TypeCompiler

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org.apache.derby.iapi.sql.compile
Interface TypeCompiler

public interface TypeCompiler

This interface defines methods associated with a TypeId that are used by the compiler.

Field Summary

static java.lang.String AVG_OP


static int BOOLEAN_MAXWIDTH_AS_CHAR


static int DEFAULT_DECIMAL_PRECISION


static int DEFAULT_DECIMAL_SCALE


static java.lang.String DIVIDE_OP


static int DOUBLE_MAXWIDTH_AS_CHAR


static int INT_MAXWIDTH_AS_CHAR


static int LONGINT_MAXWIDTH_AS_CHAR
          Various fixed numbers related to datatypes.

static int MAX_DECIMAL_PRECISION_SCALE


static java.lang.String MINUS_OP


static java.lang.String MOD_OP


static java.lang.String PLUS_OP


static int REAL_MAXWIDTH_AS_CHAR


static int SMALLINT_MAXWIDTH_AS_CHAR


static java.lang.String SUM_OP


static java.lang.String TIMES_OP


static int TINYINT_MAXWIDTH_AS_CHAR


Method Summary

boolean comparable(org.apache.derby.iapi.types.TypeId otherType, boolean forEquals, org.apache.derby.iapi.services.loader.ClassFactory cf)
          Determine if this type can be compared to some other type

boolean compatible(org.apache.derby.iapi.types.TypeId otherType)
          Determine if this type is compatible to some other type (e.g.

boolean convertible(org.apache.derby.iapi.types.TypeId otherType, boolean forDataTypeFunction)
          Determine if this type can be CONVERTed to some other type

void generateDataValue(org.apache.derby.iapi.services.compiler.MethodBuilder eb, org.apache.derby.iapi.services.compiler.LocalField field)
          Generate the code necessary to produce a SQL value based on a value.

void generateNull(org.apache.derby.iapi.services.compiler.MethodBuilder mb)
          Generate the code necessary to produce a SQL null of the appropriate type.

int getCastToCharWidth(org.apache.derby.iapi.types.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 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 from a DataValueDescriptor.

java.lang.String interfaceName()
          Get the name of the interface for this type.

org.apache.derby.iapi.types.DataTypeDescriptor resolveArithmeticOperation(org.apache.derby.iapi.types.DataTypeDescriptor leftType, org.apache.derby.iapi.types.DataTypeDescriptor rightType, java.lang.String operator)
          Type resolution methods on binary operators

boolean storable(org.apache.derby.iapi.types.TypeId otherType, org.apache.derby.iapi.services.loader.ClassFactory cf)
          Determine if this type can have a value of another type stored into it.

Field Detail

LONGINT_MAXWIDTH_AS_CHAR

public static final int LONGINT_MAXWIDTH_AS_CHAR

Various fixed numbers related to datatypes.

See Also:: Constant Field Values

INT_MAXWIDTH_AS_CHAR

public static final int INT_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

SMALLINT_MAXWIDTH_AS_CHAR

public static final int SMALLINT_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

TINYINT_MAXWIDTH_AS_CHAR

public static final int TINYINT_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

DOUBLE_MAXWIDTH_AS_CHAR

public static final int DOUBLE_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

REAL_MAXWIDTH_AS_CHAR

public static final int REAL_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

DEFAULT_DECIMAL_PRECISION

public static final int DEFAULT_DECIMAL_PRECISION

See Also:: Constant Field Values

DEFAULT_DECIMAL_SCALE

public static final int DEFAULT_DECIMAL_SCALE

See Also:: Constant Field Values

MAX_DECIMAL_PRECISION_SCALE

public static final int MAX_DECIMAL_PRECISION_SCALE

See Also:: Constant Field Values

BOOLEAN_MAXWIDTH_AS_CHAR

public static final int BOOLEAN_MAXWIDTH_AS_CHAR

See Also:: Constant Field Values

PLUS_OP

public static final java.lang.String PLUS_OP

See Also:: Constant Field Values

DIVIDE_OP

public static final java.lang.String DIVIDE_OP

See Also:: Constant Field Values

MINUS_OP

public static final java.lang.String MINUS_OP

See Also:: Constant Field Values

TIMES_OP

public static final java.lang.String TIMES_OP

See Also:: Constant Field Values

SUM_OP

public static final java.lang.String SUM_OP

See Also:: Constant Field Values

AVG_OP

public static final java.lang.String AVG_OP

See Also:: Constant Field Values

MOD_OP

public static final java.lang.String MOD_OP

See Also:: Constant Field Values

Method Detail

resolveArithmeticOperation

public org.apache.derby.iapi.types.DataTypeDescriptor resolveArithmeticOperation(org.apache.derby.iapi.types.DataTypeDescriptor leftType,
                                                                                 org.apache.derby.iapi.types.DataTypeDescriptor rightType,
                                                                                 java.lang.String operator)
                                                                          throws org.apache.derby.iapi.error.StandardException

Type resolution methods on binary operators

comparable

public boolean comparable(org.apache.derby.iapi.types.TypeId otherType,
                          boolean forEquals,
                          org.apache.derby.iapi.services.loader.ClassFactory cf)

Determine if this type can be compared to some other type

convertible

public boolean convertible(org.apache.derby.iapi.types.TypeId otherType,
                           boolean forDataTypeFunction)

Determine if this type can be CONVERTed to some other type

compatible

public boolean compatible(org.apache.derby.iapi.types.TypeId otherType)

Determine if this type is compatible to some other type (e.g. COALESCE(thistype, othertype)).

storable

public boolean storable(org.apache.derby.iapi.types.TypeId otherType,
                        org.apache.derby.iapi.services.loader.ClassFactory cf)

Determine if this type can have a value of another type stored into it. Note that direction is relevant here: the test is that the otherType is storable into this type.

interfaceName

public java.lang.String interfaceName()

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.

getCorrespondingPrimitiveTypeName

public java.lang.String getCorrespondingPrimitiveTypeName()

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.

getPrimitiveMethodName

public java.lang.String getPrimitiveMethodName()

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

getMatchingNationalCharTypeName

public java.lang.String getMatchingNationalCharTypeName()

Get the name of the matching national char type.

generateNull

public void generateNull(org.apache.derby.iapi.services.compiler.MethodBuilder mb)

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()).

generateDataValue

public void generateDataValue(org.apache.derby.iapi.services.compiler.MethodBuilder eb,
                              org.apache.derby.iapi.services.compiler.LocalField field)

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

getCastToCharWidth

public int getCastToCharWidth(org.apache.derby.iapi.types.DataTypeDescriptor dts)

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