org.apache.jackrabbit.core.query.lucene
Class CachingMultiReader

java.lang.Object
  org.apache.lucene.index.IndexReader
      org.apache.lucene.index.MultiReader
          org.apache.jackrabbit.core.query.lucene.CachingMultiReader

All Implemented Interfaces:

HierarchyResolver

public final class CachingMultiReader

extends org.apache.lucene.index.MultiReader

implements HierarchyResolver

Extends a MultiReader with support for cached TermDocs on FieldNames.UUID field.

Constructor Summary

CachingMultiReader(org.apache.jackrabbit.core.query.lucene.ReadOnlyIndexReader[] subReaders, org.apache.jackrabbit.core.query.lucene.DocNumberCache cache)
Creates a new CachingMultiReader based on sub readers.

Method Summary

protected void	doClose() Decrements the reference count and closes the underlying readers if this reader is not in use anymore.
int	getParent(int n) Returns the document number of the parent of n or -1 if n does not have a parent (n is the root node).
org.apache.jackrabbit.core.query.lucene.DocId	getParentDocId(int n) Returns the DocId of the parent of n or DocId#NULL if n does not have a parent (n is the root node).
org.apache.lucene.index.TermDocs	termDocs(org.apache.lucene.index.Term term)

Methods inherited from class org.apache.lucene.index.MultiReader

docFreq, doCommit, document, doDelete, doSetNorm, doUndeleteAll, getFieldNames, getFieldNames, getIndexedFieldNames, getTermFreqVector, getTermFreqVectors, hasDeletions, isDeleted, maxDoc, norms, norms, numDocs, termDocs, termPositions, terms, terms

Methods inherited from class org.apache.lucene.index.IndexReader

close, commit, delete, delete, directory, finalize, getCurrentVersion, getCurrentVersion, getCurrentVersion, indexExists, indexExists, indexExists, isLocked, isLocked, lastModified, lastModified, lastModified, open, open, open, setNorm, setNorm, termPositions, undeleteAll, unlock

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingMultiReader

public CachingMultiReader(org.apache.jackrabbit.core.query.lucene.ReadOnlyIndexReader[] subReaders,
                          org.apache.jackrabbit.core.query.lucene.DocNumberCache cache)
                   throws IOException

Creates a new CachingMultiReader based on sub readers.

Parameters:

subReaders - the sub readers.

cache - the document number cache.

Throws:

IOException - if an error occurs while reading from the indexes.

Method Detail

getParent

public final int getParent(int n)
                    throws IOException

Returns the document number of the parent of n or -1 if n does not have a parent (n is the root node).

Specified by:

getParent in interface HierarchyResolver

Parameters:

n - the document number.

Returns:

the document number of n's parent.

Throws:

IOException - if an error occurs while reading from the index.

getParentDocId

public final org.apache.jackrabbit.core.query.lucene.DocId getParentDocId(int n)
                                                                   throws IOException

Returns the DocId of the parent of n or DocId#NULL if n does not have a parent (n is the root node).

Parameters:

n - the document number.

Returns:

the DocId of n's parent.

Throws:

IOException - if an error occurs while reading from the index.

termDocs

public org.apache.lucene.index.TermDocs termDocs(org.apache.lucene.index.Term term)
                                          throws IOException

Throws:

IOException

doClose

protected void doClose()
                throws IOException

Decrements the reference count and closes the underlying readers if this reader is not in use anymore.

Throws:

IOException - if an error occurs while closing this reader.