01: /*
02: * Copyright 2002-2006 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: package org.apache.commons.jexl.parser;
17:
18: import java.math.BigDecimal;
19: import java.math.BigInteger;
20:
21: import org.apache.commons.jexl.JexlContext;
22:
23: /**
24: * - (unary minus).
25: *
26: * @author <a href="mailto:mhw@kremvax.net">Mark H. Wilkinson</a>
27: * @version $Id: ASTUnaryMinusNode.java 398325 2006-04-30 12:34:29Z dion $
28: */
29: public class ASTUnaryMinusNode extends SimpleNode {
30: /**
31: * Create the node given an id.
32: *
33: * @param id node id.
34: */
35: public ASTUnaryMinusNode(int id) {
36: super (id);
37: }
38:
39: /**
40: * Create a node with the given parser and id.
41: *
42: * @param p a parser.
43: * @param id node id.
44: */
45: public ASTUnaryMinusNode(Parser p, int id) {
46: super (p, id);
47: }
48:
49: /** {@inheritDoc} */
50: public Object jjtAccept(ParserVisitor visitor, Object data) {
51: return visitor.visit(this , data);
52: }
53:
54: /** {@inheritDoc} */
55: public Object value(JexlContext jc) throws Exception {
56: Object val = ((SimpleNode) jjtGetChild(0)).value(jc);
57:
58: if (val instanceof Byte) {
59: byte valueAsByte = ((Byte) val).byteValue();
60: return new Byte((byte) -valueAsByte);
61: } else if (val instanceof Short) {
62: short valueAsShort = ((Short) val).shortValue();
63: return new Short((short) -valueAsShort);
64: } else if (val instanceof Integer) {
65: int valueAsInt = ((Integer) val).intValue();
66: return new Integer(-valueAsInt);
67: } else if (val instanceof Long) {
68: long valueAsLong = ((Long) val).longValue();
69: return new Long(-valueAsLong);
70: } else if (val instanceof Float) {
71: float valueAsFloat = ((Float) val).floatValue();
72: return new Float(-valueAsFloat);
73: } else if (val instanceof Double) {
74: double valueAsDouble = ((Double) val).doubleValue();
75: return new Double(-valueAsDouble);
76: } else if (val instanceof BigDecimal) {
77: BigDecimal valueAsBigD = (BigDecimal) val;
78: return valueAsBigD.negate();
79: } else if (val instanceof BigInteger) {
80: BigInteger valueAsBigI = (BigInteger) val;
81: return valueAsBigI.negate();
82: }
83: throw new Exception("expression not a number");
84: }
85: }
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