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    
015    package org.apache.tapestry.pageload;
016    
017    import org.apache.tapestry.INamespace;
018    import 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     */
027    public 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    }