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Java > Open Source Codes > org > apache > cocoon > woody > datatype > ValidationRule


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
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
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.cocoon.woody.datatype;
17
18 import org.outerj.expression.ExpressionContext;
19
20 /**
21  * Interface for validation rules. Most {@link Datatype} implementations will
22  * perform their validation by checking a number of these validation rules
23  * (though strictly spoken this is not required).
24  *
25  * @version $Id: ValidationRule.java 30932 2004-07-29 17:35:38Z vgritsenko $
26  */
27 public interface ValidationRule {
28     /**
29      *
30      * @param value a value of a class supported by the ValidationRule implementation
31      * @param expressionContext many validation rules use the xReporter expression interpreter,
32      * the expressionContext allows to resolve variables used in these expressions.
33      */
34     ValidationError validate(Object JavaDoc value, ExpressionContext expressionContext);
35
36     /**
37      * Returns true if this ValidationRule supports validating objects of the same class
38      * as the one specified. If the flag 'arrayType' is true, this method will return true
39      * if this validation rule can validate arrays of these objects (i.e. the object passed
40      * to the validate method will then be an array).
41      */
42     boolean supportsType(Class JavaDoc clazz, boolean arrayType);
43 }
44
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