/**

  * 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.Collection;

 import java.util.HashSet;

 import lombok.EqualsAndHashCode;

 import org.w3c.dom.Attr;

 import org.w3c.dom.Element;

 import org.w3c.dom.Node;

 /**

  * REMOVE directive.

  *

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

  *

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

  * @version $Id: f6a560fa77336e306b7b76d5a7b10e651f4267e4 $

  * @since 0.2

  */

 @EqualsAndHashCode

 final class RemoveDirective implements Directive {

     @Override

     public String toString() {

         return "REMOVE";

     }

     @Override

     public Directive.Cursor exec(final Node dom,

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

         final Collection<Node> parents = new HashSet<Node>(cursor.size());

         for (final Node node : cursor) {

             final Node parent;

             if (node.getNodeType() == Node.ATTRIBUTE_NODE) {

                 final Attr attr = Attr.class.cast(node);

                 parent = attr.getOwnerElement();

                 Element.class.cast(parent).removeAttributeNode(attr);

             } else {

                 parent = node.getParentNode();

                 if (parent == null) {

                     throw new IllegalArgumentException(

                         "you can't delete root document element form XML"

                     );

                 }

                 parent.removeChild(node);

             }

             parents.add(parent);

         }

         return new DomCursor(parents);

     }

 }