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    1   /*
    2    * Copyright 2002,2004 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   *  != or ne
    23   *
    24   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    25   *  @version $Id: ASTNENode.java,v 1.7 2004/08/22 01:53:27 dion Exp $
    26   */
    27  public class ASTNENode extends SimpleNode
    28  {
    29      public ASTNENode(int id)
    30      {
    31          super(id);
    32      }
    33
    34      public ASTNENode(Parser p, int id)
    35      {
    36          super(p, id);
    37      }
    38
    39
    40      /*** Accept the visitor. **/
    41      public Object jjtAccept(ParserVisitor visitor, Object data)
    42      {
    43          return visitor.visit(this, data);
    44      }
    45
    46      public Object value(JexlContext pc)
    47          throws Exception
    48      {
    49          Object left = ( (SimpleNode) jjtGetChild(0)).value(pc);
    50          Object right = ( (SimpleNode) jjtGetChild(1)).value(pc);
    51
    52          if (left==null && right==null)
    53          {
    54              /*
    55               * first, the possibility that both *are* null
    56               */
    57
    58              return Boolean.FALSE;
    59          }
    60          else if (left==null || right==null)
    61          {
    62              /*
    63               * otherwise, both aren't, so it's cleal L != R
    64               */
    65              return Boolean.TRUE;
    66          }
    67          else if (left.getClass().equals(right.getClass()))
    68          {
    69              return (!left.equals(right)) ? Boolean.TRUE : Boolean.FALSE;
    70          }
    71          else if(left instanceof Float || left instanceof Double ||
    72                  right instanceof Float || right instanceof Double)
    73          {
    74              return (!Coercion.coerceDouble(left).equals(Coercion.coerceDouble(right)))
    75                  ? Boolean.TRUE : Boolean.FALSE;
    76          }
    77          else if ( left instanceof Number || right instanceof Number ||
    78                     left instanceof Character || right instanceof Character)
    79          {
    80              return (!Coercion.coerceLong(left).equals(Coercion.coerceLong(right)))
    81                  ? Boolean.TRUE : Boolean.FALSE;
    82          }
    83          else if (left instanceof Boolean || right instanceof Boolean)
    84          {
    85              return (!Coercion.coerceBoolean(left).equals(Coercion.coerceBoolean(right)))
    86                  ? Boolean.TRUE : Boolean.FALSE;
    87          }
    88          else if (left instanceof java.lang.String || right instanceof String)
    89          {
    90              return (!left.toString().equals(right.toString())) ? Boolean.TRUE : Boolean.FALSE;
    91          }
    92
    93          return (!left.equals(right)) ? Boolean.TRUE : Boolean.FALSE;
    94      }
    95  }