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java.lang.Objectantlr.TreeParser
net.esper.eql.generated.EQLBaseWalker
net.esper.eql.parse.EQLPatternTreeWalker
public class EQLPatternTreeWalker
Called during the walks of a pattern expression AST tree as specified in the grammar file.
Constructs a pattern evaluation tree under a EvalRootNode
.
Keeps track of event types generated by pattern.
Field Summary |
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Fields inherited from class net.esper.eql.generated.EQLBaseWalker |
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_tokenNames, _tokenSet_0, _tokenSet_1, _tokenSet_2 |
Fields inherited from class antlr.TreeParser |
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_retTree, astFactory, ASTNULL, inputState, returnAST, tokenNames, traceDepth |
Constructor Summary | |
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EQLPatternTreeWalker(EventAdapterService eventAdapterService)
Ctor. |
Method Summary | |
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protected void |
end()
Ends the tree walk and checks if all expression nodes have a home root node. |
EvalRootNode |
getRootNode()
Returns root node of pattern eval tree. |
Map<String,EventType> |
getTaggedEventTypes()
Returns event trypes, if any, as specified as part of filters used in pattern. |
protected void |
leaveNode(antlr.collections.AST node)
Leave AST node and process it's type and child nodes. |
Methods inherited from class antlr.TreeParser |
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getAST, getASTFactory, getTokenName, getTokenNames, match, match, matchNot, panic, reportError, reportError, reportWarning, setASTFactory, setASTNodeClass, setASTNodeType, traceIn, traceIndent, traceOut |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EQLPatternTreeWalker(EventAdapterService eventAdapterService)
eventAdapterService
- for resolving event namesMethod Detail |
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public EvalRootNode getRootNode()
public Map<String,EventType> getTaggedEventTypes()
protected void end() throws ASTWalkException
end
in class EQLBaseWalker
ASTWalkException
protected void leaveNode(antlr.collections.AST node) throws ASTWalkException
leaveNode
in class EQLBaseWalker
node
- to leave
ASTWalkException
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