randomaccessfile.java

来自「gcc3.2.1源代码」· Java 代码 · 共 249 行

// RandomAccessFile.java

/* Copyright (C) 1998, 1999, 2001  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.io;

/**
 * @author Tom Tromey <[e-mail]>
 * @date September 25, 1998 
 */

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * Status: Believe complete and correct to 1.1.
 */

public class RandomAccessFile implements DataOutput, DataInput
{
  public void close () throws IOException
  {
    if (fd.valid())
      fd.close();
  }

  public final FileDescriptor getFD () throws IOException
  {
    if (! fd.valid())
      throw new IOException ();
    return fd;
  }

  public long getFilePointer () throws IOException
  {
    return fd.getFilePointer();
  }

  public long length () throws IOException
  {
    return fd.length();
  }

  public RandomAccessFile (String fileName, String mode) throws IOException
  {
    int fdmode;
    if (mode.compareTo ("r") == 0)
      fdmode = FileDescriptor.READ;
    else if (mode.compareTo ("rw") == 0)
      fdmode = FileDescriptor.READ | FileDescriptor.WRITE;
    else
      throw new IllegalArgumentException ("invalid mode: " + mode);

    SecurityManager s = System.getSecurityManager();
    if (s != null)
      {
	s.checkRead(fileName);
	if ((fdmode & FileDescriptor.WRITE) != 0)
	  s.checkWrite(fileName);
      }

    fd = new FileDescriptor (fileName, fdmode);
    out = new DataOutputStream (new FileOutputStream (fd));
    in = new DataInputStream (new FileInputStream (fd));
  }

  public RandomAccessFile (File file, String mode) throws IOException
  {
    this (file.getPath(), mode);
  }

  public int read () throws IOException
  {
    return in.read();
  }

  public int read (byte[] buffer) throws IOException
  {
    return in.read(buffer);
  }

  public int read (byte[] buffer, int offset, int count) throws IOException
  {
    return in.read(buffer, offset, count);
  }

  public final boolean readBoolean () throws IOException
  {
    return in.readBoolean();
  }

  public final byte readByte () throws IOException
  {
    return in.readByte();
  }

  public final char readChar () throws IOException
  {
    return in.readChar();
  }

  public final double readDouble () throws IOException
  {
    return in.readDouble();
  }

  public final float readFloat () throws IOException
  {
    return in.readFloat();
  }

  public final void readFully (byte[] buffer) throws IOException
  {
    in.readFully(buffer);
  }

  public final void readFully (byte[] buffer, int offset, int count)
    throws IOException
  {
    in.readFully(buffer, offset, count);
  }

  public final int readInt () throws IOException
  {
    return in.readInt();
  }

  public final String readLine () throws IOException
  {
    return in.readLine();
  }

  public final long readLong () throws IOException
  {
    return in.readLong();
  }

  public final short readShort () throws IOException
  {
    return in.readShort();
  }

  public final int readUnsignedByte () throws IOException
  {
    return in.readUnsignedByte();
  }

  public final int readUnsignedShort () throws IOException
  {
    return in.readUnsignedShort();
  }

  public final String readUTF () throws IOException
  {
    return in.readUTF();
  }

  public void seek (long pos) throws IOException
  {
    fd.seek(pos, FileDescriptor.SET, false);
  }

  public int skipBytes (int count) throws IOException
  {
    return count <= 0 ? 0 : fd.seek(count, FileDescriptor.CUR, true);
  }

  public void write (int oneByte) throws IOException
  {
    out.write(oneByte);
  }

  public void write (byte[] buffer) throws IOException
  {
    out.write(buffer);
  }

  public void write (byte[] buffer, int offset, int count) throws IOException
  {
    out.write(buffer, offset, count);
  }

  public final void writeBoolean (boolean val) throws IOException
  {
    out.writeBoolean(val);
  }

  public final void writeByte (int v) throws IOException
  {
    out.writeByte(v);
  }

  public final void writeShort (int v) throws IOException
  {
    out.writeShort(v);
  }

  public final void writeChar (int v) throws IOException
  {
    out.writeChar(v);
  }

  public final void writeInt (int v) throws IOException
  {
    out.writeInt(v);
  }

  public final void writeLong (long v) throws IOException
  {
    out.writeLong(v);
  }

  public final void writeFloat (float v) throws IOException
  {
    out.writeFloat(v);
  }

  public final void writeDouble (double v) throws IOException
  {
    out.writeDouble(v);
  }

  public final void writeBytes (String s) throws IOException
  {
    out.writeBytes(s);
  }

  public final void writeChars (String s) throws IOException
  {
    out.writeChars(s);
  }
  
  public final void writeUTF (String s) throws IOException
  {
    out.writeUTF(s);
  }


  // The underlying file.
  private FileDescriptor fd;
  // The corresponding input and output streams.
  private DataOutputStream out;
  private DataInputStream in;
}