ch.randelshofer.activation
Class JAIRecognizer

java.lang.Object
  ch.randelshofer.activation.JAIRecognizer

All Implemented Interfaces:

Recognizer

public class JAIRecognizer
extends java.lang.Object
implements Recognizer

This content type detector uses the JAI (Java Advanced Imaging API) to detect file types.

Version:

1.2 2006-07-20 Reworked for Java 1.5.
1.1 2002-02-12 Return application/octet-stream' for unknown file types.
1.0.1 1999-13-12 Macintosh Runtime for Java crashes when the Java advanced Imaging API is not available.
history 1.0 1998-10-19

Author:

Werner Randelshofer, Hausmatt 10, CH-6405 Immensee, Switzerland.

Field Summary

Fields inherited from interface ch.randelshofer.activation.Recognizer

CONTENT_TYPE_OCTET_STREAM, CONTENT_TYPE_UNKNOWN

Constructor Summary

protected

JAIRecognizer()

Method Summary

com.sun.media.jai.codec.ImageCodec	getCodec(byte[] dataSnippet)
java.lang.String	getContentType(byte[] dataSnippet) Return the base MIME Type of this data.
static JAIRecognizer	getInstance()
int	getMinimalDeterminableDataLength() Return the number of bytes needed to determine the content type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JAIRecognizer

protected JAIRecognizer()

Method Detail

getInstance

public static JAIRecognizer getInstance()

getMinimalDeterminableDataLength

public int getMinimalDeterminableDataLength()

Return the number of bytes needed to determine the content type.

Specified by:

getMinimalDeterminableDataLength in interface Recognizer

getContentType

public java.lang.String getContentType(byte[] dataSnippet)

Return the base MIME Type of this data. This method is expected to ALWAYS return a valid (non-null) MIME Type.

Specified by:

getContentType in interface Recognizer

Parameters:

dataSnippet - the first few bytes of the data file.

Returns:

MIME Type or application/octet-stream' if content type can not be determined.

getCodec

public com.sun.media.jai.codec.ImageCodec getCodec(byte[] dataSnippet)