commit f1507b1ff6bb1b5655ded6a42253ff5981ec7b5f
parent b0c76f4d1af96ba63c18417310a3d01f1f313d41
Author: Tomas Hlavaty <tom@logand.com>
Date: Sat, 26 Dec 2015 22:56:22 +0100
remove tabs
Diffstat:
5 files changed, 268 insertions(+), 270 deletions(-)
diff --git a/src/jmultimethod/AsteroidTest.java b/src/jmultimethod/AsteroidTest.java
@@ -4,81 +4,81 @@ package jmultimethod;
public class AsteroidTest {
- class Asteroid {}
-
- class Spaceship {}
-
- @Multi("collide")
- public void collideOO(Object X, Object Y) {
- log("?? Bang, what happened? ", X, Y);
- }
-
- @Multi("collide")
- public void collideAA(Asteroid X, Asteroid Y) {
- log("AA Look at the beautiful fireworks! ", X, Y);
- }
-
- @Multi("collide")
- public void collideAS(Asteroid X, Spaceship Y) {
- log("AS Is it fatal? ", X, Y);
- }
-
- @Multi("collide")
- public void collideSA(Spaceship X, Asteroid Y) {
- log("SA Is it fatal? ", X, Y);
- }
-
- @Multi("collide")
- public void collideSS(Spaceship X, Spaceship Y) {
- log("SS Who's fault was it? ", X, Y);
- }
-
- @Multi("collide")
- public void collide1S(String X, Spaceship Y) {
- log("1S any string? ", X, Y);
- }
-
- @Multi("collide")
- public void collide2S(@V("hi") String X, Spaceship Y) {
- log("2S 'hi' value? ", X, Y);
- }
-
- protected Multimethod mm = new Multimethod("collide", getClass());
-
- public void collide(Object X, Object Y) {
- mm.invoke(this, X, Y);
- }
-
- public void run() {
- Object A = new Asteroid();
- Object S = new Spaceship();
- collide(A, A);
- collide(A, S);
- collide(S, A);
- collide(S, S);
- collide(A, 1);
- collide(2, A);
- collide(S, 3);
- collide(4, S);
- collide(5, null);
- collide(null, null);
- collide("hi", S);
- collide("hello", S);
- }
-
- public void log(Object... args) {
- for(Object o: args) {
- if(o instanceof String) {
- System.out.print(" " + (String) o);
- } else {
- System.out.print(" " + o);
- }
- }
- System.out.println();
- }
-
- public static void main(String[] args) throws Exception {
- AsteroidTest t = new AsteroidTest();
- t.run();
- }
+ class Asteroid {}
+
+ class Spaceship {}
+
+ @Multi("collide")
+ public void collideOO(Object X, Object Y) {
+ log("?? Bang, what happened? ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collideAA(Asteroid X, Asteroid Y) {
+ log("AA Look at the beautiful fireworks! ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collideAS(Asteroid X, Spaceship Y) {
+ log("AS Is it fatal? ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collideSA(Spaceship X, Asteroid Y) {
+ log("SA Is it fatal? ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collideSS(Spaceship X, Spaceship Y) {
+ log("SS Who's fault was it? ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collide1S(String X, Spaceship Y) {
+ log("1S any string? ", X, Y);
+ }
+
+ @Multi("collide")
+ public void collide2S(@V("hi") String X, Spaceship Y) {
+ log("2S 'hi' value? ", X, Y);
+ }
+
+ protected Multimethod mm = new Multimethod("collide", getClass());
+
+ public void collide(Object X, Object Y) {
+ mm.invoke(this, X, Y);
+ }
+
+ public void run() {
+ Object A = new Asteroid();
+ Object S = new Spaceship();
+ collide(A, A);
+ collide(A, S);
+ collide(S, A);
+ collide(S, S);
+ collide(A, 1);
+ collide(2, A);
+ collide(S, 3);
+ collide(4, S);
+ collide(5, null);
+ collide(null, null);
+ collide("hi", S);
+ collide("hello", S);
+ }
+
+ public void log(Object... args) {
+ for(Object o: args) {
+ if(o instanceof String) {
+ System.out.print(" " + (String) o);
+ } else {
+ System.out.print(" " + o);
+ }
+ }
+ System.out.println();
+ }
+
+ public static void main(String[] args) throws Exception {
+ AsteroidTest t = new AsteroidTest();
+ t.run();
+ }
}
diff --git a/src/jmultimethod/CarTest.java b/src/jmultimethod/CarTest.java
@@ -4,97 +4,97 @@ package jmultimethod;
public class CarTest {
- interface CarElement {}
-
- class Wheel implements CarElement {
- private String name;
- Wheel(String name) {
- this.name = name;
- }
- String getName() {
- return this.name;
- }
- }
-
- class Engine implements CarElement {}
-
- class Body implements CarElement {}
-
- class Car {
- CarElement[] elements;
- public CarElement [] getElements() {
- return elements.clone();
- }
- public Car() {
- this.elements = new CarElement[]
- { new Wheel("front left"), new Wheel("front right"),
- new Wheel("back left") , new Wheel("back right"),
- new Body(), new Engine()};
- }
- }
-
- @Multi("visit")
- public void visitP(Wheel wheel, @V("print") String mode) {
