com.sleepycat.bind.tuple
Class TupleBinding

java.lang.Object
  |
  +--com.sleepycat.bind.tuple.TupleBinding

All Implemented Interfaces:

EntryBinding

Direct Known Subclasses:

BooleanBinding, ByteBinding, CharacterBinding, DoubleBinding, FloatBinding, IntegerBinding, LongBinding, ShortBinding, StringBinding, TupleMarshalledBinding

public abstract class TupleBinding

extends Object

implements EntryBinding

An abstract EntryBinding that treats a key or data entry as a tuple; it includes predefined bindings for Java primitive types.

This class takes care of converting the entries to/from TupleInput and TupleOutput objects. Its two abstract methods must be implemented by a concrete subclass to convert between tuples and key or data objects.

• entryToObject(TupleInput)
• objectToEntry(Object,TupleOutput)

For key or data entries which are Java primitive classes (String, Integer, etc) getPrimitiveBinding(java.lang.Class) may be used to return a builtin tuple binding. A custom tuple binding for these types is not needed.

Author:

Mark Hayes

Constructor Summary

TupleBinding()
Creates a tuple binding.

Method Summary

static TupleInput	entryToInput(DatabaseEntry entry) Utility method to create a new tuple input object for reading the data from a given buffer.
Object	entryToObject(DatabaseEntry entry) Converts a entry buffer into an Object.
abstract Object	entryToObject(TupleInput input) Constructs a key or data object from a TupleInput entry.
static TupleBinding	getPrimitiveBinding(Class cls) Creates a tuple binding for a primitive Java class.
static void	inputToEntry(TupleInput input, DatabaseEntry entry) Utility method to set the data in a entry buffer to the data in a tuple input object.
static TupleOutput	newOutput() Utility method for use by bindings to create a tuple output object.
static TupleOutput	newOutput(byte[] buffer) Utility method for use by bindings to create a tuple output object with a specific starting size.
void	objectToEntry(Object object, DatabaseEntry entry) Converts an Object into a entry buffer.
abstract void	objectToEntry(Object object, TupleOutput output) Converts a key or data object to a tuple entry.
static void	outputToEntry(TupleOutput output, DatabaseEntry entry) Utility method to set the data in a entry buffer to the data in a tuple output object.

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleBinding

public TupleBinding()

Creates a tuple binding.

Method Detail

entryToObject

public Object entryToObject(DatabaseEntry entry)

Description copied from interface: EntryBinding

Converts a entry buffer into an Object.

Specified by:

entryToObject in interface EntryBinding

Parameters:

entry - is the source entry buffer.

Returns:

the resulting Object.

objectToEntry

public void objectToEntry(Object object,
                          DatabaseEntry entry)

Description copied from interface: EntryBinding

Converts an Object into a entry buffer.

Specified by:

objectToEntry in interface EntryBinding

Parameters:

object - is the source Object.

entry - is the destination entry buffer.

newOutput

public static TupleOutput newOutput()

Utility method for use by bindings to create a tuple output object.

Returns:

a new tuple output object.

newOutput

public static TupleOutput newOutput(byte[] buffer)

Utility method for use by bindings to create a tuple output object with a specific starting size.

Returns:

a new tuple output object.

outputToEntry

public static void outputToEntry(TupleOutput output,
                                 DatabaseEntry entry)

Utility method to set the data in a entry buffer to the data in a tuple output object.

Parameters:

output - is the source tuple output object.

entry - is the destination entry buffer.

inputToEntry

public static void inputToEntry(TupleInput input,
                                DatabaseEntry entry)

Utility method to set the data in a entry buffer to the data in a tuple input object.

Parameters:

input - is the source tuple input object.

entry - is the destination entry buffer.

entryToInput

public static TupleInput entryToInput(DatabaseEntry entry)

Utility method to create a new tuple input object for reading the data from a given buffer. If an existing input is reused, it is reset before returning it.

Parameters:

entry - is the source entry buffer.

Returns:

the new tuple input object.

entryToObject

public abstract Object entryToObject(TupleInput input)

Constructs a key or data object from a TupleInput entry.

Parameters:

input - is the tuple key or data entry.

Returns:

the key or data object constructed from the entry.

objectToEntry

public abstract void objectToEntry(Object object,
                                   TupleOutput output)

Converts a key or data object to a tuple entry.

Parameters:

object - is the key or data object.

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

getPrimitiveBinding

public static TupleBinding getPrimitiveBinding(Class cls)

Creates a tuple binding for a primitive Java class. The following Java classes are supported.

• String
• Character
• Boolean
• Byte
• Short
• Integer
• Long
• Float
• Double

Parameters:

cls - is the primitive Java class.

Returns:

a new binding for the primitive class or null if the cls parameter is not one of the supported classes.