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package gregtech.api.multitileentity;
import java.lang.ref.WeakReference;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.ChunkCoordinates;
import net.minecraft.world.World;
import gregtech.api.multitileentity.interfaces.IMultiTileEntity;
public class WeakTargetRef<T extends IMultiTileEntity> {
protected final ChunkCoordinates position = new ChunkCoordinates(0, -1, 0);
protected final Class<?> targetClass;
protected boolean shouldCache;
protected WeakReference<T> target = new WeakReference<>(null);
protected World world = null;
public WeakTargetRef(Class<?> targetClass, boolean shouldCache) {
this.targetClass = targetClass;
this.shouldCache = shouldCache;
}
public WeakTargetRef(T target, boolean shouldCache) {
this(target.getClass(), shouldCache);
setTarget(target);
}
public void setTarget(T newTarget) {
if (!targetClass.isInstance(newTarget)) {
throw new IllegalArgumentException("Target is not of the correct type");
}
position.set(newTarget.getXCoord(), newTarget.getYCoord(), newTarget.getZCoord());
world = newTarget.getWorld();
}
public void setWorld(World world) {
this.world = world;
}
public void setPosition(ChunkCoordinates position) {
this.position.set(position.posX, position.posY, position.posZ);
}
public void setPosition(int x, int y, int z) {
this.position.set(x, y, z);
}
public void setShouldCache(boolean shouldCache) {
this.shouldCache = shouldCache;
}
public T get() {
if (!shouldCache) {
return resolveTarget();
}
T result = target.get();
if (result == null || result.isDead()) {
result = resolveTarget();
if (result != null) {
target = new WeakReference<>(result);
} else {
target.clear();
}
}
return result;
}
@SuppressWarnings("unchecked")
protected T resolveTarget() {
if (world != null && position.posX >= 0 && world.blockExists(position.posX, position.posY, position.posZ)) {
final TileEntity te = world.getTileEntity(position.posX, position.posY, position.posZ);
return this.targetClass.isInstance(te) ? (T) te : null;
}
return null;
}
public ChunkCoordinates getPosition() {
return position;
}
public void invalidate() {
target.clear();
world = null;
position.set(0, -1, 0);
}
}
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