    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
    015package org.apache.tapestry5.internal;
    016
    017import org.apache.tapestry5.EventContext;
    018import org.apache.tapestry5.commons.util.CommonsUtils;
    019
    020/**
    021 * Placeholder used when no context is available.
    022 */
    023public class EmptyEventContext implements EventContext
    024{
    025    /**
    026     * Always returns zero.
    027     */
    028    public int getCount()
    029    {
    030        return 0;
    031    }
    032
    033    /**
    034     * This should never be called because the count is always zero.
    035     */
    036    public <T> T get(Class<T> desiredType, int index)
    037    {
    038        return null;
    039    }
    040
    041    public String[] toStrings()
    042    {
    043        return CommonsUtils.EMPTY_STRING_ARRAY;
    044    }
    045}