jtulach@176: package org.apidesign.visitor;
jtulach@176: 
jtulach@176: public final class Language {
jtulach@176:     private Language() { }
jtulach@176:     
jtulach@176:     // BEGIN: visitor.clientprovider.v1
jtulach@176:     public interface Expression {
jtulach@176:         public abstract void visit(Visitor v);
jtulach@176:     }
jtulach@176:     public interface Plus extends Expression {
jtulach@176:         public Expression getFirst();
jtulach@176:         public Expression getSecond();
jtulach@176:     }
jtulach@176:     public interface Number extends Expression {
jtulach@176:         public int getValue();
jtulach@176:     }
jtulach@176: 
jtulach@176:     public static abstract class Visitor {
jtulach@176:         Visitor() {}
jtulach@176: 
jtulach@266:         public static Visitor create(Version10 v) {
jtulach@266:             return create10(v);
jtulach@176:         }
jtulach@176: 
jtulach@266:         public interface Version10 {
jtulach@176:             public boolean visitUnknown(Expression e);
jtulach@176:             public void visitPlus(Plus s);
jtulach@176:             public void visitNumber(Number n);
jtulach@176:         }
jtulach@176: 
jtulach@176:         public abstract void dispatchPlus(Plus p);
jtulach@176:         public abstract void dispatchNumber(Number n);
jtulach@176:     }
jtulach@176:     // END: visitor.clientprovider.v1
jtulach@176:     
jtulach@266:     static Visitor create10(final Visitor.Version10 v) {
jtulach@176:         return new Visitor() {
jtulach@176:             @Override
jtulach@176:             public void dispatchPlus(Plus p) {
jtulach@176:                 v.visitPlus(p);
jtulach@176:             }
jtulach@176: 
jtulach@176:             @Override
jtulach@176:             public void dispatchNumber(Number n) {
jtulach@176:                 v.visitNumber(n);
jtulach@176:             }
jtulach@176:         };
jtulach@176:     }
jtulach@176: }