Handler (cpg 1.4.0 API)

java.lang.Object
- de.fraunhofer.aisec.cpg.frontends.Handler<S,T,L>

Type Parameters:

S - the result node or a collection of nodes

T - the raw ast node specific to the parser

L - the language frontend

Direct Known Subclasses:

DeclarationHandler, DeclarationHandler, ExpressionHandler, InitializerHandler, ParameterDeclarationHandler, StatementAnalyzer
```
public abstract class Handler<S,T,L extends LanguageFrontend>
extends java.lang.Object
```
A Handler is an abstract base class for a class that translates AST nodes from a raw ast type, usually supplied by a language parser into our generic CPG nodes.

Field Summary

Fields
Modifier and Type	Field	Description
`protected L`	`lang`
`protected static org.slf4j.Logger`	`log`
`protected java.util.HashMap<java.lang.Class<? extends T>,HandlerInterface<S,T>>`	`map`

Constructor Summary

Constructors
Constructor Description

Handler(java.util.function.Supplier<S> configConstructor, L lang)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

S handle(T ctx)
Searches for a handler matching the most specific superclass of Handler.
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - log
```
protected static final org.slf4j.Logger log
```
  - map
```
protected final java.util.HashMap<java.lang.Class<? extends T>,HandlerInterface<S,T>> map
```
  - lang
```
protected L extends LanguageFrontend lang
```
- Constructor Detail
  - Handler
```
public Handler(java.util.function.Supplier<S> configConstructor,
               L lang)
```
- Method Detail
  - handle
```
public S handle(T ctx)
```
    Searches for a handler matching the most specific superclass of Handler. The created map should thus contain a handler for every semantically different AST node and can reuse handler code as long as the handled AST nodes have a common ancestor.
    
    Parameters:
    
    ctx - The AST node, whose handler is matched with respect to the AST node class.
    
    Returns:
    
    most specific handler.