# DataSourceInformationListFactory.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.factory;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.datasource.DataSourceConstants;
    import org.apache.synapse.commons.datasource.DataSourceInformation;
    import org.apache.synapse.commons.util.MiscellaneousUtil;

    import java.util.ArrayList;
    import java.util.List;
    import java.util.Properties;

    /**
     * Contains Factory method that use to create List of DataSourceInformations -
     * a DataSourceInformation Collection
     */
    public class DataSourceInformationListFactory {

        private static final Log log = LogFactory.getLog(DataSourceInformationListFactory.class);

        /**
         * Factory method for creating a  a DataSourceInformation Collection
         *
         * @param dsProperties Datasource configuration properties
         * @return A List of DataSourceInformation
         */
        public static List<DataSourceInformation> createDataSourceInformationList(
                Properties dsProperties) {

            final List<DataSourceInformation> dataSourceInformations =
                    new ArrayList<DataSourceInformation>();
            if (dsProperties == null) {
                if (log.isDebugEnabled()) {
                    log.debug("DataSource properties cannot be found..");
                }
                return dataSourceInformations;
            }

            String dataSources = MiscellaneousUtil.getProperty(dsProperties,
                    DataSourceConstants.PROP_SYNAPSE_PREFIX_DS, null);

            if (dataSources == null || "".equals(dataSources)) {
                if (log.isDebugEnabled()) {
                    log.debug("No DataSources defined for initialization..");
                }
                return dataSourceInformations;
            }

            String[] dataSourcesNames = dataSources.split(",");
            if (dataSourcesNames == null || dataSourcesNames.length == 0) {
                if (log.isDebugEnabled()) {
                    log.debug("No DataSource definitions found for initialization..");
                }
                return dataSourceInformations;
            }

            for (String dsName : dataSourcesNames) {

                if (dsName == null) {
                    continue;
                }
                DataSourceInformation information =
                        DataSourceInformationFactory.
                                createDataSourceInformation(dsName, dsProperties);
                if (information == null) {
                    continue;
                }
                dataSourceInformations.add(information);
            }
            return dataSourceInformations;
        }

    }