/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions copyright [year] [name of copyright owner]".
 *
 * Copyright 2014-2015 ForgeRock AS.
 */

package org.forgerock.openam.rest;

import org.forgerock.services.context.Context;
import org.forgerock.openam.rest.RealmContext;

/**
 * Resource capable of determining a realm from a Context.
 *
 * @since 12.0.0
 */
public abstract class RealmAwareResource extends SubjectAwareResource {

    protected final String EMPTY = "";
    protected final String ROOT = "/";

    /**
     * Retrieves the Realm from a provided {@link org.forgerock.http.Context}.
     *
     * Returns null if there's no RealmContext in the provided Context.
     *
     * @param context The request context.
     * @return a String containing the name of the realm associated with this request,
     *  or null if there is no RealmContext in the Context.
     */
    protected String getRealm(Context context) {

        if (!context.containsContext(RealmContext.class)) {
            return null;
        }

        final RealmContext rc = context.asContext(RealmContext.class);

        if (rc.getResolvedRealm().equals(EMPTY)) {
            return ROOT;
        }

        return rc.getResolvedRealm();
    }

}
