org.objectweb.medor.optim.lib
Class IndexesGenerator

java.lang.Object
  org.objectweb.medor.optim.lib.IndexesGenerator

All Implemented Interfaces:

ExecPlanGenerator, QueryTransformer

public class IndexesGenerator

extends java.lang.Object

implements ExecPlanGenerator

Constructor Summary

IndexesGenerator()

Method Summary

int[]	computesFieldIndexes(TupleStructure ts, QueryTree[] nodes)
void	setFilterIndexes(Expression e, QueryTree[] qts) This method inherited from QueryIndexGenerator.
QueryTree	transform(QueryTree query) This methods transforms a QueryTree into another QueryTree.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IndexesGenerator

public IndexesGenerator()

Method Detail

transform

public QueryTree transform(QueryTree query)
                    throws MedorException

Description copied from interface: QueryTransformer

This methods transforms a QueryTree into another QueryTree.

Specified by:

transform in interface QueryTransformer

Throws:

MedorException

computesFieldIndexes

public int[] computesFieldIndexes(TupleStructure ts,
                                  QueryTree[] nodes)
                           throws MedorException,
                                  ExpressionException

Throws:

MedorException

ExpressionException

setFilterIndexes

public void setFilterIndexes(Expression e,
                             QueryTree[] qts)
                      throws MedorException,
                             ExpressionException

This method inherited from QueryIndexGenerator. It checks that all Fields in the Expression are present in the array of QueryTree and sets yhe indexs of the fieldOperand.

Parameters:

e - Expression filter

qts - array of QueryTree

Throws:

MedorException

ExpressionException