edu.udo.cs.miningmart.m4.core
Class ConceptualDatatypes

java.lang.Object
  edu.udo.cs.miningmart.m4.core.ConceptualDatatypes

All Implemented Interfaces:

ConceptualDatatypes

public class ConceptualDatatypes
extends java.lang.Object
implements ConceptualDatatypes

This class represents the conceptual datatypes stored in the M4 model and takes care of mapping between the ID and name representations. One instance of this class (e.g. static in class BaseAttribute is sufficient, adding/changing the predefined set of conceptual datatypes at runtime is not supported.

Version:

$Id: ConceptualDatatypes.java,v 1.5 2006/09/27 14:59:59 euler Exp $

Author:

Martin Scholz

Field Summary

static java.lang.String	ATTRIB_DATATYPE_ID Database attribute name storing the datatype IDs
static java.lang.String	ATTRIB_DATATYPE_NAME Database attribute name storing the datatype names
static java.lang.String	M4_TABLE_NAME Name of the M4 table mapping IDs to conceptual datatype names

Fields inherited from interface edu.udo.cs.miningmart.m4.ConceptualDatatypes

CDT_BINARY, CDT_CATEGORIAL, CDT_CONSTANT, CDT_KEYATTRIB, CDT_NOMINAL, CDT_NUMERIC, CDT_ORDINAL, CDT_SCALAR, CDT_SPATIAL, CDT_TIME, CDT_TIMEGROUP, CDTYPES, datatypeCompatibilities

Constructor Summary

ConceptualDatatypes(DB db)

Method Summary

static boolean	checkDatatypeCompatibility(java.lang.String datatype1, java.lang.String datatype2) For two given conceptual datatypes, it is checked whether the first is more general than the second.
long	getIdForName(java.lang.String name)
java.lang.String	getNameForId(long id)
static java.lang.String	guessConceptualTypeGivenRelationalType(java.lang.String relationalTypeName) Static method to guess the conceptual datatype given a relational datatype.

Methods inherited from class java.lang.Object

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

Field Detail

M4_TABLE_NAME

public static final java.lang.String M4_TABLE_NAME

Name of the M4 table mapping IDs to conceptual datatype names

See Also:

Constant Field Values

ATTRIB_DATATYPE_ID

public static final java.lang.String ATTRIB_DATATYPE_ID

Database attribute name storing the datatype IDs

See Also:

Constant Field Values

ATTRIB_DATATYPE_NAME

public static final java.lang.String ATTRIB_DATATYPE_NAME

Database attribute name storing the datatype names

See Also:

Constant Field Values

Constructor Detail

ConceptualDatatypes

public ConceptualDatatypes(DB db)
                    throws M4Exception,
                           DbConnectionClosed

Throws:

M4Exception

DbConnectionClosed

Method Detail

checkDatatypeCompatibility

public static boolean checkDatatypeCompatibility(java.lang.String datatype1,
                                                 java.lang.String datatype2)

For two given conceptual datatypes, it is checked whether the first is more general than the second.

Parameters:

datatype1 - the first given datatype

datatype2 - the second given datatype

Returns:

TRUE iff the first datatype is more general than the second.

guessConceptualTypeGivenRelationalType

public static java.lang.String guessConceptualTypeGivenRelationalType(java.lang.String relationalTypeName)
                                                               throws M4Exception

Static method to guess the conceptual datatype given a relational datatype.

Parameters:

relationalTypeName - the M4 relational data type name

Returns:

the M4 conceptual data type name that is guessed by default

Throws:

M4Exception

getIdForName

public long getIdForName(java.lang.String name)

Specified by:

getIdForName in interface ConceptualDatatypes

Parameters:

name - the name of a conceptual datatype (case senitive)

Returns:

the id representing this datatype or 0 if not found

getNameForId

public java.lang.String getNameForId(long id)

Specified by:

getNameForId in interface ConceptualDatatypes

Parameters:

id - the ID of a conceptual datatype

Returns:

the conceptual datatype's name