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The AWS Java SDK for Amazon EC2 module holds the client classes that are used for communicating with Amazon EC2 Service

There is a newer version: 1.12.772

/*
 * Copyright 2013-2015 Amazon Technologies, Inc.
 *
 * 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.services.ec2.util;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.DescribeSecurityGroupsRequest;

public class SecurityGroupUtils {

    private static final String INVALID_GROUP_NOT_FOUND = "InvalidGroup.NotFound";

    /**
     * Provides a quick answer to whether a security group exists.
     *
     * @param ec2
     *            the EC2 client to use for making service requests
     * @param securityGroupName
     *            the name of the security group being queried
     * @throws AmazonClientException
     *             If any internal errors are encountered inside the client
     *             while attempting to make the request or handle the response.
     *             For example if a network connection is not available.
     * @throws AmazonServiceException
     *             If an error response is returned by AmazonEC2 indicating
     *             either a problem with the data in the request, or a server
     *             side issue.
     */
    public static boolean doesSecurityGroupExist(AmazonEC2 ec2,
            String securityGroupName) throws AmazonClientException,
            AmazonServiceException {

        DescribeSecurityGroupsRequest securityGroupsRequest =
                new DescribeSecurityGroupsRequest()
                    .withGroupNames(securityGroupName);

        try {
            ec2.describeSecurityGroups(securityGroupsRequest);
            return true;

        } catch (AmazonServiceException ase) {
            if (INVALID_GROUP_NOT_FOUND.equals(ase.getErrorCode())) {
                return false;
            }
            throw ase;
        }
    }
}