Android Open Source - base-android-utils Reader

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License

The source code is released under:

Apache License

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Java Source Code

package me.pc.mobile.helper.v14.files;
/*from   ww w. j av  a  2s  .com*/
import me.pc.mobile.helper.v14.util.IoUtils;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;

public final class Reader {

  private Reader() {}

  // =========================================================================
  // Read file from external storage - uses the Java API for files
  // =========================================================================
  public static String read(String filename, String csName)
      throws IOException {
    final Charset cs = Charset.forName(csName);
    final byte[] ba = readFile(filename, new InputStreamAction());
    return cs.newDecoder().decode(ByteBuffer.wrap(ba)).toString();
  }

  public static byte[] read(String filename) throws IOException {
    return readFile(filename, new InputStreamAction());
  }

  private static byte[] readFile(String filename,
      InputStreamAction action) throws IOException {
    InputStream stream = new FileInputStream(filename);
    try {
      return action.useStream(stream);
    } finally {
      IoUtils.closeSilently(stream);
    }
  }
}

class InputStreamAction {

  /**
   * Based on code by Skeet for reading a file to a string :
   * http://stackoverflow.com/a/326531/281545
   *
   * @param stream
   * @return
   * @throws IOException
   */
  byte[] useStream(InputStream stream) throws IOException {
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final int length = 8192;
    byte[] buffer = new byte[length];
    int read;
    while ((read = stream.read(buffer, 0, length)) > 0) {
      baos.write(buffer, 0, read);
    }
    return baos.toByteArray();
  }
}

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