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    1   /*
    2    * Copyright 2003-2006 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.util.Coercion;
    19  import org.apache.commons.jexl.JexlContext;
    20
    21  /***
    22   * a / b, mathematical divide.
    23   *
    24   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    25   * @version $Id: ASTDivNode.java 398187 2006-04-29 15:58:45Z dion $
    26   */
    27  public class ASTDivNode extends SimpleNode {
    28      /***
    29       * Create the node given an id.
    30       *
    31       * @param id node id.
    32       */
    33      public ASTDivNode(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 ASTDivNode(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 jc) throws Exception {
    54          Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
    55          Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
    56
    57          /*
    58           * the spec says 'and', I think 'or'
    59           */
    60          if (left == null && right == null) {
    61              return new Byte((byte) 0);
    62          }
    63
    64          Double l = Coercion.coerceDouble(left);
    65          Double r = Coercion.coerceDouble(right);
    66
    67          /*
    68           * catch div/0
    69           */
    70          if (r.doubleValue() == 0.0) {
    71              return new Double(0.0);
    72          }
    73
    74          return new Double(l.doubleValue() / r.doubleValue());
    75
    76      }
    77  }