/*
 * 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.components.modules.input;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.thread.ThreadSafe;

import java.util.Iterator;
import java.util.Map;

/**
 * NullInputModule returns a null object.  Use this if you want to
 * explicitly forbid a parameter to be filled. E.g. a database column
 * shall be filled with a default value, your forms never contain that
 * parameter but you don't want anyone to provide this parameter
 * manually.
 *
 * @author <a href="mailto:haul@apache.org">Christian Haul</a>
 * @version $Id$
 */
public class NullInputModule extends AbstractInputModule implements ThreadSafe {

    public Object getAttribute( String name, Configuration modeConf, Map objectModel ) throws ConfigurationException {
        
        return null;
    }


    public Iterator getAttributeNames( Configuration modeConf, Map objectModel ) throws ConfigurationException {

        return null;
    }


    public Object[] getAttributeValues( String name, Configuration modeConf, Map objectModel )
        throws ConfigurationException {

        return null;
            
    }

}