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/*
 * Copyright 2002-2005 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.transaction.annotation;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

import org.springframework.transaction.interceptor.AbstractFallbackTransactionAttributeSource;
import org.springframework.transaction.interceptor.NoRollbackRuleAttribute;
import org.springframework.transaction.interceptor.RollbackRuleAttribute;
import org.springframework.transaction.interceptor.RuleBasedTransactionAttribute;
import org.springframework.transaction.interceptor.TransactionAttribute;

/**
 * Implementation of TransactionAttributeSource for working
 * with transaction metadata in JDK 1.5+ annotation format.
 *
 * 
This class reads the JDK 1.5+ Transactional annotation
 * and exposes corresponding transaction attributes to Spring's transaction
 * infrastructure.
 *
 * This is a direct alternative to AttributesTransactionAttributeSource,
 * which is able to read in source-level attributes via Commons Attributes.
 *
 * @author Colin Sampaleanu
 * @author Juergen Hoeller
 * @since 1.2
 * @see Transactional
 * @see org.springframework.transaction.interceptor.TransactionInterceptor#setTransactionAttributeSource
 * @see org.springframework.transaction.interceptor.TransactionProxyFactoryBean#setTransactionAttributeSource
 * @see org.springframework.transaction.interceptor.AttributesTransactionAttributeSource
 * @see org.springframework.metadata.commons.CommonsAttributes
 */
public class AnnotationTransactionAttributeSource
		extends AbstractFallbackTransactionAttributeSource {

	/**
	 * Returns all JDK 1.5+ annotations found for the given method.
	 */
	protected Collection findAllAttributes(Method method) {
		return Arrays.asList(method.getAnnotations());
	}

	/**
	 * Returns all JDK 1.5+ annotations found for the given class.
	 */
	protected Collection findAllAttributes(Class clazz) {
		return Arrays.asList(clazz.getAnnotations());
	}

	/**
	 * Return the transaction attribute, given this set of attributes
	 * attached to a method or class. Overrides method from parent class.
	 * This version actually converts JDK 5.0+ Annotations to the Spring
	 * classes. Returns null if it's not transactional.
	 * @param atts attributes attached to a method or class. May
	 * be null, in which case a null TransactionAttribute will be returned.
	 * @return TransactionAttribute configured transaction attribute,
	 * or null if none was found
	 */
	protected TransactionAttribute findTransactionAttribute(Collection atts) {
		if (atts == null) {
			return null;
		}

		// See if there is a transaction annotation.
		for (Object att : atts) {
			if (att instanceof Transactional) {
				Transactional ruleBasedTx = (Transactional) att;

				RuleBasedTransactionAttribute rbta = new RuleBasedTransactionAttribute();
				rbta.setPropagationBehavior(ruleBasedTx.propagation().value());
				rbta.setIsolationLevel(ruleBasedTx.isolation().value());
				rbta.setReadOnly(ruleBasedTx.readOnly());

				ArrayList rollBackRules = new ArrayList();

				Class[] rbf = ruleBasedTx.rollbackFor();
				for (int i = 0; i < rbf.length; ++i) {
					RollbackRuleAttribute rule = new RollbackRuleAttribute(rbf[i]);
					rollBackRules.add(rule);
				}

				String[] rbfc = ruleBasedTx.rollbackForClassName();
				for (int i = 0; i < rbfc.length; ++i) {
					RollbackRuleAttribute rule = new RollbackRuleAttribute(rbfc[i]);
					rollBackRules.add(rule);
				}

				Class[] nrbf = ruleBasedTx.noRollbackFor();
				for (int i = 0; i < nrbf.length; ++i) {
					NoRollbackRuleAttribute rule = new NoRollbackRuleAttribute(nrbf[i]);
					rollBackRules.add(rule);
				}

				String[] nrbfc = ruleBasedTx.noRollbackForClassName();
				for (int i = 0; i < nrbfc.length; ++i) {
					NoRollbackRuleAttribute rule = new NoRollbackRuleAttribute(nrbfc[i]);
					rollBackRules.add(rule);
				}

				rbta.getRollbackRules().addAll(rollBackRules);

				return rbta;
			}
		}

		return null;
	}

}