FileDocCategorySizeDatePackage
RAMOutputStream.javaAPI DocApache Lucene 1.4.33111Tue Mar 30 00:48:06 BST 2004org.apache.lucene.store

RAMOutputStream

public class RAMOutputStream extends OutputStream
A memory-resident {@link OutputStream} implementation.
version
$Id: RAMOutputStream.java,v 1.2 2004/03/29 22:48:05 cutting Exp $

Fields Summary
private RAMFile
file
private int
pointer
Constructors Summary
public RAMOutputStream()
Construct an empty output buffer.


        
    
    this(new RAMFile());
RAMOutputStream(RAMFile f)

    file = f;
Methods Summary
public voidclose()

    super.close();
public voidflushBuffer(byte[] src, int len)

    int bufferNumber = pointer/BUFFER_SIZE;
    int bufferOffset = pointer%BUFFER_SIZE;
    int bytesInBuffer = BUFFER_SIZE - bufferOffset;
    int bytesToCopy = bytesInBuffer >= len ? len : bytesInBuffer;

    if (bufferNumber == file.buffers.size())
      file.buffers.addElement(new byte[BUFFER_SIZE]);

    byte[] buffer = (byte[])file.buffers.elementAt(bufferNumber);
    System.arraycopy(src, 0, buffer, bufferOffset, bytesToCopy);

    if (bytesToCopy < len) {			  // not all in one buffer
      int srcOffset = bytesToCopy;
      bytesToCopy = len - bytesToCopy;		  // remaining bytes
      bufferNumber++;
      if (bufferNumber == file.buffers.size())
        file.buffers.addElement(new byte[BUFFER_SIZE]);
      buffer = (byte[])file.buffers.elementAt(bufferNumber);
      System.arraycopy(src, srcOffset, buffer, 0, bytesToCopy);
    }
    pointer += len;
    if (pointer > file.length)
      file.length = pointer;

    file.lastModified = System.currentTimeMillis();
public longlength()

    return file.length;
public voidreset()
Resets this to an empty buffer.

    try {
      seek(0);
    } catch (IOException e) {                     // should never happen
      throw new RuntimeException(e.toString());
    }

    file.length = 0;
public voidseek(long pos)

    super.seek(pos);
    pointer = (int)pos;
public voidwriteTo(OutputStream out)
Copy the current contents of this buffer to the named output.

    flush();
    final long end = file.length;
    long pos = 0;
    int buffer = 0;
    while (pos < end) {
      int length = BUFFER_SIZE;
      long nextPos = pos + length;
      if (nextPos > end) {                        // at the last buffer
        length = (int)(end - pos);
      }
      out.writeBytes((byte[])file.buffers.elementAt(buffer++), length);
      pos = nextPos;
    }