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Contains common utility code, reusable outside Hudson.

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/*******************************************************************************
 *
 * Copyright (c) 2010-2011 Sonatype, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: 
 *
 *   
 *     
 *
 *******************************************************************************/ 

package org.hudsonci.utils.id;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Long-based identifier.
 *
 * @author Jason Dillon
 * @since 2.1.0
 */
@XStreamAlias("longid")
public class LongID
    implements ID
{
    @XStreamAsAttribute
    private final long value;

    public LongID(final long value) {
        this.value = value;
    }

    public LongID(final Number value) {
        this.value = checkNotNull(value.longValue());
    }

    public LongID(final String value) {
        this(Long.parseLong(value));
    }

    public long getValue() {
        return value;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof LongID)) {
            return false;
        }

        LongID that = (LongID) obj;

        return value == that.value;
    }

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

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