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1   /*
2    * Copyright (c) 2011.  The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.expreval.expr.calculation;
22  
23  import org.apache.expreval.expr.DelegateStmt;
24  import org.apache.expreval.expr.ExpressionType;
25  import org.apache.expreval.expr.Operator;
26  import org.apache.expreval.expr.node.GenericValue;
27  
28  public abstract class GenericCalculation extends DelegateStmt<GenericCalculation> {
29  
30      private final Operator operator;
31  
32      protected GenericCalculation(final ExpressionType type,
33                                   final GenericValue arg0,
34                                   final Operator operator,
35                                   final GenericValue arg1) {
36          super(type, arg0, arg1);
37          this.operator = operator;
38      }
39  
40      protected Operator getOperator() {
41          return this.operator;
42      }
43  
44      public String asString() {
45          if (this.getOperator() == Operator.NEGATIVE)
46              return "-" + this.getExprArg(0).asString();
47          else
48              return this.getExprArg(0).asString() + " " + this.getOperator() + " " + this.getExprArg(1).asString();
49      }
50  }