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;
018
019/**
020 * Placeholder used when no context is available.
021 */
022public 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}