Java Doc for CardinalityCounter.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » sql » execute » 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.sql.execute   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.derby.impl.sql.execute.CardinalityCounter CardinalityCounter public class CardinalityCounter implements RowLocationRetRowSource(Code) This is a decorator (in Design Patterns Terminology) class to enhance the functionality of a RowLocationRetRowSource. It assumes that the rows are coming in sorted order from the row source and it simply keeps track of the cardinality of all the leading columns. Constructor Summary public   CardinalityCounter(RowLocationRetRowSource rowSource)      Method Summary public  void closeRowSource()      public  long[] getCardinality()      return the array of cardinalities that are kept internally. public  DataValueDescriptor[] getNextRowFromRowSource()      Gets next row from the row source and update the count of unique values that are returned. public  long getRowCount()      get the number of rows seen in the row source thus far. public  FormatableBitSet getValidColumns()      public  void keepCount(DataValueDescriptor[] currentKey)      public  boolean needsRowLocation()      public  boolean needsToClone()      public  void rowLocation(RowLocation rl)      Constructor Detail CardinalityCounter public CardinalityCounter(RowLocationRetRowSource rowSource)(Code) Method Detail closeRowSource public void closeRowSource()(Code) See Also:   RowLocationRetRowSource.closeRowSource See Also:    getCardinality public long[] getCardinality()(Code) return the array of cardinalities that are kept internally. One value for each leading key; i.e c1, (c1,c2), (c1,c2,c3) etc. an array of unique values. getNextRowFromRowSource public DataValueDescriptor[] getNextRowFromRowSource() throws StandardException(Code) Gets next row from the row source and update the count of unique values that are returned. See Also:   RowLocationRetRowSource.getNextRowFromRowSource See Also:    getRowCount public long getRowCount()(Code) get the number of rows seen in the row source thus far. total rows seen from the row source. getValidColumns public FormatableBitSet getValidColumns()(Code) See Also:   RowLocationRetRowSource.getValidColumns See Also:    keepCount public void keepCount(DataValueDescriptor[] currentKey) throws StandardException(Code) needsRowLocation public boolean needsRowLocation()(Code) See Also:   RowLocationRetRowSource.needsRowLocation See Also:    needsToClone public boolean needsToClone()(Code) See Also:   RowLocationRetRowSource.needsToClone See Also:    rowLocation public void rowLocation(RowLocation rl) throws StandardException(Code) See Also:   RowLocationRetRowSource.rowLocation See Also:    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)