Package db

Class LongField

java.lang.Object

db.Field

db.LongField

All Implemented Interfaces:

Comparable<Field>

public final class LongField
extends Field

LongField provides a wrapper for 8-byte signed long data which is read or written to a Record.

Nested Class Summary

Nested classes/interfaces inherited from class db.Field

Field.UnsupportedFieldException

Field Summary

Fields

Modifier and Type	Field	Description
static final LongField	INSTANCE	Instance intended for defining a Table Schema
static final LongField	MAX_VALUE	Maximum long field value
static final LongField	MIN_VALUE	Minimum long field value
static final LongField	ZERO_VALUE	Zero long field value

Fields inherited from class db.Field

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor	Description
LongField()	Construct a long field with an initial value of 0.
LongField(long l)	Construct a long field with an initial value of l.

Method Summary

Modifier and Type	Method	Description
int	compareTo(Field o)	Compares this Field with another Field for order.
LongField	copyField()	Create new instance of this field with the same value.
boolean	equals(Object obj)	Determine if the specified Object is another Field which has the same type and value as this Field.
byte[]	getBinaryData()	Get data as a byte array.
long	getLongValue()	Get field as a long value.
String	getValueAsString()	Get field value as a formatted string
int	hashCode()
final boolean	isNull()	Determine if the field has been set to a null-state or value.
LongField	newField()	Create new instance of this field type.
void	setBinaryData(byte[] bytes)	Set data from binary byte array.
void	setLongValue(long value)	Set field's long value.
String	toString()

Methods inherited from class db.Field

canIndex, getBooleanValue, getByteValue, getIntValue, getShortValue, getString, isSameType, isVariableLength, setBooleanValue, setByteValue, setIntValue, setShortValue, setString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

MIN_VALUE

public static final LongField MIN_VALUE

Minimum long field value

MAX_VALUE

public static final LongField MAX_VALUE

Maximum long field value

ZERO_VALUE

public static final LongField ZERO_VALUE

Zero long field value

INSTANCE

public static final LongField INSTANCE

Instance intended for defining a Table Schema

Constructor Details

LongField

public LongField()

Construct a long field with an initial value of 0.

LongField

public LongField(long l)

Construct a long field with an initial value of l.

Parameters:

l - initial value

Method Details

getLongValue

public long getLongValue()

Description copied from class: Field

Get field as a long value. All fixed-length field objects must implement this method

Overrides:

getLongValue in class Field

Returns:

long value

setLongValue

public void setLongValue(long value)

Description copied from class: Field

Set field's long value. All fixed-length field objects must implement this method

Overrides:

setLongValue in class Field

Parameters:

value - long value

getValueAsString

public String getValueAsString()

Description copied from class: Field

Get field value as a formatted string

Specified by:

getValueAsString in class Field

Returns:

field value string

equals

public boolean equals(Object obj)

Description copied from class: Field

Determine if the specified Object is another Field which has the same type and value as this Field. When comparing a PrimitiveField, with a null state, a value of zero (0) is used.

Specified by:

equals in class Field

Parameters:

obj - another object

Returns:

true if this field equals obj

compareTo

public int compareTo(Field o)

Description copied from class: Field

Compares this Field with another Field for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified Field.
NOTE: Field objects do not fully comply with the Comparable interface. Only the same Field implementations may be compared. In addition, the null state is not considered when comparing PrimitiveFields which have a zero (0) value.

Specified by:

compareTo in interface Comparable<Field>

Specified by:

compareTo in class Field

Parameters:

o - another Field which is the same type as this Field

Returns:

field comparison result (see Comparable.compareTo(Object)).

copyField

public LongField copyField()

Description copied from class: Field

Create new instance of this field with the same value.

Specified by:

copyField in class Field

Returns:

new field instance with same value

newField

public LongField newField()

Description copied from class: Field

Create new instance of this field type.

Specified by:

newField in class Field

Returns:

new field instance with undefined initial value

getBinaryData

public byte[] getBinaryData()

Description copied from class: Field

Get data as a byte array.

Specified by:

getBinaryData in class Field

Returns:

byte[]

setBinaryData

public void setBinaryData(byte[] bytes)

Description copied from class: Field

Set data from binary byte array. All variable-length fields must implement this method.

Specified by:

setBinaryData in class Field

Parameters:

bytes - field data

hashCode

public int hashCode()

Specified by:

hashCode in class Field

isNull

public final boolean isNull()

Description copied from class: Field

Determine if the field has been set to a null-state or value.

Specified by:

isNull in class Field

Returns:

true if field has been set to a null state or value, else false

toString

public String toString()

Overrides:

toString in class Object