org.apache.jackrabbit.core.query.lucene
Interface HierarchyResolver

All Known Implementing Classes:

CachingMultiIndexReader, JackrabbitIndexReader, SearchIndex.CombinedIndexReader

public interface HierarchyResolver

HierarchyResolver extends an IndexReader with the ability to resolve a JCR hierarchy.

Method Summary

int[]

getParents(int n, int[] docNumbers) Returns the document number of the parent of n or an empty array if n does not have a parent (n is the root node).

Method Detail

getParents

int[] getParents(int n,
                 int[] docNumbers)
                 throws IOException

Returns the document number of the parent of n or an empty array if n does not have a parent (n is the root node).

Parameters:

n - the document number.

docNumbers - an array for reuse. An implementation should use the passed array as a container for the return value, unless the length of the returned array is different from docNumbers. In which case an implementation will create a new array with an appropriate size.

Returns:

the document number of n's parent.

Throws:

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