NumericFunctionNode


1   
2   /*
3    * Copyright (c) 1998 - 2005 Versant Corporation
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    * http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Contributors:
10   * Versant Corporation - initial API and implementation
11   */
12  package com.versant.core.ejb.query;
13  
14  /**
15   * Functions that return numerics.
16   */
17  public class NumericFunctionNode extends Node {
18  
19      public static final int LENGTH = 1;
20      public static final int LOCATE = 2;
21      public static final int ABS = 3;
22      public static final int SQRT = 4;
23      public static final int MOD = 5;
24      public static final int BIT_LENGTH = 6;
25  
26      private int function;
27      private Node args;
28  
29      public NumericFunctionNode(int function, Node args) {
30          this.function = function;
31          this.args = args;
32      }
33  
34      public int getFunction() {
35          return function;
36      }
37  
38      public Node getArgs() {
39          return args;
40      }
41  
42      public String   getFunctionStr() {
43          switch (function) {
44              case LENGTH:        return "LENGTH";
45              case LOCATE:        return "LOCATE";
46              case ABS:           return "ABS";
47              case SQRT:          return "SQRT";
48              case MOD:           return "MOD";
49              case BIT_LENGTH:    return "BIT_LENGTH";
50          }
51          return "<? function " + function + " ?>";
52      }
53  
54      public Object   arrive(NodeVisitor v, Object   msg) {
55          return v.arriveNumericFunctionNode(this, msg);
56      }
57  
58      public String   toStringImp() {
59          StringBuffer   s = new StringBuffer  ();
60          s.append(getFunctionStr());
61          s.append('(');
62          if (args != null) {
63              args.appendList(s);
64          }
65          s.append(')');
66          return s.toString();
67      }
68  
69      public void resolve(ResolveContext rc) {
70          args.resolve(rc);
71      }
72  
73  }
74  
75
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