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Jodd Joy is set of Jodd extensions that makes development of web applications even easier.

There is a newer version: 5.3.0

// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.joy.db;

import jodd.util.HashCode;

import static jodd.util.HashCode.SEED;

/**
 * Abstract entity. It may be used when @DbId annotation is not used.
 */
public abstract class Entity implements DbEntity {

	/**
	 * {@inheritDoc}
	 */
	public boolean isPersistent() {
		return getEntityId() != 0;
	}

	/**
	 * {@inheritDoc}
	 */
	public void detach() {
		setEntityId(0);
	}

	// ---------------------------------------------------------------- equals

	@Override
	public int hashCode() {
		int hash = SEED;
		hash = HashCode.hash(hash, getEntityId());
		hash = HashCode.hash(hash, getClass());
		return hash;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o.getClass() != this.getClass()) {
			return false;
		}
		Entity entity = (Entity) o;

		if (getEntityId() == 0 && entity.getEntityId() == 0) {
			return this == o;
		}
		return getEntityId() == entity.getEntityId();
	}

	// ---------------------------------------------------------------- toString

	@Override
	public String toString() {
		return "Entity{" + this.getClass().getSimpleName() + ':' + getEntityId() + '}';
	}

}