01: /*
02: * $Id: RoundFunction.java,v 1.7 2005/05/02 22:28:41 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002-2005 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40: package org.axiondb.functions;
41:
42: import org.axiondb.AxionException;
43: import org.axiondb.DataType;
44: import org.axiondb.FunctionFactory;
45: import org.axiondb.RowDecorator;
46: import org.axiondb.Selectable;
47: import org.axiondb.types.BigDecimalType;
48: import java.math.BigDecimal;
49: import org.axiondb.types.IntegerType;
50:
51: /**
52: * @version $Revision: 1.7 $ $Date: 2005/05/02 22:28:41 $
53: * @author Sudhendra Seshachala
54: * @author Ahimanikya Satapathy
55: */
56: public class RoundFunction extends BaseFunction implements
57: ScalarFunction, FunctionFactory {
58:
59: /** Creates a new instance of Class */
60: public RoundFunction() {
61: super ("ROUND");
62: }
63:
64: public ConcreteFunction makeNewInstance() {
65: return new RoundFunction();
66: }
67:
68: /** {@link StringType} */
69: public DataType getDataType() {
70: return RETURN_TYPE;
71: }
72:
73: public Object evaluate(RowDecorator row) throws AxionException {
74: Selectable sel = getArgument(0);
75: Object val = sel.evaluate(row);
76: DataType type = sel.getDataType();
77:
78: BigDecimal bd = type.toBigDecimal(val);
79: if (bd == null) {
80: return null;
81: }
82: int scale = 0;
83: if (getArgumentCount() == 2) {
84: Selectable sel1 = getArgument(1);
85: Object val1 = sel1.evaluate(row);
86: Integer intVal = (Integer) (ARG_TYPE.convert(val1));
87: scale = intVal.intValue();
88: }
89: return bd.setScale(scale, BigDecimal.ROUND_HALF_UP);
90: }
91:
92: public boolean isValid() {
93: return (getArgumentCount() >= 1 && getArgumentCount() < 3);
94: }
95:
96: private static final DataType RETURN_TYPE = new BigDecimalType();
97: private static final DataType ARG_TYPE = new IntegerType();
98: }
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