/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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* Portions Copyright 2014-2015 ForgeRock AS.
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*/
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package org.opends.server.backends.pluggable;
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import org.forgerock.opendj.ldap.ByteString;
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/**
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* An integer identifier assigned to each entry in the backend.
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* An entry ID is implemented by this class as a long.
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* There are static methods to assign monotonically increasing entry IDs,
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* starting from 1.
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*/
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class EntryID implements Comparable<EntryID>
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{
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/** The identifier integer value. */
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private final long id;
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/** The value in tree format, created when necessary. */
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private ByteString value;
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/**
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* Create a new entry ID object from a given long value.
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* @param id The long value of the ID.
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*/
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EntryID(long id)
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{
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this.id = id;
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}
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/**
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* Create a new entry ID object from a value in tree format.
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* @param value The tree value of the ID.
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*/
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EntryID(ByteString value)
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{
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this.value = value;
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id = value.toLong();
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}
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/**
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* Get the value of the entry ID as a long.
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* @return The entry ID.
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*/
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long longValue()
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{
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return id;
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}
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/**
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* Get the value of the ID in tree format.
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* @return The value of the ID in tree format.
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*/
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ByteString toByteString()
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{
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if (value == null)
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{
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value = ByteString.valueOfLong(id);
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}
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return value;
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}
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/**
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* Compares this object with the specified object for order. Returns a
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* negative integer, zero, or a positive integer as this object is less
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* than, equal to, or greater than the specified object.<p>
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* <p/>
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*
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* @param that the Object to be compared.
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* @return a negative integer, zero, or a positive integer as this object
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* is less than, equal to, or greater than the specified object.
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* @throws ClassCastException if the specified object's type prevents it
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* from being compared to this Object.
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*/
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@Override
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public int compareTo(EntryID that) throws ClassCastException
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{
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final long result = this.id - that.id;
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if (result < 0)
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{
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return -1;
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}
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else if (result > 0)
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{
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return 1;
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}
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return 0;
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}
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/**
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* Indicates whether some other object is "equal to" this one.
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*
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* @param that the reference object with which to compare.
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* @return <code>true</code> if this object is the same as the obj
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* argument; <code>false</code> otherwise.
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* @see #hashCode()
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* @see java.util.Hashtable
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*/
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@Override
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public boolean equals(Object that)
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{
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if (this == that)
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{
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return true;
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}
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if (!(that instanceof EntryID))
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{
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return false;
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}
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return this.id == ((EntryID) that).id;
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}
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/**
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* Returns a hash code value for the object. This method is
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* supported for the benefit of hashtables such as those provided by
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* <code>java.util.Hashtable</code>.
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*
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* @return a hash code value for this object.
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* @see java.lang.Object#equals(java.lang.Object)
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* @see java.util.Hashtable
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*/
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@Override
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public int hashCode()
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{
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return (int) id;
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}
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/**
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* Get a string representation of this object.
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* @return A string representation of this object.
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*/
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@Override
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public String toString()
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{
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return Long.toString(id);
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}
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}
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