    001// Copyright 2007, 2008, 2012 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.services;
    016
    017import org.apache.tapestry5.ioc.services.PropertyAdapter;
    018import org.apache.tapestry5.ioc.util.StrategyRegistry;
    019import org.apache.tapestry5.services.DataTypeAnalyzer;
    020import org.apache.tapestry5.services.InvalidationListener;
    021
    022import java.util.Map;
    023
    024/**
    025 * The default data type analyzer, which is based entirely on the type of the property (and not on annotations or naming
    026 * conventions). This is based on a configuration of property type class to string provided as an IoC service
    027 * configuration.
    028 */
    029public class DefaultDataTypeAnalyzer implements DataTypeAnalyzer, Runnable
    030{
    031    private final StrategyRegistry<String> registry;
    032
    033    public DefaultDataTypeAnalyzer(Map<Class, String> configuration)
    034    {
    035        registry = StrategyRegistry.newInstance(String.class, configuration);
    036    }
    037
    038    /**
    039     * Clears the registry on an invalidation event (this is because the registry caches results, and the keys are
    040     * classes that may be component classes from the invalidated component class loader).
    041     */
    042    public void run()
    043    {
    044        registry.clearCache();
    045    }
    046
    047    public String identifyDataType(PropertyAdapter adapter)
    048    {
    049        Class propertyType = adapter.getType();
    050
    051        String dataType = registry.get(propertyType);
    052
    053        // To avoid "no strategy" exceptions, we expect a contribution of Object.class to the empty
    054        // string. We convert that back to a null.
    055
    056        if (dataType.equals(""))
    057            return null;
    058
    059        return dataType;
    060    }
    061}