View Javadoc

    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   *  represents equality between integers - use .equals() for strings
    23   *
    24   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    25   *  @version $Id: ASTEQNode.java,v 1.7 2004/08/22 01:53:27 dion Exp $
    26   */
    27  public class ASTEQNode extends SimpleNode
    28  {
    29      public ASTEQNode(int id)
    30      {
    31          super(id);
    32      }
    33
    34      public ASTEQNode(Parser p, int id)
    35      {
    36          super(p, id);
    37      }
    38
    39      /*** Accept the visitor. **/
    40      public Object jjtAccept(ParserVisitor visitor, Object data)
    41      {
    42          return visitor.visit(this, data);
    43      }
    44
    45      public Object value(JexlContext pc)
    46          throws Exception
    47      {
    48          Object left = ( (SimpleNode) jjtGetChild(0)).value(pc);
    49          Object right = ( (SimpleNode) jjtGetChild(1)).value(pc);
    50
    51          if (left == null && right == null)
    52          {
    53              /*
    54               * if both are null L == R
    55               */
    56              return Boolean.TRUE;
    57          }
    58          else if (left==null || right==null)
    59          {
    60              /*
    61               * we know both aren't null, therefore L != R
    62               */
    63              return Boolean.FALSE;
    64          }
    65          else if (left.getClass().equals(right.getClass()))
    66          {
    67              return left.equals(right) ? Boolean.TRUE : Boolean.FALSE;
    68          }
    69          else if(left instanceof Float || left instanceof Double ||
    70                  right instanceof Float || right instanceof Double)
    71          {
    72              Double l = Coercion.coerceDouble(left);
    73              Double r = Coercion.coerceDouble(right);
    74
    75              return l.equals(r) ? 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  }