Class DropUselessNodeRule

public class DropUselessNodeRule

extends BasicRule

This rule removes the query node which are useless.

A node is useless when it does not have any filter and all fields are propagated fields which have only one ancestor.

Nested Class Summary
`class`	`DropUselessNodeRule.UsedFields`

Nested classes/interfaces inherited from class org.objectweb.medor.optim.lib.BasicRule
`BasicRule.ModifiedExpression`

Fields inherited from class org.objectweb.medor.optim.lib.BasicRule
`debug`, `log`

Constructor Summary
`DropUselessNodeRule()`

Method Summary
`protected DropUselessNodeRule.UsedFields`	`isUseless(QueryTree qt)`
`protected Field`	`replaceField(QueryTreeField qtf, Map map)`
`protected boolean`	`replaceInFilter(Expression e, Map map)`
`QueryTree`	`rewrite(QueryTree qt, QueryNode _parent)`

Methods inherited from class org.objectweb.medor.optim.lib.BasicRule
`replaceUsage`, `rewrite`

public DropUselessNodeRule()

protected DropUselessNodeRule.UsedFields isUseless(QueryTree qt)
            throws MedorException

protected Field replaceField(QueryTreeField qtf,
                             Map map)
            throws MedorException

protected boolean replaceInFilter(Expression e,
                                  Map map)
            throws MedorException

public QueryTree rewrite(QueryTree qt,
                         QueryNode _parent)
            throws MedorException

Specified by:
rewrite in interface RewriteRule

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Nested Class Summary