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Miscellaneous Utilities (Pure Java)

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/*
 * Copyright (c) 2019 by Andrew Charneski.
 *
 * The author 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 com.simiacryptus.util.io;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TeeInputStream extends InputStream {

  private final OutputStream cache;
  private final InputStream inputStream;

  public TeeInputStream(final InputStream inputStream, final OutputStream cache) {
    this.inputStream = inputStream;
    this.cache = cache;
  }

  @Override
  public int available() throws IOException {
    return inputStream.available();
  }

  @Override
  public void close() throws IOException {
    inputStream.close();
    cache.close();
  }

  @Override
  public int read() throws IOException {
    final int read = inputStream.read();
    cache.write(read);
    return read;
  }

  @Override
  public int read(@Nonnull final byte[] b) throws IOException {
    final int read = inputStream.read(b);
    if (read > 0) {
      cache.write(b);
    }
    return read;
  }

  @Override
  public int read(@Nonnull final byte[] b, final int off, final int len) throws IOException {
    final int read = inputStream.read(b, off, len);
    if (read > 0) {
      cache.write(b, off, read);
    }
    return read;
  }
}