# CallerContextFactory.java

    /*
    * Copyright 2004,2005 The Apache Software Foundation.
    *
    * 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.apache.synapse.commons.throttle.core.factory;

    import org.apache.synapse.commons.throttle.core.CallerContext;
    import org.apache.synapse.commons.throttle.core.ThrottleConstants;
    import org.apache.synapse.commons.throttle.core.ThrottleException;
    import org.apache.synapse.commons.throttle.core.impl.domainbase.DomainBaseCallerContext;
    import org.apache.synapse.commons.throttle.core.impl.ipbase.IPBaseCallerContext;
    import org.apache.synapse.commons.throttle.core.impl.rolebase.RoleBaseCallerContext;

    /**
     * Factory for creating a CallerContext
     */

    public class CallerContextFactory {

        /**
         * To create a CallerContext(the run time data holder for a remote caller)
         * for the given throttle type.
         * Needs to provide the ID(ip | domain) of the remote caller (ip/domain according to the policy)
         *
         * @param throttletype - The type of the throttle
         * @param id           - The id of the caller
         * @return caller       - The corresponding caller context for the given throttle type
         * @throws ThrottleException - Throws for if the throttle type is unknown
         */
        public static CallerContext createCaller(int throttletype, String id) throws ThrottleException {
            if (ThrottleConstants.IP_BASE == throttletype) {
                return new IPBaseCallerContext(id);
            } else if (ThrottleConstants.DOMAIN_BASE == throttletype) {
                return new DomainBaseCallerContext(id);
            } else if (ThrottleConstants.ROLE_BASE == throttletype) {
                return new RoleBaseCallerContext(id);
            } else {
                throw new ThrottleException("Unknown throttle type");
            }
        }
    }