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.axes.UnionContext;
20:
21: /**
22: * Implementation of Expression for the operation "|".
23: *
24: * @author Dmitri Plotnikov
25: * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:39 $
26: */
27: public class CoreOperationUnion extends CoreOperation {
28:
29: public CoreOperationUnion(Expression args[]) {
30: super (args);
31: }
32:
33: public Object computeValue(EvalContext context) {
34: EvalContext argCtxs[] = new EvalContext[args.length];
35: for (int i = 0; i < args.length; i++) {
36: Object value = args[i].compute(context);
37: if (value instanceof EvalContext) {
38: argCtxs[i] = (EvalContext) value;
39: } else {
40: argCtxs[i] = context.getRootContext()
41: .getConstantContext(value);
42: }
43: }
44: return new UnionContext(context.getRootContext(), argCtxs);
45: }
46:
47: protected int getPrecedence() {
48: return 7;
49: }
50:
51: protected boolean isSymmetric() {
52: return true;
53: }
54:
55: public String getSymbol() {
56: return "|";
57: }
58: }
|