org.teiid.internal.core.index
Class MergeFactory

java.lang.Object
  org.teiid.internal.core.index.MergeFactory

public class MergeFactory
extends java.lang.Object

A mergeFactory is used to merge 2 indexes into one. One of the indexes (oldIndex) is on the disk and the other(addsIndex) is in memory. The merge respects the following rules:
- The files are sorted in alphabetical order;
- if a file is in oldIndex and addsIndex, the one which is added is the one in the addsIndex.

Field Summary

static int	ADDS_INDEX
protected IndexInput	addsInput Input on the addsIndex.
protected int[]	mappingAdds
protected int[]	mappingOld
protected BlocksIndexOutput	mergeOutput Output to write the result of the merge in.
static int	OLD_INDEX
protected IndexInput	oldInput Input on the oldIndex.
protected java.util.Map	removedInAdds Files removed from addsIndex.
protected java.util.Map	removedInOld Files removed from oldIndex.

Constructor Summary

MergeFactory(IndexInput oldIndexInput, IndexInput addsIndexInput, BlocksIndexOutput mergeIndexOutput, java.util.Map removedInOld, java.util.Map removedInAdds)
MergeFactory constructor comment.

Method Summary

protected void	init() Initialise the merge.
void	merge() Merges the 2 indexes into a new one on the disk.
protected void	mergeFiles() Merges the files of the 2 indexes in the new index, removes the files to be removed, and records the changes made to propagate them to the word references.
protected void	mergeReferences() Merges the files of the 2 indexes in the new index, according to the changes recorded during mergeFiles().
protected void	removeFile(IndexedFile file, int index) Records the deletion of one file.
protected boolean	wasRemoved(IndexedFile indexedFile, int index) Returns whether the given file has to be removed from the given index (ADDS_INDEX or OLD_INDEX).

Methods inherited from class java.lang.Object

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

Field Detail

addsInput

protected IndexInput addsInput

Input on the addsIndex.

oldInput

protected IndexInput oldInput

Input on the oldIndex.

mergeOutput

protected BlocksIndexOutput mergeOutput

Output to write the result of the merge in.

removedInOld

protected java.util.Map removedInOld

Files removed from oldIndex.

removedInAdds

protected java.util.Map removedInAdds

Files removed from addsIndex.

mappingOld

protected int[] mappingOld

mappingAdds

protected int[] mappingAdds

ADDS_INDEX

public static final int ADDS_INDEX

See Also:

Constant Field Values

OLD_INDEX

public static final int OLD_INDEX

See Also:

Constant Field Values

Constructor Detail

MergeFactory

public MergeFactory(IndexInput oldIndexInput,
                    IndexInput addsIndexInput,
                    BlocksIndexOutput mergeIndexOutput,
                    java.util.Map removedInOld,
                    java.util.Map removedInAdds)

MergeFactory constructor comment.

Parameters:

directory - java.io.File

Method Detail

init

protected void init()

Initialise the merge.

merge

public void merge()
           throws java.io.IOException

Merges the 2 indexes into a new one on the disk.

Throws:

java.io.IOException

mergeFiles

protected void mergeFiles()
                   throws java.io.IOException

Merges the files of the 2 indexes in the new index, removes the files to be removed, and records the changes made to propagate them to the word references.

Throws:

java.io.IOException

mergeReferences

protected void mergeReferences()
                        throws java.io.IOException

Merges the files of the 2 indexes in the new index, according to the changes recorded during mergeFiles().

Throws:

java.io.IOException

removeFile

protected void removeFile(IndexedFile file,
                          int index)

Records the deletion of one file.

wasRemoved

protected boolean wasRemoved(IndexedFile indexedFile,
                             int index)

Returns whether the given file has to be removed from the given index (ADDS_INDEX or OLD_INDEX). If it has to be removed, the mergeFactory deletes it and records the changes.