    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
    015    package org.apache.tapestry5.internal;
    016
    017    import 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     */
    024    public 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    }