Spring Framework example source code file (ChainedPersistenceExceptionTranslator.java)

This example Spring Framework source code file (ChainedPersistenceExceptionTranslator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

arraylist, chainedpersistenceexceptiontranslator, chainedpersistenceexceptiontranslator, dataaccessexception, dataaccessexception, iterator, iterator, list, persistenceexceptiontranslator, persistenceexceptiontranslator, util

The Spring Framework ChainedPersistenceExceptionTranslator.java source code

/*
 * Copyright 2002-2006 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.
 */

package org.springframework.dao.support;

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

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

/**
 * Implementation of 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 */
	private final List delegates = new ArrayList(4);


	/**
	 * 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).
	 */
	public final PersistenceExceptionTranslator[] getDelegates() {
		return (PersistenceExceptionTranslator[])
				this.delegates.toArray(new PersistenceExceptionTranslator[this.delegates.size()]);
	}


	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
		DataAccessException translatedDex = null;
		for (Iterator it = this.delegates.iterator(); translatedDex == null && it.hasNext(); ) {
			PersistenceExceptionTranslator pet = (PersistenceExceptionTranslator) it.next();
			translatedDex = pet.translateExceptionIfPossible(ex);
		}
		return translatedDex;
	}

}