/*
 * Copyright 2005-2013 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.ldap.transaction.compensating;

import javax.naming.Name;
import javax.naming.directory.Attributes;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.ldap.core.LdapOperations;
import org.springframework.transaction.compensating.CompensatingTransactionOperationExecutor;

/**
 * A {@link CompensatingTransactionOperationExecutor} to manage a bind operation. Performs
 * a bind in {@link #performOperation()}, a corresponding unbind in {@link #rollback()},
 * and nothing in {@link #commit()}.
 *
 * @author Mattias Hellborg Arthursson
 * @since 1.2
 */
public class BindOperationExecutor implements CompensatingTransactionOperationExecutor {

	private static Logger log = LoggerFactory.getLogger(BindOperationExecutor.class);

	private LdapOperations ldapOperations;

	private Name dn;

	private Object originalObject;

	private Attributes originalAttributes;

	/**
	 * Constructor.
	 * @param ldapOperations {@link LdapOperations} to use for performing the rollback
	 * operation.
	 * @param dn DN of the entry to be unbound.
	 * @param originalObject original value sent to the 'object' parameter of the bind
	 * operation.
	 * @param originalAttributes original value sent to the 'attributes' parameter of the
	 * bind operation.
	 */
	public BindOperationExecutor(LdapOperations ldapOperations, Name dn, Object originalObject,
			Attributes originalAttributes) {
		this.ldapOperations = ldapOperations;
		this.dn = dn;
		this.originalObject = originalObject;
		this.originalAttributes = originalAttributes;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.springframework.ldap.support.transaction.
	 * CompensatingTransactionOperationExecutor#rollback()
	 */
	public void rollback() {
		try {
			this.ldapOperations.unbind(this.dn);
		}
		catch (Exception ex) {
			log.warn("Failed to rollback, dn:" + this.dn.toString(), ex);
		}
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.springframework.ldap.support.transaction.
	 * CompensatingTransactionOperationExecutor#commit()
	 */
	public void commit() {
		log.debug("Nothing to do in commit for bind operation");
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.springframework.ldap.support.transaction.
	 * CompensatingTransactionOperationExecutor#performOperation()
	 */
	public void performOperation() {
		log.debug("Performing bind operation");
		this.ldapOperations.bind(this.dn, this.originalObject, this.originalAttributes);
	}

	/**
	 * Get the DN. Package private for testing purposes.
	 * @return the target DN.
	 */
	Name getDn() {
		return this.dn;
	}

	/**
	 * Get the LdapOperations. Package private for testing purposes.
	 * @return the LdapOperations.
	 */
	LdapOperations getLdapOperations() {
		return this.ldapOperations;
	}

	Attributes getOriginalAttributes() {
		return this.originalAttributes;
	}

	Object getOriginalObject() {
		return this.originalObject;
	}

}
