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.asterix.external.writer.printer;
  
  import java.io.OutputStream;
  import java.io.PrintStream;
  
  import org.apache.asterix.external.writer.compressor.IExternalFileCompressStreamFactory;
  import org.apache.asterix.external.writer.compressor.NoOpExternalFileCompressStreamFactory;
  import org.apache.asterix.runtime.writer.IExternalPrinter;
  import org.apache.hyracks.algebricks.data.IPrinter;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IValueReference;
  
  public abstract class AbstractTextualExternalPrinter implements IExternalPrinter {
      final IPrinter printer;
      final IExternalFileCompressStreamFactory compressStreamFactory;
      TextualOutputStreamDelegate delegate;
      PrintStream printStream;
  
      AbstractTextualExternalPrinter(IPrinter printer) {
          this(printer, NoOpExternalFileCompressStreamFactory.INSTANCE);
      }
  
      AbstractTextualExternalPrinter(IPrinter printer, final IExternalFileCompressStreamFactory compressStreamFactory) {
          this.printer = printer;
          this.compressStreamFactory = compressStreamFactory;
      }
  
      @Override
      public void open() throws HyracksDataException {
          printer.init();
      }
  
      @Override
      public void newStream(OutputStream outputStream) throws HyracksDataException {
          if (printStream != null) {
              close();
          }
          delegate = new TextualOutputStreamDelegate(compressStreamFactory.createStream(outputStream));
          printStream = new PrintStream(delegate);
      }
  
      @Override
      public void print(IValueReference value) throws HyracksDataException {
          printer.print(value.getByteArray(), value.getStartOffset(), value.getLength(), printStream);
          afterPrint();
          delegate.checkError();
      }
  
      abstract void afterPrint() throws HyracksDataException;
  
      @Override
      public void close() throws HyracksDataException {
          if (printStream != null) {
              printStream.close();
              printStream = null;
              delegate.checkError();
              delegate = null;
          }
      }
  }
  