    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.jxpath.ri.compiler;
    17
    18  import org.apache.commons.jxpath.ri.EvalContext;
    19  import org.apache.commons.jxpath.ri.InfoSetUtil;
    20
    21  /***
    22   * Implementation of Expression for the operation "&lt;".
    23   *
    24   * @author Dmitri Plotnikov
    25   * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:39 $
    26   */
    27  public class CoreOperationLessThan extends CoreOperation {
    28
    29      public CoreOperationLessThan(Expression arg1, Expression arg2) {
    30          super(new Expression[] { arg1, arg2 });
    31      }
    32
    33      public Object computeValue(EvalContext context) {
    34          double l = InfoSetUtil.doubleValue(args[0].computeValue(context));
    35          double r = InfoSetUtil.doubleValue(args[1].computeValue(context));
    36          return l < r ? Boolean.TRUE : Boolean.FALSE;
    37      }
    38
    39      protected int getPrecedence() {
    40          return 3;
    41      }
    42
    43      protected boolean isSymmetric() {
    44          return false;
    45      }
    46
    47      public String getSymbol() {
    48          return "<";
    49      }
    50  }