DetectRootRulesVisitor (edigen 1.5.2 API)

java.lang.Object
- net.emustudio.edigen.Visitor
- - net.emustudio.edigen.passes.DetectRootRulesVisitor

```
public class DetectRootRulesVisitor
extends Visitor
```
Detects root rules, including undefined root rules. If one or more undefined root rules are found, an exception is thrown.

Constructor Summary

Constructors
Constructor Description

DetectRootRulesVisitor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`visit(Decoder decoder)`
`void`	`visit(Rule rule)`	Assigns rule objects to the mapping of names to objects.

Methods inherited from class net.emustudio.edigen.Visitor
visit, visit, visit, visit, visit, visit, visit, visit, visit

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

- Constructor Detail
  - DetectRootRulesVisitor
```
public DetectRootRulesVisitor()
```
- Method Detail
  - visit
```
public void visit(Decoder decoder)
           throws SemanticException
```
    Overrides:
    
    visit in class Visitor
    
    Throws:
    
    SemanticException
  - visit
```
public void visit(Rule rule)
           throws SemanticException
```
    Assigns rule objects to the mapping of names to objects. Also checks if some declared root rule name points to already declared rule with another name. If this case isn't catched, there will be practically multiple tries of decoding the same thing - if it failed once, it certainly fails second time (we assume reading memory is idempotent).
    
    Overrides:
    
    visit in class Visitor
    
    Parameters:
    
    rule - rule object
    
    Throws:
    
    SemanticException - if the rule was already declared as root