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.InfoSetUtil;
22
23 /**
24 * A compile tree element containing a constant number or string.
25 */
26 public class Constant extends Expression {
27
28 private final Object value;
29
30 /**
31 * Constructs a new Constant.
32 *
33 * @param number constant
34 */
35 public Constant(final Number number) {
36 this.value = number;
37 }
38
39 /**
40 * Constructs a new Constant.
41 *
42 * @param string constant
43 */
44 public Constant(final String string) {
45 this.value = string;
46 }
47
48 @Override
49 public Object compute(final EvalContext context) {
50 return value;
51 }
52
53 /**
54 * Returns false
55 *
56 * @return false
57 */
58 @Override
59 public boolean computeContextDependent() {
60 return false;
61 }
62
63 @Override
64 public Object computeValue(final EvalContext context) {
65 return value;
66 }
67
68 /**
69 * Returns false
70 *
71 * @return false
72 */
73 @Override
74 public boolean isContextDependent() {
75 return false;
76 }
77
78 @Override
79 public String toString() {
80 if (value instanceof Number) {
81 return InfoSetUtil.stringValue(value);
82 }
83 return "'" + value + "'";
84 }
85 }