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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
    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 398206 2006-04-29 16:51:38Z dion $
    27   */
    28  public class ASTMulNode extends SimpleNode {
    29      /***
    30       * Create the node given an id.
    31       *
    32       * @param id node id.
    33       */
    34      public ASTMulNode(int id) {
    35          super(id);
    36      }
    37
    38      /***
    39       * Create a node with the given parser and id.
    40       *
    41       * @param p a parser.
    42       * @param id node id.
    43       */
    44      public ASTMulNode(Parser p, int id) {
    45          super(p, id);
    46      }
    47
    48      /*** {@inheritDoc} */
    49      public Object jjtAccept(ParserVisitor visitor, Object data) {
    50          return visitor.visit(this, data);
    51      }
    52
    53      /*** {@inheritDoc} */
    54      public Object value(JexlContext context) throws Exception {
    55          Object left = ((SimpleNode) jjtGetChild(0)).value(context);
    56          Object right = ((SimpleNode) jjtGetChild(1)).value(context);
    57
    58          /*
    59           * the spec says 'and', I think 'or'
    60           */
    61          if (left == null && right == null) {
    62              return new Byte((byte) 0);
    63          }
    64
    65          /*
    66           * if anything is float, double or string with ( "." | "E" | "e") coerce
    67           * all to doubles and do it
    68           */
    69          if (left instanceof Float
    70              || left instanceof Double
    71              || right instanceof Float
    72              || right instanceof Double
    73              || (left instanceof String
    74                  && (((String) left).indexOf(".") != -1
    75                      || ((String) left).indexOf("e") != -1
    76                      || ((String) left).indexOf("E") != -1))
    77              || (right instanceof String
    78                  && (((String) right).indexOf(".") != -1
    79                      || ((String) right).indexOf("e") != -1
    80                      || ((String) right).indexOf("E") != -1))) {
    81              Double l = Coercion.coerceDouble(left);
    82              Double r = Coercion.coerceDouble(right);
    83
    84              return new Double(l.doubleValue() * r.doubleValue());
    85          }
    86
    87          /*
    88           * otherwise to longs with thee!
    89           */
    90
    91          Long l = Coercion.coerceLong(left);
    92          Long r = Coercion.coerceLong(right);
    93
    94          return new Long(l.longValue() * r.longValue());
    95      }
    96
    97  }