/*
 * 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.onlab.onos.net.intent;

import org.onlab.onos.net.flow.BatchOperationTarget;

/**
 * Intent identifier suitable as an external key.
 * <p/>
 * This class is immutable.
 */
public final class IntentId implements BatchOperationTarget {

    private final long fingerprint;

    /**
     * Creates an intent identifier from the specified string representation.
     *
     * @param fingerprint long value
     * @return intent identifier
     */
    public static IntentId valueOf(long fingerprint) {
        return new IntentId(fingerprint);
    }

    /**
     * Constructor for serializer.
     */
    IntentId() {
        this.fingerprint = 0;
    }

    /**
     * Constructs the ID corresponding to a given long value.
     *
     * @param fingerprint the underlying value of this ID
     */
    IntentId(long fingerprint) {
        this.fingerprint = fingerprint;
    }

    @Override
    public int hashCode() {
        return (int) (fingerprint ^ (fingerprint >>> 32));
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof IntentId)) {
            return false;
        }
        IntentId that = (IntentId) obj;
        return this.fingerprint == that.fingerprint;
    }

    @Override
    public String toString() {
        return "0x" + Long.toHexString(fingerprint);
    }

}