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Java > Open Source Codes > com > caucho > amber > expr > fun > SumFunExpr


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free Software Foundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Rodrigo Westrupp
27  */
28
29 package com.caucho.amber.expr.fun;
30
31 import com.caucho.amber.query.QueryParser;
32 import com.caucho.amber.expr.AmberExpr;
33 import com.caucho.amber.type.*;
34 import com.caucho.util.L10N;
35
36 import java.util.ArrayList JavaDoc;
37
38
39 /**
40  * SUM() function expression
41  */
42 public class SumFunExpr extends FunExpr {
43   private static final L10N L = new L10N(SumFunExpr.class);
44
45   private AmberExpr _arg;
46
47   /**
48    * Creates a new function expression
49    */
50   protected SumFunExpr(QueryParser parser,
51                        String JavaDoc id,
52                        ArrayList JavaDoc<AmberExpr> args,
53                        boolean distinct)
54   {
55     super(parser, id, args, distinct);
56
57     // XXX: needs to throw IllegalArgument for empty args
58 _arg = args.get(0);
59   }
60
61   public static SumFunExpr create(QueryParser parser,
62                                   String JavaDoc id,
63                                   ArrayList JavaDoc<AmberExpr> args,
64                                   boolean distinct)
65   {
66     return new SumFunExpr(parser, id, args, distinct);
67   }
68
69   /**
70    * Returns the expr type.
71    */
72   public Type getType()
73   {
74     // int/Integer -> Long and float/Float -> Double
75 Type argType = _arg.getType();
76
77     if ((argType instanceof IntegerType) ||
78         (argType instanceof PrimitiveIntType))
79       return LongType.create();
80
81     if ((argType instanceof FloatType) ||
82         (argType instanceof PrimitiveFloatType))
83       return DoubleType.create();
84
85     return argType;
86   }
87 }
88
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