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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ---------------------------------------------------------------------
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.common;

import javax.annotation.Nonnull;

/**
 * User: serso
 * Date: 4/29/12
 * Time: 9:47 PM
 */
final class VersionedEntityImpl implements VersionedEntity {

	@Nonnull
	private I id;

	@Nonnull
	private Integer version = FIRST_VERSION;

	VersionedEntityImpl(@Nonnull I id) {
		this.id = id;
	}

	VersionedEntityImpl(@Nonnull I id, @Nonnull Integer version) {
		this.id = id;
		this.version = version;
	}

	VersionedEntityImpl(@Nonnull VersionedEntity versionedEntity) {
		this.id = versionedEntity.getId();
		this.version = versionedEntity.getVersion();
	}

	@Nonnull
	static  VersionedEntity newVersion(@Nonnull VersionedEntity versionedEntity) {
		return new VersionedEntityImpl(versionedEntity.getId(), versionedEntity.getVersion() + 1);
	}

	@Nonnull
	@Override
	public I getId() {
		return this.id;
	}

	@Nonnull
	@Override
	public Integer getVersion() {
		return version;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (!(o instanceof VersionedEntityImpl)) {
			return false;
		}

		VersionedEntityImpl that = (VersionedEntityImpl) o;

		if (!id.equals(that.id)) {
			return false;
		}

		return true;
	}

	@Override
	public boolean equalsVersion(Object that) {
		return this.equals(that) && this.version.equals(((VersionedEntityImpl) that).version);
	}

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

	@Override
	public String toString() {
		return "VersionedEntityImpl{" +
				"id=" + id +
				", version=" + version +
				'}';
	}

	@Nonnull
	@Override
	public VersionedEntityImpl clone() {
		final VersionedEntityImpl clone;

		try {
			//noinspection unchecked
			clone = (VersionedEntityImpl) super.clone();
		} catch (CloneNotSupportedException e) {
			throw new AssertionError(e);
		}

		return clone;
	}
}