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## com.sleepycat.bind.tuple
Class DoubleBinding

    java.lang.Object
      com.sleepycat.bind.tuple.TupleBase
          com.sleepycat.bind.tuple.TupleBinding
              com.sleepycat.bind.tuple.DoubleBinding

All Implemented Interfaces:
  EntryBinding

    public class DoubleBinding

extends TupleBinding

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.je` 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.
`Object` | `entryToObject(TupleInput input)` Constructs a key or data object from a `TupleInput` entry.
`protected TupleOutput` | `getTupleOutput(Object object)` Returns an empty TupleOutput instance that will be used by the tuple binding or key creator.
`void` | `objectToEntry(Object 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 Object entryToObject(TupleInput input)

  Description copied from class: `TupleBinding`
  Constructs a key or data object from a `TupleInput` entry.

  Specified by:
    `entryToObject` in class `TupleBinding`
  Parameters:
    `input` - is the tuple key or data entry.
  Returns:
    the key or data object constructed from the entry.

### objectToEntry

    public void objectToEntry(Object object,
                              TupleOutput output)

  Description copied from class: `TupleBinding`
  Converts a key or data object to a tuple entry.

  Specified by:
    `objectToEntry` in class `TupleBinding`
  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(Object 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`
  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.

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Copyright (c) 1996-2006 Sleepycat Software, Inc. - All rights reserved.