Node

java.lang.Object
- ptolemy.graph.Element
- - ptolemy.graph.Node

```
public final class Node
extends Element
```
An optionally-weighted node for an undirected or directed graph. More specifically, a node consists of an optional weight (an arbitrary object that is associated with the node). We say that a node is unweighted if it does not have an assigned weight. It is an error to attempt to access the weight of an unweighted node. Node weights must be genuine (non-null) objects.

Since:

Ptolemy II 2.0

Version:

$Id$

Author:

Shuvra S. Bhattacharyya

See Also:

Edge

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Red (cxh)

Field Summary
- Fields inherited from class ptolemy.graph.Element
  _weight

Constructor Summary

Constructors
Constructor Description

Node()
Construct an unweighted node.

Node(java.lang.Object weight)
Construct a node with a given node weight.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`descriptor()`	A one-word description of the type of this graph element.
`java.lang.String`	`toString()`	Return a string representation of the node.

Methods inherited from class ptolemy.graph.Element
getWeight, hasWeight, removeWeight, setWeight

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

- Constructor Detail
  - Node
```
public Node()
```
    Construct an unweighted node.
  - Node
```
public Node(java.lang.Object weight)
```
    Construct a node with a given node weight.
    
    Parameters:
    
    weight - The given weight.
    
    Throws:
    
    java.lang.IllegalArgumentException - If the specified weight is null.
- Method Detail
  - descriptor
```
public java.lang.String descriptor()
```
    A one-word description of the type of this graph element.
    
    Overrides:
    
    descriptor in class Element
    
    Returns:
    
    The description.
  - toString
```
public java.lang.String toString()
```
    Return a string representation of the node. The string representation is simply a representation of the node weight (or the string "<unweighted node>" if the node is unweighted.
    
    Overrides:
    
    toString in class java.lang.Object