Android Open Source - WebImageView File Writing Input Stream

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License

The source code is released under:

Apache License

Java Source Code

/* Copyright (c) 2012 Yelp Inc
 */*from www. j ava 2  s .  c om*/
 * 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.yelp.android.webimageview;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * A wrapper around an InputStream which writes bytes to the provided File as
 * they are read from the stream. Calling close on this stream closes both the
 * file stream and the provided InputStream.
 *
 * @author pretz
 *
 */
public class FileWritingInputStream extends FilterInputStream {

  private static final int BUFFER_SIZE = 4096;
  final OutputStream mOutput;
  final FileDescriptor mFd;

  public FileWritingInputStream(InputStream stream, FileOutputStream file) throws FileNotFoundException {
    super(new BufferedInputStream(stream, BUFFER_SIZE));
    try {
      mFd = file.getFD();
    } catch (IOException e) {
      throw new FileNotFoundException("Could not get file descriptor for given file.");
    }
    mOutput = new BufferedOutputStream(file, BUFFER_SIZE);
  }

  @Override
  public int read(byte[] buffer, int offset, int count) throws IOException {
    int read = super.read(buffer, offset, count);
    if (read >= 0) {
      mOutput.write(buffer, offset, read);
    }
    return read;
  }

  @Override
  public int read(byte[] buffer) throws IOException {
    return this.read(buffer, 0, buffer.length);
  }

  @Override
  public int read() throws IOException {
    int read = super.read();
    if (read >= 0) {
      mOutput.write(read);
    }
    return read;
  }

  @Override
  public void close() throws IOException {
    super.close();
    mOutput.flush();
    mFd.sync();
    mOutput.close();
  }

  @Override
  public boolean markSupported() {
    // Rewinding writing to a file is too complicated.  Just don't support it.
    return false;
  }

  @Override
  public void mark(int readlimit) {
    // Pass, prevent calling through to filtered stream
  }

  @Override
  public synchronized void reset() throws IOException {
    throw new IOException("Reset not supported by " + this.getClass().getSimpleName());
  }

}

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