be.SIRAPRISE.typeimplementations

Class DbmsRelationImplementation

java.lang.Object

be.SIRAPRISE.typeimplementations.AbstractTypeImplementation_V0105

be.SIRAPRISE.typeimplementations.AbstractJavaBackedTypeImplementation_V0105

be.SIRAPRISE.typeimplementations.DbmsRelationImplementation

All Implemented Interfaces:

PossRepImplementation, PossRepImplementation_V0105, java.io.Externalizable, java.io.Serializable

public final class DbmsRelationImplementation
extends AbstractJavaBackedTypeImplementation_V0105
implements PossRepImplementation_V0105

The implementation for the (generic) Relation type. Seeing as Relation values currently do not have a physical encoding that can be exposed, there currently is no way for the user to define operators that act upon, or return, relation values.

Author:

Erwin Smout

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static RelationBuffer	TABLE_DEE Return values for explicit commit and rollback commands, to prevent each command from having to allocate new Relation & Heading objects
static RelationBuffer	TABLE_DUM

Constructor Summary

Constructors

Constructor and Description
DbmsRelationImplementation() Deprecated. - this constructor is provided merely as a consequence of the requirements of the Externalizable machinery. If you need an object of this class in your applications, invoking the getInstance() method is the recommended way to get it.

Method Summary

Modifier and Type	Method and Description
ReadOnlyMap<NameIdentifier,TypeDeclaration>	getComponentIdentifierTypeDeclarationsMap() Gets a map of component names to corresponding type declarations.
MyReadOnlyMap<java.lang.String,java.lang.String>	getComponentNameMap() Gets a map of component/type names.
ReadOnlyMap<java.lang.String,TypeDeclaration>	getComponentTypeDeclarationsMap() Gets a map of component names to corresponding type declarations.
ValueBuffer	getComponentValue(java.lang.String componentName, ScalarValueBuffer valueBuffer) "Extracts" a possrep component value out of a value of the type
ValueBuffer	getComponentValue(java.lang.String componentName, ValueBuffer valueBuffer) "Extracts" a possrep component value out of a value of the type
ValueBuffer	getComponentValue(java.lang.String componentName, ValueBuffer valueBuffer, Heading nonScalarHeading) "Extracts" a possrep component value out of a value of the type.
MyReadOnlyMap<java.lang.String,ValueBuffer>	getComponentValues(ValueBuffer valueBuffer, Heading nonScalarHeading) Gets all the possrep component values for a given value of the type this possrep is for
PossRepImplementation	getDefaultPossrepImplementation() Gets the possrep implementation that is to be considered the default for the type.
int	getEncodingLength() Gets the fixed encoding length, if the type employs fixed-length encoding, i.e.
MyReadOnlyMap<NameIdentifier,ValueBuffer>	getIdentifierComponentValues(ValueBuffer valueBuffer, Heading nonScalarHeading) Gets all the possrep component values for a given value of the type this possrep is for
static DbmsRelationImplementation	getInstance() Gets the instance
MyReadOnlySet<PossRepImplementation>	getPossrepImplementations() Gets the set of all PossRepImplementations for this type.
java.lang.String	getPossrepName() Gets the possrep name
boolean	hasVariableLengthEncoding() Determines whether the number of bytes used in the physical encoding is the same for any possible value of the type.
static java.util.Map<java.util.Map<java.lang.String,ValueBuffer>,java.util.Collection<TupleBuffer>>	partition(java.util.Collection<? extends TupleBuffer> r, java.util.Set<java.lang.String> partitioningKeys) Deprecated. - replace with partitionByIdentifier(Collection, Set)
static java.util.Map<java.util.Map<NameIdentifier,ValueBuffer>,java.util.Collection<TupleBuffer>>	partitionByIdentifier(java.util.Collection<? extends TupleBuffer> r, java.util.Set<NameIdentifier> partitioningKeys) Partitions the given tuplelist into map entries (K,L), where : K = a Map of attribute name/value pairs L = A tupleList K has an entry for each attribute name in the set of join attributes
void	readExternal(java.io.ObjectInput in)
ValueBuffer	valueFromComponentValues(java.util.Map<java.lang.String,ValueBuffer> componentValueMap) Returns a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.
RelationBuffer	valueFromExternalRepresentation(java.lang.String value, Heading nonScalarHeading) Convert a value of this possrep's type to internal format.
ValueBuffer	valueFromIdentifierComponentValues(java.util.Map<NameIdentifier,ValueBuffer> componentValueMap) Returns a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.
java.lang.String	valueToEscapedExternalRepresentation(ValueBuffer valueBuffer, Heading nonScalarHeading) Converts a value in internal format to the appropriate textual representation of that value for this possrep.
java.lang.String	valueToEscapedExternalRepresentationVerbose(ValueBuffer valueBuffer, Heading nonScalarHeading) Converts a value in internal format to the appropriate textual representation of that value for this possrep, including the surrounding typename (i.e.
java.lang.String	valueToExternalRepresentation(ValueBuffer valueBuffer, Heading nonScalarHeading) Converts a value in internal format to the appropriate textual representation of that value for this possrep.
java.lang.String	valueToExternalRepresentationVerbose(ValueBuffer valueBuffer, Heading nonScalarHeading) Converts a value in internal format to the appropriate textual representation of that value for this possrep, including the surrounding typename (i.e.
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class be.SIRAPRISE.typeimplementations.AbstractJavaBackedTypeImplementation_V0105

