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CloudGraph(tm) is a suite of Service Data Object (SDO) 2.1 services designed for relational and big-table style "cloud" databases, such as HBase and others.

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/**
 * Copyright 2017 TerraMeta Software, 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://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.cloudgraph.rdb.connect;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.plasma.runtime.ConfigurationConstants;
import org.plasma.runtime.DataAccessProviderName;
import org.plasma.runtime.PlasmaRuntime;
import org.plasma.runtime.Property;
import org.plasma.sdo.access.DataAccessException;

/**
 * Supplies connections using a JNDI registered datasource.
 */
public class JNDIDataSourceProvider implements DataSourceProvder {
  private static final Log log = LogFactory.getLog(JNDIDataSourceProvider.class);
  protected DataSource datasource;

  public JNDIDataSourceProvider() {
    Properties props = new Properties();
    for (Property property : PlasmaRuntime.getInstance()
        .getDataAccessProvider(DataAccessProviderName.JDBC).getProperties()) {
      props.put(property.getName(), property.getValue());
    }

    String datasourceName = props.getProperty(ConfigurationConstants.JDBC_DATASOURCE_NAME);
    if (datasourceName == null)
      throw new DataAccessException("cannot lookup datasource - datasource name property '"
          + ConfigurationConstants.JDBC_DATASOURCE_NAME + "' not found in configuration for "
          + "data access provider '" + DataAccessProviderName.JDBC.name()
          + "' - a fully qualified JNDI name is required");
    try {
      Context initialContext = new InitialContext();
      this.datasource = (DataSource) initialContext.lookup(datasourceName);
      if (this.datasource == null) {
        throw new DataAccessException("cannot lookup datasource '" + datasourceName + "'");
      }
    } catch (NamingException ex) {
      log.error("cannot lookup datasource '" + datasourceName + "'", ex);
      throw new DataAccessException(ex);
    }
  }

  @Override
  public Connection getConnection() throws SQLException {
    return this.datasource.getConnection();
  }

}