org.objectweb.medor.optim.lib
Class BasicRule

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

All Implemented Interfaces:

RewriteRule

Direct Known Subclasses:

DropUnusedProjFieldsRule, DropUselessNodeRule, FlattenQueryTreeRule, GroupSameDBRule, PushNotInExpressionRule, PushSelectionRule, RdbAssignRdbAdapterRule

public abstract class BasicRule

extends java.lang.Object

implements RewriteRule

Author:

S. Chassande-Barrioz

Nested Class Summary

class

BasicRule.ModifiedExpression A ModifiedExpression is a structure containing an Expression and a boolean indicating whether the Expression has been modified or not.

Field Summary

protected boolean	debug
protected Logger	log

Constructor Summary

BasicRule()

BasicRule(java.lang.String suffix)

Method Summary

protected void	replaceUsage(QueryNode qn, java.util.Map old2neo)
QueryTree	rewrite(QueryTree qt) This method applies a single rule.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.objectweb.medor.optim.api.RewriteRule

rewrite

Field Detail

log

protected Logger log

debug

protected boolean debug

Constructor Detail

BasicRule

public BasicRule()

BasicRule

public BasicRule(java.lang.String suffix)

Method Detail

rewrite

public QueryTree rewrite(QueryTree qt)
                  throws MedorException

Description copied from interface: RewriteRule

This method applies a single rule. It is typically called by the QueryRewriter for applying the entire rewriting process.

It is the same method, but the QueryTree to be rewritten is the top QueryTree (no parent).

Specified by:

rewrite in interface RewriteRule

Parameters:

qt - the QueryTree to be rewritten

Returns:

the rewritten QueryTree

Throws:

MedorException

replaceUsage

protected void replaceUsage(QueryNode qn,
                            java.util.Map old2neo)
                     throws MedorException

Throws:

MedorException