org.axiondb.util
Class StringBTree

java.lang.Object
  org.axiondb.util.BaseBTree
      org.axiondb.util.ObjectBTree
          org.axiondb.util.StringBTree

public class StringBTree

extends ObjectBTree

An ObjectBTreeoptimized for reading and writing Strings.

Version:

$Revision: 1.6 $ $Date: 2004/08/27 03:21:22 $

Constructor Summary

StringBTree(File idxDir, String idxName, int minimizationFactor, Comparator comp)
Create or load a new root node.

Method Summary

protected ObjectBTree	createNode(org.axiondb.util.BTreeMetaData meta, Comparator comp) Create a new node.
protected Object	getReplacementForNullKey()
protected ObjectBTree	loadNode(org.axiondb.util.BTreeMetaData meta, Comparator comp, int fileId) Read the node with the specified fileId from disk.
protected void	read() Reads in the node.
protected void	write() Writes the node file out.

Methods inherited from class org.axiondb.util.ObjectBTree

addFileId, addFileId, addFileIds, addKeyValuePair, clearData, delete, get, getAll, getAllExcludingNull, getAllExcludingNull, getAllFrom, getAllTo, getBTreeMetaData, getChildIds, getFileId, getFileIdForIndex, getKey, getKeyCapacity, getMinimizationFactor, getValue, getValues, inorderIterator, insert, isFull, isLeaf, isRoot, replaceId, save, save, saveAfterTruncate, saveCounterIfRoot, setChildIds, setFileId, setValue, setValues, size, space, toString, truncate

Methods inherited from class java.lang.Object

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

Constructor Detail

StringBTree

public StringBTree(File idxDir,
                   String idxName,
                   int minimizationFactor,
                   Comparator comp)
            throws IOException,
                   ClassNotFoundException

Create or load a new root node.

Method Detail

createNode

protected ObjectBTree createNode(org.axiondb.util.BTreeMetaData meta,
                                 Comparator comp)
                          throws IOException,
                                 ClassNotFoundException

Description copied from class: ObjectBTree

Create a new node.

Overrides:

createNode in class ObjectBTree

Throws:

IOException

ClassNotFoundException

loadNode

protected ObjectBTree loadNode(org.axiondb.util.BTreeMetaData meta,
                               Comparator comp,
                               int fileId)
                        throws IOException,
                               ClassNotFoundException

Description copied from class: ObjectBTree

Read the node with the specified fileId from disk.

Overrides:

loadNode in class ObjectBTree

Throws:

IOException

ClassNotFoundException

read

protected void read()
             throws IOException,
                    ClassNotFoundException

Description copied from class: ObjectBTree

Reads in the node. This doesn't read in the entire subtree, which happens incrementally as files are needed.

Overrides:

read in class ObjectBTree

Throws:

IOException

ClassNotFoundException

write

protected void write()
              throws IOException

Description copied from class: ObjectBTree

Writes the node file out. This is differentiated from save in that it doesn't save the entire tree or the counter file.

Overrides:

write in class ObjectBTree

Throws:

IOException

getReplacementForNullKey

protected Object getReplacementForNullKey()

Overrides:

getReplacementForNullKey in class ObjectBTree