ch.randelshofer.activation
Interface Recognizer

All Known Implementing Classes:

AmigaGuideRecognizer, IFFRecognizer, JAIRecognizer, MagicRecognizer, MultiRecognizer, RIFFRecognizer, URLConnectionRecognizer, ZipRecognizer

public interface Recognizer

A recognizer is able to guess the data type of a data stream by inspecting a few bytes at the beginning of the stream.

Version:

1.1 2002-02-12 Return 'application/octet-stream' when file type can not be determined.
1.0 1999-10-19

Author:

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

Field Summary

static java.lang.String	CONTENT_TYPE_OCTET_STREAM This value is returned by #getContentType(byte[]) when the recognizer was not able to determine the content type of the data snippet.
static java.lang.String	CONTENT_TYPE_UNKNOWN This value is returned by #getContentType(byte[]) when the recognizer was not able to determine the content type of the data snippet.

Method Summary

java.lang.String	getContentType(byte[] dataSnippet) Return the base MIME Type of this data.
int	getMinimalDeterminableDataLength() Return the number of bytes needed to determine the content type.

Field Detail

CONTENT_TYPE_UNKNOWN

static final java.lang.String CONTENT_TYPE_UNKNOWN

This value is returned by #getContentType(byte[]) when the recognizer was not able to determine the content type of the data snippet.

See Also:

Constant Field Values

CONTENT_TYPE_OCTET_STREAM

static final java.lang.String CONTENT_TYPE_OCTET_STREAM

This value is returned by #getContentType(byte[]) when the recognizer was not able to determine the content type of the data snippet.

See Also:

Constant Field Values

Method Detail

getMinimalDeterminableDataLength

int getMinimalDeterminableDataLength()

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

getContentType

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.

Parameters:

dataSnippet - the first few bytes of the data file.

Returns:

MIME Type or "application/octet-stream" when file type can not be determined.