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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.security 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.io.OutputStream
      java.io.FilterOutputStream
         java.security.DigestOutputStream

DigestOutputStream
public class DigestOutputStream extends FilterOutputStream (Code)
A transparent stream that updates the associated message digest using the bits going through the stream.

To complete the message digest computation, call one of the digest methods on the associated message digest after your calls to one of this digest ouput stream's DigestOutputStream.write(int) write methods.

It is possible to turn this stream on or off (see DigestOutputStream.on(boolean) on ). When it is on, a call to one of the write methods results in an update on the message digest. But when it is off, the message digest is not updated. The default is for the stream to be on.
See Also:   MessageDigest
See Also:   DigestInputStream
version:
   1.28 00/02/02
author:
   Benjamin Renaud



Field Summary
protected  MessageDigestdigest
     The message digest associated with this stream.

Constructor Summary
public  DigestOutputStream(OutputStream stream, MessageDigest digest)
     Creates a digest output stream, using the specified output stream and message digest.

Method Summary
public  MessageDigestgetMessageDigest()
     Returns the message digest associated with this stream.
public  voidon(boolean on)
     Turns the digest function on or off.
public  voidsetMessageDigest(MessageDigest digest)
     Associates the specified message digest with this stream.
public  StringtoString()
     Prints a string representation of this digest output stream and its associated message digest object.
public  voidwrite(int b)
     Updates the message digest (if the digest function is on) using the specified byte, and in any case writes the byte to the output stream.
public  voidwrite(byte[] b, int off, int len)
     Updates the message digest (if the digest function is on) using the specified subarray, and in any case writes the subarray to the output stream.

Field Detail
digest
protected MessageDigest digest(Code)
The message digest associated with this stream.




Constructor Detail
DigestOutputStream
public DigestOutputStream(OutputStream stream, MessageDigest digest)(Code)
Creates a digest output stream, using the specified output stream and message digest.
Parameters:
  stream - the output stream.
Parameters:
  digest - the message digest to associate with this stream.




Method Detail
getMessageDigest
public MessageDigest getMessageDigest()(Code)
Returns the message digest associated with this stream. the message digest associated with this stream.
See Also:   DigestOutputStream.setMessageDigest(java.security.MessageDigest)



on
public void on(boolean on)(Code)
Turns the digest function on or off. The default is on. When it is on, a call to one of the write methods results in an update on the message digest. But when it is off, the message digest is not updated.
Parameters:
  on - true to turn the digest function on, false to turn itoff.



setMessageDigest
public void setMessageDigest(MessageDigest digest)(Code)
Associates the specified message digest with this stream.
Parameters:
  digest - the message digest to be associated with this stream.
See Also:   DigestOutputStream.getMessageDigest()



toString
public String toString()(Code)
Prints a string representation of this digest output stream and its associated message digest object.



write
public void write(int b) throws IOException(Code)
Updates the message digest (if the digest function is on) using the specified byte, and in any case writes the byte to the output stream. That is, if the digest function is on (see DigestOutputStream.on(boolean) on ), this method calls update on the message digest associated with this stream, passing it the byte b. This method then writes the byte to the output stream, blocking until the byte is actually written.
Parameters:
  b - the byte to be used for updating and writing to theoutput stream.
exception:
  IOException - if an I/O error occurs.
See Also:   MessageDigest.update(byte)



write
public void write(byte[] b, int off, int len) throws IOException(Code)
Updates the message digest (if the digest function is on) using the specified subarray, and in any case writes the subarray to the output stream. That is, if the digest function is on (see DigestOutputStream.on(boolean) on ), this method calls update on the message digest associated with this stream, passing it the subarray specifications. This method then writes the subarray bytes to the output stream, blocking until the bytes are actually written.
Parameters:
  b - the array containing the subarray to be used for updatingand writing to the output stream.
Parameters:
  off - the offset into b of the first byte tobe updated and written.
Parameters:
  len - the number of bytes of data to be updated and writtenfrom b, starting at offset off.
exception:
  IOException - if an I/O error occurs.
See Also:   MessageDigest.update(byte[]intint)



Fields inherited from java.io.FilterOutputStream
protected OutputStream out(Code)(Java Doc)

Methods inherited from java.io.FilterOutputStream
public void close() throws IOException(Code)(Java Doc)
public void flush() throws IOException(Code)(Java Doc)
public void write(int b) throws IOException(Code)(Java Doc)
public void write(byte b) throws IOException(Code)(Java Doc)
public void write(byte b, int off, int len) throws IOException(Code)(Java Doc)

Methods inherited from java.io.OutputStream
public void close() throws IOException(Code)(Java Doc)
public void flush() throws IOException(Code)(Java Doc)
abstract public void write(int b) throws IOException(Code)(Java Doc)
public void write(byte b) throws IOException(Code)(Java Doc)
public void write(byte b, int off, int len) throws IOException(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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