Package org.eclipse.rdf4j.query.impl
Class EmptyBindingSet
- java.lang.Object
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- org.eclipse.rdf4j.query.impl.EmptyBindingSet
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- All Implemented Interfaces:
java.io.Serializable,java.lang.Iterable<Binding>,BindingSet
public class EmptyBindingSet extends java.lang.Object implements BindingSet
An immutable empty BindingSet.- See Also:
- Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static classEmptyBindingSet.EmptyBindingIterator
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Field Summary
Fields Modifier and Type Field Description private EmptyBindingSet.EmptyBindingIteratoriterprivate static longserialVersionUIDprivate static EmptyBindingSetsingleton
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Constructor Summary
Constructors Constructor Description EmptyBindingSet()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description booleanequals(java.lang.Object o)Compares a BindingSet object to another object.BindinggetBinding(java.lang.String bindingName)Gets the binding with the specified name from this BindingSet.java.util.Set<java.lang.String>getBindingNames()Gets the names of the bindings in this BindingSet.static BindingSetgetInstance()ValuegetValue(java.lang.String bindingName)Gets the value of the binding with the specified name from this BindingSet.booleanhasBinding(java.lang.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:java.util.Iterator<Binding>iterator()Creates an iterator over the bindings in this BindingSet.intsize()Returns the number of bindings in this BindingSet.java.lang.StringtoString()-
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.query.BindingSet
isEmpty
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Field Detail
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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singleton
private static final EmptyBindingSet singleton
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iter
private final EmptyBindingSet.EmptyBindingIterator iter
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Method Detail
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getInstance
public static BindingSet getInstance()
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iterator
public java.util.Iterator<Binding> iterator()
Description copied from interface:BindingSetCreates 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.- Specified by:
iteratorin interfaceBindingSet- Specified by:
iteratorin interfacejava.lang.Iterable<Binding>
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getBindingNames
public java.util.Set<java.lang.String> getBindingNames()
Description copied from interface:BindingSetGets the names of the bindings in this BindingSet.- Specified by:
getBindingNamesin interfaceBindingSet- Returns:
- A set of binding names.
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getBinding
public Binding getBinding(java.lang.String bindingName)
Description copied from interface:BindingSetGets the binding with the specified name from this BindingSet.- Specified by:
getBindingin interfaceBindingSet- 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
public boolean hasBinding(java.lang.String bindingName)
Description copied from interface:BindingSetChecks whether this BindingSet has a binding with the specified name.- Specified by:
hasBindingin interfaceBindingSet- 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
public Value getValue(java.lang.String bindingName)
Description copied from interface:BindingSetGets the value of the binding with the specified name from this BindingSet.- Specified by:
getValuein interfaceBindingSet- 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
public int size()
Description copied from interface:BindingSetReturns the number of bindings in this BindingSet.- Specified by:
sizein interfaceBindingSet- Returns:
- The number of bindings in this BindingSet.
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equals
public boolean equals(java.lang.Object o)
Description copied from interface:BindingSetCompares a BindingSet object to another object.- Specified by:
equalsin interfaceBindingSet- Overrides:
equalsin classjava.lang.Object- 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
public int hashCode()
Description copied from interface:BindingSetThe 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.
- Specified by:
hashCodein interfaceBindingSet- Overrides:
hashCodein classjava.lang.Object- Returns:
- A hash code for the BindingSet.
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toString
public java.lang.String toString()
- Overrides:
toStringin classjava.lang.Object
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