01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.forms.datatype;
18:
19: import org.apache.cocoon.forms.validation.ValidationError;
20: import org.outerj.expression.ExpressionContext;
21:
22: /**
23: * Interface for validation rules. Most {@link Datatype} implementations will
24: * perform their validation by checking a number of these validation rules
25: * (though strictly spoken this is not required).
26: *
27: * @version $Id: ValidationRule.java 449149 2006-09-23 03:58:05Z crossley $
28: */
29: public interface ValidationRule {
30: /**
31: *
32: * @param value a value of a class supported by the ValidationRule implementation
33: * @param expressionContext many validation rules use the xReporter expression interpreter,
34: * the expressionContext allows to resolve variables used in these expressions.
35: */
36: ValidationError validate(Object value,
37: ExpressionContext expressionContext);
38:
39: /**
40: * Returns true if this ValidationRule supports validating objects of the same class
41: * as the one specified. If the flag 'arrayType' is true, this method will return true
42: * if this validation rule can validate arrays of these objects (i.e. the object passed
43: * to the validate method will then be an array).
44: */
45: boolean supportsType(Class clazz, boolean arrayType);
46: }
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