getEqualityOperatorImplementation, getOrderingOperatorImplementation, getPossrepImplementation, getRootTypeName, isOfType

Methods inherited from class be.SIRAPRISE.typeimplementations.AbstractTypeImplementation_V0105

getCommonScalarSuperTypeImplementation, getOrdinalOperatorImplementations, getTypeName, getTypeNameIdentifier, valueFromEscapedExternalRepresentation, valueFromEscapedExternalRepresentation, valueFromEscapedExternalRepresentationWithoutException

Methods inherited from class java.lang.Object

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

Field Detail

TABLE_DEE

public static final RelationBuffer TABLE_DEE

Return values for explicit commit and rollback commands, to prevent each command from having to allocate new Relation & Heading objects

TABLE_DUM

public static final RelationBuffer TABLE_DUM

Constructor Detail

DbmsRelationImplementation

@Deprecated
public DbmsRelationImplementation()

Deprecated. - this constructor is provided merely as a consequence of the requirements of the Externalizable machinery. If you need an object of this class in your applications, invoking the getInstance() method is the recommended way to get it.

Creates the instance

Method Detail

getInstance

public static final DbmsRelationImplementation getInstance()

Gets the instance

Returns:

the instance

partition

@Deprecated
public static java.util.Map<java.util.Map<java.lang.String,ValueBuffer>,java.util.Collection<TupleBuffer>> partition(java.util.Collection<? extends TupleBuffer> r,
                                                                                                                                 java.util.Set<java.lang.String> partitioningKeys)

Deprecated. - replace with partitionByIdentifier(Collection, Set)

Partitions the given tuplelist into map entries (K,L), where : K = a Map of attribute name/value pairs L = A tupleList K has an entry for each attribute name in the set of join attributes

Parameters:

r - the tuple container to be partitioned

partitioningKeys - the set of attribute names that are to appear in the output map's key

Returns:

A map that represents the Tuplelist, "grouped together" per attribute values.

partitionByIdentifier

public static java.util.Map<java.util.Map<NameIdentifier,ValueBuffer>,java.util.Collection<TupleBuffer>> partitionByIdentifier(java.util.Collection<? extends TupleBuffer> r,
                                                                                                                               java.util.Set<NameIdentifier> partitioningKeys)

Partitions the given tuplelist into map entries (K,L), where : K = a Map of attribute name/value pairs L = A tupleList K has an entry for each attribute name in the set of join attributes

Parameters:

r - the tuple container to be partitioned

partitioningKeys - the set of attribute names that are to appear in the output map's key

Returns:

A map that represents the Tuplelist, "grouped together" per attribute values.

getComponentIdentifierTypeDeclarationsMap

public ReadOnlyMap<NameIdentifier,TypeDeclaration> getComponentIdentifierTypeDeclarationsMap()

Description copied from interface: PossRepImplementation_V0105

Gets a map of component names to corresponding type declarations. The keys in the map are the names of the components of this possrep. The values in the map are the type declaration objects corresponding to the named component. The map can be empty, if this is a possrep that does not consist of components.

