com.google.cloud.dataflow.sdk.util.ExposedByteArrayInputStream Maven / Gradle / Ivy

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Google Cloud Dataflow Java SDK provides a simple, Java-based interface for processing virtually any size data using Google cloud resources. This artifact includes entire Dataflow Java SDK.

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * Licensed 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 com.google.cloud.dataflow.sdk.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;

/**
 * {@link ByteArrayInputStream} that allows accessing the entire internal buffer without copying.
 */
public class ExposedByteArrayInputStream extends ByteArrayInputStream{

  public ExposedByteArrayInputStream(byte[] buf) {
    super(buf);
  }

  /** Read all remaining bytes.
   * @throws IOException */
  public byte[] readAll() throws IOException {
    if (pos == 0 && count == buf.length) {
      pos = count;
      return buf;
    }
    byte[] ret = new byte[count - pos];
    super.read(ret);
    return ret;
  }

  @Override
  public void close() {
    try {
      super.close();
    } catch (IOException exn) {
      throw new RuntimeException("Unexpected IOException closing ByteArrayInputStream", exn);
    }
  }
}