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## com.hp.hpl.jena.graph.query
Class Bound

    java.lang.Object
      com.hp.hpl.jena.graph.query.Element
          com.hp.hpl.jena.graph.query.Bound

    public class Bound

extends Element

An element which represents an already-bound variable.

Author:
  hedgehog

Field Summary

Fields inherited from class com.hp.hpl.jena.graph.query.Element
`ANY`

Constructor Summary
`Bound(int n)` Initialise a Bound element: remember `n` as it is the index into the Domain at which its value is stored.

Method Summary
`Node` | `asNodeMatch(Domain d)` Answer a Node suitable as a pattern-match element in a TripleMatch approximating this Element.
`boolean` | `match(Domain d, Node x)` Answer true iff the node `x` matches the previously-seen value at Donain[index].
`java.lang.String` | `toString()`

Methods inherited from class com.hp.hpl.jena.graph.query.Element
`getIndex`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Bound

    public Bound(int n)

  Initialise a Bound element: remember `n` as it is the index into the Domain at which its value is stored.

Method Detail

### match

    public boolean match(Domain d,
                         Node x)

  Answer true iff the node `x` matches the previously-seen value at Donain[index]. The matching uses datatype-value semantics, implemented by `Node::sameValueAs()`.

  Specified by:
    `match` in class `Element`
  Parameters:
    `d` - the variable bindings to read/update for variables
    `x` - the value to match
  Returns:
    true if the match succeeded

### asNodeMatch

    public Node asNodeMatch(Domain d)

  Description copied from class: `Element`
  Answer a Node suitable as a pattern-match element in a TripleMatch approximating this Element. Thus Bind elements map to null (or Node.ANY).

  Specified by:
    `asNodeMatch` in class `Element`
  Parameters:
    `d` - the domain holding the variable bindings
  Returns:
    the matched value (null if none, ie binding occurance or ANY)

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `Element`

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