1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/visitor/11-cleanversion/src-api2.0/org/apidesign/visitor/Language.java	Sat Jun 14 09:58:52 2008 +0200
     1.3 @@ -0,0 +1,63 @@
     1.4 +package org.apidesign.visitor;
     1.5 +
     1.6 +public final class Language {
     1.7 +    private Language() { }
     1.8 +    
     1.9 +    public static abstract class Expression {
    1.10 +        public abstract void visit(Visitor v);
    1.11 +    }
    1.12 +    public static final class Plus extends Expression {
    1.13 +        private final Expression first;
    1.14 +        private final Expression second;
    1.15 +        
    1.16 +        public Plus(Expression first, Expression second) {
    1.17 +            this.first = first;
    1.18 +            this.second = second;
    1.19 +        }
    1.20 +        public Expression getFirst() { return first; }
    1.21 +        public Expression getSecond() { return second; }
    1.22 +        @Override
    1.23 +        public void visit(Visitor v) { v.visitPlus(this); }
    1.24 +    }
    1.25 +    public static final class Number extends Expression {
    1.26 +        private final int value;
    1.27 +        public Number(int value) { this.value = value; }
    1.28 +        public int getValue() { return value; }
    1.29 +        @Override
    1.30 +        public void visit(Visitor v) { v.visitNumber(this); }
    1.31 +    }
    1.32 +    /** @since 2.0 */
    1.33 +    public static final class Minus extends Expression {
    1.34 +        private final Expression first;
    1.35 +        private final Expression second;
    1.36 +        
    1.37 +        public Minus(Expression first, Expression second) {
    1.38 +            this.first = first;
    1.39 +            this.second = second;
    1.40 +        }
    1.41 +        public Expression getFirst() { return first; }
    1.42 +        public Expression getSecond() { return second; }
    1.43 +        
    1.44 +        // BEGIN: visitor.cleanversion.dispatch2
    1.45 +        public void visit(Visitor v) { 
    1.46 +            if (v instanceof Visitor2_0) {
    1.47 +                ((Visitor2_0)v).visitMinus(this);
    1.48 +            } else {
    1.49 +                v.visitUnknown(this);
    1.50 +            }
    1.51 +        }
    1.52 +        // END: visitor.cleanversion.dispatch2
    1.53 +    }
    1.54 +
    1.55 +    // BEGIN: visitor.cleanversion.v2
    1.56 +    public interface Visitor {
    1.57 +        public void visitUnknown(Expression e);
    1.58 +        public void visitPlus(Plus s);
    1.59 +        public void visitNumber(Number n);
    1.60 +    }
    1.61 +    /** @since 2.0 */
    1.62 +    public interface Visitor2_0 extends Visitor {
    1.63 +        public void visitMinus(Minus s);
    1.64 +    }
    1.65 +    // END: visitor.cleanversion.v2
    1.66 +}