Package org.h2.index

Class IndexCursor

  • All Implemented Interfaces:
    Cursor
    public class IndexCursor
extends java.lang.Object
implements Cursor
    The filter used to walk through an index. This class supports IN(..) and IN(SELECT ...) optimizations.

    • Constructor Detail

      • IndexCursor

        public IndexCursor()

    • Method Detail

      • setIndex

        public void setIndex​(Index index,
                     boolean reverse)

      • prepare

        public void prepare​(SessionLocal s,
                    java.util.ArrayList<IndexCondition> indexConditions)
        Prepare this index cursor to make a lookup in index.
        Parameters:
        s - Session.
        indexConditions - Index conditions.

      • find

        public void find​(SessionLocal s,
                 java.util.ArrayList<IndexCondition> indexConditions)
        Re-evaluate the start and end values of the index search for rows.
        Parameters:
        s - the session
        indexConditions - the index conditions

      • canUseIndexForIn

        public static boolean canUseIndexForIn​(Index index,
                                       Column[] columns)
        Return true if Index.getIndexColumns() and the columns parameter contains the same elements in the same order. All column of the index must match the column in the columns array, or it must be a VIEW index (where the column is null).
        See Also:
        IndexCondition.getMask(ArrayList)

      • isAlwaysFalse

        public boolean isAlwaysFalse()
        Check if the result is empty for sure.
        Returns:
        true if it is

      • getStart

        public SearchRow getStart()
        Get start search row.
        Returns:
        search row

      • getEnd

        public SearchRow getEnd()
        Get end search row.
        Returns:
        search row

      • get

        public Row get()
        Description copied from interface: Cursor
        Get the complete current row. All column are available.
        Specified by:
        get in interface Cursor
        Returns:
        the complete row

      • getSearchRow

        public SearchRow getSearchRow()
        Description copied from interface: Cursor
        Get the current row. Only the data for indexed columns is available in this row.
        Specified by:
        getSearchRow in interface Cursor
        Returns:
        the search row

      • next

        public boolean next()
        Description copied from interface: Cursor
        Skip to the next row if one is available.
        Specified by:
        next in interface Cursor
        Returns:
        true if another row is available

      • previous

        public boolean previous()
        Description copied from interface: Cursor
        Skip to the previous row if one is available. No filtering is made here.
        Specified by:
        previous in interface Cursor
        Returns:
        true if another row is available