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.Map;
18
19 /***
20 * Class to represent the <tt>bool</tt> equality operator. Immutable.
21 *
22 * @author Jawaid Hakim.
23 */
24 class OpBoolEQ implements IExpressionBool
25 {
26 /***
27 * Ctor.
28 *
29 * @param lhs
30 * LHS of the equality.
31 * @param rhs
32 * RHS of the equality.
33 */
34 public OpBoolEQ(final IExpression lhs, final IExpression rhs)
35 {
36 lhs_ = lhs;
37 rhs_ = rhs;
38 }
39
40 public Object eval(final Map identifiers)
41 {
42 Object oLhs = lhs_.eval(identifiers);
43 if (!(oLhs instanceof Boolean))
44 return Result.RESULT_UNKNOWN;
45 boolean lhs = ((Boolean) oLhs).booleanValue();
46
47 Object oRhs = rhs_.eval(identifiers);
48 if (!(oRhs instanceof Boolean))
49 return Result.RESULT_UNKNOWN;
50 boolean rhs = ((Boolean) oRhs).booleanValue();
51
52 if (lhs == rhs)
53 return Result.RESULT_TRUE;
54 else
55 return Result.RESULT_FALSE;
56 }
57
58 public Object eval(final IValueProvider provider, final Object corr)
59 {
60 Object oLhs = lhs_.eval(provider, corr);
61 if (!(oLhs instanceof Boolean))
62 return Result.RESULT_UNKNOWN;
63 boolean lhs = ((Boolean) oLhs).booleanValue();
64
65 Object oRhs = rhs_.eval(provider, corr);
66 if (!(oRhs instanceof Boolean))
67 return Result.RESULT_UNKNOWN;
68 boolean rhs = ((Boolean) oRhs).booleanValue();
69
70 if (lhs == rhs)
71 return Result.RESULT_TRUE;
72 else
73 return Result.RESULT_FALSE;
74 }
75
76 public String toString()
77 {
78 return lhs_.toString() + " = " + rhs_.toString();
79 }
80
81 private final IExpression lhs_;
82
83 private final IExpression rhs_;
84
85 }
This page was automatically generated by Maven