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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ExpressionEvaluator.java | - | - | - | - |
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1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.tapestry.services; | |
16 | ||
17 | /** | |
18 | * Wrapper around the OGNL library. | |
19 | * | |
20 | * @author Howard M. Lewis Ship | |
21 | * @since 4.0 | |
22 | */ | |
23 | public interface ExpressionEvaluator | |
24 | { | |
25 | /** | |
26 | * Reads a property of the target, defined by the expression. | |
27 | * | |
28 | * @throws org.apache.hivemind.ApplicationRuntimeException | |
29 | * if the expression can not be parsed, or if some other error occurs during | |
30 | * evaluation of the expression. | |
31 | */ | |
32 | public Object read(Object target, String expression); | |
33 | ||
34 | /** | |
35 | * Reads a property of the target, defined by the (previously compiled) expression. | |
36 | * | |
37 | * @throws org.apache.hivemind.ApplicationRuntimeException | |
38 | * if some other error occurs during evaluation of the expression. | |
39 | */ | |
40 | public Object readCompiled(Object target, Object expression); | |
41 | ||
42 | /** | |
43 | * Updates a property of the target, defined by the expression. | |
44 | * | |
45 | * @throws org.apache.hivemind.ApplicationRuntimeException | |
46 | * if the expression can not be parsed, or if some other error occurs during | |
47 | * evaluation of the expression. | |
48 | */ | |
49 | public void write(Object target, String expression, Object value); | |
50 | ||
51 | /** | |
52 | * Updates a property of the target, defined by the (previously compiled) expression. | |
53 | * | |
54 | * @throws org.apache.hivemind.ApplicationRuntimeException | |
55 | * if some other error occurs during evaluation of the expression. | |
56 | */ | |
57 | public void writeCompiled(Object target, Object expression, Object value); | |
58 | ||
59 | /** | |
60 | * Returns true if the expression evaluates to a constant or other literal value. | |
61 | * | |
62 | * @throws org.apache.hivemind.ApplicationRuntimeException | |
63 | * if the expression is not valid | |
64 | */ | |
65 | public boolean isConstant(String expression); | |
66 | } |
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