    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.services.ContextValueEncoder;
    018
    019/**
    020 * Implementation based on values extracted from the URL (an event context, or a page activation
    021 * context) that uses a {@link org.apache.tapestry5.services.ContextValueEncoder} to convert from
    022 * string values to the desired values.
    023 */
    024public class URLEventContext extends AbstractEventContext
    025{
    026    private final ContextValueEncoder valueEncoder;
    027
    028    private final String[] values;
    029
    030    public URLEventContext(ContextValueEncoder valueEncoder, String[] values)
    031    {
    032        this.valueEncoder = valueEncoder;
    033        this.values = values;
    034    }
    035
    036    public int getCount()
    037    {
    038        return values == null ? 0 : values.length;
    039    }
    040
    041    public <T> T get(Class<T> desiredType, int index)
    042    {
    043        return valueEncoder.toValue(desiredType, values[index]);
    044    }
    045}