void freePages()

in mavibot/src/main/java/org/apache/directory/mavibot/btree/RecordManager.java [3725:3807]
64 lines of code
15 McCabe index (conditional complexity)

    /* Package protected */<K, V> void freePages( BTree<K, V> btree, long revision, List<Page<K, V>> pages )
        throws EndOfFileExceededException, IOException
    {
        if ( ( pages == null ) || pages.isEmpty() )
        {
            return;
        }

        if ( !keepRevisions )
        {
            // if the B-tree doesn't keep revisions, we can safely move
            // the pages to the freed page list.
            if ( LOG.isDebugEnabled() )
            {
                LOG.debug( "Freeing the following pages :" );

                for ( Page<K, V> page : pages )
                {
                    LOG.debug( "    {}", page );
                }
            }

            for ( Page<K, V> page : pages )
            {
                long pageOffset = ( ( AbstractPage<K, V> ) page ).getOffset();

                PageIO[] pageIos = readPageIOs( pageOffset, Long.MAX_VALUE );

                for ( PageIO pageIo : pageIos )
                {
                    freedPages.add( pageIo );
                }
            }
        }
        else
        {
            // We are keeping revisions of standard B-trees, so we move the pages to the CopiedPages B-tree
            // but only for non managed B-trees
            if ( LOG.isDebugEnabled() )
            {
                LOG.debug( "Moving the following pages to the CopiedBtree :" );

                for ( Page<K, V> page : pages )
                {
                    LOG.debug( "    {}", page );
                }
            }

            long[] pageOffsets = new long[pages.size()];
            int pos = 0;

            for ( Page<K, V> page : pages )
            {
                pageOffsets[pos++] = ( ( AbstractPage<K, V> ) page ).offset;
            }

            if ( ( btree.getType() != BTreeTypeEnum.BTREE_OF_BTREES )
                && ( btree.getType() != BTreeTypeEnum.COPIED_PAGES_BTREE ) )
            {
                // Deal with standard B-trees
                RevisionName revisionName = new RevisionName( revision, btree.getName() );

                copiedPageBtree.insert( revisionName, pageOffsets );

                // Update the RecordManager Copiedpage Offset
                currentCopiedPagesBtreeOffset = ( ( PersistedBTree<RevisionName, long[]> ) copiedPageBtree )
                    .getBtreeOffset();
            }
            else
            {
                // Managed B-trees : we simply free the copied pages
                for ( long pageOffset : pageOffsets )
                {
                    PageIO[] pageIos = readPageIOs( pageOffset, Long.MAX_VALUE );

                    for ( PageIO pageIo : pageIos )
                    {
                        freedPages.add( pageIo );
                    }
                }
            }
        }
    }