/**

  * Copyright (c) 2014-2016, stateful.co

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) Redistributions in binary form must reproduce the above

  * copyright notice, this list of conditions and the following

  * disclaimer in the documentation and/or other materials provided

  * with the distribution. 3) Neither the name of the stateful.co nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

  * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 package co.stateful;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.http.Request;

 import com.jcabi.http.response.RestResponse;

 import com.jcabi.http.response.XmlResponse;

 import java.io.IOException;

 import java.net.HttpURLConnection;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Locks.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id$

  * @since 0.2

  * @checkstyle MultipleStringLiteralsCheck (500 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @ToString(of = { })

 @EqualsAndHashCode(of = "request")

 final class RtLocks implements Locks {

     /**

      * Entry response.

      */

     private final transient Request request;

     /**

      * Ctor.

      * @param req Request

      */

     RtLocks(final Request req) {

         this.request = req;

     }

     @Override

     public boolean exists(final String name) throws IOException {

         return !this.request

             .fetch()

             .as(RestResponse.class)

             .assertStatus(HttpURLConnection.HTTP_OK)

             .as(XmlResponse.class)

             .rel("/page/links/link[@rel='self']/@href")

             .method(Request.GET)

             .fetch()

             .as(XmlResponse.class)

             .xml()

             .nodes(String.format("/page/locks/lock[name='%s']", name))

             .isEmpty();

     }

     @Override

     public Lock get(final String name) {

         return new RtLock(name, this.request);

     }

 }