001// Copyright 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
015package org.apache.tapestry.pageload;
016
017import org.apache.tapestry.INamespace;
018import org.apache.tapestry.services.ClassFinder;
019
020/**
021 * Searches for a class with a name matching the page name. Searches in the default Java package,
022 * and possibly additional packages defined as meta-data within the namespace.
023 * 
024 * @author Howard M. Lewis Ship
025 * @since 4.0
026 */
027public class NamespaceClassSearchComponentClassProvider implements ComponentClassProvider
028{
029    /**
030     * Property, defined as meta data of the containing namespace, that defines a comma-seperated
031     * list of packages to search for page or component classes within.
032     */
033    private String _packagesName;
034
035    private ClassFinder _classFinder;
036
037    public String provideComponentClassName(ComponentClassProviderContext context)
038    {
039        INamespace namespace = context.getNamespace();
040        String packages = namespace.getPropertyValue(_packagesName);
041
042        String componentClassName = context.getName().replace('/', '.');
043
044        Class clazz = _classFinder.findClass(packages, componentClassName);
045
046        return clazz == null ? null : clazz.getName();
047    }
048
049    public void setPackagesName(String packagesName)
050    {
051        _packagesName = packagesName;
052    }
053
054    public void setClassFinder(ClassFinder classFinder)
055    {
056        _classFinder = classFinder;
057    }
058}