {@link Context} implementation for Cocoon components.
* It extends the {@link DefaultContext} by a special handling for
* getting objects from the object model and other application information.
*
* @see org.apache.cocoon.components.ContextHelper
* @version $Id: ComponentContext.java 587751 2007-10-24 02:41:36Z vgritsenko $
*/
public class ComponentContext
extends DefaultContext {
protected static final String OBJECT_MODEL_KEY_PREFIX = ContextHelper.CONTEXT_OBJECT_MODEL + '.';
/**
* Create a Context with specified parent.
*
* @param parent the parent Context (may be null)
*/
public ComponentContext(final Context parent) {
super( parent );
}
/**
* Create a Context with no parent.
*
*/
public ComponentContext() {
super();
}
/**
* Retrieve an item from the Context.
*
* @param key the key of item
* @return the item stored in context
* @throws ContextException if item not present
*/
public Object get( final Object key )
throws ContextException {
if ( ContextHelper.CONTEXT_OBJECT_MODEL.equals(key)) {
final Environment env = EnvironmentHelper.getCurrentEnvironment();
if ( env == null ) {
throw new ContextException("Unable to locate " + key + " (No environment available)");
}
return env.getObjectModel();
} else if ( ContextHelper.CONTEXT_SITEMAP_SERVICE_MANAGER.equals(key)) {
final ServiceManager manager = EnvironmentHelper.getSitemapServiceManager();
if ( manager == null ) {
throw new ContextException("Unable to locate " + key + " (No environment available)");
}
return manager;
}
if ( key instanceof String ) {
String stringKey = (String)key;
if ( stringKey.startsWith(OBJECT_MODEL_KEY_PREFIX) ) {
final Environment env = EnvironmentHelper.getCurrentEnvironment();
if ( env == null ) {
throw new ContextException("Unable to locate " + key + " (No environment available)");
}
final Map objectModel = env.getObjectModel();
String objectKey = stringKey.substring(OBJECT_MODEL_KEY_PREFIX.length());
Object o = objectModel.get( objectKey );
if ( o == null ) {
final String message = "Unable to locate " + key;
throw new ContextException( message );
}
return o;
}
}
return super.get( key );
}
}