question: private boolean isLeafPage ( ByteBuffer buffer ) throws IOException { byte pageType = buffer . get ( 0 ) ; if ( pageType == PageTypes . INDEX_LEAF ) { return true ; } else if ( pageType == PageTypes . INDEX_NODE ) { return false ; } throw new IOException ( withErrorContext ( "Unexpected page type " + pageType ) ) ; }
target:  Determines if the given index page is a leaf or node page.