/**

  * Copyright (c) 2013-2017, xembly.org

  * 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 xembly.org 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 org.xembly;

 import java.util.ArrayList;

 import java.util.Collection;

 import lombok.EqualsAndHashCode;

 import org.w3c.dom.Document;

 import org.w3c.dom.Node;

 import org.w3c.dom.NodeList;

 /**

  * ADDIF directive.

  *

  * <p>The class is immutable and thread-safe.

  *

  * @author Yegor Bugayenko (yegor256@gmail.com)

  * @version $Id: 8887586b14ec41e558140626669b6da5fba07c6e $

  * @since 0.1

  */

 @EqualsAndHashCode(of = "name")

 final class AddIfDirective implements Directive {

     /**

      * Name of node to add.

      */

     private final transient Arg name;

     /**

      * Public ctor.

      * @param node Name of node to add

      * @throws XmlContentException If invalid input

      */

     AddIfDirective(final String node) throws XmlContentException {

         this.name = new Arg(node);

     }

     @Override

     public String toString() {

         return String.format("ADDIF %s", this.name);

     }

     @Override

     public Directive.Cursor exec(final Node dom,

         final Directive.Cursor cursor, final Directive.Stack stack) {

         final Collection<Node> targets = new ArrayList<Node>(cursor.size());

         final String label = this.name.raw();

         for (final Node node : cursor) {

             final NodeList kids = node.getChildNodes();

             Node target = null;

             final int len = kids.getLength();

             for (int idx = 0; idx < len; ++idx) {

                 if (kids.item(idx).getNodeName()

                     .compareToIgnoreCase(label) == 0) {

                     target = kids.item(idx);

                     break;

                 }

             }

             if (target == null) {

                 final Document doc;

                 if (dom.getOwnerDocument() == null) {

                     doc = Document.class.cast(dom);

                 } else {

                     doc = dom.getOwnerDocument();

                 }

                 target = doc.createElement(this.name.raw());

                 node.appendChild(target);

             }

             targets.add(target);

         }

         return new DomCursor(targets);

     }

 }