001    /*
002     * Apache License
003     * Version 2.0, January 2004
004     * http://www.apache.org/licenses/
005     *
006     * Copyright 1996-2008 by Sven Homburg
007     *
008     * Licensed under the Apache License, Version 2.0 (the "License");
009     * you may not use this file except in compliance with the License.
010     * You may obtain a copy of the License at
011     *
012     * http://www.apache.org/licenses/LICENSE-2.0
013     */
014    
015    package org.chenillekit.tapestry.core.bindings;
016    
017    import java.util.ArrayList;
018    import java.util.List;
019    
020    import org.apache.tapestry5.Binding;
021    import org.apache.tapestry5.internal.bindings.AbstractBinding;
022    import org.apache.tapestry5.ioc.Location;
023    import org.apache.tapestry5.ioc.Messages;
024    
025    /**
026     * Binding type for collection values.
027     * This binding called by expression "messageformat:".
028     *
029     * @version $Id: MessageFormatBinding.java 594 2009-12-05 15:17:26Z mlusetti $
030     */
031    public class MessageFormatBinding extends AbstractBinding
032    {
033        private final String _messageKey;
034        private final Messages _messages;
035        private final List<Binding> _bindings;
036        private final boolean _invariant;
037    
038        public MessageFormatBinding(Location location, String messageKey, Messages messages, List<Binding> bindings, boolean invariant)
039        {
040            super(location);
041    
042            _messageKey = messageKey;
043            _messages = messages;
044            _bindings = bindings;
045            _invariant = invariant;
046        }
047    
048        public Object get()
049        {
050            List<Object> values = new ArrayList<Object>(_bindings.size());
051            for (Binding binding : _bindings)
052                values.add(binding.get());
053    
054            return _messages.format(_messageKey, values.toArray());
055        }
056    
057        @Override
058        public boolean isInvariant()
059        {
060            return this._invariant;
061        }
062    
063        @Override
064        public Class getBindingType()
065        {
066            return String.class;
067        }
068    }