Java Doc for FetchDescriptor.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » store » raw » 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.iapi.store.raw 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.derby.iapi.store.raw.FetchDescriptor

FetchDescriptor
final public class FetchDescriptor (Code)
FetchDescriptor is used to package up all the arguments necessary to describe what rows and what row parts should be returned from the store back to language as part of a fetch.

The FetchDescriptor may also contain scratch space used to process the qualifiers passed in the scan. This scratch space will be used to cache information about the qualifiers, valid column list, row size so that calculations need only be done once per scan rather than every iteration.




Constructor Summary
 FetchDescriptor()
    
public  FetchDescriptor(int input_row_length)
    
public  FetchDescriptor(int input_row_length, int single_valid_column_number)
    
public  FetchDescriptor(int input_row_length, FormatableBitSet input_validColumns, Qualifier[][] input_qualifier_list)
    

Method Summary
final public  int[]getMaterializedColumns()
     Internal to store.
final public  intgetMaxFetchColumnId()
     Internal to store.
final public  Qualifier[][]getQualifierList()
     Return the qualifier array.

Return the array of qualifiers in this FetchDescriptor.

final public  FormatableBitSetgetValidColumns()
     Return the column list bit map.

A description of which columns to return from every fetch in the scan.

final public  int[]getValidColumnsArray()
    
final public  voidreset()
     Internal to store.
final public  voidsetValidColumns(FormatableBitSet input_validColumns)
    


Constructor Detail
FetchDescriptor
FetchDescriptor()(Code)
Constructors for This class:



FetchDescriptor
public FetchDescriptor(int input_row_length)(Code)



FetchDescriptor
public FetchDescriptor(int input_row_length, int single_valid_column_number)(Code)



FetchDescriptor
public FetchDescriptor(int input_row_length, FormatableBitSet input_validColumns, Qualifier[][] input_qualifier_list)(Code)




Method Detail
getMaterializedColumns
final public int[] getMaterializedColumns()(Code)
Internal to store.



getMaxFetchColumnId
final public int getMaxFetchColumnId()(Code)
Internal to store.



getQualifierList
final public Qualifier[][] getQualifierList()(Code)
Return the qualifier array.

Return the array of qualifiers in this FetchDescriptor. The array of qualifiers which, applied to each key, restricts the rows returned by the scan. Rows for which any one of the qualifiers returns false are not returned by the scan. If null, all rows are returned. Qualifiers can only reference columns which are included in the scanColumnList. The column id that a qualifier returns in the column id the table, not the column id in the partial row being returned.

A null qualifier array means there are no qualifiers. The qualifier array, it may be null.
exception:
  StandardException - Standard exception policy.




getValidColumns
final public FormatableBitSet getValidColumns()(Code)
Return the column list bit map.

A description of which columns to return from every fetch in the scan. A row array and a valid column bit map work together to describe the row to be returned by the scan - see RowUtil for description of how these two parameters work together to describe a "row". The column list bit map.
exception:
  StandardException - Standard exception policy.




getValidColumnsArray
final public int[] getValidColumnsArray()(Code)



reset
final public void reset()(Code)
Internal to store.



setValidColumns
final public void setValidColumns(FormatableBitSet input_validColumns)(Code)



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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