net.sf.farrago.type.runtime
Class NullablePrimitive

java.lang.Object
  net.sf.farrago.type.runtime.NullablePrimitive

All Implemented Interfaces:

AssignableValue, DataValue, NullableValue

Direct Known Subclasses:

NullablePrimitive.NullableBoolean, NullablePrimitive.NullableByte, NullablePrimitive.NullableDouble, NullablePrimitive.NullableFloat, NullablePrimitive.NullableInteger, NullablePrimitive.NullableLong, NullablePrimitive.NullableShort

public abstract class NullablePrimitive
extends Object
implements NullableValue, AssignableValue

NullablePrimitive is the abstract superclass for implementations of NullableValue corresponding to Java primitives. These holder classes are declared as static inner classes of NullablePrimitive with names taken from the standard holder classes in java.lang.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/type/runtime/NullablePrimitive.java#32 $

Author:

John V. Sichi

Nested Class Summary

static class	NullablePrimitive.NullableBoolean Nullable wrapper for boolean.
static class	NullablePrimitive.NullableByte Nullable wrapper for byte.
static class	NullablePrimitive.NullableDouble Nullable wrapper for double.
static class	NullablePrimitive.NullableFloat Nullable wrapper for float.
static class	NullablePrimitive.NullableInteger Nullable wrapper for int.
static class	NullablePrimitive.NullableLong Nullable wrapper for long.
static class	NullablePrimitive.NullableShort Nullable wrapper for short.

Field Summary

static String	FALSE_LITERAL
private static Integer	INT_ONE
private static Integer	INT_ZERO
boolean	isNull Whether this value is null.
static String	NULL_IND_FIELD_NAME Name of field storing null indicator.
static String	TRUE_LITERAL
static String	UNKNOWN_LITERAL
static String	VALUE_FIELD_NAME Name of field storing value.

Fields inherited from interface net.sf.farrago.type.runtime.NullableValue

NULL_IND_ACCESSOR_NAME, NULL_IND_MUTATOR_NAME

Fields inherited from interface net.sf.farrago.type.runtime.AssignableValue

ASSIGNMENT_METHOD_NAME

Constructor Summary

NullablePrimitive()

Method Summary

void	assignFrom(Object obj) Assigns value from an Object.
Object	getNullableData()
boolean	isNull()
protected abstract void	setLong(long n) Assignment from non-null long value.
void	setNull(boolean isNull) Sets whether or not the value is null.
protected abstract void	setNumber(Number number) Assignment from abstract Number object.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

VALUE_FIELD_NAME

public static final String VALUE_FIELD_NAME

Name of field storing value.

See Also:

Constant Field Values

TRUE_LITERAL

public static final String TRUE_LITERAL

See Also:

Constant Field Values

FALSE_LITERAL

public static final String FALSE_LITERAL

See Also:

Constant Field Values

UNKNOWN_LITERAL

public static final String UNKNOWN_LITERAL

See Also:

Constant Field Values

NULL_IND_FIELD_NAME

public static final String NULL_IND_FIELD_NAME

Name of field storing null indicator.

See Also:

Constant Field Values

INT_ONE

private static final Integer INT_ONE

INT_ZERO

private static final Integer INT_ZERO

isNull

public boolean isNull

Whether this value is null.

Constructor Detail

NullablePrimitive

public NullablePrimitive()

Method Detail

setNull

public void setNull(boolean isNull)

Description copied from interface: NullableValue

Sets whether or not the value is null. Note that once a value has been set to null, its data should not be updated until the null state has been cleared with a call to setNull(false).

Specified by:

setNull in interface NullableValue

Parameters:

isNull - true to set a null value; false to indicate a non-null value

isNull

public boolean isNull()

Specified by:

isNull in interface NullableValue

Returns:

whether the value has been set to null

getNullableData

public Object getNullableData()

Specified by:

getNullableData in interface DataValue

Returns:

an Object representation of this value's data, or null if this value is null

assignFrom

public void assignFrom(Object obj)

Description copied from interface: AssignableValue

Assigns value from an Object.

Specified by:

assignFrom in interface AssignableValue

Parameters:

obj - value to assign, or null to set null

setNumber

protected abstract void setNumber(Number number)

Assignment from abstract Number object.

Parameters:

number - a new non-null value to be assigned

setLong

protected abstract void setLong(long n)

Assignment from non-null long value.

Parameters:

n - long value to assign

toString

public String toString()

Overrides:

toString in class Object