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}