/*
 * 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.Collections;
import java.util.Iterator;
import java.util.List;

import org.wamblee.xmlrouter.common.Id;
import org.wamblee.xmlrouter.config.Config;
import org.wamblee.xmlrouter.config.Identifiable;

/**
 * Default implementation of the {@link Config} interface.
 * 
 * @author Erik Brakkee
 * 
 * @param <T>
 */
public abstract class ConfigImpl<T extends Identifiable> implements
    ExtendedConfig<T> {

    private Id<Config> id;
    private List<T> registered;

    /**
     * Constructs the object.
     */
    public ConfigImpl(Id<Config> aId) {
        // TODO test for null.
        id = aId;
        registered = new ArrayList<T>();
    }

    @Override
    public Id<Config> getId() {
        return id;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.xmlrouter.config.Config#add(T)
     */
    @Override
    public synchronized void add(T aT) {
        // TODO test duplicate ids.
        notNull(aT);
        registered.add(wrap(aT));
    }

    /**
     * This is called to wrap the given object by a safer version.
     * 
     * @param aT
     *            Object to wrap.
     * @return Wrapped object.
     */
    public abstract T wrap(T aT);

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.wamblee.xmlrouter.config.Config#remove(org.wamblee.xmlrouter.common
     * .Id)
     */
    @Override
    public synchronized boolean remove(Id<T> aId) {
        notNull(aId);
        Iterator<T> i = registered.iterator();
        while (i.hasNext()) {
            T t = i.next();
            if (t.getId().equals(aId)) {
                i.remove();
                return true;
            }
        }
        return false;
    }

    @Override
    public List<T> values() {
        return Collections.unmodifiableList(registered);
    }

    private void notNull(T aT) {
        if (aT == null) {
            throw new NullPointerException("Object is null");
        }
    }

    private void notNull(Id<T> aId) {
        if (aId == null) {
            throw new NullPointerException("Id is null");
        }
    }
}