Package com.sleepycat.db

Class MultipleDataEntry

java.lang.Object

com.sleepycat.db.DatabaseEntry

com.sleepycat.db.MultipleEntry

com.sleepycat.db.MultipleDataEntry

public class MultipleDataEntry
extends MultipleEntry

A DatabaseEntry that holds multiple data items returned by a single Database or Cursor get call.

Constructor Summary

Constructors

Constructor	Description
MultipleDataEntry()	Construct an entry with no data.
MultipleDataEntry(byte[] data)	Construct an entry with a given byte array.
MultipleDataEntry(byte[] data, int offset, int size)	Constructs a DatabaseEntry with a given byte array, offset and size.

Method Summary

Modifier and Type	Method	Description
boolean	append(byte[] data)	Append an entry to the bulk buffer.
boolean	append(byte[] data, int offset, int len)	Append an entry to the bulk buffer.
boolean	append(DatabaseEntry data)	Append an entry to the bulk buffer.
boolean	next(DatabaseEntry data)	Get the next data element in the returned set.

Methods inherited from class com.sleepycat.db.MultipleEntry

append_internal, append_internal, setUserBuffer

Methods inherited from class com.sleepycat.db.DatabaseEntry

equals, getBlob, getData, getDataNIO, getExternalFile, getOffset, getPartial, getPartialLength, getPartialOffset, getReadOnly, getRecordNumber, getReuseBuffer, getSize, getUserBuffer, getUserBufferLength, hashCode, setBlob, setData, setData, setDataNIO, setDataNIO, setExternalFile, setOffset, setPartial, setPartial, setPartialLength, setPartialOffset, setReadOnly, setRecordNumber, setReuseBuffer, setSize

Methods inherited from class java.lang.Object

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

Constructor Detail

MultipleDataEntry

public MultipleDataEntry()

Construct an entry with no data. The object must be configured before use with the MultipleEntry.setUserBuffer method.

MultipleDataEntry

public MultipleDataEntry(byte[] data)

Construct an entry with a given byte array. The offset is set to zero; the size is set to the length of the array. If null is passed, the object must be configured before use with the MultipleEntry.setUserBuffer method.

Parameters:

data - Byte array wrapped by the entry.

MultipleDataEntry

public MultipleDataEntry(byte[] data,
                         int offset,
                         int size)

Constructs a DatabaseEntry with a given byte array, offset and size.

Parameters:

data - Byte array wrapped by the DatabaseEntry.

offset - Offset in the first byte in the byte array to be included.

size - Number of bytes in the byte array to be included.

Method Detail

next

public boolean next(DatabaseEntry data)

Get the next data element in the returned set. This method may only be called after a successful call to a Database or Cursor get method with this object as the data parameter.

When used with the Queue and Recno access methods, data.getData() will return null for deleted records.

Parameters:

data - an entry that is set to refer to the next data element in the returned set.

Returns:

indicates whether a value was found. A return of false indicates that the end of the set was reached.

append

public boolean append(byte[] data,
                      int offset,
                      int len)
               throws DatabaseException

Append an entry to the bulk buffer.

Parameters:

data - an array containing the record to be added.

offset - the position in the data array where the record starts.

len - the length of the record, in bytes, to be copied from the data array.

Returns:

indicates whether there was space. A return of false indicates that the specified entry could not fit in the buffer.

Throws:

DatabaseException - if a failure occurs.

append

public boolean append(DatabaseEntry data)
               throws DatabaseException

Append an entry to the bulk buffer.

Parameters:

data - the record to be appended, using the offset and size specified in the DatabaseEntry.

Returns:

indicates whether there was space. A return of false indicates that the specified entry could not fit in the buffer.

Throws:

DatabaseException - if a failure occurs.

append

public boolean append(byte[] data)
               throws DatabaseException

Append an entry to the bulk buffer.

Parameters:

data - an array containing the record to be added.

Returns:

indicates whether there was space. A return of false indicates that the specified entry could not fit in the buffer.

Throws:

DatabaseException - if a failure occurs.