com.sleepycat.bind.tuple
Class DoubleBinding

java.lang.Object
  com.sleepycat.bind.tuple.TupleBase<E>
      com.sleepycat.bind.tuple.TupleBinding<Double>
          com.sleepycat.bind.tuple.DoubleBinding

All Implemented Interfaces:

EntryBinding<Double>

public class DoubleBinding
extends TupleBinding<Double>

A concrete TupleBinding for a Double primitive wrapper or a double primitive.

Note: This class produces byte array values that by default (without a custom comparator) do not sort correctly for negative values. Only non-negative values are sorted correctly by default. To sort all values correctly by default, use SortedDoubleBinding.

There are two ways to use this class:

1. When using the com.sleepycat.db package directly, the static methods in this class can be used to convert between primitive values and DatabaseEntry objects.
2. When using the com.sleepycat.collections package, an instance of this class can be used with any stored collection. The easiest way to obtain a binding instance is with the TupleBinding.getPrimitiveBinding(java.lang.Class) method.

Constructor Summary

DoubleBinding()

Method Summary

static void	doubleToEntry(double val, DatabaseEntry entry) Converts a simple double value into an entry buffer.
static double	entryToDouble(DatabaseEntry entry) Converts an entry buffer into a simple double value.
Double	entryToObject(TupleInput input) Constructs a key or data object from a TupleInput entry.
protected TupleOutput	getTupleOutput(Double object) Returns an empty TupleOutput instance that will be used by the tuple binding or key creator.
void	objectToEntry(Double object, TupleOutput output) Converts a key or data object to a tuple entry.

Methods inherited from class com.sleepycat.bind.tuple.TupleBinding

entryToObject, getPrimitiveBinding, objectToEntry

Methods inherited from class com.sleepycat.bind.tuple.TupleBase

entryToInput, getTupleBufferSize, inputToEntry, newOutput, newOutput, outputToEntry, setTupleBufferSize

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleBinding

public DoubleBinding()

Method Detail

entryToObject

public Double entryToObject(TupleInput input)

Description copied from class: TupleBinding

Constructs a key or data object from a TupleInput entry.

Specified by:

entryToObject in class TupleBinding<Double>

Parameters:

input - is the tuple key or data entry.

Returns:

the key or data object constructed from the entry.

objectToEntry

public void objectToEntry(Double object,
                          TupleOutput output)

Description copied from class: TupleBinding

Converts a key or data object to a tuple entry.

Specified by:

objectToEntry in class TupleBinding<Double>

Parameters:

object - is the key or data object.

output - is the tuple entry to which the key or data should be written.

getTupleOutput

protected TupleOutput getTupleOutput(Double object)

Description copied from class: TupleBase

Returns an empty TupleOutput instance that will be used by the tuple binding or key creator.

The default implementation of this method creates a new TupleOutput with an initial buffer size that can be changed using the TupleBase.setTupleBufferSize(int) method.

This method may be overridden to return a TupleOutput instance. For example, an instance per thread could be created and returned by this method. If a TupleOutput instance is reused, be sure to call its FastOutputStream.reset() method before each use.

Overrides:

getTupleOutput in class TupleBase<Double>

Parameters:

object - is the object to be written to the tuple output, and may be used by subclasses to determine the size of the output buffer.

Returns:

an empty TupleOutput instance.

See Also:

TupleBase.setTupleBufferSize(int)

entryToDouble

public static double entryToDouble(DatabaseEntry entry)

Converts an entry buffer into a simple double value.

Parameters:

entry - is the source entry buffer.

Returns:

the resulting value.

doubleToEntry

public static void doubleToEntry(double val,
                                 DatabaseEntry entry)

Converts a simple double value into an entry buffer.

Parameters:

val - is the source value.

entry - is the destination entry buffer.