de.softmetz.commons.ddd.shared.vo.AbstractCompoundValueObject.java Source code

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Here is the source code for de.softmetz.commons.ddd.shared.vo.AbstractCompoundValueObject.java

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/*
 *  commons-ddd is a set of Java classes for use in Domain Driven Design.
 *  Copyright (C) 2013  Christian Kalkhoff <softmetz@fsfe.org>
 *
 *  This file is part of commons-ddd.
 *
 *  commons-ddd is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  commons-ddd is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with commons-ddd.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.softmetz.commons.ddd.shared.vo;

import java.lang.reflect.ParameterizedType;
import javax.persistence.MappedSuperclass;
import javax.persistence.Transient;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

/**
 * Abstract base class for value objects that have more than one attribute.
 *
 * See {@link AbstractSingleValueObject} for a base class that is optimized for a single attribute.
 *
 * @param <VO> Type of the concrete implementation class
 * @author softmetz
 */
@MappedSuperclass
public abstract class AbstractCompoundValueObject<VO extends AbstractCompoundValueObject>
        extends AbstractValueObject<VO> {

    @Transient
    private final Class<VO> _CONCRETE_CLASS;

    /**
     * Constructor for this value object.
     *
     * Provided for convenience to create known values.
     *
     */
    protected AbstractCompoundValueObject() {
        _CONCRETE_CLASS = (Class<VO>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    @Override
    public boolean sameValueAs(VO other) {
        if (other == null) {
            return false;
        }
        return EqualsBuilder.reflectionEquals(this, other, false, _CONCRETE_CLASS);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!getClass().isAssignableFrom(obj.getClass())) {
            return false;
        }
        return sameValueAs((VO) obj);
    }

    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(7, 31, (VO) this, false, _CONCRETE_CLASS);
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString((VO) this, ToStringStyle.DEFAULT_STYLE, false, _CONCRETE_CLASS);
    }
}