# RepositoryBasedDataSourceFinder.java

    /*
     *  Licensed to the Apache Software Foundation (ASF) under one
     *  or more contributor license agreements.  See the NOTICE file
     *  distributed with this work for additional information
     *  regarding copyright ownership.  The ASF licenses this file
     *  to you 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.datasource;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.SynapseCommonsException;

    import javax.sql.DataSource;

    /**
     * Finds a DataSource from  DataSource Repositories
     */
    public class RepositoryBasedDataSourceFinder {

        private final static Log log = LogFactory.getLog(RepositoryBasedDataSourceFinder.class);
        private DataSourceRepositoryManager dataSourceRepositoryManager;
        private boolean initialized;

        public void init(DataSourceRepositoryManager dataSourceRepositoryManager) {
            this.dataSourceRepositoryManager = dataSourceRepositoryManager;
            this.initialized = true;
        }

        /**
         * Find a DataSource using the given name
         *
         * @param name name of the DataSource to be found
         * @return DataSource if found , otherwise null
         */
        public DataSource find(String name) {
            assertInitialized();
            if (name == null || "".equals(name)) {
                throw new SynapseCommonsException("DataSource name cannot be found.", log);
            }
            return dataSourceRepositoryManager.getDataSource(name);
        }

        private void assertInitialized() {
            if (!initialized) {
                throw new SynapseCommonsException("RepositoryBasedDataSourceFinder has not been " +
                        "initialized with a 'DataSourceRepositoryManager' instance ", log);
            }
        }

        public boolean isInitialized() {
            return initialized;
        }
    }