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elebras1elebras1
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fix : fix children method + improve relation method
1 parent 987d5a1 commit 8e809b9

2 files changed

Lines changed: 94 additions & 40 deletions

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‎examples/src/main/java/com/github/elebras1/flecs/examples/RelationsExample.java‎

Lines changed: 82 additions & 39 deletions
Original file line numberDiff line numberDiff line change
@@ -10,59 +10,102 @@ public static void main(String[] args) {
1010
try (World world = new World()) {
1111
world.component(Position.class);
1212

13-
Entity root = world.obtainEntity(world.entity("Root"));
14-
root.set(new Position(0, 0));
13+
childOfHierarchy(world);
14+
parentHierarchy(world);
15+
customRelationships(world);
16+
isaInheritance(world);
17+
}
18+
}
1519

16-
Entity child1 = world.obtainEntity(world.entity("Child1"));
17-
child1.set(new Position(10, 10));
18-
child1.childOf(root);
20+
private static void childOfHierarchy(World world) {
21+
System.out.println("=== ChildOf Hierarchy ===");
1922

20-
Entity child2 = world.obtainEntity(world.entity("Child2"));
21-
child2.set(new Position(20, 20));
22-
child2.childOf(root);
23+
Entity scene = world.obtainEntity(world.entity("Scene"));
24+
scene.set(new Position(0, 0));
2325

24-
Entity grandchild = world.obtainEntity(world.entity("Grandchild"));
25-
grandchild.set(new Position(15, 15));
26-
grandchild.childOf(child1);
26+
Entity child1 = world.obtainEntity(world.entity("Child1"));
27+
child1.set(new Position(10, 10));
28+
child1.childOf(scene);
2729

28-
System.out.println("Child1 parent: " + world.obtainEntity(child1.parent()).getName());
29-
System.out.println("Grandchild parent: " + world.obtainEntity(grandchild.parent()).getName());
30+
Entity child2 = world.obtainEntity(world.entity("Child2"));
31+
child2.set(new Position(20, 20));
32+
child2.childOf(scene);
3033

31-
System.out.println("\nRoot children:");
32-
root.children(child -> System.out.println(" - " + world.obtainEntity(child).getName()));
34+
Entity grandchild = world.obtainEntity(world.entity("Grandchild"));
35+
grandchild.set(new Position(15, 15));
36+
grandchild.childOf(child1);
3337

34-
System.out.println("\nChild1 children:");
35-
child1.children(child -> System.out.println(" - " + world.obtainEntity(child).getName()));
38+
System.out.println("Child1 parent: " + world.obtainEntity(child1.parent()).getName());
39+
System.out.println("Grandchild parent: " + world.obtainEntity(grandchild.parent()).getName());
3640

37-
long likesRelation = world.entity("Likes");
38-
long eatsRelation = world.entity("Eats");
41+
System.out.println("Scene children:");
42+
scene.children(c -> System.out.println(" - " + world.obtainEntity(c).getName()));
3943

40-
Entity alice = world.obtainEntity(world.entity("Alice"));
41-
Entity bob = world.obtainEntity(world.entity("Bob"));
42-
Entity apple = world.obtainEntity(world.entity("Apple"));
44+
System.out.println("Child1 children:");
45+
child1.children(c -> System.out.println(" - " + world.obtainEntity(c).getName()));
46+
}
4347

44-
alice.addRelation(likesRelation, bob.id());
45-
alice.addRelation(eatsRelation, apple.id());
46-
bob.addRelation(likesRelation, alice.id());
48+
private static void parentHierarchy(World world) {
49+
System.out.println("\n=== Parent Hierarchy ===");
4750

48-
System.out.println("\nAlice likes Bob: " + alice.hasRelation(likesRelation, bob.id()));
49-
System.out.println("Alice eats Apple: " + alice.hasRelation(eatsRelation, apple.id()));
50-
System.out.println("Bob likes Alice: " + bob.hasRelation(likesRelation, alice.id()));
51+
Entity spaceship = world.obtainEntity(world.entity("Spaceship"));
52+
spaceship.set(new Position(100, 200));
5153

