| 1 | /* |
| 2 | * Copyright 2006-2010 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.batch.classify.Classifier; |
| 21 | import org.springframework.batch.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 | public boolean shouldSkip(Throwable t, int skipCount) throws SkipLimitExceededException { |
| 69 | return classifier.classify(t).shouldSkip(t, skipCount); |
| 70 | } |
| 71 | |
| 72 | } |