/*
 * Copyright 2005-2011 the original author or authors.
 * 
 * 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.wamblee.xmlrouter.impl;

import java.util.ArrayList;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.wamblee.xmlrouter.common.Id;
import org.wamblee.xmlrouter.config.RouterConfig;

/**
 * Implements the XML Router configuration interface including the required
 * locking.
 * 
 * @author Erik Brakkee
 */
public class XMLRouterConfigurationImpl implements XMLRouterConfiguration {

    private final ReentrantReadWriteLock rwlock = new ReentrantReadWriteLock(
        true);
    private final ReentrantReadWriteLock.ReadLock rlock = rwlock.readLock();
    private final ReentrantReadWriteLock.WriteLock wlock = rwlock.writeLock();

    private ExtendedRouterConfig config;
    private TransformationPaths transformations;

    public XMLRouterConfigurationImpl(ExtendedRouterConfig aConfig) {
        config = aConfig;
        transformations = new TransformationPaths(config.transformationConfig()
            .values());
    }

    public XMLRouterConfigurationImpl() {
        this(new CompositeRouterConfig(new Id<RouterConfig>("routerconfig"),
            new ArrayList<RouterConfig>()));
    }

    @Override
    public void startPublishEvent() {
        rlock.lock();
    }

    @Override
    public void endPublishEvent() {
        rlock.unlock();
    }

    @Override
    public ExtendedRouterConfig getRouterConfig() {
        return config;
    }

    @Override
    public void setRouterConfig(ExtendedRouterConfig aConfig) {

        TransformationPaths newTransformations = new TransformationPaths(
            aConfig.transformationConfig().values());

        wlock.lock();
        try {
            config = aConfig;
            transformations = newTransformations;
        } finally {
            wlock.unlock();
        }
    }

    @Override
    public TransformationPaths getTransformations() {
        return transformations;
    }
}