Java Doc for MergeScan.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » access » sort » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.access.sort   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.derby.impl.store.access.sort.Scan       org.apache.derby.impl.store.access.sort.SortScan          org.apache.derby.impl.store.access.sort.MergeScan All known Subclasses:   org.apache.derby.impl.store.access.sort.MergeScanRowSource, MergeScan public class MergeScan extends SortScan (Code) A sort scan that is capable of merging as many merge runs as will fit in the passed-in sort buffer. Field Summary protected  Vector mergeRuns      The merge runs. protected  StreamContainerHandle openScans      Array of scan controllers for the merge runs. protected  SortBuffer sortBuffer      The sort buffer we will use. Constructor Summary   MergeScan(MergeSort sort, TransactionManager tran, SortBuffer sortBuffer, Vector mergeRuns, SortObserver sortObserver, boolean hold)      Method Summary public  void close()      Close the scan. public  boolean closeForEndTransaction(boolean closeHeldScan)      Close the scan. public  boolean init(TransactionManager tran)      Initialize the scan, returning false if there was some error.  void mergeARow(int scanindex)      Insert rows while we keep getting duplicates from the merge run whose scan is in the open scan array entry indexed by scanindex. public  boolean next()      Move to the next position in the scan. Field Detail mergeRuns protected Vector mergeRuns(Code) The merge runs. openScans protected StreamContainerHandle openScans(Code) Array of scan controllers for the merge runs. Entries in the array become null as the last row is pulled out and the scan is closed. sortBuffer protected SortBuffer sortBuffer(Code) The sort buffer we will use. Constructor Detail MergeScan MergeScan(MergeSort sort, TransactionManager tran, SortBuffer sortBuffer, Vector mergeRuns, SortObserver sortObserver, boolean hold)(Code) Method Detail close public void close()(Code) Close the scan. See Also:   ScanController.close closeForEndTransaction public boolean closeForEndTransaction(boolean closeHeldScan)(Code) Close the scan. See Also:   ScanManager.closeForEndTransaction init public boolean init(TransactionManager tran) throws StandardException(Code) Initialize the scan, returning false if there was some error. mergeARow void mergeARow(int scanindex) throws StandardException(Code) Insert rows while we keep getting duplicates from the merge run whose scan is in the open scan array entry indexed by scanindex. next public boolean next() throws StandardException(Code) Move to the next position in the scan. See Also:   ScanController.next Fields inherited from org.apache.derby.impl.store.access.sort.SortScan protected DataValueDescriptor[] current(Code)(Java Doc) protected boolean hold(Code)(Java Doc) protected MergeSort sort(Code)(Java Doc) protected TransactionManager tran(Code)(Java Doc) Methods inherited from org.apache.derby.impl.store.access.sort.SortScan public void close()(Code)(Java Doc) final public void fetch(DataValueDescriptor[] result) throws StandardException(Code)(Java Doc) final public boolean fetchNext(DataValueDescriptor[] row) throws StandardException(Code)(Java Doc) final public void fetchWithoutQualify(DataValueDescriptor[] result) throws StandardException(Code)(Java Doc) Methods inherited from org.apache.derby.impl.store.access.sort.Scan public boolean delete() throws StandardException(Code)(Java Doc) public void didNotQualify() throws StandardException(Code)(Java Doc) public boolean doesCurrentPositionQualify() throws StandardException(Code)(Java Doc) public void fetchLocation(RowLocation templateLocation) throws StandardException(Code)(Java Doc) public int fetchNextGroup(DataValueDescriptor[][] row_array, RowLocation[] rowloc_array) throws StandardException(Code)(Java Doc) public int fetchNextGroup(DataValueDescriptor[][] row_array, RowLocation[] old_rowloc_array, RowLocation[] new_rowloc_array) throws StandardException(Code)(Java Doc) public void fetchSet(long max_rowcnt, int[] key_column_numbers, BackingStoreHashtable hash_table) throws StandardException(Code)(Java Doc) public Properties getAllScanInfo(Properties prop) throws StandardException(Code)(Java Doc) public long getEstimatedRowCount() throws StandardException(Code)(Java Doc) public ScanInfo getScanInfo() throws StandardException(Code)(Java Doc) public boolean isCurrentPositionDeleted() throws StandardException(Code)(Java Doc) public boolean isKeyed()(Code)(Java Doc) public boolean isTableLocked()(Code)(Java Doc) public RowLocation newRowLocationTemplate() throws StandardException(Code)(Java Doc) public boolean positionAtRowLocation(RowLocation rl) throws StandardException(Code)(Java Doc) public void reopenScan(DataValueDescriptor[] startKeyValue, int startSearchOperator, Qualifier qualifier, DataValueDescriptor[] stopKeyValue, int stopSearchOperator) throws StandardException(Code)(Java Doc) public void reopenScanByRowLocation(RowLocation startRowLocation, Qualifier qualifier) throws StandardException(Code)(Java Doc) public boolean replace(DataValueDescriptor[] val, FormatableBitSet validColumns) throws StandardException(Code)(Java Doc) public void savePosition(Conglomerate conglom, Page page) throws StandardException(Code)(Java Doc) public void setEstimatedRowCount(long count) throws StandardException(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)