- System.out.println("Visiting "+ wheel.getName() + " wheel");
- }
-
- @Multi("visit")
- public void visitP(Engine engine, @V("print") String mode) {
- System.out.println("Visiting engine");
- }
-
- @Multi("visit")
- public void visitP(Body body, @V("print") String mode) {
- System.out.println("Visiting body");
- }
-
- @Multi("visit")
- public void visitP(Car car, @V("print") String mode) {
- System.out.println("\nVisiting car");
- for(CarElement element : car.getElements()) {
- visit(element, mode);
- }
- System.out.println("Visited car");
- }
-
- @Multi("visit")
- public void visitD(Wheel wheel, @V("do") String mode) {
- System.out.println("Kicking my "+ wheel.getName());
- }
-
- @Multi("visit")
- public void visitD(Engine engine, @V("do") String mode) {
- System.out.println("Starting my engine");
- }
-
- @Multi("visit")
- public void visitD(Body body, @V("do") String mode) {
- System.out.println("Moving my body");
- }
-
- @Multi("visit")
- public void visitD(Car car, @V("do") String mode) {
- System.out.println("\nStarting my car");
- for(CarElement element : car.getElements()) {
- visit(element, mode);
- }
- System.out.println("Started car");
- }
-
- protected Multimethod mm = new Multimethod("visit", getClass());
-
- public void visit(Object any, String mode) {
- mm.invoke(this, any, mode);
- }
-
- public void run() {
- Car car = new Car();
- visit(car, "print");
- visit(car, "do");
- }
-
- static public void main(String[] args){
- CarTest t = new CarTest();
- t.run();
- }
+ interface CarElement {}
+
+ class Wheel implements CarElement {
+ private String name;
+ Wheel(String name) {
+ this.name = name;
+ }
+ String getName() {
+ return this.name;
+ }
+ }
+
+ class Engine implements CarElement {}
+
+ class Body implements CarElement {}
+
+ class Car {
+ CarElement[] elements;
+ public CarElement [] getElements() {
+ return elements.clone();
+ }
+ public Car() {
+ this.elements = new CarElement[]
+ { new Wheel("front left"), new Wheel("front right"),
+ new Wheel("back left") , new Wheel("back right"),
+ new Body(), new Engine()};
+ }
+ }
+
+ @Multi("visit")
+ public void visitP(Wheel wheel, @V("print") String mode) {
+ System.out.println("Visiting "+ wheel.getName() + " wheel");
+ }
+
+ @Multi("visit")
+ public void visitP(Engine engine, @V("print") String mode) {
+ System.out.println("Visiting engine");
+ }
+
+ @Multi("visit")
+ public void visitP(Body body, @V("print") String mode) {
+ System.out.println("Visiting body");
+ }
+
+ @Multi("visit")
+ public void visitP(Car car, @V("print") String mode) {
+ System.out.println("\nVisiting car");
+ for(CarElement element : car.getElements()) {
+ visit(element, mode);
+ }
+ System.out.println("Visited car");
+ }
+
+ @Multi("visit")
+ public void visitD(Wheel wheel, @V("do") String mode) {
+ System.out.println("Kicking my "+ wheel.getName());
+ }
+
+ @Multi("visit")
+ public void visitD(Engine engine, @V("do") String mode) {
+ System.out.println("Starting my engine");
+ }
+
+ @Multi("visit")
+ public void visitD(Body body, @V("do") String mode) {
+ System.out.println("Moving my body");
+ }
+
+ @Multi("visit")
+ public void visitD(Car car, @V("do") String mode) {
+ System.out.println("\nStarting my car");
+ for(CarElement element : car.getElements()) {
+ visit(element, mode);
+ }
+ System.out.println("Started car");
+ }
+
+ protected Multimethod mm = new Multimethod("visit", getClass());
+
+ public void visit(Object any, String mode) {
+ mm.invoke(this, any, mode);
+ }
+
+ public void run() {
+ Car car = new Car();
+ visit(car, "print");
+ visit(car, "do");
+ }
+
+ static public void main(String[] args){
+ CarTest t = new CarTest();
+ t.run();
+ }
}
diff --git a/src/jmultimethod/Multi.java b/src/jmultimethod/Multi.java
@@ -8,6 +8,5 @@ import java.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Multi {
-
- public String value();
+ public String value();
}
diff --git a/src/jmultimethod/Multimethod.java b/src/jmultimethod/Multimethod.java
@@ -8,107 +8,107 @@ import java.util.Comparator;
public class Multimethod {
- protected String name;
- protected final ArrayList<Method> methods = new ArrayList<Method>();
- protected final MethodComparator methodComparator = new MethodComparator();
+ protected String name;
+ protected final ArrayList<Method> methods = new ArrayList<Method>();
+ protected final MethodComparator methodComparator = new MethodComparator();
- public Multimethod(String name, Class... classes) {
