    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}