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.beam.runners.flink.translation.wrappers;
  
  import java.io.EOFException;
  import java.io.IOException;
  import java.io.InputStream;
  import org.apache.flink.core.memory.DataInputView;
  
  /**
   * Wrapper for {@link DataInputView}. We need this because Flink reads data using a {@link
   * org.apache.flink.core.memory.DataInputView} while Beam {@link org.apache.beam.sdk.coders.Coder}s
   * expect an {@link java.io.InputStream}.
   */
  public class DataInputViewWrapper extends InputStream {
  
    private final DataInputView inputView;
  
    public DataInputViewWrapper(DataInputView inputView) {
      this.inputView = inputView;
    }
  
    @Override
    public int read() throws IOException {
      try {
        return inputView.readUnsignedByte();
      } catch (EOFException e) {
        // translate between DataInput and InputStream,
        // DataInput signals EOF by exception, InputStream does it by returning -1
        return -1;
      }
    }
  
    @Override
    public int read(byte[] b, int off, int len) throws IOException {
      return inputView.read(b, off, len);
    }
  }
  