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 * Interface implemented by expression implementations.
21 *
22 * @author Jawaid Hakim.
23 */
24 public interface IExpression
25 {
26 /***
27 * Evaluate the expression.
28 *
29 * @param identifiers
30 * Identifier values.
31 * @return Result of the expression evaluation.
32 */
33 Object eval(final Map identifiers);
34
35 /***
36 * Evaluate the expression.
37 *
38 * @param provider
39 * Value provider. During evaluation of the expression callbacks
40 * are made on the value provider to get identifier values.
41 * @param corr
42 * Correlation data. Passed as-is to the value provider.
43 * @return Result evaluating the expression.
44 */
45 Object eval(final IValueProvider provider, final Object corr);
46 }
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