org.teiid.core.types

Class DataTypeManager

java.lang.Object

org.teiid.core.types.DataTypeManager

public class DataTypeManager
extends Object

This class manages data type, conversions between data types, and comparators for data types. In the future other data type information may be managed here.

In general, methods are provided to refer to types either by Class, or by Class name. The benefit of the Class name option is that the user does not need to load the Class object, which may not be in the classpath. The advantage of the Class option is speed.

TODO: refactor the string/class/code into an enum

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DataTypeManager.DataTypeAliases
static class	DataTypeManager.DefaultDataClasses
static class	DataTypeManager.DefaultDataTypes
static class	DataTypeManager.DefaultTypeCodes
static class	DataTypeManager.WeakReferenceHashedValueCache<T>

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARRAY_SUFFIX
static String	COLLATION_LOCALE
static String	DEFAULT_COLLATION
static int	MAX_LOB_MEMORY_BYTES
static int	MAX_STRING_LENGTH
static int	MAX_TYPE_CODE
static int	MAX_VARBINARY_BYTES
static boolean	PAD_SPACE
static boolean	USE_VALUE_CACHE

Method Summary

Modifier and Type	Method and Description
static Object	convertToRuntimeType(Object value, boolean allConversions) Convert the value to the probable runtime type.
static Class<?>	determineDataTypeClass(Object value) Take an object and determine the MetaMatrix data type.
static Set<Class<?>>	getAllDataTypeClasses()
static Set<String>	getAllDataTypeNames() Get a set of all data type names.
static Class<?>	getArrayType(Class<?> classType)
static String	getCanonicalString(String value)
static <T> T	getCanonicalValue(T value)
static Class<?>	getClass(int code)
static String	getComponentType(String srcType)
static Class<?>	getDataTypeClass(String name) Get data type class.
static String	getDataTypeName(Class<?> typeClass)
static void	getImplicitConversions(String type, Collection<String> result)
static Class<?>	getRuntimeType(Class<?> c)
static Transform	getTransform(Class<?> sourceType, Class<?> targetType) Get a data value transformation between the sourceType and the targetType.
static Transform	getTransform(String sourceTypeName, String targetTypeName) Get a data value transformation between the sourceType with given name and the targetType of given name.
static int	getTypeCode(Class<?> source)
static boolean	hasLength(String typeName) Return true if the type may be defined with a length
static boolean	isArrayType(String name)
static boolean	isExplicitConversion(String srcType, String tgtType)
static boolean	isHashable(Class<?> type)
static boolean	isImplicitConversion(String srcType, String tgtType)
static boolean	isLOB(Class<?> type) Is the supplied class type a LOB based data type?
static boolean	isLOB(String type)
static boolean	isNonComparable(String type)
static boolean	isTransformable(Class<?> sourceType, Class<?> targetType) Does a transformation exist between the source and target type?
static boolean	isTransformable(String sourceTypeName, String targetTypeName) Does a transformation exist between the source and target type of given names? The Class for source and target type are not needed to do this lookup.
static boolean	isValueCacheEnabled()
static int	nextPowOf2(int val)
static void	setValueCacheEnabled(boolean enabled)
static Object	transformValue(Object value, Class<?> targetClass)
static Object	transformValue(Object value, Class<?> sourceType, Class<?> targetClass)

Methods inherited from class java.lang.Object

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

Field Detail

ARRAY_SUFFIX

public static final String ARRAY_SUFFIX

See Also:

Constant Field Values

USE_VALUE_CACHE

public static final boolean USE_VALUE_CACHE

PAD_SPACE

public static final boolean PAD_SPACE

DEFAULT_COLLATION

public static final String DEFAULT_COLLATION

See Also:

Constant Field Values

COLLATION_LOCALE

public static final String COLLATION_LOCALE

MAX_STRING_LENGTH

public static final int MAX_STRING_LENGTH

MAX_VARBINARY_BYTES

public static final int MAX_VARBINARY_BYTES

MAX_LOB_MEMORY_BYTES

public static final int MAX_LOB_MEMORY_BYTES

MAX_TYPE_CODE

public static final int MAX_TYPE_CODE

See Also:

Constant Field Values

Method Detail

nextPowOf2

public static int nextPowOf2(int val)

getTypeCode

public static int getTypeCode(Class<?> source)

getClass

public static Class<?> getClass(int code)

getAllDataTypeNames

public static Set<String> getAllDataTypeNames()

Get a set of all data type names.

