org.apache.openaz.pepapi.std.StdMapperRegistry.java Source code

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Here is the source code for org.apache.openaz.pepapi.std.StdMapperRegistry.java

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.openaz.pepapi.std;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.openaz.pepapi.*;

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

public final class StdMapperRegistry implements MapperRegistry {

    private static final Log logger = LogFactory.getLog(StdMapperRegistry.class);

    private final Map<Class<?>, ObjectMapper> map;

    private PepConfig pepConfig;

    private StdMapperRegistry(PepConfig pepConfig) {
        // Register defaults.
        this.pepConfig = pepConfig;
        map = new HashMap<Class<?>, ObjectMapper>();
        registerMapper(new CollectionMapper());
        registerMapper(new ArrayMapper());
        registerMapper(new SubjectMapper());
        registerMapper(new ActionMapper());
        registerMapper(new ResourceMapper());
        registerMapper(new CategoryContainerMapper(Environment.class));
        registerMapper(new CategoryContainerMapper(CategoryContainer.class));
        registerMapper(new ActionResourcePairMapper());
    }

    public static MapperRegistry newInstance(PepConfig pepConfig) {
        return new StdMapperRegistry(pepConfig);
    }

    public static MapperRegistry newInstance(PepConfig pepConfig, List<ObjectMapper> mappers) {
        MapperRegistry mapperRegistry = newInstance(pepConfig);
        if (mappers != null) {
            mapperRegistry.registerMappers(mappers);
        }
        return mapperRegistry;
    }

    @Override
    public void registerMapper(ObjectMapper mapper) {
        mapper.setPepConfig(pepConfig);
        mapper.setMapperRegistry(this);
        map.put(mapper.getMappedClass(), mapper);
    }

    @Override
    public void registerMappers(Iterable<? extends ObjectMapper> mappers) {
        for (ObjectMapper mapper : mappers) {
            registerMapper(mapper);
        }
    }

    @Override
    public ObjectMapper getMapper(Class<?> clazz) {
        ObjectMapper mapper = null;
        Class<?> c = clazz;
        while (mapper == null && !c.equals(Object.class)) {
            mapper = getClassMapper(c);
            c = c.getSuperclass();
        }

        // Handle Arrays.
        if (mapper == null && clazz.isArray()) {
            mapper = getMapper(Object[].class);
        }

        if (mapper != null) {
            logger.debug("Mapper :" + mapper.getClass().getName() + " found for class: " + clazz);
            return mapper;
        } else {
            throw new PepException("No ObjectMapper found for Object of Class: " + clazz);
        }
    }

    private ObjectMapper getClassMapper(Class<?> clazz) {
        ObjectMapper mapper = map.get(clazz);
        if (mapper == null) {
            Class<?>[] interfaces = clazz.getInterfaces();
            if (interfaces != null && interfaces.length > 0) {
                for (Class<?> inf : interfaces) {
                    mapper = map.get(inf);
                    if (mapper != null) {
                        break;
                    }
                }
            }
        }
        return mapper;
    }
}