Specified by:

getComponentIdentifierTypeDeclarationsMap in interface PossRepImplementation_V0105

Returns:

a map of component/type names.

getComponentNameMap

public MyReadOnlyMap<java.lang.String,java.lang.String> getComponentNameMap()

Description copied from interface: PossRepImplementation

Gets a map of component/type names. The keys in the map are the names of the components of this possrep. The values in the map are the typenames corresponding to (the values for) the named component. Since both the keys and the values in the map are all names, they must both be all uppercase. The map can be empty, if this is a possrep that does not consist of components.

Specified by:

getComponentNameMap in interface PossRepImplementation

Returns:

a map of component/type names.

getComponentTypeDeclarationsMap

public ReadOnlyMap<java.lang.String,TypeDeclaration> getComponentTypeDeclarationsMap()

Description copied from interface: PossRepImplementation

Gets a map of component names to corresponding type declarations. The keys in the map are the names of the components of this possrep. The values in the map are the type declaration objects corresponding to the named component. The map can be empty, if this is a possrep that does not consist of components.

Specified by:

getComponentTypeDeclarationsMap in interface PossRepImplementation

Returns:

a map of component/type names.

getComponentValue

public ValueBuffer getComponentValue(java.lang.String componentName,
                                     ScalarValueBuffer valueBuffer)

Description copied from interface: PossRepImplementation

"Extracts" a possrep component value out of a value of the type

Specified by:

getComponentValue in interface PossRepImplementation

Parameters:

componentName - The possrep component Name

valueBuffer - The scalarValueBuffer holding the value of which the possrep's component's value is to be extracted

Returns:

The value of the component in this possrep's representation of the given value

getComponentValue

public ValueBuffer getComponentValue(java.lang.String componentName,
                                     ValueBuffer valueBuffer)

Description copied from interface: PossRepImplementation

"Extracts" a possrep component value out of a value of the type

Specified by:

getComponentValue in interface PossRepImplementation

Parameters:

componentName - The possrep component Name

valueBuffer - The scalarValueBuffer holding the value of which the possrep's component's value is to be extracted

Returns:

The value of the component in this possrep's representation of the given value

getComponentValue

public ValueBuffer getComponentValue(java.lang.String componentName,
                                     ValueBuffer valueBuffer,
                                     Heading nonScalarHeading)

Description copied from interface: PossRepImplementation_V0105

"Extracts" a possrep component value out of a value of the type. This method supersedes the getComponentValue() method of the PossRepImplementation14 interface.

Specified by:

getComponentValue in interface PossRepImplementation_V0105

Parameters:

componentName - The possrep component Name

valueBuffer - The scalarValueBuffer holding the value of which the possrep's component's value is to be extracted

nonScalarHeading - The heading defining the nonScalar type that the value in the (nonscalar) valueBuffer is of.

Returns:

The value of the component in this possrep's representation of the given value

getComponentValues

public MyReadOnlyMap<java.lang.String,ValueBuffer> getComponentValues(ValueBuffer valueBuffer,
                                                                      Heading nonScalarHeading)

Description copied from interface: PossRepImplementation

Gets all the possrep component values for a given value of the type this possrep is for

Specified by:

getComponentValues in interface PossRepImplementation

Parameters:

valueBuffer - The scalarValueBuffer holding the value of which the possrep's component's value is to be extracted

nonScalarHeading - The heading defining the specific nonScalar type, if the type is nonScalar and the value is a body value alone

Returns:

a mapping of all the possrep component values for a given value of the type this possrep is for

getDefaultPossrepImplementation

public PossRepImplementation getDefaultPossrepImplementation()

Description copied from class: AbstractTypeImplementation_V0105

Gets the possrep implementation that is to be considered the default for the type. If the type does not provide any possrep(implementation)s at all, then this method should return null, and this type will be treated as a singleton type.

