/*
 * 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.logging.Level;
import java.util.logging.Logger;

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

/**
 * Robust identifiable provides robustness for identifiable objects.
 * 
 * @author Erik Brakkee
 * 
 * @param <T>
 */
public class RobustIdentifiable<T> implements Identifiable<T> {
    private static final Logger LOGGER = Logger
        .getLogger(RobustIdentifiable.class.getName());

    private Id<T> id;

    // TODO test this class.
    // TODO test that id is constant even though delegated changes its id.

    public RobustIdentifiable(String aPrefix, Identifiable<T> aIdentifiable) {
        notNull("prefix", aPrefix);
        notNull("identifiable", aIdentifiable);
        // TODO test id is null
        // TODO getId() throws exception
        try {
            id = aIdentifiable.getId();
            if (id == null) {
                throwConfigException("identifiable.getId() returned null", null);
            }
            id = new Id<T>(aPrefix + id.getId());
        } catch (Exception e) {
            throwConfigException("identifiable.getId() threw exception", e);
        }

    }

    private void throwConfigException(String aMsg, Exception aException) {
        LOGGER.log(Level.WARNING, aMsg, aException);
        throw new ConfigException("id is null");
    }

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

    // TODO test equals, hashcode.

    @Override
    public int hashCode() {
        return id.hashCode();
    }

    @Override
    public boolean equals(Object aObj) {
        if (aObj == null) {
            return false;
        }
        if (!getClass().isInstance(aObj)) {
            return false;
        }
        RobustIdentifiable<T> obj = (RobustIdentifiable<T>) aObj;
        return id.equals(obj.getId());
    }
}