/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.flink.api.java.typeutils.runtime;

import org.apache.hadoop.io.WritableComparable;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.UUID;

public class WritableID implements WritableComparable<WritableID> {
	private UUID uuid;

	public WritableID() {
		this.uuid = UUID.randomUUID();
	}

	public WritableID(UUID uuid) {
		this.uuid = uuid;
	}

	@Override
	public int compareTo(WritableID o) {
		return this.uuid.compareTo(o.uuid);
	}

	@Override
	public void write(DataOutput dataOutput) throws IOException {
		dataOutput.writeLong(uuid.getMostSignificantBits());
		dataOutput.writeLong(uuid.getLeastSignificantBits());
	}

	@Override
	public void readFields(DataInput dataInput) throws IOException {
		this.uuid = new UUID(dataInput.readLong(), dataInput.readLong());
	}

	@Override
	public String toString() {
		return uuid.toString();
	}

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

		WritableID id = (WritableID) o;

		return !(uuid != null ? !uuid.equals(id.uuid) : id.uuid != null);
	}

	@Override
	public int hashCode() {
		return uuid != null ? uuid.hashCode() : 0;
	}
}