content: /*
   * 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.calcite.avatica;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  /**
   * Driver version information.
   *
   * <p>Each driver implementation must provide an instance of this class, in
   * order to implement {@link UnregisteredDriver#createDriverVersion()}.</p>
   *
   * <p>There are two typical ways for a driver to instantiate its version
   * information:</p>
   *
   * <ul>
   *
   * <li>A driver might create a subclass in a with a constructor that provides
   * all of the arguments for the base class. The instance is held in a separate
   * file, so that that version information can be generated.</li>
   *
   * <li>A driver might store the version information in a .properties file and
   * load it using {@link #load}.</li>
   *
   * </ul>
   */
  public class DriverVersion {
    public final int majorVersion;
    public final int minorVersion;
    public final String name;
    public final String versionString;
    public final String productName;
    public final String productVersion;
    public final boolean jdbcCompliant;
    public final int databaseMajorVersion;
    public final int databaseMinorVersion;
  
    /** Creates a DriverVersion. */
    public DriverVersion(
        String name,
        String versionString,
        String productName,
        String productVersion,
        boolean jdbcCompliant,
        int majorVersion,
        int minorVersion,
        int databaseMajorVersion,
        int databaseMinorVersion) {
      this.majorVersion = majorVersion;
      this.minorVersion = minorVersion;
      this.name = name;
      this.versionString = versionString;
      this.productName = productName;
      this.productVersion = productVersion;
      this.jdbcCompliant = jdbcCompliant;
      this.databaseMajorVersion = databaseMajorVersion;
      this.databaseMinorVersion = databaseMinorVersion;
    }
  
    /** Loads a driver version from a properties file, read from the classpath.
     * The arguments provide defaults if the properties cannot be loaded.
     *
     * @param driverClass Class of driver; used to find resource
     * @param resourceName Name of resource file
     * @param driverName Fallback name of driver
     * @param driverVersion Fallback version of driver
     * @param productName Fallback product name
     * @param productVersion Fallback product version
     * @return A populated driver version object, never null
     */
    public static DriverVersion load(
        Class<? extends UnregisteredDriver> driverClass,
        String resourceName,
        String driverName,
        String driverVersion,
        String productName,
        String productVersion) {
      boolean jdbcCompliant = true;
      int majorVersion = 0;
      int minorVersion = 0;
      int databaseMajorVersion = 0;
      int databaseMinorVersion = 0;
      try (InputStream inStream =
            driverClass.getClassLoader().getResourceAsStream(resourceName)) {
        if (inStream != null) {
          final Properties properties = new Properties();
          properties.load(inStream);
          driverName = properties.getProperty("driver.name");
          driverVersion = properties.getProperty("driver.version");
          productName = properties.getProperty("product.name");
          productVersion = properties.getProperty("product.version");
          jdbcCompliant =
              Boolean.valueOf(properties.getProperty("jdbc.compliant"));
          String[] s = driverVersion.replaceAll("-.*$", "").split("\\.");
          final int major = Integer.parseInt(s[0]);
          final int minor = Integer.parseInt(s[1]);
          try {
            majorVersion =
                Integer.parseInt(properties.getProperty("driver.version.major"));
          } catch (NumberFormatException e) {
            majorVersion = major;
          }
          try {
            minorVersion =
                Integer.parseInt(properties.getProperty("driver.version.minor"));
          } catch (NumberFormatException e) {
            minorVersion = minor;
          }
          try {
            databaseMajorVersion =
                Integer.parseInt(properties.getProperty("database.version.major"));
          } catch (NumberFormatException e) {
            databaseMajorVersion = major;
          }
          try {
            databaseMinorVersion =
                Integer.parseInt(properties.getProperty("database.version.minor"));
          } catch (NumberFormatException e) {
            databaseMinorVersion = minor;
          }
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
      return new DriverVersion(
          driverName, driverVersion, productName, productVersion,
          jdbcCompliant, majorVersion, minorVersion, databaseMajorVersion,
          databaseMinorVersion);
    }
  }
  
  // End DriverVersion.java
  