1 /*
2 * Copyright 2006-2013 the original author or authors.
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.springframework.batch.core.step.skip;
17
18 import java.util.Map;
19
20 import org.springframework.classify.Classifier;
21 import org.springframework.classify.SubclassClassifier;
22
23 /**
24 * A {@link SkipPolicy} that depends on an exception classifier to make its
25 * decision, and then delegates to the classifier result.
26 *
27 * @author Dave Syer
28 *
29 * @see SubclassClassifier
30 */
31 public class ExceptionClassifierSkipPolicy implements SkipPolicy {
32
33 private SubclassClassifier<Throwable, SkipPolicy> classifier;
34
35 /**
36 * The classifier that will be used to choose a delegate policy.
37 *
38 * @param classifier the classifier to use to choose a delegate policy
39 */
40 public void setExceptionClassifier(SubclassClassifier<Throwable, SkipPolicy> classifier) {
41 this.classifier = classifier;
42 }
43
44 /**
45 * Setter for policy map. This property should not be changed dynamically -
46 * set it once, e.g. in configuration, and then don't change it during a
47 * running application. Either this property or the exception classifier
48 * directly should be set, but not both.
49 *
50 * @param policyMap a map of String to {@link SkipPolicy} that will be used
51 * to create a {@link Classifier} to locate a policy.
52 */
53 public void setPolicyMap(Map<Class<? extends Throwable>, SkipPolicy> policyMap) {
54 SubclassClassifier<Throwable, SkipPolicy> subclassClassifier = new SubclassClassifier<Throwable, SkipPolicy>(
55 policyMap, new NeverSkipItemSkipPolicy());
56 this.classifier = subclassClassifier;
57 }
58
59 /**
60 * Consult the classifier and find a delegate policy, and then use that to
61 * determine the outcome.
62 *
63 * @param t the throwable to consider
64 * @param skipCount the current skip count
65 * @return true if the exception can be skipped
66 * @throws SkipLimitExceededException if a limit is exceeded
67 */
68 @Override
69 public boolean shouldSkip(Throwable t, int skipCount) throws SkipLimitExceededException {
70 return classifier.classify(t).shouldSkip(t, skipCount);
71 }
72
73 }