MemoryAspectDataStore.java

/*
 * 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.portal.aspect.impl;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.portal.aspect.AspectDataStore;
import org.apache.cocoon.portal.aspect.Aspectalizable;

/**
 * An aspect data store that holds the aspects in memory.
 * 
 * @author <a href="mailto:cziegeler@s-und-n.de">Carsten Ziegeler</a>
 * 
 * @version CVS $Id$
 */
public class MemoryAspectDataStore 
    extends AbstractLogEnabled
    implements Component, ThreadSafe, AspectDataStore {
    
    protected final Map objectMap = new HashMap();
    
    /**
     * Get the aspect map for an object
     */
    protected Map getMap(Aspectalizable owner, boolean create) {
        Map result = (Map)this.objectMap.get(owner);
        if ( result == null ) {
            if ( create ) {
                result = new HashMap(4);
                this.objectMap.put(owner, result);
            } else {
                result = Collections.EMPTY_MAP;
            }
        }
        return result;
    }
    
    /* (non-Javadoc)
     * @see org.apache.cocoon.portal.aspect.AspectDataStore#getAspectData(org.apache.cocoon.portal.aspect.Aspectalizable, java.lang.String)
     */
    public Object getAspectData(Aspectalizable owner, String aspectName) {
        return this.getMap(owner, false).get( aspectName );
    }
    
    /* (non-Javadoc)
     * @see org.apache.cocoon.portal.aspect.AspectDataStore#setAspectData(org.apache.cocoon.portal.aspect.Aspectalizable, java.lang.String, java.lang.Object)
     */
    public void setAspectData(Aspectalizable owner, String aspectName, Object data) {
        this.getMap(owner, true).put(aspectName, data);
    }

    /* (non-Javadoc)
     * @see org.apache.cocoon.portal.aspect.AspectDataStore#isPersistent()
     */
    public boolean isPersistent() {
        return false;
    }
    
}