01: /*
02: * Copyright 2002-2004 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.jxpath.ri.compiler;
17:
18: import org.apache.commons.jxpath.ri.EvalContext;
19: import org.apache.commons.jxpath.ri.InfoSetUtil;
20:
21: /**
22: * Implementation of Expression for the operation "+".
23: *
24: * @author Dmitri Plotnikov
25: * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:38 $
26: */
27: public class CoreOperationAdd extends CoreOperation {
28:
29: public CoreOperationAdd(Expression[] args) {
30: super (args);
31: }
32:
33: public Object computeValue(EvalContext context) {
34: double s = 0.0;
35: for (int i = 0; i < args.length; i++) {
36: s += InfoSetUtil.doubleValue(args[i].computeValue(context));
37: }
38: return new Double(s);
39: }
40:
41: protected int getPrecedence() {
42: return 4;
43: }
44:
45: protected boolean isSymmetric() {
46: return true;
47: }
48:
49: public String getSymbol() {
50: return "+";
51: }
52: }
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