UnaryMinusPtg


1   /* ====================================================================
2      Copyright 2003-2004   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.poi.hssf.record.formula;
18  
19  import java.util.List  ;
20  
21  import org.apache.poi.hssf.model.Workbook;
22  
23  /**
24   * Unary Plus operator
25   * does not have any effect on the operand
26   * @author Avik Sengupta
27   */
28  
29  public class UnaryMinusPtg extends OperationPtg
30  {
31      public final static int  SIZE = 1;
32      public final static byte sid  = 0x13;
33      
34      private final static String   MINUS = "-";
35  
36      /** Creates new AddPtg */
37  
38      public UnaryMinusPtg()
39      {
40      }
41  
42      public UnaryMinusPtg(byte[] data, int offset)
43      {
44  
45          // doesn't need anything
46      }
47      
48     
49      public void writeBytes(byte [] array, int offset)
50      {
51          array[ offset + 0 ] = sid;
52      }
53  
54      public int getSize()
55      {
56          return SIZE;
57      }
58  
59      public int getType()
60      {
61          return this.TYPE_UNARY;
62      }
63  
64      public int getNumberOfOperands()
65      {
66          return 1;
67      }
68      
69      /** Implementation of method from Ptg */
70      public String   toFormulaString(Workbook book)
71      {
72          return "+";
73      }
74         
75     /** implementation of method from OperationsPtg*/  
76      public String   toFormulaString(String  [] operands) {
77          StringBuffer   buffer = new StringBuffer  ();
78          buffer.append(MINUS);
79          buffer.append(operands[ 0]);
80          return buffer.toString();
81      }
82      
83      public byte getDefaultOperandClass() {return Ptg.CLASS_VALUE;}
84             
85      public Object   clone() {
86        return new UnaryPlusPtg();
87      }
88  
89  }
90
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