/*
 * 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.tephra.util;

import com.google.inject.Provider;
import org.apache.hadoop.conf.Configuration;

/**
 * Provides {@code org.apache.hadoop.conf.Configuration} instances, constructed by the correct version used
 * for the runtime.
 */
public class ConfigurationFactory implements Provider<Configuration> {
  private static class ConfigurationProviderFactory extends HBaseVersionSpecificFactory<ConfigurationProvider> {
    @Override
    protected String getHBase96Classname() {
      return "org.apache.tephra.hbase.HBase96ConfigurationProvider";
    }

    @Override
    protected String getHBase98Classname() {
      return "org.apache.tephra.hbase.HBase98ConfigurationProvider";
    }

    @Override
    protected String getHBase10Classname() {
      return "org.apache.tephra.hbase.HBase10ConfigurationProvider";
    }

    @Override
    protected String getHBase11Classname() {
      return "org.apache.tephra.hbase.HBase11ConfigurationProvider";
    }

    @Override
    protected String getHBase10CDHClassname() {
      return "org.apache.tephra.hbase.HBase10ConfigurationProvider";
    }
  }

  private final ConfigurationProvider provider = new ConfigurationProviderFactory().get();

  /**
   * Returns a new {@link org.apache.hadoop.conf.Configuration} instance from the HBase version-specific factory.
   */
  @Override
  public Configuration get() {
    return provider.get();
  }

  /**
   * Returns a new {@link org.apache.hadoop.conf.Configuration} instance from the HBase version-specific factory.
   *
   * @param baseConf additional configuration properties to merge on to the classpath configuration
   * @return the merged configuration
   */
  public Configuration get(Configuration baseConf) {
    return provider.get(baseConf);
  }
}