org.mycore.datamodel.ifs
Class MCRFileContentTypeFactory

java.lang.Object
  org.mycore.datamodel.ifs.MCRFileContentTypeFactory

public class MCRFileContentTypeFactory
extends Object

Provides methods to get the file content type with a given ID, or to detect the file content type by providing file content header and filename. The list of known file content types is defined in an XML file that is specified in the property MCR.IFS.FileContentTypes.DefinitionFile, and that file is searched in the CLASSPATH directories or JAR files. The class that implements the file content type detector must be specified by the configuration property MCR.IFS.FileContentTypes.DetectorClass.

Author:

Frank Lützenkirchen

Field Summary

protected static MCRFileContentType	defaultType The default file content type if unknown
protected static MCRFileContentTypeDetector	detector The file content type detector implementation that is used
protected static Hashtable	typesTable Table for looking up all file content types by ID

Constructor Summary

MCRFileContentTypeFactory()

Method Summary

static MCRFileContentType	detectType(String filename, byte[] header) Detects the file content type from filename and file content header.
static MCRFileContentType	getDefaultType() Returns the default file content type to be used if content type is unknown
static MCRFileContentType	getType(String ID) Returns the file content type with the given ID
static boolean	isTypeAvailable(String ID) Returns true if the file content type with the given ID is configured

Methods inherited from class java.lang.Object

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

Field Detail

typesTable

protected static Hashtable typesTable

Table for looking up all file content types by ID

defaultType

protected static MCRFileContentType defaultType

The default file content type if unknown

detector

protected static MCRFileContentTypeDetector detector

The file content type detector implementation that is used

Constructor Detail

MCRFileContentTypeFactory

public MCRFileContentTypeFactory()

Method Detail

getType

public static MCRFileContentType getType(String ID)
                                  throws MCRConfigurationException

Returns the file content type with the given ID

Parameters:

ID - The non-null ID of the content type that should be returned

Returns:

The file content type with the given ID

Throws:

MCRConfigurationException - if no such file content type is known in the system

isTypeAvailable

public static boolean isTypeAvailable(String ID)
                               throws MCRConfigurationException

Returns true if the file content type with the given ID is configured

Parameters:

ID - The non-null ID of the content type that should be returned

Returns:

true if content type is available, else false

Throws:

MCRConfigurationException

getDefaultType

public static MCRFileContentType getDefaultType()

Returns the default file content type to be used if content type is unknown

detectType

public static MCRFileContentType detectType(String filename,
                                            byte[] header)

Detects the file content type from filename and file content header.

Parameters:

filename - the name of the file, may be null

header - the first bytes of the file header, may be null or empty

Returns:

the file content type detected, or the default file content type if detection was not possible