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
015package org.apache.tapestry5.internal.bindings;
016
017import org.apache.tapestry5.Binding;
018import org.apache.tapestry5.ComponentResources;
019import org.apache.tapestry5.FieldTranslator;
020import org.apache.tapestry5.commons.Location;
021import org.apache.tapestry5.commons.internal.services.StringInterner;
022import org.apache.tapestry5.services.BindingFactory;
023import 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 */
029public 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}