52-
long vehicleId = world.entity("Vehicle");
53-
long carId = world.entity("Car");
54+
Entity cockpit = world.obtainEntity(world.entity(spaceship.id(), "Cockpit"));
55+
cockpit.set(new Position(105, 210));
5456

55-
Entity myCar = world.obtainEntity(world.entity("MyCar"));
56-
myCar.isA(carId);
57+
Entity engine = world.obtainEntity(world.entity(spaceship.id(), "Engine"));
58+
engine.set(new Position(95, 190));
5759

58-
Entity car = world.obtainEntity(carId);
59-
car.isA(vehicleId);
60+
Entity fuelTank = world.obtainEntity(world.entity(engine.id(), "FuelTank"));
61+
fuelTank.set(new Position(93, 188));
6062

61-
System.out.println("\nMyCar is a Car: " + myCar.hasRelation(world.lookup("IsA"), carId));
63+
System.out.println("Cockpit parent: " + world.obtainEntity(cockpit.parent()).getName());
64+
System.out.println("FuelTank parent: " + world.obtainEntity(fuelTank.parent()).getName());
6265

63-
alice.removeRelation(likesRelation, bob.id());
64-
System.out.println("\nAlice likes Bob after remove: " + alice.hasRelation(likesRelation, bob.id()));
65-
}
66+
System.out.println("Spaceship children:");
67+
spaceship.children(c -> System.out.println(" - " + world.obtainEntity(c).getName()));
68+
69+
System.out.println("Engine children:");
70+
engine.children(c -> System.out.println(" - " + world.obtainEntity(c).getName()));
6671
}
67-
}
6872

73+
private static void customRelationships(World world) {
74+
System.out.println("\n=== Custom Relationships ===");
75+
76+
long likes = world.entity("Likes");
77+
long eats = world.entity("Eats");
78+
79+
Entity alice = world.obtainEntity(world.entity("Alice"));
80+
Entity bob = world.obtainEntity(world.entity("Bob"));
81+
Entity apple = world.obtainEntity(world.entity("Apple"));
82+
83+
alice.addRelation(likes, bob.id());
84+
alice.addRelation(eats, apple.id());
85+
bob.addRelation(likes, alice.id());
86+
87+
System.out.println("Alice likes Bob: " + alice.hasRelation(likes, bob.id()));
88+
System.out.println("Alice eats Apple: " + alice.hasRelation(eats, apple.id()));
89+
System.out.println("Bob likes Alice: " + bob.hasRelation(likes, alice.id()));
90+
91+
alice.removeRelation(likes, bob.id());
92+
System.out.println("Alice likes Bob after remove: " + alice.hasRelation(likes, bob.id()));
93+
}
94+
95+
private static void isaInheritance(World world) {
96+
System.out.println("\n=== IsA Inheritance ===");
97+
98+
long vehicleId = world.entity("Vehicle");
99+
long carId = world.entity("Car");
100+
101+
Entity car = world.obtainEntity(carId);
102+
car.isA(vehicleId);
103+
104+
Entity myCar = world.obtainEntity(world.entity("MyCar"));
105+
myCar.isA(carId);
106+
107+
long isA = world.lookup("IsA");
108+
System.out.println("MyCar isA Car: " + myCar.hasRelation(isA, carId));
109+
System.out.println("Car isA Vehicle: " + car.hasRelation(isA, vehicleId));
110+
}
111+
}

‎src/main/java/com/github/elebras1/flecs/Entity.java‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -402,7 +402,18 @@ public long lookup(String path) {
402402
}
403403

404404
public void children(EntityCallback callback) {
405-
this.children(FlecsConstants.EcsChildOf, callback);
405+
try (Arena tempArena = Arena.ofConfined()) {
406+
MemorySegment iter = flecs_h.ecs_children(tempArena, this.world.nativeHandle(), this.id);
407+
408+
while (flecs_h.ecs_children_next(iter)) {
409+
int count = ecs_iter_t.count(iter);
410+
MemorySegment entities = ecs_iter_t.entities(iter);
411+
for (int i = 0; i < count; i++) {
412+
long entityId = entities.getAtIndex(ValueLayout.JAVA_LONG, i);
413+
callback.accept(entityId);
414+
}
415+
}
416+
}
406417
}
407418

408419
public void children(long relationId, EntityCallback callback) {

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