org.mvel2.integration.PropertyHandlerFactory Maven / Gradle / Ivy

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.integration;

import java.util.HashMap;
import java.util.Map;

public class PropertyHandlerFactory {

    protected static Map propertyHandlerClass = new HashMap();

    protected static PropertyHandler nullPropertyHandler;
    protected static PropertyHandler nullMethodHandler;

    public static PropertyHandler getPropertyHandler(Class clazz) {
        return propertyHandlerClass.get(clazz);
    }

    public static boolean hasPropertyHandler(Class clazz) {
        if (clazz == null) return false;
        if (!propertyHandlerClass.containsKey(clazz)) {
            Class clazzWalk = clazz;
            do {
                if (clazz != clazzWalk && propertyHandlerClass.containsKey(clazzWalk)) {
                    propertyHandlerClass.put(clazz, propertyHandlerClass.get(clazzWalk));
                    return true;
                }
                for (Class c : clazzWalk.getInterfaces()) {
                    if (propertyHandlerClass.containsKey(c)) {
                        propertyHandlerClass.put(clazz, propertyHandlerClass.get(c));
                        return true;
                    }
                }
            } while ((clazzWalk = clazzWalk.getSuperclass()) != null && clazzWalk != Object.class);
            return false;
        } else {
            return true;
        }
    }

    public static void registerPropertyHandler(Class clazz, PropertyHandler propertyHandler) {
        propertyHandlerClass.put(clazz, propertyHandler);
    }

    public static boolean hasNullPropertyHandler() {
        return nullPropertyHandler != null;
    }

    public static PropertyHandler getNullPropertyHandler() {
        return nullPropertyHandler;
    }

    public static void setNullPropertyHandler(PropertyHandler handler) {
        nullPropertyHandler = handler;
    }

    public static boolean hasNullMethodHandler() {
        return nullMethodHandler != null;
    }

    public static PropertyHandler getNullMethodHandler() {
        return nullMethodHandler;
    }

    public static void setNullMethodHandler(PropertyHandler handler) {
        nullMethodHandler = handler;
    }

    public static void unregisterPropertyHandler(Class clazz) {
        propertyHandlerClass.remove(clazz);
    }

    public static void disposeAll() {
        nullMethodHandler = null;
        nullPropertyHandler = null;
        propertyHandlerClass.clear();
    }
}