FileByteIterator.java

/*
 * 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 gobblin.source.extractor.filebased;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.NoSuchElementException;

import com.google.common.base.Throwables;


public class FileByteIterator implements Iterator<Byte> {

  private BufferedInputStream bufferedInputStream;

  public FileByteIterator(InputStream inputStream) {
    this.bufferedInputStream = new BufferedInputStream(inputStream);
  }

  @Override
  public boolean hasNext() {
    try {
      return this.bufferedInputStream.available() > 0;
    } catch (IOException e) {
      throw Throwables.propagate(e);
    }
  }

  @Override
  public Byte next() {
    try {
      if (this.hasNext()) {
        return (byte) this.bufferedInputStream.read();
      }
      throw new NoSuchElementException("No more data left in the file");
    } catch (IOException e) {
      throw Throwables.propagate(e);
    }
  }

  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }
}