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}