1 /***
2 * Copyright 2003, 2004, 2005. CodeStreet LLC.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
7 *
8 * Unless required by applicable law or agreed to in writing, software
9 * distributed under the License is distributed on an "AS IS" BASIS,
10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 * See the License for the specific language governing permissions and
12 * limitations under the License.
13 */
14
15 package com.codestreet.selector.parser;
16
17 import java.util.HashMap;
18 import java.util.Map;
19
20 /***
21 * Class to represent a <tt>Long</tt> literal. Immutable.
22 *
23 * @author Jawaid Hakim.
24 */
25 final class LiteralLong implements IExpressionNumeric
26
27 {
28 /***
29 * Factory.
30 *
31 * @param literal
32 * Literal.
33 * @return Instance.
34 */
35 public static synchronized LiteralLong valueOf(final String literal)
36 {
37 LiteralLong instance = (LiteralLong) idMap_.get(literal);
38 if (instance == null)
39 {
40 instance = new LiteralLong(literal);
41 idMap_.put(literal, instance);
42 }
43 return instance;
44 }
45
46 /***
47 * Ctor.
48 *
49 * @param literal
50 * Long literal.
51 */
52 public LiteralLong(final String literal)
53 {
54 literal_ = new NumericValue(Long.valueOf(literal));
55 }
56
57 public Object eval(final Map identifiers)
58 {
59 return literal_;
60 }
61
62 public Object eval(final IValueProvider provider, final Object corr)
63 {
64 return literal_;
65 }
66
67 public String toString()
68 {
69 return literal_.toString();
70 }
71
72 private final NumericValue literal_;
73
74 private static Map idMap_ = new HashMap();
75 }
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