Specified by:

getDefaultPossrepImplementation in class AbstractTypeImplementation_V0105

Returns:

the possrep implementation that is to be considered the default for the type, or null if the type is a singleton.

getEncodingLength

public int getEncodingLength()

Description copied from class: AbstractTypeImplementation_V0105

Gets the fixed encoding length, if the type employs fixed-length encoding, i.e. if the hasVariableLengthEncoding() method returns 'false'. Types that employ variable-length encodings are required to return a negative value.

Specified by:

getEncodingLength in class AbstractTypeImplementation_V0105

Returns:

the fixed encoding length, if the type employs fixed-length encoding, i.e. if the hasVariableLengthEncoding() method returns 'false'. Types that employ variable-length encodings are required to return a negative value.

getIdentifierComponentValues

public MyReadOnlyMap<NameIdentifier,ValueBuffer> getIdentifierComponentValues(ValueBuffer valueBuffer,
                                                                              Heading nonScalarHeading)

Description copied from interface: PossRepImplementation_V0105

Gets all the possrep component values for a given value of the type this possrep is for

Specified by:

getIdentifierComponentValues in interface PossRepImplementation_V0105

Parameters:

valueBuffer - The scalarValueBuffer holding the value of which the possrep's component's value is to be extracted

nonScalarHeading - The heading defining the specific nonScalar type, if the type is nonScalar and the value is a body value alone

Returns:

a mapping of all the possrep component values for a given value of the type this possrep is for

getPossrepImplementations

public MyReadOnlySet<PossRepImplementation> getPossrepImplementations()

Description copied from class: AbstractTypeImplementation_V0105

Gets the set of all PossRepImplementations for this type.

Specified by:

getPossrepImplementations in class AbstractTypeImplementation_V0105

Returns:

The set of all PossRepImplementations for this type.

getPossrepName

public java.lang.String getPossrepName()

Description copied from interface: PossRepImplementation

Gets the possrep name

Specified by:

getPossrepName in interface PossRepImplementation

Returns:

The possrep name

hasVariableLengthEncoding

public boolean hasVariableLengthEncoding()

Description copied from class: AbstractTypeImplementation_V0105

Determines whether the number of bytes used in the physical encoding is the same for any possible value of the type. E.g. an integer type can always use 4 or 8 bytes for the encodings of its values, a text type can use just the number of byte positions needed.

Specified by:

hasVariableLengthEncoding in class AbstractTypeImplementation_V0105

Returns:

true if the length (in bytes) of the physical space needed to hold an encoding of a value of this type, is the same for all values

readExternal

public void readExternal(java.io.ObjectInput in)

Specified by:

readExternal in interface java.io.Externalizable

valueFromComponentValues

public ValueBuffer valueFromComponentValues(java.util.Map<java.lang.String,ValueBuffer> componentValueMap)

Description copied from interface: PossRepImplementation

Returns a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.

Specified by:

valueFromComponentValues in interface PossRepImplementation

Parameters:

componentValueMap - A Map holding component names and their corresponding values, held in a ValueBuffer.

Returns:

a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.

valueFromExternalRepresentation

public RelationBuffer valueFromExternalRepresentation(java.lang.String value,
                                                      Heading nonScalarHeading)
                                               throws InvalidValueException

Description copied from interface: PossRepImplementation

Convert a value of this possrep's type to internal format. The implementation is responsible for ensuring that the result is within bounds with the possrep's type's minimum or maximum logical size (and thus with the corresponding minimum and maximum physical encoding size). If the type is variable-length, then any length may be chosen for the ByteBuffer returned, as long as the encoding of the value fits within that byteBuffer length. If the encoding of a value takes less bytes than the chosen length, then the remaining bytes must be filled with null bytes (0x00). Failing to obey this rule will subvert certain checksum computations that are done internally by SIRA_PRISE, and thus cause it to possibly produce wrong results. Note that if a type is variable-length, then the first four bytes in the returned ScalarValueBuffer's ByteBuffer must hold the logical length of the value.

Specified by:

valueFromExternalRepresentation in interface PossRepImplementation

Parameters:

value - the value in external format.

nonScalarHeading - The heading defining the specific nonScalar type, if the type is nonScalar and the value is a body value alone

Returns:

the value in internal format.

