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:
17: package org.apache.commons.jexl.parser;
18:
19: import org.apache.commons.jexl.util.Coercion;
20: import org.apache.commons.jexl.JexlContext;
21:
22: /**
23: * Subtraction.
24: *
25: * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26: * @author <a href="mailto:mhw@kremvax.net">Mark H. Wilkinson</a>
27: * @version $Id: ASTSubtractNode.java 398325 2006-04-30 12:34:29Z dion $
28: */
29: public class ASTSubtractNode extends SimpleNode {
30: /**
31: * Create the node given an id.
32: *
33: * @param id node id.
34: */
35: public ASTSubtractNode(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 ASTSubtractNode(Parser p, int id) {
46: super (p, id);
47: }
48:
49: /** {@inheritDoc} */
50: public Object value(JexlContext context) throws Exception {
51: Object left = ((SimpleNode) jjtGetChild(0)).value(context);
52: Object right = ((SimpleNode) jjtGetChild(1)).value(context);
53:
54: /*
55: * the spec says 'and', I think 'or'
56: */
57: if (left == null && right == null) {
58: return new Byte((byte) 0);
59: }
60:
61: /*
62: * if anything is float, double or string with ( "." | "E" | "e") coerce
63: * all to doubles and do it
64: */
65: if (left instanceof Float
66: || left instanceof Double
67: || right instanceof Float
68: || right instanceof Double
69: || (left instanceof String && (((String) left)
70: .indexOf(".") != -1
71: || ((String) left).indexOf("e") != -1 || ((String) left)
72: .indexOf("E") != -1))
73: || (right instanceof String && (((String) right)
74: .indexOf(".") != -1
75: || ((String) right).indexOf("e") != -1 || ((String) right)
76: .indexOf("E") != -1))) {
77: Double l = Coercion.coerceDouble(left);
78: Double r = Coercion.coerceDouble(right);
79:
80: return new Double(l.doubleValue() - r.doubleValue());
81: }
82:
83: /*
84: * otherwise to longs with thee!
85: */
86:
87: Long l = Coercion.coerceLong(left);
88: Long r = Coercion.coerceLong(right);
89:
90: return new Long(l.longValue() - r.longValue());
91:
92: }
93:
94: /** {@inheritDoc} */
95: public Object jjtAccept(ParserVisitor visitor, Object data) {
96: return visitor.visit(this, data);
97: }
98: }
|