com.foundationdb.sql.compiler

Class NumericTypeCompiler

java.lang.Object

com.foundationdb.sql.compiler.TypeCompiler

com.foundationdb.sql.compiler.NumericTypeCompiler

public final class NumericTypeCompiler
extends TypeCompiler

This class implements TypeId for the SQL numeric datatype.

Field Summary

Fields inherited from class com.foundationdb.sql.compiler.TypeCompiler

AVG_OP, BOOLEAN_MAXWIDTH_AS_CHAR, DIV_OP, DIVIDE_OP, DOUBLE_MAXWIDTH_AS_CHAR, INT_MAXWIDTH_AS_CHAR, LONGINT_MAXWIDTH_AS_CHAR, MINUS_OP, MOD_OP, PLUS_OP, REAL_MAXWIDTH_AS_CHAR, SMALLINT_MAXWIDTH_AS_CHAR, SUM_OP, TIMES_OP, TINYINT_MAXWIDTH_AS_CHAR

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NumericTypeCompiler(TypeId typeId)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	compatible(TypeId otherType) Tell whether this type (numeric) is compatible with the given type.
boolean	convertible(TypeId otherType, boolean forDataTypeFunction) Determine if this type can be CONVERTed to some other type
int	getCastToCharWidth(DataTypeDescriptor dts) Return the maximum width for this data type when cast to a char type.
String	getCorrespondingPrimitiveTypeName() Get the name of the corresponding Java type.
String	getPrimitiveMethodName() Get the method name for getting out the corresponding primitive Java type.
DataTypeDescriptor	resolveArithmeticOperation(DataTypeDescriptor leftType, DataTypeDescriptor rightType, String operator) Type resolution methods on binary operators

Methods inherited from class com.foundationdb.sql.compiler.TypeCompiler

getStoredFormatIdFromTypeId, getTypeCompiler, getTypeId, numberConvertible

Methods inherited from class java.lang.Object

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

Constructor Detail

NumericTypeCompiler

protected NumericTypeCompiler(TypeId typeId)

Method Detail

getCorrespondingPrimitiveTypeName

public String getCorrespondingPrimitiveTypeName()

Description copied from class: 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.

Specified by:

getCorrespondingPrimitiveTypeName in class TypeCompiler

Returns:

The name of the corresponding Java primitive type.

See Also:

TypeCompiler.getCorrespondingPrimitiveTypeName()

getPrimitiveMethodName

public String getPrimitiveMethodName()

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

Specified by:

getPrimitiveMethodName in class TypeCompiler

Returns:

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

getCastToCharWidth

public int getCastToCharWidth(DataTypeDescriptor dts)

Description copied from class: TypeCompiler

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

Specified by:

getCastToCharWidth in class TypeCompiler

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(com.foundationdb.sql.types.DataTypeDescriptor)

resolveArithmeticOperation

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

Description copied from class: TypeCompiler

Type resolution methods on binary operators

Overrides:

resolveArithmeticOperation in class 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(com.foundationdb.sql.types.DataTypeDescriptor, com.foundationdb.sql.types.DataTypeDescriptor, java.lang.String)

convertible

public boolean convertible(TypeId otherType,
                  boolean forDataTypeFunction)

Description copied from class: TypeCompiler

Determine if this type can be CONVERTed to some other type

Specified by:

convertible in class TypeCompiler

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(com.foundationdb.sql.types.TypeId, boolean)

compatible

public boolean compatible(TypeId otherType)

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

Specified by:

compatible in class TypeCompiler

Parameters:

otherType - The TypeId of the other type.

Returns:

true if the types are compatible, false if not compatible