uk.ac.ic.doc.automed.wrappers
Class AutoMedType

java.lang.Object
  uk.ac.ic.doc.automed.wrappers.AutoMedType

Direct Known Subclasses:

AutoMedBoolean, AutoMedFloat, AutoMedInteger, AutoMedString, AutoMedTime, AutoMedTuple

public abstract class AutoMedType
extends java.lang.Object

Provides a base for the representation of basic types supported by AutoMed.

Author:

Peter McBrien (pjm@doc.ic.ac.uk)

Field Summary

static int	BOOLEAN Type to represent a boolean true/false value.
static int	FLOAT Type to represent a floating point atomic type
static int	INTEGER Type to represent a twos-complement integer atomic type
static java.lang.String	NULL_STR String to use to represent null values
static int	STRING Type to represent an arbitrary length string in the unicode character set.
static int	TIME Type to represent a time (on a particular day)
static int	TUPLE Type to represent a tuple of atomic types

Constructor Summary

AutoMedType()

Method Summary

abstract double	doubleValue() Return the double representation of this AutoMedType.
abstract boolean	equals(AutoMedType v) Test two AutoMedTypes for equality, performing conversions as appropriate.
abstract int	getType() Return the Type (INTEGER, TUPLE, ...) of this AutoMedType
boolean	isLiteral() Check if this is a literal type
boolean	isNull() Is this type a null value?
boolean	isNumeric() Check if this is a numeric type
abstract java.lang.String	toString() Return a string representation of this AutoMedType.

Methods inherited from class java.lang.Object

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

Field Detail

NULL_STR

public static final java.lang.String NULL_STR

String to use to represent null values

See Also:

Constant Field Values

INTEGER

public static final int INTEGER

Type to represent a twos-complement integer atomic type

See Also:

Constant Field Values

TUPLE

public static final int TUPLE

Type to represent a tuple of atomic types

See Also:

Constant Field Values

FLOAT

public static final int FLOAT

Type to represent a floating point atomic type

See Also:

Constant Field Values

TIME

public static final int TIME

Type to represent a time (on a particular day)

See Also:

Constant Field Values

STRING

public static final int STRING

Type to represent an arbitrary length string in the unicode character set.

See Also:

Constant Field Values

BOOLEAN

public static final int BOOLEAN

Type to represent a boolean true/false value.

See Also:

Constant Field Values

Constructor Detail

AutoMedType

public AutoMedType()

Method Detail

toString

public abstract java.lang.String toString()

Return a string representation of this AutoMedType.

Overrides:

toString in class java.lang.Object

doubleValue

public abstract double doubleValue()

Return the double representation of this AutoMedType. Booleans will be converted to 1.0 if true, 0 otherwise. Strings are parsed as doubles, and if that parsing fails then 0 is returned. Tuples return the arity of the tuple.

getType

public abstract int getType()

Return the Type (INTEGER, TUPLE, ...) of this AutoMedType

equals

public abstract boolean equals(AutoMedType v)

Test two AutoMedTypes for equality, performing conversions as appropriate. Note that, unlike SQL but like Java, two null types will return true when compared.

isNull

public boolean isNull()

Is this type a null value?

isNumeric

public boolean isNumeric()

Check if this is a numeric type

isLiteral

public boolean isLiteral()

Check if this is a literal type