src/java_tools/singlejar/java/com/google/devtools/build/zip/CountingOutputStream.java

// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.zip;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/** An OutputStream that counts the number of bytes written. */
final class CountingOutputStream extends FilterOutputStream {

  private long count;

  /**
   * Wraps another output stream, counting the number of bytes written.
   *
   * @param out the output stream to be wrapped
   */
  public CountingOutputStream(OutputStream out) {
    super(out);
  }

  /** Returns the number of bytes written. */
  public long getCount() {
    return count;
  }

  @Override public void write(int b) throws IOException {
    out.write(b);
    count++;
  }

  @Override public void write(byte[] b) throws IOException {
    out.write(b);
    count += b.length;
  }

  @Override public void write(byte[] b, int off, int len) throws IOException {
    out.write(b, off, len);
    count += len;
  }
}