/*
 * Copyright 2002-2020 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
 *
 *      https://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.interceptor;

import java.beans.PropertyEditorSupport;

import org.springframework.util.StringUtils;

PropertyEditor for TransactionAttribute objects. Accepts a String of form 
PROPAGATION_NAME, ISOLATION_NAME, readOnly, timeout_NNNN,+Exception1,-Exception2 
where only propagation code is required. For example:
PROPAGATION_MANDATORY, ISOLATION_DEFAULT 
The tokens can be in any order. Propagation and isolation codes
must use the names of the constants in the TransactionDefinition class. Timeout values
are in seconds. If no timeout is specified, the transaction manager will apply a default
timeout specific to the particular transaction manager.
A "+" before an exception name substring indicates that transactions should commit
even if this exception is thrown; a "-" that they should roll back.
Author:
Rod Johnson, Juergen Hoeller
See Also:
TransactionDefinition
Constants
Since:
24.04.2003/**
 * PropertyEditor for {@link TransactionAttribute} objects. Accepts a String of form
 * <p>{@code PROPAGATION_NAME, ISOLATION_NAME, readOnly, timeout_NNNN,+Exception1,-Exception2}
 * <p>where only propagation code is required. For example:
 * <p>{@code PROPAGATION_MANDATORY, ISOLATION_DEFAULT}
 *
 * <p>The tokens can be in <strong>any</strong> order. Propagation and isolation codes
 * must use the names of the constants in the TransactionDefinition class. Timeout values
 * are in seconds. If no timeout is specified, the transaction manager will apply a default
 * timeout specific to the particular transaction manager.
 *
 * <p>A "+" before an exception name substring indicates that transactions should commit
 * even if this exception is thrown; a "-" that they should roll back.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 24.04.2003
 * @see org.springframework.transaction.TransactionDefinition
 * @see org.springframework.core.Constants
 */
public class TransactionAttributeEditor extends PropertyEditorSupport {

	
Format is PROPAGATION_NAME,ISOLATION_NAME,readOnly,timeout_NNNN,+Exception1,-Exception2.
Null or the empty string means that the method is non transactional.
/**
	 * Format is PROPAGATION_NAME,ISOLATION_NAME,readOnly,timeout_NNNN,+Exception1,-Exception2.
	 * Null or the empty string means that the method is non transactional.
	 */
	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		if (StringUtils.hasLength(text)) {
			// tokenize it with ","
			String[] tokens = StringUtils.commaDelimitedListToStringArray(text);
			RuleBasedTransactionAttribute attr = new RuleBasedTransactionAttribute();
			for (String token : tokens) {
				// Trim leading and trailing whitespace.
				String trimmedToken = StringUtils.trimWhitespace(token.trim());
				// Check whether token contains illegal whitespace within text.
				if (StringUtils.containsWhitespace(trimmedToken)) {
					throw new IllegalArgumentException(
							"Transaction attribute token contains illegal whitespace: [" + trimmedToken + "]");
				}
				// Check token type.
				if (trimmedToken.startsWith(RuleBasedTransactionAttribute.PREFIX_PROPAGATION)) {
					attr.setPropagationBehaviorName(trimmedToken);
				}
				else if (trimmedToken.startsWith(RuleBasedTransactionAttribute.PREFIX_ISOLATION)) {
					attr.setIsolationLevelName(trimmedToken);
				}
				else if (trimmedToken.startsWith(RuleBasedTransactionAttribute.PREFIX_TIMEOUT)) {
					String value = trimmedToken.substring(DefaultTransactionAttribute.PREFIX_TIMEOUT.length());
					attr.setTimeoutString(value);
				}
				else if (trimmedToken.equals(RuleBasedTransactionAttribute.READ_ONLY_MARKER)) {
					attr.setReadOnly(true);
				}
				else if (trimmedToken.startsWith(RuleBasedTransactionAttribute.PREFIX_COMMIT_RULE)) {
					attr.getRollbackRules().add(new NoRollbackRuleAttribute(trimmedToken.substring(1)));
				}
				else if (trimmedToken.startsWith(RuleBasedTransactionAttribute.PREFIX_ROLLBACK_RULE)) {
					attr.getRollbackRules().add(new RollbackRuleAttribute(trimmedToken.substring(1)));
				}
				else {
					throw new IllegalArgumentException("Invalid transaction attribute token: [" + trimmedToken + "]");
				}
			}
			attr.resolveAttributeStrings(null);  // placeholders expected to be pre-resolved
			setValue(attr);
		}
		else {
			setValue(null);
		}
	}

}