- this.name = name;
- for(Class c: classes) {
- add(c);
- }
- }
+ public Multimethod(String name, Class... classes) {
+ this.name = name;
+ for(Class c: classes) {
+ add(c);
+ }
+ }
- public void add(Class c) {
- for(Method m: c.getMethods()) {
- for(Annotation ma: m.getAnnotations()) {
- if(ma instanceof Multi) {
- Multi g = (Multi) ma;
- if(this.name.equals(g.value())) {
- methods.add(m);
- }
- }
- }
- }
- sort();
- }
+ public void add(Class c) {
+ for(Method m: c.getMethods()) {
+ for(Annotation ma: m.getAnnotations()) {
+ if(ma instanceof Multi) {
+ Multi g = (Multi) ma;
+ if(this.name.equals(g.value())) {
+ methods.add(m);
+ }
+ }
+ }
+ }
+ sort();
+ }
- protected void sort() {
- Method[] a = new Method[methods.size()];
- methods.toArray(a);
- Arrays.sort(a, methodComparator);
- methods.clear();
- for(Method m: a) {
- methods.add(m);
- }
- }
+ protected void sort() {
+ Method[] a = new Method[methods.size()];
+ methods.toArray(a);
+ Arrays.sort(a, methodComparator);
+ methods.clear();
+ for(Method m: a) {
+ methods.add(m);
+ }
+ }
- protected class MethodComparator implements Comparator<Method> {
- @Override
- public int compare(Method l, Method r) {
- // most specific methods first
- Class[] lc = l.getParameterTypes();
- Class[] rc = r.getParameterTypes();
- for(int i = 0; i < lc.length; i++) {
- String lv = value(l, i);
- String rv = value(r, i);
- if(lv == null) {
- if(rv != null) {
- return 1;
- }
- }
- if(lc[i].isAssignableFrom(rc[i])) {
- return 1;
- }
- }
- return -1;
- }
- }
+ protected class MethodComparator implements Comparator<Method> {
+ @Override
+ public int compare(Method l, Method r) {
+ // most specific methods first
+ Class[] lc = l.getParameterTypes();
+ Class[] rc = r.getParameterTypes();
+ for(int i = 0; i < lc.length; i++) {
+ String lv = value(l, i);
+ String rv = value(r, i);
+ if(lv == null) {
+ if(rv != null) {
+ return 1;
+ }
+ }
+ if(lc[i].isAssignableFrom(rc[i])) {
+ return 1;
+ }
+ }
+ return -1;
+ }
+ }
- protected String value(Method method, int arg) {
- Annotation[] a = method.getParameterAnnotations()[arg];
- for(Annotation p: a) {
- if(p instanceof V) {
- V v = (V) p;
- return v.value();
- }
- }
- return null;
- }
+ protected String value(Method method, int arg) {
+ Annotation[] a = method.getParameterAnnotations()[arg];
+ for(Annotation p: a) {
+ if(p instanceof V) {
+ V v = (V) p;
+ return v.value();
+ }
+ }
+ return null;
+ }
- protected boolean isApplicable(Method method, Object... args) {
- Class[] c = method.getParameterTypes();
- for(int i = 0; i < c.length; i++) {
- // must be instanceof and equal to annotated value if present
- if(c[i].isInstance(args[i])) {
- String v = value(method, i);
- if(v != null && !v.equals(args[i])) {
- return false;
- }
- } else {
- if(args[i] != null || !Object.class.equals(c[i])) {
- return false;
- }
- }
- }
- return true;
- }
+ protected boolean isApplicable(Method method, Object... args) {
+ Class[] c = method.getParameterTypes();
+ for(int i = 0; i < c.length; i++) {
+ // must be instanceof and equal to annotated value if present
+ if(c[i].isInstance(args[i])) {
+ String v = value(method, i);
+ if(v != null && !v.equals(args[i])) {
+ return false;
+ }
+ } else {
+ if(args[i] != null || !Object.class.equals(c[i])) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
- public Object invoke(Object self, Object... args) {
- Method m = null; // first applicable method (most specific)
- for(Method method: methods) {
- if(isApplicable(method, args)) {
- m = method;
- break;
- }
- }
- if(m == null) {
- throw new RuntimeException("No applicable method '" + name + "'.");
- }
- try {
- return m.invoke(self, args);
- } catch (Exception e) {
- throw new RuntimeException("Method invocation failed '" + name + "'.");
- }
- }
+ public Object invoke(Object self, Object... args) {
+ Method m = null; // first applicable method (most specific)
+ for(Method method: methods) {
+ if(isApplicable(method, args)) {
+ m = method;
+ break;
+ }
+ }
+ if(m == null) {
+ throw new RuntimeException("No applicable method '" + name + "'.");
+ }
+ try {
+ return m.invoke(self, args);
+ } catch (Exception e) {
+ throw new RuntimeException("Method invocation failed '" + name + "'.");
+ }
+ }
}
diff --git a/src/jmultimethod/V.java b/src/jmultimethod/V.java
@@ -8,6 +8,5 @@ import java.lang.annotation.Target;
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface V {
-
- public String value();
+ public String value();
}
