    001    // Copyright 2008, 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal;
    016
    017    import org.apache.tapestry5.EventContext;
    018
    019    /**
    020     * Placeholder used when no context is available.
    021     */
    022    public class EmptyEventContext implements EventContext
    023    {
    024        /**
    025         * Always returns zero.
    026         */
    027        public int getCount()
    028        {
    029            return 0;
    030        }
    031
    032        /**
    033         * This should never be called because the count is always zero.
    034         */
    035        public <T> T get(Class<T> desiredType, int index)
    036        {
    037            return null;
    038        }
    039
    040        public String[] toStrings()
    041        {
    042            return InternalConstants.EMPTY_STRING_ARRAY;
    043        }
    044    }