001    // Copyright 2007, 2008, 2009 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.bindings;
016    
017    import org.apache.tapestry5.Binding;
018    import org.apache.tapestry5.ComponentResources;
019    import org.apache.tapestry5.FieldTranslator;
020    import org.apache.tapestry5.internal.services.StringInterner;
021    import org.apache.tapestry5.ioc.Location;
022    import org.apache.tapestry5.services.BindingFactory;
023    import org.apache.tapestry5.services.FieldTranslatorSource;
024    
025    /**
026     * Interprets the binding expression as the name of a {@link org.apache.tapestry5.Translator} provided by the {@link
027     * org.apache.tapestry5.services.TranslatorSource}.
028     */
029    public class TranslateBindingFactory implements BindingFactory
030    {
031        private final FieldTranslatorSource source;
032    
033        private final StringInterner interner;
034    
035        public TranslateBindingFactory(FieldTranslatorSource source, StringInterner interner)
036        {
037            this.source = source;
038            this.interner = interner;
039        }
040    
041        public Binding newBinding(String description, ComponentResources container,
042                                  final ComponentResources component, final String expression, Location location)
043        {
044            return new InvariantBinding(location, FieldTranslator.class, interner.intern(description + ": " + expression))
045            {
046                public Object get()
047                {
048                    return source.createTranslator(component, expression);
049                }
050            };
051        }
052    }