001    // Copyright 2004, 2005 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.tapestry.services.impl;
016    
017    import java.util.HashMap;
018    import java.util.Iterator;
019    import java.util.List;
020    import java.util.Map;
021    
022    import org.apache.hivemind.Location;
023    import org.apache.tapestry.IBinding;
024    import org.apache.tapestry.IComponent;
025    import org.apache.tapestry.binding.BindingFactory;
026    import org.apache.tapestry.binding.BindingSource;
027    
028    /**
029     * Implementation of the <code>tapestry.bindings.BindingSource</code> service.
030     * 
031     * @author Howard Lewis Ship
032     * @since 4.0
033     */
034    public class BindingSourceImpl implements BindingSource
035    {
036        private List _contributions;
037    
038        /**
039         * Keyed on prefix, value is {@link BindingFactory}.
040         */
041        private Map _factoryMap = new HashMap();
042    
043        public void initializeService()
044        {
045            Iterator i = _contributions.iterator();
046    
047            while (i.hasNext())
048            {
049                BindingPrefixContribution c = (BindingPrefixContribution) i.next();
050    
051                _factoryMap.put(c.getPrefix(), c.getFactory());
052            }
053        }
054    
055        public IBinding createBinding(IComponent component, String bindingDescription,
056                String reference, String defaultPrefix, Location location)
057        {
058            String prefix = defaultPrefix;
059            String path = reference;
060    
061            int colonx = reference.indexOf(':');
062    
063            if (colonx > 1)
064            {
065                String pathPrefix = reference.substring(0, colonx);
066    
067                if (_factoryMap.containsKey(pathPrefix))
068                {
069                    prefix = pathPrefix;
070    
071                    path = reference.substring(colonx + 1);
072                }
073            }
074    
075            BindingFactory factory = (BindingFactory) _factoryMap.get(prefix);
076    
077            return factory.createBinding(component, bindingDescription, path, location);
078        }
079    
080        public void setContributions(List contributions)
081        {
082            _contributions = contributions;
083        }
084    }