jnr.ffi
Class Address

java.lang.Object
  java.lang.Number
      jnr.ffi.Address

All Implemented Interfaces:

Serializable, Comparable<Address>

public final class Address
extends Number
implements Comparable<Address>

The Address class wraps a native address in an object. Both 32 bit and 64 bit native address values are wrapped in a singular Address type.

This class extends Number and implements all Number methods for converting to primitive integer types.

An Address instance is lighter weight than most Pointer instances, and may be used when a native address needs to be stored in java, but no other operations (such as reading/writing values) need be performed on the native memory. For most cases, a Pointer offers more flexibility and should be preferred instead.

See Also:

Serialized Form

Constructor Summary

Address(Address address)
Creates a new address representation.

Method Summary

long	address() Gets the native memory address represented by this Address as a long integer.
int	compareTo(Address other) Compares two Address instances numerically.
double	doubleValue() Returns the value of this Address as a double.
boolean	equals(Object obj) Compares this address to another address.
float	floatValue() Returns the value of this Address as a float.
int	hashCode() Returns a hash code for this Address.
int	intValue() Returns the value of this Address as an int.
boolean	isNull() Tests if this Address is equivalent to C NULL
long	longValue() Returns the value of this Address as a long.
long	nativeAddress() Returns the native value of this address.
String	toHexString() Returns a String object representing this Address as a hex value.
String	toString() Returns a String object representing this Address as a decimal value.
static Address	valueOf(int address) Returns a Address instance representing the specified int value.
static Address	valueOf(long address) Returns a Address instance representing the specified long value.

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Constructor Detail

Address

public Address(Address address)

Creates a new address representation.

Parameters:

address - the native address.

Method Detail

address

public final long address()

Gets the native memory address represented by this Address as a long integer.

Returns:

the native memory address

intValue

public final int intValue()

Returns the value of this Address as an int. On 64bit systems, this will result in the upper 32bits of the address being truncated.

Specified by:

intValue in class Number

Returns:

the numeric value of this Address after conversion to an int.

longValue

public final long longValue()

Returns the value of this Address as a long.

Specified by:

longValue in class Number

Returns:

the numeric value of this Address after conversion to a long.

floatValue

public final float floatValue()

Returns the value of this Address as a float. This method is not particularly useful, and is here to fulfill the Number interface contract.

Specified by:

floatValue in class Number

Returns:

the numeric value of this Address after conversion to a float.

doubleValue

public final double doubleValue()

Returns the value of this Address as a double. This method is not particularly useful, and is here to fulfill the Number interface contract.

Specified by:

doubleValue in class Number

Returns:

the numeric value of this Address after conversion to a double.

nativeAddress

public final long nativeAddress()

Returns the native value of this address.

Returns:

an long value representing the native value of this address.

hashCode

public final int hashCode()

Returns a hash code for this Address.

Overrides:

hashCode in class Object

Returns:

a hash code for this Address.

equals

public final boolean equals(Object obj)

Compares this address to another address.

Overrides:

equals in class Object

Parameters:

obj - the other address to compare to.

Returns:

true if this Address is equal to the other address, else false.

toString

public final String toString()

Returns a String object representing this Address as a decimal value.

Overrides:

toString in class Object

Returns:

a string representation of this Address.

toHexString

public final String toHexString()

Returns a String object representing this Address as a hex value.

Returns:

a string representation of this Address.

compareTo

public final int compareTo(Address other)

Compares two Address instances numerically.

Specified by:

compareTo in interface Comparable<Address>

Parameters:

other - the other Address to compare to.

Returns:

0 if other is equal to this instance, -1 if this instance is numerically less than other or 1 if this instance is numerically greater than other.

isNull

public final boolean isNull()

Tests if this Address is equivalent to C NULL

Returns:

true if the address is 0

valueOf

public static Address valueOf(long address)

Returns a Address instance representing the specified long value.

Parameters:

address - a long value

Returns:

an Address instance representing address

valueOf

public static Address valueOf(int address)

Returns a Address instance representing the specified int value.

Parameters:

address - an int value

Returns:

an Address instance representing address