NotNode


1   
2   // Copyright (C) 1998-1999
3   // Object Oriented Concepts, Inc.
4   
5   // **********************************************************************
6   //
7   // Copyright (c) 1997
8   // Mark Spruiell (mark@intellisoft.com)
9   //
10  // See the COPYING file for more information
11  //
12  // **********************************************************************
13  
14  package org.jacorb.trading.constraint;
15  
16  import java.io.*;
17  
18  
19  /** Represents logical "NOT" */
20  public class NotNode extends ExprNode
21  {
22    private ExprNode m_child;
23  
24  
25    private NotNode()
26    {
27    }
28  
29  
30    public NotNode(ExprNode child)
31    {
32      m_child = child;
33  
34      setType(new ValueType(ValueType.BOOLEAN));
35    }
36  
37  
38    public void print(PrintStream ps)
39    {
40      ps.println("NotNode: type = " + getType());
41      ps.println("Child node:");
42      m_child.print(ps);
43    }
44  
45  
46    public Value evaluate(PropertySource source)
47      throws MissingPropertyException
48    {
49      Value result = null;
50  
51      Value v = m_child.evaluate(source);
52  
53      Boolean   b = (Boolean  )v.getValue();
54  
55      result = ValueFactory.createBoolean(! b.booleanValue());
56  
57      return result;
58    }
59  }
60  
61  
62  
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66  
67  
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