org.imemex.logicalplan.rewrite
Class AbstractRewriteRule

java.lang.Object
  org.imemex.logicalplan.treewalkers.AbstractTreeWalker
      org.imemex.logicalplan.rewrite.AbstractRewriteRule

All Implemented Interfaces:

RewriteRule, LogicalTreeWalker

Direct Known Subclasses:

ElimIntersectAllRule, FilterInliningRule, KeywordQueryRelaxationRule, NameRelaxationRule, NAryToBinaryUnion, PredicateMergeRule, RemoveStupidNodesRule, RuleAllToTable, RuleDbSelect, RuleEmpty, RuleFilteredTableRows, RuleFilterOnTop, RuleGreyToBlack, RuleIntersect, RuleIntersectTable, RuleJoin, RulePropagateEmptyIntersect, RulePropagateEmptyUnnest, RuleRemoveEmptyUnion, RuleTableRows, RuleUnion

public abstract class AbstractRewriteRule
extends AbstractTreeWalker
implements RewriteRule

Version:

1.0

Author:

ogirard

Nested Class Summary

Nested classes/interfaces inherited from interface org.imemex.logicalplan.rewrite.RewriteRule

RewriteRule.Helper

Field Summary

static RewriteRuleMetadata

DEFAULT_REWRITERULE_METADATA

Constructor Summary

AbstractRewriteRule(java.lang.String patternString)

AbstractRewriteRule(java.lang.String[] patternStrings)

Method Summary

RewriteRuleMetadata	getMetaData() gets metadata of this rule
LogicalNode	rewrite(LogicalNode lognode) rewrites the logical query

Methods inherited from class org.imemex.logicalplan.treewalkers.AbstractTreeWalker

applyRules, defaultMatch, doAfterEnd, doBeforeStart, getMatches, getPatterns, hasMatch, processTree, processTree, wasChanged

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_REWRITERULE_METADATA

public static final RewriteRuleMetadata DEFAULT_REWRITERULE_METADATA

Constructor Detail

AbstractRewriteRule

public AbstractRewriteRule(java.lang.String patternString)

Parameters:

patternString - pattern to be parsed and matched

See Also:

LogicalPattern

AbstractRewriteRule

public AbstractRewriteRule(java.lang.String[] patternStrings)

Parameters:

patternStrings - patterns to be parsed and matched (or)

See Also:

LogicalPattern

Method Detail

getMetaData

public RewriteRuleMetadata getMetaData()

Description copied from interface: RewriteRule

gets metadata of this rule

Specified by:

getMetaData in interface RewriteRule

Returns:

rewrite

public LogicalNode rewrite(LogicalNode lognode)

Description copied from interface: RewriteRule

rewrites the logical query

Specified by:

rewrite in interface RewriteRule

Parameters:

lognode - root of logical tree

Returns:

root of rewritten tree