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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.access 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.derby.impl.store.access.UTFQualifier

UTFQualifier
public class UTFQualifier implements Qualifier(Code)



Constructor Summary
public  UTFQualifier(int columnId, String value)
    

Method Summary
public  voidclearOrderableCache()
     Clear the DataValueDescriptor cache, if one exists.
public  intgetColumnId()
     Get the id of the column to be qualified.
public  intgetOperator()
     Get the operator to use in the comparison.
public  DataValueDescriptorgetOrderable()
     Get the value that the column is to be compared to.
public  booleangetOrderedNulls()
    
public  booleangetUnknownRV()
     Get the getOrderedNulls argument to use in the comparison.
public  booleannegateCompareResult()
     Determine if the result from the compare operation is to be negated.
public  voidreinitialize()
     This method reinitializes all the state of the Qualifier.


Constructor Detail
UTFQualifier
public UTFQualifier(int columnId, String value)(Code)




Method Detail
clearOrderableCache
public void clearOrderableCache()(Code)
Clear the DataValueDescriptor cache, if one exists. (The DataValueDescriptor can be 1 of 3 types: o VARIANT - cannot be cached as its value can vary within a scan o SCAN_INVARIANT - can be cached within a scan as its value will not change within a scan o QUERY_INVARIANT- can be cached across the life of the query as its value will never change o CONSTANT - can be cached across executions
See Also:   Qualifier.getUnknownRV



getColumnId
public int getColumnId()(Code)
Get the id of the column to be qualified. *



getOperator
public int getOperator()(Code)
Get the operator to use in the comparison.
See Also:   DataValueDescriptor.compare



getOrderable
public DataValueDescriptor getOrderable()(Code)
Get the value that the column is to be compared to.
exception:
  StandardException - Thrown on error



getOrderedNulls
public boolean getOrderedNulls()(Code)

See Also:   Qualifier.getOrderedNulls



getUnknownRV
public boolean getUnknownRV()(Code)
Get the getOrderedNulls argument to use in the comparison.
See Also:   DataValueDescriptor.compare



negateCompareResult
public boolean negateCompareResult()(Code)
Determine if the result from the compare operation is to be negated.

If true then only rows which fail the compare operation will qualify.
See Also:   DataValueDescriptor.compare




reinitialize
public void reinitialize()(Code)
This method reinitializes all the state of the Qualifier. It is used to distinguish between resetting something that is query invariant and something that is constant over every execution of a query. Basically, clearOrderableCache() will only clear out its cache if it is a VARIANT or SCAN_INVARIANT value. However, each time a query is executed, the QUERY_INVARIANT qualifiers need to be reset.



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)

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