/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package org.springframework.dao.support;

import java.util.ArrayList;
import java.util.List;

import org.springframework.dao.DataAccessException;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

Implementation of PersistenceExceptionTranslator that supports chaining, allowing the addition of PersistenceExceptionTranslator instances in order. Returns non-null on the first (if any) match.
Author:Rod Johnson, Juergen Hoeller
Since:2.0
/** * Implementation of {@link PersistenceExceptionTranslator} that supports chaining, * allowing the addition of PersistenceExceptionTranslator instances in order. * Returns {@code non-null} on the first (if any) match. * * @author Rod Johnson * @author Juergen Hoeller * @since 2.0 */
public class ChainedPersistenceExceptionTranslator implements PersistenceExceptionTranslator {
List of PersistenceExceptionTranslators.
/** List of PersistenceExceptionTranslators. */
private final List<PersistenceExceptionTranslator> delegates = new ArrayList<>(4);
Add a PersistenceExceptionTranslator to the chained delegate list.
/** * Add a PersistenceExceptionTranslator to the chained delegate list. */
public final void addDelegate(PersistenceExceptionTranslator pet) { Assert.notNull(pet, "PersistenceExceptionTranslator must not be null"); this.delegates.add(pet); }
Return all registered PersistenceExceptionTranslator delegates (as array).
/** * Return all registered PersistenceExceptionTranslator delegates (as array). */
public final PersistenceExceptionTranslator[] getDelegates() { return this.delegates.toArray(new PersistenceExceptionTranslator[0]); } @Override @Nullable public DataAccessException translateExceptionIfPossible(RuntimeException ex) { for (PersistenceExceptionTranslator pet : this.delegates) { DataAccessException translatedDex = pet.translateExceptionIfPossible(ex); if (translatedDex != null) { return translatedDex; } } return null; } }