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ExperienceOrb merging/stacking API and fixes

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Adds an option for maximum exp value when merging orbs

Adds ExperienceOrbMergeEvent
Fired when the server is about to merge 2 experience orbs
as entities. Plugins can cancel it if they want to ensure experience orbs do not lose important
metadata such as spawn reason, or conditionally move data from source to target.

Fixes an issue where the stacked count was not taking into account
for mending repairs and when merging with spigot's merge-on-spawn
logic

== AT ==
public net.minecraft.world.entity.ExperienceOrb count

Co-authored-by: Aikar <aikar@aikar.co>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
This commit is contained in:
BillyGalbreath
2017-11-10 23:03:12 -05:00
parent e5e4cc7020
commit e91df097e9
3 changed files with 48 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
View File

@@ -18,6 +18,18 @@ public class CraftExperienceOrb extends CraftEntity implements ExperienceOrb {
this.getHandle().value = value;
}
// Paper start - expose count
@Override
public int getCount() {
return this.getHandle().count;
}
@Override
public void setCount(final int count) {
this.getHandle().count = count;
}
// Paper end
// Paper start
public java.util.UUID getTriggerEntityId() {
return getHandle().triggerEntityId;

16
paper-server/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
View File

@@ -712,15 +712,29 @@ public class CraftEventFactory {
if (entity instanceof net.minecraft.world.entity.ExperienceOrb xp) {
double radius = world.spigotConfig.expMerge;
if (radius > 0) {
// Paper start - Maximum exp value when merging; Whole section has been tweaked, see comments for specifics
final long maxValue = world.paperConfig().entities.behavior.experienceMergeMaxValue;
final boolean mergeUnconditionally = maxValue <= 0;
if (mergeUnconditionally || xp.value < maxValue) { // Paper - Skip iteration if unnecessary
List<Entity> entities = world.getEntities(entity, entity.getBoundingBox().inflate(radius, radius, radius));
for (Entity e : entities) {
if (e instanceof net.minecraft.world.entity.ExperienceOrb loopItem) {
if (!loopItem.isRemoved()) {
// Paper start
if (!loopItem.isRemoved() && xp.count == loopItem.count && (mergeUnconditionally || loopItem.value < maxValue) && new com.destroystokyo.paper.event.entity.ExperienceOrbMergeEvent((org.bukkit.entity.ExperienceOrb) entity.getBukkitEntity(), (org.bukkit.entity.ExperienceOrb) loopItem.getBukkitEntity()).callEvent()) { // Paper - ExperienceOrbMergeEvent
long newTotal = (long)xp.value + (long)loopItem.value;
if ((int) newTotal < 0) continue; // Overflow
if (!mergeUnconditionally && newTotal > maxValue) {
loopItem.value = (int) (newTotal - maxValue);
xp.value = (int) maxValue;
} else {
xp.value += loopItem.value;
loopItem.discard(null); // Add Bukkit remove cause
} // Paper end - Maximum exp value when merging
}
}
}
} // Paper end - End iteration skip check - All tweaking ends here
}
}
// Spigot end