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

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

All Implemented Interfaces:

TypeCompiler

Direct Known Subclasses:

BitTypeCompiler, BooleanTypeCompiler, CharTypeCompiler, CLOBTypeCompiler, DateTypeCompiler, LOBTypeCompiler, NumericTypeCompiler, RefTypeCompiler, TimestampTypeCompiler, TimeTypeCompiler, UserDefinedTypeCompiler, XMLTypeCompiler

abstract class BaseTypeCompiler

extends java.lang.Object

implements TypeCompiler

This is the base implementation of TypeCompiler

Author:

Jeff

Field Summary

private TypeId

correspondingTypeId

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

(package private)

BaseTypeCompiler()

Method Summary

protected java.lang.String	dataValueMethodName() Return the method name to get a Derby DataValueDescriptor object of the correct type.
void	generateDataValue(MethodBuilder mb, LocalField field) Generate the code necessary to produce a SQL value based on a value.
void	generateNull(MethodBuilder mb) Generate the code necessary to produce a SQL null of the appropriate type.
java.lang.String	getMatchingNationalCharTypeName() Get the name of the matching national char type.
java.lang.String	getPrimitiveMethodName() Get the method name for getting out the corresponding primitive Java type.
protected int	getStoredFormatIdFromTypeId() Get the StoredFormatId from the corresponding TypeId.
protected TypeCompiler	getTypeCompiler(TypeId typeId) Get the TypeCompiler that corresponds to the given TypeId.
protected TypeId	getTypeId() Get the TypeId that corresponds to this TypeCompiler.
protected abstract java.lang.String	nullMethodName()
boolean	numberComparable(TypeId otherType, boolean forEquals, ClassFactory cf) Tell whether this numeric type can be compared to the given type.
boolean	numberConvertible(TypeId otherType, boolean forDataTypeFunction) Tell whether this numeric type can be converted to the given type.
boolean	numberStorable(TypeId thisType, TypeId otherType, ClassFactory cf) Tell whether this numeric type can be stored into from the given type.
DataTypeDescriptor	resolveArithmeticOperation(DataTypeDescriptor leftType, DataTypeDescriptor rightType, java.lang.String operator) Type resolution methods on binary operators
(package private) void	setTypeId(TypeId typeId) Set the TypeCompiler that corresponds to the given TypeId.
protected boolean	userTypeStorable(TypeId thisType, TypeId otherType, ClassFactory cf) Determine whether thisType is storable in otherType due to otherType being a user type.

Methods inherited from class java.lang.Object

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

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

comparable, compatible, convertible, getCastToCharWidth, getCorrespondingPrimitiveTypeName, interfaceName, storable

Field Detail

correspondingTypeId

private TypeId correspondingTypeId

Constructor Detail

BaseTypeCompiler

BaseTypeCompiler()

Method Detail

getPrimitiveMethodName

public java.lang.String getPrimitiveMethodName()

Get the method name for getting out the corresponding primitive Java type.

Specified by:

getPrimitiveMethodName in interface TypeCompiler

Returns:

String The method call name for getting the corresponding primitive Java type.

getMatchingNationalCharTypeName

public java.lang.String getMatchingNationalCharTypeName()

Description copied from interface: TypeCompiler

Get the name of the matching national char type.

Specified by:

getMatchingNationalCharTypeName in interface TypeCompiler

Returns:

The name of the matching national char type.

See Also:

TypeCompiler.getMatchingNationalCharTypeName()

resolveArithmeticOperation

public DataTypeDescriptor resolveArithmeticOperation(DataTypeDescriptor leftType,
                                                     DataTypeDescriptor rightType,
                                                     java.lang.String operator)
                                              throws StandardException

Description copied from interface: TypeCompiler

Type resolution methods on binary operators

Specified by:

resolveArithmeticOperation in interface TypeCompiler

Parameters:

leftType - The type of the left parameter

rightType - The type of the right parameter

operator - The name of the operator (e.g. "+").

Returns:

The type of the result

Throws:

StandardException - Thrown on error

See Also:

TypeCompiler.resolveArithmeticOperation(org.apache.derby.iapi.types.DataTypeDescriptor, org.apache.derby.iapi.types.DataTypeDescriptor, java.lang.String)

generateNull

public void generateNull(MethodBuilder mb)

Description copied from interface: TypeCompiler

Generate the code necessary to produce a SQL null of the appropriate type. The stack must contain a DataValueFactory and a null or a value of the correct type (interfaceName()).

Specified by:

generateNull in interface TypeCompiler

Parameters:

mb - The method to put the expression in

See Also:

TypeCompiler.generateNull(org.apache.derby.iapi.services.compiler.MethodBuilder)

generateDataValue

public void generateDataValue(MethodBuilder mb,
                              LocalField field)

Description copied from interface: TypeCompiler

Generate the code necessary to produce a SQL value based on a value. The value's type is assumed to match the type of this TypeId. For example, a TypeId for the SQL int type should be given an value that evaluates to a Java int or Integer. If the type of the value is incorrect, the generated code will not work. The stack must contain data value factory value

Specified by:

generateDataValue in interface TypeCompiler

See Also:

TypeCompiler.generateDataValue(org.apache.derby.iapi.services.compiler.MethodBuilder, org.apache.derby.iapi.services.compiler.LocalField)

nullMethodName

protected abstract java.lang.String nullMethodName()

dataValueMethodName

protected java.lang.String dataValueMethodName()

Return the method name to get a Derby DataValueDescriptor object of the correct type. This implementation returns "getDataValue".

userTypeStorable

protected boolean userTypeStorable(TypeId thisType,
                                   TypeId otherType,
                                   ClassFactory cf)

Determine whether thisType is storable in otherType due to otherType being a user type.

Parameters:

thisType - The TypeId of the value to be stored

otherType - The TypeId of the value to be stored in

Returns:

true if thisType is storable in otherType

numberComparable

public boolean numberComparable(TypeId otherType,
                                boolean forEquals,
                                ClassFactory cf)

Tell whether this numeric type can be compared to the given type.

Parameters:

otherType - The TypeId of the other type.

numberConvertible

public boolean numberConvertible(TypeId otherType,
                                 boolean forDataTypeFunction)

Tell whether this numeric type can be converted to the given type.

Parameters:

otherType - The TypeId of the other type.

forDataTypeFunction - was this called from a scalarFunction like CHAR() or DOUBLE()

numberStorable

public boolean numberStorable(TypeId thisType,
                              TypeId otherType,
                              ClassFactory cf)

Tell whether this numeric type can be stored into from the given type.

Parameters:

thisType - The TypeId of this type

otherType - The TypeId of the other type.

cf - A ClassFactory

getTypeId

protected TypeId getTypeId()

Get the TypeId that corresponds to this TypeCompiler.

getTypeCompiler

protected TypeCompiler getTypeCompiler(TypeId typeId)

Get the TypeCompiler that corresponds to the given TypeId.

setTypeId

void setTypeId(TypeId typeId)

Set the TypeCompiler that corresponds to the given TypeId.

getStoredFormatIdFromTypeId

protected int getStoredFormatIdFromTypeId()

Get the StoredFormatId from the corresponding TypeId.

Returns:

The StoredFormatId from the corresponding TypeId.