/*
 * 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 static org.wamblee.xmlrouter.impl.MessageUtil.*;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

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

/**
 * Composite config. The composite config
 * 
 * @author Erik Brakkee
 * 
 * @param <T>
 */
public class CompositeConfig<T extends Identifiable<T>> implements
    ExtendedConfig<T> {

    private static final Id<Config> ID = new Id<Config>("compositeconfig");
    private static final String READ_ONLY_INSTANCE = "read only instance";
    private Set<Id<Config>> ids;
    private List<Id<T>> valueIds;
    private List<T> values;

    public CompositeConfig() {
        ids = new HashSet<Id<Config>>();
        valueIds = new ArrayList<Id<T>>();
        values = new ArrayList<T>();
    }

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

    public void addConfig(Config<T> aConfig) {
        notNull("aConfig", aConfig);
        if (ids.contains(aConfig.getId())) {
            throw new ConfigException("duplicate id '" +
                aConfig.getId().toString() + "'");
        }
        for (T item : aConfig.values()) {
            if (valueIds.contains(item.getId())) {
                throw new ConfigException("duplicate id '" +
                    item.getId().toString() + "'");
            }
        }

        ids.add(aConfig.getId());
        for (T item : aConfig.values()) {
            valueIds.add(item.getId());
            values.add(item);
        }
    }

    @Override
    public List<T> values() {
        return values;
    }

    @Override
    public boolean remove(Id<T> aId) {
        notSupported(READ_ONLY_INSTANCE);
        return false;
    }

    @Override
    public void add(T aT) {
        notSupported(READ_ONLY_INSTANCE);
    }
}