1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.jxpath.ri.compiler;
19
20 import org.apache.commons.jxpath.ri.EvalContext;
21 import org.apache.commons.jxpath.ri.axes.UnionContext;
22
23 /**
24 * Implementation of {@link Expression} for the operation "|".
25 */
26 public class CoreOperationUnion extends CoreOperation {
27
28 /**
29 * Constructs a new CoreOperationUnion.
30 *
31 * @param args Expression[]
32 */
33 public CoreOperationUnion(final Expression[] args) {
34 super(args);
35 }
36
37 @Override
38 public Object computeValue(final EvalContext context) {
39 final EvalContext[] argCtxs = new EvalContext[args.length];
40 for (int i = 0; i < args.length; i++) {
41 final Object value = args[i].compute(context);
42 if (value instanceof EvalContext) {
43 argCtxs[i] = (EvalContext) value;
44 } else {
45 argCtxs[i] = context.getRootContext().getConstantContext(value);
46 }
47 }
48 return new UnionContext(context.getRootContext(), argCtxs);
49 }
50
51 @Override
52 protected int getPrecedence() {
53 return UNION_PRECEDENCE;
54 }
55
56 @Override
57 public String getSymbol() {
58 return "|";
59 }
60
61 @Override
62 protected boolean isSymmetric() {
63 return true;
64 }
65 }