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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
    17  package org.apache.commons.jexl.parser;
    18
    19  import org.apache.commons.jexl.JexlContext;
    20  import org.apache.commons.jexl.util.Coercion;
    21
    22  /***
    23   *  Multiplication
    24   *
    25   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    26   *  @version $Id: ASTMulNode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
    27   */
    28  public class ASTMulNode extends SimpleNode
    29  {
    30      public ASTMulNode(int id)
    31      {
    32          super(id);
    33      }
    34
    35      public ASTMulNode(Parser p, int id)
    36      {
    37          super(p, id);
    38      }
    39
    40
    41      /*** Accept the visitor. **/
    42      public Object jjtAccept(ParserVisitor visitor, Object data)
    43      {
    44          return visitor.visit(this, data);
    45      }
    46
    47      public Object value(JexlContext context)
    48          throws Exception
    49      {
    50          Object left = ((SimpleNode) jjtGetChild(0)).value(context);
    51          Object right = ((SimpleNode) jjtGetChild(1)).value(context);
    52
    53          /*
    54           *  the spec says 'and', I think 'or'
    55           */
    56          if (left == null && right == null)
    57              return new Integer(0);
    58
    59          /*
    60           *  if anything is float, double or string with ( "." | "E" | "e")
    61           *  coerce all to doubles and do it
    62           */
    63          if ( left instanceof Float || left instanceof Double
    64              || right instanceof Float || right instanceof Double
    65              || (  left instanceof String
    66                    && (  ((String) left).indexOf(".") != -1 ||
    67                          ((String) left).indexOf("e") != -1 ||
    68                          ((String) left).indexOf("E") != -1 )
    69                 )
    70              || (  right instanceof String
    71                    && (  ((String) right).indexOf(".") != -1 ||
    72                          ((String) right).indexOf("e") != -1 ||
    73                          ((String) right).indexOf("E") != -1 )
    74                 )
    75              )
    76          {
    77              Double l = Coercion.coerceDouble(left);
    78              Double r = Coercion.coerceDouble(right);
    79
    80              return new Double( l.doubleValue() * r.doubleValue() );
    81          }
    82
    83          /*
    84           * otherwise to longs with thee!
    85           */
    86
    87          Long l = Coercion.coerceLong(left);
    88          Long r = Coercion.coerceLong(right);
    89
    90          return new Long(l.longValue() * r.longValue());
    91      }
    92
    93  }
    94