1 /**
2 * Copyright 2005-2012 The Kuali Foundation
3 *
4 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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.kuali.rice.krad.datadictionary.validation.processor;
17
18
19 import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;
20 import org.kuali.rice.krad.datadictionary.validation.AttributeValueReader;
21 import org.kuali.rice.krad.datadictionary.validation.constraint.Constraint;
22 import org.kuali.rice.krad.datadictionary.validation.result.DictionaryValidationResult;
23 import org.kuali.rice.krad.datadictionary.validation.result.ProcessorResult;
24
25 /**
26 * This interface must be implemented by constraint processors, which validate individual constraints in the
27 * data dictionary. The idea is that each constraint has its own processor, and that the validation service can be configured
28 * via dependency injection with a list of processors. This gives institutions the ability to easily modify how validation
29 * should be handled and to add arbitrary new constraints and constraint processors. An alternative might have been to put
30 * the process() method into the Constraint marker interface and have each Constraint define its own processing, but that would
31 * have forced business logic into what are naturally API classes (classes that implement Constraint). This strategy separates
32 * the two functions.
33 *
34 * @author Kuali Rice Team (rice.collab@kuali.org)
35 */
36 public interface ConstraintProcessor<T, C extends Constraint> {
37
38 public ProcessorResult process(DictionaryValidationResult result, T value, C constraint, AttributeValueReader attributeValueReader) throws AttributeValidationException;
39
40 public String getName();
41
42 public Class<? extends Constraint> getConstraintType();
43
44 /**
45 * This method return true if the processing of this constraint is something that can be opted out of by some pieces of code.
46 * The only example of this in the version under development (1.1) is the existence constraint.
47 *
48 * @return true if this processor can be turned off by some pieces of code, false otherwise
49 */
50 public boolean isOptional();
51
52 }