Package org.eclipse.rdf4j.query.algebra
Class ZeroLengthPath
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.query.algebra.ZeroLengthPath
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- All Implemented Interfaces:
Serializable,Cloneable,GraphPatternGroupable,QueryModelNode,TupleExpr,VariableScopeChange
public class ZeroLengthPath extends AbstractQueryModelNode implements TupleExpr
A tuple expression that matches a path of length zero against an RDF graph. They can can be targeted at one of three context scopes: all contexts, null context only, or named contexts only.- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description ZeroLengthPath()ZeroLengthPath(StatementPattern.Scope scope, Var subject, Var object)Creates a zero-length path that matches a subject-, predicate- and object variable against statements from the specified context scope.ZeroLengthPath(StatementPattern.Scope scope, Var subjVar, Var objVar, Var conVar)Creates a zero-length path that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.ZeroLengthPath(Var subject, Var object)Creates a zero-length path that matches a subject-, predicate- and object variable against statements from all contexts.ZeroLengthPath(Var subject, Var object, Var context)Creates a zero-length path that matches a subject-, predicate-, object- and context variable against statements from all contexts.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ZeroLengthPathclone()Returns a (deep) clone of this query model node.booleanequals(Object other)Returns true if this query model node and its children are recursively equal to o and its children.Set<String>getAssuredBindingNames()Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.Set<String>getBindingNames()Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.VargetContextVar()Returns the context variable, if available.VargetObjectVar()StatementPattern.ScopegetScope()Gets the context scope for the zero-length path.StringgetSignature()Default implementation ofQueryModelNode.getSignature()that prints the name of the node's class.VargetSubjectVar()List<Var>getVarList()<L extends Collection<Var>>
LgetVars(L varCollection)Adds the variables of this statement pattern to the supplied collection.inthashCode()voidreplaceChildNode(QueryModelNode current, QueryModelNode replacement)Default implementation ofQueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode)that throws anIllegalArgumentExceptionindicating that current is not a child node of this node.voidsetContextVar(Var context)voidsetObjectVar(Var object)voidsetScope(StatementPattern.Scope scope)Sets the context scope for the zero-length pathvoidsetSubjectVar(Var subject)<X extends Exception>
voidvisit(QueryModelVisitor<X> visitor)Visits this node.<X extends Exception>
voidvisitChildren(QueryModelVisitor<X> visitor)Dummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)that does nothing.-
Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode
getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Detail
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ZeroLengthPath
public ZeroLengthPath()
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ZeroLengthPath
public ZeroLengthPath(Var subject, Var object)
Creates a zero-length path that matches a subject-, predicate- and object variable against statements from all contexts.
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ZeroLengthPath
public ZeroLengthPath(StatementPattern.Scope scope, Var subject, Var object)
Creates a zero-length path that matches a subject-, predicate- and object variable against statements from the specified context scope.
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ZeroLengthPath
public ZeroLengthPath(Var subject, Var object, Var context)
Creates a zero-length path that matches a subject-, predicate-, object- and context variable against statements from all contexts.
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ZeroLengthPath
public ZeroLengthPath(StatementPattern.Scope scope, Var subjVar, Var objVar, Var conVar)
Creates a zero-length path that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.
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Method Detail
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getScope
public StatementPattern.Scope getScope()
Gets the context scope for the zero-length path.
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setScope
public void setScope(StatementPattern.Scope scope)
Sets the context scope for the zero-length path
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getSubjectVar
public Var getSubjectVar()
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setSubjectVar
public void setSubjectVar(Var subject)
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getObjectVar
public Var getObjectVar()
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setObjectVar
public void setObjectVar(Var object)
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getContextVar
public Var getContextVar()
Returns the context variable, if available.
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setContextVar
public void setContextVar(Var context)
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getBindingNames
public Set<String> getBindingNames()
Description copied from interface:TupleExprGets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.- Specified by:
getBindingNamesin interfaceTupleExpr- Returns:
- A set of binding names.
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getAssuredBindingNames
public Set<String> getAssuredBindingNames()
Description copied from interface:TupleExprGets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.- Specified by:
getAssuredBindingNamesin interfaceTupleExpr- Returns:
- A set of binding names.
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getVars
public <L extends Collection<Var>> L getVars(L varCollection)
Adds the variables of this statement pattern to the supplied collection.
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visit
public <X extends Exception> void visit(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from interface:QueryModelNodeVisits this node. The node reports itself to the visitor with the proper runtime type.- Specified by:
visitin interfaceQueryModelNode- Throws:
X extends Exception
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visitChildren
public <X extends Exception> void visitChildren(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from class:AbstractQueryModelNodeDummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)that does nothing. Subclasses should override this method when they have child nodes.- Specified by:
visitChildrenin interfaceQueryModelNode- Overrides:
visitChildrenin classAbstractQueryModelNode- Throws:
X extends Exception
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replaceChildNode
public void replaceChildNode(QueryModelNode current, QueryModelNode replacement)
Description copied from class:AbstractQueryModelNodeDefault implementation ofQueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode)that throws anIllegalArgumentExceptionindicating that current is not a child node of this node.- Specified by:
replaceChildNodein interfaceQueryModelNode- Overrides:
replaceChildNodein classAbstractQueryModelNode- Parameters:
current- The current child node.replacement- The new child node.
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getSignature
public String getSignature()
Description copied from class:AbstractQueryModelNodeDefault implementation ofQueryModelNode.getSignature()that prints the name of the node's class.- Specified by:
getSignaturein interfaceQueryModelNode- Overrides:
getSignaturein classAbstractQueryModelNode- Returns:
- The node's signature, e.g. SLICE (offset=10, limit=10).
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equals
public boolean equals(Object other)
Description copied from interface:QueryModelNodeReturns true if this query model node and its children are recursively equal to o and its children.- Specified by:
equalsin interfaceQueryModelNode- Overrides:
equalsin classObject
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clone
public ZeroLengthPath clone()
Description copied from interface:QueryModelNodeReturns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clonein interfaceQueryModelNode- Specified by:
clonein interfaceTupleExpr- Overrides:
clonein classAbstractQueryModelNode- Returns:
- A deep clone of this query model node.
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