net.hl.compiler.ast

Class HNApplyCastOperator

java.lang.Object

net.thevpc.jeep.core.nodes.AbstractJNode

net.hl.compiler.ast.HNode

net.hl.compiler.ast.HNUnused

net.hl.compiler.ast.HNApplyCastOperator

All Implemented Interfaces:

net.thevpc.jeep.JNode

public class HNApplyCastOperator
extends HNUnused

cast types . We distinguish three types of cast : implicit cast and explicit cast and nullable cast.

Explicit cast is a bare checking (equivalent to java's cast)

Implicit cast can convert one type to another using in order one of the following methods when available. Lets take the example of casting a of type A to class B

• instance method in A that returns B

  def B A.as(Class<B>)

• constructor in B

  B(A a)

• static method that returns B

  static B cast(A a,Class<B>)

Examples of explicit casts

1. Example 1:

         Car c=Maseratti();
         Maseratti m=(Maseratti)c; //here is the explicit cast
         Volvo v=(Volvo?)c; //this will return zero without exception
                            //this is an explicit nullable cast
         

2. Example 2:

         double c=2.0;
         int m=(int)c; //actually this is an implicit cast done
                     //by the jvm/java so it is considered as
                     //explicit cast
         

Examples of implicit casts

1. Example 1:

         Car c=Maseratti();
         Maseratti m=c; // here is the implicit cast
                        // that will check through
                        // the three possibilities
         

   Note that
2. Example 2:

         Car c=Maseratti();
         Maseratti m=c.as(Maseratti); // here is the implicit cast
                                    // that will check through
                                    // the three possibilities as well
         

3. Example 3:

         Car c=Maseratti();
         Volvo m=c.as(Volvo?); // here is the implicit cast
                                    // that will check through
                                    // the three possibilities as well
                                    //but will return null if unavailable cast
         

4. Example 4:

         def sum(Complex a,Complex b){
             return a+b;
         }
         class Complex(double real,double imag){
             constructor(double real)->this(real,0);
             def Complex +(Complex o)->Complex(real+o.real,imag+o.imag);
             def Complex reverse_+(Complex o)->Complex(real+o.real,imag+o.imag);
         }
         int a=3;
         var c=a+Complex(2,3); // here is an implicit cast
                               // that will check through
                               // the tree possibilities
                               //and will choose #2 (constructor)
         Complex equivalent_c= Complex(2,3).reverse_plus(Complex((double)a));
         

Constructor Summary

Constructors

Constructor and Description
HNApplyCastOperator(HNode expr, net.thevpc.jeep.JTypeName castType, net.thevpc.jeep.JToken startToken, net.thevpc.jeep.JToken endToken)

Method Summary

Modifier and Type	Method and Description
void	copyFrom(net.thevpc.jeep.JNode node, net.thevpc.jeep.JNodeCopyFactory copyFactory)
protected void	findAndReplaceChildren(net.thevpc.jeep.JNodeFindAndReplace findAndReplace)
net.thevpc.jeep.JTypeName	getCastType()
List<net.thevpc.jeep.JNode>	getChildrenNodes()
HNode	getExpr()
HNApplyCastOperator	setCastType(net.thevpc.jeep.JTypeName castType)
HNApplyCastOperator	setExpr(HNode expr)
String	toString()

Methods inherited from class net.hl.compiler.ast.HNode

addAnnotationNoDuplicates, addAnnotations, addAnnotationsNoDuplicates, addModifierKeys, copy, copy, fullChildInfo, getAnnotations, getEffectiveImports, getElement, getExitPoints, getImports, getModifierKeys, getParentNode, id, removeAnnotations, setAnnotations, setElement, setImports

Methods inherited from class net.thevpc.jeep.core.nodes.AbstractJNode

containsCaret, containsCaret, copyFrom, findAndReplace, getChildInfo, getEndToken, getExitContextObject, getPosition, getPosition, getSeparators, getStartToken, getUserObjects, isExitContext, isSetUserObject, isTestAndSetUserObject, parentNode, setBounds, setChildInfo, setEndToken, setExitContextObject, setSeparators, setStartToken, setUserObject, setUserObject, setUserObject, unsetUserObject, visit, visitNext, visitNext, visitNext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

HNApplyCastOperator

public HNApplyCastOperator(HNode expr,
                           net.thevpc.jeep.JTypeName castType,
                           net.thevpc.jeep.JToken startToken,
                           net.thevpc.jeep.JToken endToken)

Method Detail

getCastType

public net.thevpc.jeep.JTypeName getCastType()

getExpr

public HNode getExpr()

setExpr

public HNApplyCastOperator setExpr(HNode expr)

setCastType

public HNApplyCastOperator setCastType(net.thevpc.jeep.JTypeName castType)

toString

public String toString()

Overrides:

toString in class Object

findAndReplaceChildren

protected void findAndReplaceChildren(net.thevpc.jeep.JNodeFindAndReplace findAndReplace)

Overrides:

findAndReplaceChildren in class net.thevpc.jeep.core.nodes.AbstractJNode

copyFrom

public void copyFrom(net.thevpc.jeep.JNode node,
                     net.thevpc.jeep.JNodeCopyFactory copyFactory)

Specified by:

copyFrom in interface net.thevpc.jeep.JNode

Overrides:

copyFrom in class HNode

getChildrenNodes

public List<net.thevpc.jeep.JNode> getChildrenNodes()

Specified by:

getChildrenNodes in interface net.thevpc.jeep.JNode

Overrides:

getChildrenNodes in class net.thevpc.jeep.core.nodes.AbstractJNode