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java.lang.Objectnet.esper.eql.join.plan.QueryGraph
public class QueryGraph
Model of relationships between streams based on properties in both streams that are specified as equal in a filter expression.
Nested Class Summary | |
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class |
QueryGraph.GraphKey
Key consisting of 2 integer stream numbers. |
class |
QueryGraph.GraphValue
Property lists stored as a value for each stream-to-stream relationship. |
Constructor Summary | |
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QueryGraph(int numStreams)
Ctor. |
Method Summary | |
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boolean |
add(int streamLeft,
java.lang.String propertyLeft,
int streamRight,
java.lang.String propertyRight)
Add properties for 2 streams that are equal. |
protected static void |
fillEquivalentNav(QueryGraph queryGraph)
Fill in equivalent key properties (navigation entries) on all streams. |
java.lang.String[] |
getIndexProperties(int streamLookup,
int streamIndexed)
Returns index properties. |
java.lang.String[] |
getKeyProperties(int streamLookup,
int streamIndexed)
Returns key properties. |
java.util.Set<java.lang.Integer> |
getNavigableStreams(int streamFrom)
Returns set of streams that the given stream is navigable to. |
int |
getNumStreams()
Returns the number of streams. |
boolean |
isNavigable(int streamFrom,
int streamTo)
Returns true if there is a relationship between streams via equal properties. |
java.lang.String |
toString()
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public QueryGraph(int numStreams)
numStreams
- - number of streamsMethod Detail |
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public int getNumStreams()
public boolean add(int streamLeft, java.lang.String propertyLeft, int streamRight, java.lang.String propertyRight)
streamLeft
- - left hand streampropertyLeft
- - left hand stream propertystreamRight
- - right hand streampropertyRight
- - right hand stream property
public boolean isNavigable(int streamFrom, int streamTo)
streamFrom
- - from stream numberstreamTo
- - to stream number
public java.util.Set<java.lang.Integer> getNavigableStreams(int streamFrom)
streamFrom
- - from stream number
public java.lang.String[] getIndexProperties(int streamLookup, int streamIndexed)
streamLookup
- - stream to serve as source for looking up eventsstreamIndexed
- - stream to look up in
public java.lang.String[] getKeyProperties(int streamLookup, int streamIndexed)
streamLookup
- - stream to serve as source for looking up eventsstreamIndexed
- - stream to look up in
protected static void fillEquivalentNav(QueryGraph queryGraph)
queryGraph
- - navigablity info between streamsspublic java.lang.String toString()
toString
in class java.lang.Object
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