Package org.eclipse.rdf4j.query
Interface BindingSet
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- All Superinterfaces:
Iterable<Binding>,Serializable
- All Known Subinterfaces:
MutableBindingSet
- All Known Implementing Classes:
AbstractBindingSet,ArrayBindingSet,EmptyBindingSet,FedXPathIteration.ValuePair,ListBindingSet,MapBindingSet,PathIteration.ValuePair,QueryBindingSet,SimpleBindingSet,SingletonBindingSet,SPARQLQueryBindingSet
public interface BindingSet extends Iterable<Binding>, Serializable
A BindingSet is a set of named value bindings, which is used a.o. to represent a single query solution. Values are indexed by name of the binding which typically corresponds to the names of the variables used in the projection of the orginal query.
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Method Summary
All Methods Instance Methods Abstract Methods Default Methods Modifier and Type Method Description booleanequals(Object o)Compares a BindingSet object to another object.BindinggetBinding(String bindingName)Gets the binding with the specified name from this BindingSet.Set<String>getBindingNames()Gets the names of the bindings in this BindingSet.ValuegetValue(String bindingName)Gets the value of the binding with the specified name from this BindingSet.booleanhasBinding(String bindingName)Checks whether this BindingSet has a binding with the specified name.inthashCode()The hash code of a binding is defined as the bit-wise XOR of the hash codes of its bindings:default booleanisEmpty()Iterator<Binding>iterator()Creates an iterator over the bindings in this BindingSet.intsize()Returns the number of bindings in this BindingSet.-
Methods inherited from interface java.lang.Iterable
forEach, spliterator
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Method Detail
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iterator
Iterator<Binding> iterator()
Creates an iterator over the bindings in this BindingSet. This only returns bindings with non-null values. An implementation is free to return the bindings in arbitrary order.
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getBindingNames
Set<String> getBindingNames()
Gets the names of the bindings in this BindingSet.- Returns:
- A set of binding names.
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getBinding
Binding getBinding(String bindingName)
Gets the binding with the specified name from this BindingSet.- Parameters:
bindingName- The name of the binding.- Returns:
- The binding with the specified name, or null if there is no such binding in this BindingSet.
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hasBinding
boolean hasBinding(String bindingName)
Checks whether this BindingSet has a binding with the specified name.- Parameters:
bindingName- The name of the binding.- Returns:
- true if this BindingSet has a binding with the specified name, false otherwise.
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getValue
Value getValue(String bindingName)
Gets the value of the binding with the specified name from this BindingSet.- Parameters:
bindingName- The name of the binding.- Returns:
- The value of the binding with the specified name, or null if there is no such binding in this BindingSet.
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size
int size()
Returns the number of bindings in this BindingSet.- Returns:
- The number of bindings in this BindingSet.
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equals
boolean equals(Object o)
Compares a BindingSet object to another object.- Overrides:
equalsin classObject- Parameters:
o- The object to compare this binding to.- Returns:
- true if the other object is an instance of
BindingSetand it contains the same set of bindings (disregarding order), false otherwise.
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hashCode
int hashCode()
The hash code of a binding is defined as the bit-wise XOR of the hash codes of its bindings:int hashCode = 0; for (Binding binding : this) { hashCode ˆ= binding.getName().hashCode() ˆ binding.getValue().hashCode(); }Note: the calculated hash code intentionally does not depend on the order in which the bindings are iterated over.
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isEmpty
default boolean isEmpty()
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