jp.tricreo.ddd.base.model.impl.AbstractEntity.java Source code

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Here is the source code for jp.tricreo.ddd.base.model.impl.AbstractEntity.java

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/*
 * Copyright 2010 TRICREO, Inc. (http://tricreo.jp/)
 *
 * 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 jp.tricreo.ddd.base.model.impl;

import jp.tricreo.ddd.base.model.Entity;
import jp.tricreo.ddd.base.model.Identifier;

import org.apache.commons.lang.Validate;

/**
 * {@link Entity}?
 *
 * @author j5ik2o
 */
public abstract class AbstractEntity implements Entity {

    private final Identifier identifier;

    /**
     * ??
     *
     * @param identifier {@link Identifier}
     */
    protected AbstractEntity(Identifier identifier) {
        Validate.notNull(identifier);
        this.identifier = identifier;
    }

    @Override
    public AbstractEntity clone() {
        try {
            return (AbstractEntity) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new Error("clone not supported");
        }
    }

    @Override
    public boolean equals(Object that) {
        if (this == that) {
            return true;
        }
        if (that == null || that instanceof Entity == false) {
            return false;
        }
        return identifier.equals(((AbstractEntity) that).getIdentifier());
    }

    @Override
    public Identifier getIdentifier() {
        return identifier;
    }

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