Module org.apache.jena.arq
Package org.apache.jena.sparql.engine.binding

Interface Binding

All Known Implementing Classes:
Binding0, Binding1, Binding2, Binding3, Binding4, BindingBase, BindingOverMap, BindingProject, BindingProjectBase, BindingProjectNamed, BindingRoot
public interface Binding
Interface encapsulating a mapping from a name to a value.

A Binding is a map from Var to Node. It can have a parent, meaning this binding extends (adds new var/node pairs) another. The operation get(java.lang.String) looks in this binding, then looks in the parent recursively. Bindings are immutable. Bindings provide value-based equality and hash code.

See Also:

  • Field Details

    • noParent

      static final Binding noParent

  • Method Details

    • builder

      static BindingBuilder builder()
      Create a BindingBuilder

    • builder

      static BindingBuilder builder(Binding parent)
      Create a BindingBuilder

    • vars

      Iterator<Var> vars()
      Iterate over all variables of this binding.

    • forEach

      void forEach(BiConsumer<Var,Node> action)
      Operate on each entry.

    • contains

      boolean contains(Var var)
      Test whether a variable is bound to some object

    • get

      default Node get(String varName)
      Return the object bound to a variable, or null

    • contains

      default boolean contains(String varName)
      Test whether a variable is bound to some object

    • get

      Node get(Var var)
      Return the object bound to a variable, or null

    • size

      int size()
      Number of (var, value) pairs.

    • isEmpty

      boolean isEmpty()
      Is this an empty binding? No variables.

    • hashCode

      int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      boolean equals(Object other)
      Overrides:
      equals in class Object