org.apache.derby.impl.sql.compile
Class TimestampTypeCompiler

java.lang.Object
  org.apache.derby.impl.sql.compile.BaseTypeCompiler
      org.apache.derby.impl.sql.compile.TimestampTypeCompiler

All Implemented Interfaces:

TypeCompiler

public class TimestampTypeCompiler
extends BaseTypeCompiler

Field Summary

Fields inherited from interface org.apache.derby.iapi.sql.compile.TypeCompiler

AVG_OP, BOOLEAN_MAXWIDTH_AS_CHAR, DEFAULT_DECIMAL_PRECISION, DEFAULT_DECIMAL_SCALE, DIVIDE_OP, DOUBLE_MAXWIDTH_AS_CHAR, INT_MAXWIDTH_AS_CHAR, LONGINT_MAXWIDTH_AS_CHAR, MAX_DECIMAL_PRECISION_SCALE, MINUS_OP, MOD_OP, PLUS_OP, REAL_MAXWIDTH_AS_CHAR, SMALLINT_MAXWIDTH_AS_CHAR, SUM_OP, TIMES_OP, TINYINT_MAXWIDTH_AS_CHAR

Constructor Summary

TimestampTypeCompiler()

Method Summary

boolean	compatible(TypeId otherType) Tell whether this type (timestamp) is compatible with the given type.
boolean	convertible(TypeId otherType, boolean forDataTypeFunction) User types are convertible to other user types only if (for now) they are the same type and are being used to implement some JDBC type.
double	estimatedMemoryUsage(DataTypeDescriptor dtd)
int	getCastToCharWidth(DataTypeDescriptor dts) Return the maximum width for this data type when cast to a char type.
java.lang.String	getCorrespondingPrimitiveTypeName() Get the name of the corresponding Java type.
java.lang.String	interfaceName() Get the name of the interface for this type.
(package private) java.lang.String	nullMethodName() Return the method name to get a Derby DataValueDescriptor object of the correct type set to SQL NULL.
boolean	storable(TypeId otherType, ClassFactory cf) User types are storable into other user types that they are assignable to.

Methods inherited from class org.apache.derby.impl.sql.compile.BaseTypeCompiler

dataValueMethodName, generateDataValue, generateNull, getPrimitiveMethodName, getStoredFormatIdFromTypeId, getTypeCompiler, getTypeId, numberConvertible, numberStorable, pushCollationForDataValue, resolveArithmeticOperation, setTypeId, userTypeStorable

Methods inherited from class java.lang.Object

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

Constructor Detail

TimestampTypeCompiler

public TimestampTypeCompiler()

Method Detail

convertible

public boolean convertible(TypeId otherType,
                           boolean forDataTypeFunction)

User types are convertible to other user types only if (for now) they are the same type and are being used to implement some JDBC type. This is sufficient for date/time types; it may be generalized later for e.g. comparison of any user type with one of its subtypes.

Parameters:

otherType - The CompilationType of the other type to compare this type to

forDataTypeFunction - true if this is a type function that requires more liberal behavior (e.g DOUBLE can convert a char but you cannot cast a CHAR to double.

Returns:

true if the types can be converted, false if conversion is not allowed

See Also:

TypeCompiler.convertible(org.apache.derby.iapi.types.TypeId, boolean)

compatible

public boolean compatible(TypeId otherType)

Tell whether this type (timestamp) is compatible with the given type.

Parameters:

otherType - The TypeId of the other type.

Returns:

true if the types are compatible, false if not compatible

storable

public boolean storable(TypeId otherType,
                        ClassFactory cf)

User types are storable into other user types that they are assignable to. The other type must be a subclass of this type, or implement this type as one of its interfaces. Built-in types are also storable into user types when the built-in type's corresponding Java type is assignable to the user type.

Parameters:

otherType - the type of the instance to store into this type.

cf - A ClassFactory

Returns:

true if otherType is storable into this type, else false.

interfaceName

public java.lang.String interfaceName()

Description copied from interface: TypeCompiler

Get the name of the interface for this type. For example, the interface for a SQLInteger is NumberDataValue. The full path name of the type is returned.

Returns:

The name of the interface for this type.

See Also:

TypeCompiler.interfaceName()

getCorrespondingPrimitiveTypeName

public java.lang.String getCorrespondingPrimitiveTypeName()

Description copied from interface: TypeCompiler

Get the name of the corresponding Java type. For numerics and booleans we will get the corresponding Java primitive type. e Each SQL type has a corresponding Java type. When a SQL value is passed to a Java method, it is translated to its corresponding Java type. For example, a SQL Integer will be mapped to a Java int, but a SQL date will be mapped to a java.sql.Date.

Returns:

The name of the corresponding Java primitive type.

See Also:

TypeCompiler.getCorrespondingPrimitiveTypeName()

getCastToCharWidth

public int getCastToCharWidth(DataTypeDescriptor dts)

Description copied from interface: TypeCompiler

Return the maximum width for this data type when cast to a char type.

Parameters:

dts - The associated DataTypeDescriptor for this TypeId.

Returns:

int The maximum width for this data type when cast to a char type.

See Also:

TypeCompiler.getCastToCharWidth(org.apache.derby.iapi.types.DataTypeDescriptor)

estimatedMemoryUsage

public double estimatedMemoryUsage(DataTypeDescriptor dtd)

nullMethodName

java.lang.String nullMethodName()

Description copied from class: BaseTypeCompiler

Return the method name to get a Derby DataValueDescriptor object of the correct type set to SQL NULL. The method named will be called with one argument: a holder object if pushCollationForDataValue() returns false, otherwise two arguments, the second being the collationType.

Specified by:

nullMethodName in class BaseTypeCompiler