/**

  * Copyright (c) 2008-2012, http://www.snakeyaml.org

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.yaml.snakeyaml.nodes;

 /**

  * Stores one key value pair used in a map.

  */

 public final class NodeTuple {

     private Node keyNode;

     private Node valueNode;

     public NodeTuple(Node keyNode, Node valueNode) {

         if (keyNode == null || valueNode == null) {

             throw new NullPointerException("Nodes must be provided.");

         }

         this.keyNode = keyNode;

         this.valueNode = valueNode;

     }

     /**

      * Key node.

      */

     final public Node getKeyNode() {

         return keyNode;

     }

     /**

      * Value node.

      * 

      * @return value

      */

     final public Node getValueNode() {

         return valueNode;

     }

     @Override

     public String toString() {

         return "<NodeTuple keyNode=" + keyNode.toString() + "; valueNode=" + valueNode.toString()

                 + ">";

     }

 }