/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2009 Sun Microsystems, Inc.
 */

package org.forgerock.opendj.ldap.schema;

/**
 * This enumeration defines the set of possible attribute usage values that may
 * apply to an attribute type, as defined in RFC 2252.
 *
 * @see <a href="http://tools.ietf.org/html/rfc2252">RFC 2252 - Lightweight
 *      Directory Access Protocol (v3): Attribute Syntax Definitions</a>
 */
public enum AttributeUsage {
    /**
     * The attribute usage intended for user-defined attribute types.
     */
    USER_APPLICATIONS("userApplications", false),

    /**
     * The attribute usage intended for standard operational attributes.
     */
    DIRECTORY_OPERATION("directoryOperation", true),

    /**
     * The attribute usage intended for non-standard operational attributes
     * shared among multiple DSAs.
     */
    DISTRIBUTED_OPERATION("distributedOperation", true),

    /**
     * The attribute usage intended for non-standard operational attributes used
     * by a single DSA.
     */
    DSA_OPERATION("dSAOperation", true);

    // The string representation of this attribute usage.
    private final String usageString;

    // Flag indicating whether or not the usage should be categorized as
    // operational.
    private final boolean isOperational;

    /**
     * Creates a new attribute usage with the provided string representation.
     *
     * @param usageString
     *            The string representation of this attribute usage.
     * @param isOperational
     *            <code>true</code> if attributes having this attribute usage
     *            are operational, or <code>false</code> otherwise.
     */
    private AttributeUsage(final String usageString, final boolean isOperational) {
        this.usageString = usageString;
        this.isOperational = isOperational;
    }

    /**
     * Determine whether or not attributes having this attribute usage are
     * operational.
     *
     * @return Returns <code>true</code> if attributes having this attribute
     *         usage are operational, or <code>false</code> otherwise.
     */
    public boolean isOperational() {
        return isOperational;
    }

    /**
     * Retrieves a string representation of this attribute usage.
     *
     * @return A string representation of this attribute usage.
     */
    @Override
    public String toString() {
        return usageString;
    }
}