Throws:

InvalidValueException - If the textual representation does not represent a value of the possrep's type.

valueFromIdentifierComponentValues

public ValueBuffer valueFromIdentifierComponentValues(java.util.Map<NameIdentifier,ValueBuffer> componentValueMap)

Description copied from interface: PossRepImplementation_V0105

Returns a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.

Specified by:

valueFromIdentifierComponentValues in interface PossRepImplementation_V0105

Parameters:

componentValueMap - A Map holding component names and their corresponding values, held in a ValueBuffer.

Returns:

a ValueBuffer holding the value of the type that this PossRepImplementation is for, and that corresponds to the component values given in the componentValueMap argument.

valueToEscapedExternalRepresentation

public java.lang.String valueToEscapedExternalRepresentation(ValueBuffer valueBuffer,
                                                             Heading nonScalarHeading)

Description copied from interface: PossRepImplementation

Converts a value in internal format to the appropriate textual representation of that value for this possrep. In this method, all tokens of the SIRA_PRISE metalanguage must be output in 'escaped' format, i.e. each '(' character in the representation of the value must be represented as the string "\(", each ')' as a "\)" and each '\' as a "\\". Observe that this does NOT apply to the opening and closing parentheses that delimit the value of a component.

Specified by:

valueToEscapedExternalRepresentation in interface PossRepImplementation

Parameters:

valueBuffer - The value in internal format.

nonScalarHeading - The heading defining the specific nonScalar type, if the type the value held in valueBuffer is of, is indeed nonScalar. Can be left null for scalar types, as they are not "defined" by a Heading.

Returns:

The string representation of the given value, for this possrep.

valueToEscapedExternalRepresentationVerbose

public java.lang.String valueToEscapedExternalRepresentationVerbose(ValueBuffer valueBuffer,
                                                                    Heading nonScalarHeading)

Description copied from interface: PossRepImplementation_V0105

Converts a value in internal format to the appropriate textual representation of that value for this possrep, including the surrounding typename (i.e. the integer 1 is rendered as INT(1)). In this method, all tokens of the SIRA_PRISE metalanguage must be output in 'escaped' format, i.e. each '(' character in the representation of the value must be represented as the string "\(", each ')' as a "\)" and each '\' as a "\\". Observe that this does NOT apply to the opening and closing parentheses that delimit the value of a component.

Specified by:

valueToEscapedExternalRepresentationVerbose in interface PossRepImplementation_V0105

Parameters:

valueBuffer - The value in internal format.

nonScalarHeading - The heading defining the specific nonScalar type, if the type the value held in valueBuffer is of, is indeed nonScalar. Can be left null for scalar types, as they are not "defined" by a Heading.

Returns:

The string representation of the given value, for this possrep.

valueToExternalRepresentation

public java.lang.String valueToExternalRepresentation(ValueBuffer valueBuffer,
                                                      Heading nonScalarHeading)

Description copied from interface: PossRepImplementation

Converts a value in internal format to the appropriate textual representation of that value for this possrep.

Specified by:

valueToExternalRepresentation in interface PossRepImplementation

Parameters:

valueBuffer - The value in internal format.

nonScalarHeading - The heading defining the specific nonScalar type, if the type the value held in valueBuffer is of, is indeed nonScalar. Can be left null for scalar types, as they are not "defined" by a Heading.

Returns:

The string representation of the given value, for this possrep.

valueToExternalRepresentationVerbose

public java.lang.String valueToExternalRepresentationVerbose(ValueBuffer valueBuffer,
                                                             Heading nonScalarHeading)

Description copied from interface: PossRepImplementation_V0105

Converts a value in internal format to the appropriate textual representation of that value for this possrep, including the surrounding typename (i.e. the integer 1 is rendered as INT(1)).

Specified by:

valueToExternalRepresentationVerbose in interface PossRepImplementation_V0105

Parameters:

valueBuffer - The value in internal format.

nonScalarHeading - The heading defining the specific nonScalar type, if the type the value held in valueBuffer is of, is indeed nonScalar. Can be left null for scalar types, as they are not "defined" by a Heading.

Returns:

The string representation of the given value, for this possrep.

writeExternal

public void writeExternal(java.io.ObjectOutput out)

Specified by:

writeExternal in interface java.io.Externalizable