Response.java

/**
 * Copyright 2005-2014 Restlet
 * 
 * The contents of this file are subject to the terms of one of the following
 * open source licenses: Apache 2.0 or LGPL 3.0 or LGPL 2.1 or CDDL 1.0 or EPL
 * 1.0 (the "Licenses"). You can select the license that you prefer but you may
 * not use this file except in compliance with one of these Licenses.
 * 
 * You can obtain a copy of the Apache 2.0 license at
 * http://www.opensource.org/licenses/apache-2.0
 * 
 * You can obtain a copy of the LGPL 3.0 license at
 * http://www.opensource.org/licenses/lgpl-3.0
 * 
 * You can obtain a copy of the LGPL 2.1 license at
 * http://www.opensource.org/licenses/lgpl-2.1
 * 
 * You can obtain a copy of the CDDL 1.0 license at
 * http://www.opensource.org/licenses/cddl1
 * 
 * You can obtain a copy of the EPL 1.0 license at
 * http://www.opensource.org/licenses/eclipse-1.0
 * 
 * See the Licenses for the specific language governing permissions and
 * limitations under the Licenses.
 * 
 * Alternatively, you can obtain a royalty free commercial license with less
 * limitations, transferable or non-transferable, directly at
 * http://www.restlet.com/products/restlet-framework
 * 
 * Restlet is a registered trademark of Restlet
 */

package org.restlet;

import org.restlet.data.CookieSetting;
import org.restlet.util.Series;


/**
 * Generic response sent by server connectors. It is then received by client
 * connectors. Responses are uniform across all types of connectors, protocols
 * and components.
 * 
 * @see org.restlet.Request
 * @see org.restlet.Uniform
 * @author Jerome Louvel
 */
public class Response extends Message {

    /** The cookie settings provided by the server. */
    private volatile Series<CookieSetting> cookieSettings;

    /**
     * Constructor.
     * 
     * @param request
     *            The request associated to this response.
     */
    public Response(Request request) {
        this.cookieSettings = null;
    }

    /**
     * Returns the modifiable series of cookie settings provided by the server.
     * Creates a new instance if no one has been set.<br>
     * <br>
     * Note that when used with HTTP connectors, this property maps to the
     * "Set-Cookie" and "Set-Cookie2" headers.
     * 
     * @return The cookie settings provided by the server.
     */
    public Series<CookieSetting> getCookieSettings() {
        // Lazy initialization with double-check.
        Series<CookieSetting> c = this.cookieSettings;
        if (c == null) {
            synchronized (this) {
                c = this.cookieSettings;
                if (c == null) {
                    this.cookieSettings = c = new Series<CookieSetting>(
                            CookieSetting.class);
                }
            }
        }
        return c;
    }
}