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.carbondata.core.reader;
  
  import java.io.IOException;
  
  import org.apache.carbondata.format.FileFooter;
  
  /**
   * Reads the metadata from fact file in org.apache.carbondata.format.FileFooter thrift object
   */
  public class CarbonFooterReader {
  
    //Fact file path
    private String filePath;
  
    //From which offset of file this metadata should be read
    private long offset;
  
    public CarbonFooterReader(String filePath, long offset) {
  
      this.filePath = filePath;
      this.offset = offset;
    }
  
    /**
     * It reads the metadata in FileFooter thrift object format.
     *
     * @return
     * @throws IOException
     */
    public FileFooter readFooter() throws IOException {
      ThriftReader thriftReader = openThriftReader(filePath);
      thriftReader.open();
      //Set the offset from where it should read
      thriftReader.setReadOffset(offset);
      FileFooter footer = (FileFooter) thriftReader.read();
      thriftReader.close();
      return footer;
    }
  
    /**
     * Open the thrift reader
     *
     * @param filePath
     * @return
     * @throws IOException
     */
    private ThriftReader openThriftReader(String filePath) {
      return new ThriftReader(filePath, FileFooter::new);
    }
  
  }
  