Returns:

Set of data type names (String)

getAllDataTypeClasses

public static Set<Class<?>> getAllDataTypeClasses()

getDataTypeClass

public static Class<?> getDataTypeClass(String name)

Get data type class.
IMPORTANT: only valid for default runtime types

Parameters:

name - Data type name

Returns:

Data type class

isArrayType

public static boolean isArrayType(String name)

getDataTypeName

public static String getDataTypeName(Class<?> typeClass)

determineDataTypeClass

public static Class<?> determineDataTypeClass(Object value)

Take an object and determine the MetaMatrix data type. In most cases, this is simply the class of the object. Some special cases are when the value is of type Object or Null.

getTransform

public static Transform getTransform(Class<?> sourceType,
                                     Class<?> targetType)

Get a data value transformation between the sourceType and the targetType.

Parameters:

sourceType - Incoming value type

targetType - Outgoing value type

Returns:

A transform if one exists, null otherwise

getTransform

public static Transform getTransform(String sourceTypeName,
                                     String targetTypeName)

Get a data value transformation between the sourceType with given name and the targetType of given name. The Class for source and target type are not needed to do this lookup.

Parameters:

sourceTypeName - Incoming value type name

targetTypeName - Outgoing value type name

Returns:

A transform if one exists, null otherwise

isTransformable

public static boolean isTransformable(Class<?> sourceType,
                                      Class<?> targetType)

Does a transformation exist between the source and target type?

Parameters:

sourceType - Incoming value type

targetType - Outgoing value type

Returns:

True if a transform exists

isTransformable

public static boolean isTransformable(String sourceTypeName,
                                      String targetTypeName)

Does a transformation exist between the source and target type of given names? The Class for source and target type are not needed to do this lookup.

Parameters:

sourceTypeName - Incoming value type name

targetTypeName - Outgoing value type name

Returns:

True if a transform exists

getImplicitConversions

public static void getImplicitConversions(String type,
                                          Collection<String> result)

isImplicitConversion

public static boolean isImplicitConversion(String srcType,
                                           String tgtType)

getComponentType

public static String getComponentType(String srcType)

isExplicitConversion

public static boolean isExplicitConversion(String srcType,
                                           String tgtType)

isLOB

public static boolean isLOB(Class<?> type)

Is the supplied class type a LOB based data type?

Parameters:

type -

Returns:

true if yes; false otherwise

isLOB

public static boolean isLOB(String type)

convertToRuntimeType

public static Object convertToRuntimeType(Object value,
                                          boolean allConversions)

Convert the value to the probable runtime type.

Parameters:

allConversions - if false only lob conversions will be used

getRuntimeType

public static Class<?> getRuntimeType(Class<?> c)

transformValue

public static Object transformValue(Object value,
                                    Class<?> targetClass)
                             throws TransformationException

Throws:

TransformationException

transformValue

public static Object transformValue(Object value,
                                    Class<?> sourceType,
                                    Class<?> targetClass)
                             throws TransformationException

Throws:

TransformationException

isNonComparable

public static boolean isNonComparable(String type)

setValueCacheEnabled

public static void setValueCacheEnabled(boolean enabled)

isValueCacheEnabled

public static final boolean isValueCacheEnabled()

getCanonicalValue

public static final <T> T getCanonicalValue(T value)

getCanonicalString

public static final String getCanonicalString(String value)

isHashable

public static boolean isHashable(Class<?> type)

getArrayType

public static Class<?> getArrayType(Class<?> classType)

hasLength

public static boolean hasLength(String typeName)

Return true if the type may be defined with a length