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    1   /*
    2    * Copyright 2002-2006 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.jexl.parser;
    17
    18  import org.apache.commons.jexl.JexlContext;
    19  import org.apache.commons.jexl.util.Coercion;
    20
    21  /***
    22   * Not equal to. Use '!=' or 'ne', do not use <>.
    23   *
    24   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    25   * @version $Id: ASTNENode.java 398270 2006-04-30 03:02:58Z dion $
    26   */
    27  public class ASTNENode extends SimpleNode {
    28      /***
    29       * Create the node given an id.
    30       *
    31       * @param id node id.
    32       */
    33      public ASTNENode(int id) {
    34          super(id);
    35      }
    36
    37      /***
    38       * Create a node with the given parser and id.
    39       *
    40       * @param p a parser.
    41       * @param id node id.
    42       */
    43      public ASTNENode(Parser p, int id) {
    44          super(p, id);
    45      }
    46
    47      /*** {@inheritDoc} */
    48      public Object jjtAccept(ParserVisitor visitor, Object data) {
    49          return visitor.visit(this, data);
    50      }
    51
    52      /*** {@inheritDoc} */
    53      public Object value(JexlContext pc) throws Exception {
    54          Object left = ((SimpleNode) jjtGetChild(0)).value(pc);
    55          Object right = ((SimpleNode) jjtGetChild(1)).value(pc);
    56
    57          if (left == null && right == null) {
    58              /*
    59               * first, the possibility that both *are* null
    60               */
    61
    62              return Boolean.FALSE;
    63          } else if (left == null || right == null) {
    64              /*
    65               * otherwise, both aren't, so it's clear L != R
    66               */
    67              return Boolean.TRUE;
    68          } else if (left.getClass().equals(right.getClass())) {
    69              return (left.equals(right)) ? Boolean.FALSE : Boolean.TRUE;
    70          } else if (left instanceof Float
    71              || left instanceof Double
    72              || right instanceof Float
    73              || right instanceof Double) {
    74              return (Coercion.coerceDouble(left).equals(Coercion.coerceDouble(right))) ? Boolean.FALSE : Boolean.TRUE;
    75          } else if (left instanceof Number || right instanceof Number || left instanceof Character
    76              || right instanceof Character) {
    77              return (Coercion.coerceLong(left).equals(Coercion.coerceLong(right))) ? Boolean.FALSE : Boolean.TRUE;
    78          } else if (left instanceof Boolean || right instanceof Boolean) {
    79              return (Coercion.coerceBoolean(left).equals(Coercion.coerceBoolean(right))) ? Boolean.FALSE : Boolean.TRUE;
    80          } else if (left instanceof java.lang.String || right instanceof String) {
    81              return (left.toString().equals(right.toString())) ? Boolean.FALSE : Boolean.TRUE;
    82          }
    83
    84          return (left.equals(right)) ? Boolean.FALSE : Boolean.TRUE;
    85      }
    86  }