com.pervasive.datarush.tokens.scalar

Class DoubleToken

java.lang.Object

com.pervasive.datarush.tokens.scalar.DoubleToken

All Implemented Interfaces:

DataToken, DoubleValued, NumericValued, ScalarToken, ScalarValued, TokenValued, ScalarTyped, TokenTyped, Serializable, Comparable<DoubleToken>

public final class DoubleToken
extends Object
implements ScalarToken, Comparable<DoubleToken>

An immutable DoubleValued object.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DoubleToken	NULL A null valued DoubleToken
static DoubleToken	ZERO A zero valued DoubleToken
static double	ZERO_VALUE The double zero value, 0.0d.

Fields inherited from interface com.pervasive.datarush.tokens.scalar.NumericValued

MAX_INFINITY, MIN_INFINITY

Constructor Summary

Constructors

Constructor and Description
DoubleToken(double value) Constructs a new token with the given non-null double value.
DoubleToken(DoubleValued value) Constructs a new token with the double value in the given container.

Method Summary

Modifier and Type	Method and Description
BigDecimal	asBigDecimal() Gets the contained numeric value.
double	asDouble() Gets the contained double value.
Double	asObject() Gets the value of the token as an object.
int	compareTo(DoubleToken that)
boolean	equals(Object obj) Indicates whether another object is equal to this token.
ScalarTokenType	getType() Gets the data type of the token.
int	hashCode() Returns a hash code for the token.
boolean	isNull() Indicates whether the token is null valued.
boolean	isZero() Indicates whether the value is the zero value for the type.
static DoubleToken	parse(String value) Converts a string representation of a double value into a token.
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.pervasive.datarush.tokens.DataToken

toString

Methods inherited from interface com.pervasive.datarush.tokens.scalar.ScalarValued

getType, isZero

Methods inherited from interface com.pervasive.datarush.tokens.TokenValued

isNull

Field Detail

NULL

public static final DoubleToken NULL

A null valued DoubleToken

ZERO_VALUE

public static final double ZERO_VALUE

The double zero value, 0.0d.

See Also:

Constant Field Values

ZERO

public static final DoubleToken ZERO

A zero valued DoubleToken

Constructor Detail

DoubleToken

public DoubleToken(DoubleValued value)

Constructs a new token with the double value in the given container.

Parameters:

value - a DoubleValued containing the desired value

DoubleToken

public DoubleToken(double value)

Constructs a new token with the given non-null double value. If a null valued token is desired, use NULL.

Parameters:

value - the double value of the token

Method Detail

asObject

public Double asObject()

Gets the value of the token as an object.

Returns:

an object representing the token value, null if the token is null valued.

compareTo

public int compareTo(DoubleToken that)

Specified by:

compareTo in interface Comparable<DoubleToken>

equals

public boolean equals(Object obj)

Description copied from interface: DataToken

Indicates whether another object is equal to this token. Two null valued tokens are considered equal. This differs from the behavior of TokenComparator.equal(TokenValued,TokenValued) but makes it possible to store DataTokens in Maps.

Specified by:

equals in interface DataToken

Overrides:

equals in class Object

Parameters:

obj - the object to compare

Returns:

true if the other object is a token of the same type and contains the same value, false otherwise.

hashCode

public int hashCode()

Description copied from interface: DataToken

Returns a hash code for the token. This value is guaranteed to be consistent with that returned by TokenConverter.asHashCode(TokenValued).

Specified by:

hashCode in interface DataToken

Overrides:

hashCode in class Object

Returns:

a hash code value for the token

parse

public static DoubleToken parse(String value)

Converts a string representation of a double value into a token.

Parameters:

value - a string value to interpret as a double; see Double.valueOf(String)

Returns:

a token with the specified value

getType

public final ScalarTokenType getType()

Description copied from interface: TokenValued

Gets the data type of the token. This type will dictate the valid values that can be contained.

Specified by:

getType in interface ScalarValued

Specified by:

getType in interface TokenValued

Specified by:

getType in interface ScalarTyped

Specified by:

getType in interface TokenTyped

Returns:

the token type.

asBigDecimal

public final BigDecimal asBigDecimal()

Description copied from interface: NumericValued

Gets the contained numeric value.

Specified by:

asBigDecimal in interface NumericValued

Returns:

the contained value as a java.math.BigDecimal. If null valued, as indicated by TokenValued.isNull(), null is returned.

asDouble

public final double asDouble()

Description copied from interface: DoubleValued

Gets the contained double value.

Specified by:

asDouble in interface DoubleValued

Returns:

the contained value as a double. If null valued, as indicated by TokenValued.isNull(), Double.NaN is returned.

isZero

public final boolean isZero()

Description copied from interface: ScalarValued

Indicates whether the value is the zero value for the type. Zero values are not stored in sparse representation formats.

Specified by:

isZero in interface ScalarValued

Returns:

true if the value is the zero value, false otherwise.

toString

public String toString()

Overrides:

toString in class Object

isNull

public final boolean isNull()

Description copied from interface: TokenValued

Indicates whether the token is null valued. Tokens support null values analogous to SQL. Before accessing the value of the container, it is usually best to ensure it is not null valued using this method.

Specified by:

isNull in interface TokenValued

Returns:

true if the token is null valued, false otherwise