RelationType

java.lang.Object
- ptolemy.domains.modal.kernel.RelationType

```
public final class RelationType
extends java.lang.Object
```
A static class contains a list of types for relation node. There are six different types:
```
 INVALID
 TRUE
 FALSE
 EQUAL_INEQUAL
 LESS_THAN
 GREATER_THAN
 
```
For a leaf node evaluated as a boolean token, its relationType is decided by the boolean value of the result boolean token: TRUE for true and FALSE for false.
For a relation node, (scalarLeft relationOperator scalarRight), the relationType depends on the relationOperator. If the relationOperator is '==' or '!=', the relationType can be EQUAL_INEQUAL indicating the two scalars equal or not equal; the relation type is LESS_THAN to indicate that the left scalar is less than the right one, and GREATER_THAN to indicate left scalar is bigger than the right one. For the other kinds of relation operators, the relationType is decided by the boolean value of the evaluation result, i.e., TRUE for true and FALSE for false.
The INVALID type is for a relation not evaluated yet.
Since:

Ptolemy II 8.0

Version:

$Id$

Author:

Haiyang Zheng

Pt.AcceptedRating:

Red (hyzheng)

Pt.ProposedRating:

Yellow (hyzheng)

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`EQUAL_INEQUAL`	Relation type a relation node that is evaluated to be true while the relation operation is not equal or inequal.
`static int`	`FALSE`	Relation type a relation node that is evaluated to be fale while the relation operation is not equal or inequal.
`static int`	`GREATER_THAN`	Relation type a relation node that is evaluated to be false and the left token is greater than the right token, while the relation operation is not equal or inequal.
`static int`	`INVALID`	Relation type a relation node that is not evaluated.
`static int`	`LESS_THAN`	Relation type a relation node that is evaluated to be false and the left token is less than the right token, while the relation operation is not equal or inequal.
`static int`	`TRUE`	Relation type a relation node that is evaluated to be true while the relation operation is not equal or inequal.

Constructor Summary

Constructors
Constructor Description

RelationType()

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

- Field Detail
  - INVALID
```
public static final int INVALID
```
    Relation type a relation node that is not evaluated.
    
    See Also:
    
    Constant Field Values
  - TRUE
```
public static final int TRUE
```
    Relation type a relation node that is evaluated to be true while the relation operation is not equal or inequal.
    
    See Also:
    
    Constant Field Values
  - FALSE
```
public static final int FALSE
```
    Relation type a relation node that is evaluated to be fale while the relation operation is not equal or inequal.
    
    See Also:
    
    Constant Field Values
  - EQUAL_INEQUAL
```
public static final int EQUAL_INEQUAL
```
    Relation type a relation node that is evaluated to be true while the relation operation is not equal or inequal.
    
    See Also:
    
    Constant Field Values
  - LESS_THAN
```
public static final int LESS_THAN
```
    Relation type a relation node that is evaluated to be false and the left token is less than the right token, while the relation operation is not equal or inequal.
    
    See Also:
    
    Constant Field Values
  - GREATER_THAN
```
public static final int GREATER_THAN
```
    Relation type a relation node that is evaluated to be false and the left token is greater than the right token, while the relation operation is not equal or inequal.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - RelationType
```
public RelationType()
```