| author | Jaroslav Tulach <jaroslav.tulach@apidesign.org> |
| Thu, 30 Oct 2014 21:30:10 +0100 | |
| changeset 409 | 40cabcdcd2be |
| parent 170 | 206cdfeefeec |
| permissions | -rw-r--r-- |
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package org.apidesign.visitor; |
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public final class Language {
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private Language() {
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} |
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public static abstract class Expression {
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Expression() {
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} |
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public abstract void visit(Visitor v); |
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} |
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public static final class Plus extends Expression {
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private final Expression first; |
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private final Expression second; |
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public Plus(Expression first, Expression second) {
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this.first = first; |
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this.second = second; |
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} |
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public Expression getFirst() {
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return first; |
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} |
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public Expression getSecond() {
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return second; |
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} |
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@Override |
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public void visit(Visitor v) {
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if (v instanceof Visitor10) {
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((Visitor10) v).visitPlus(this); |
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} else {
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v.visitUnknown(this); |
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} |
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} |
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} |
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public static final class Number extends Expression {
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private final int value; |
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public Number(int value) {
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this.value = value; |
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} |
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public int getValue() {
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return value; |
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} |
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@Override |
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public void visit(Visitor v) {
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if (v instanceof Visitor10) {
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((Visitor10) v).visitNumber(this); |
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} else {
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v.visitUnknown(this); |
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} |
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} |
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} |
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/** @since 2.0 */ |
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public static final class Minus extends Expression {
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private final Expression first; |
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private final Expression second; |
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public Minus(Expression first, Expression second) {
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this.first = first; |
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this.second = second; |
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} |
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public Expression getFirst() { return first; }
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public Expression getSecond() { return second; }
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// BEGIN: visitor.cleanversion.dispatch2 |
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public void visit(Visitor v) {
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if (v instanceof Visitor20) {
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((Visitor20)v).visitMinus(this); |
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} else {
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v.visitUnknown(this); |
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} |
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} |
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// END: visitor.cleanversion.dispatch2 |
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} |
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// BEGIN: visitor.cleanversion.v2 |
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public interface Visitor {
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public void visitUnknown(Expression e); |
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} |
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public interface Visitor10 extends Visitor {
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public void visitPlus(Plus s); |
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public void visitNumber(Number n); |
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} |
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/** @since 2.0 */ |
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public interface Visitor20 extends Visitor10 {
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public void visitMinus(Minus s); |
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} |
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// END: visitor.cleanversion.v2 |
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} |