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SimpleGoalController.java
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SimpleGoalController.java
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package net.citizensnpcs.api.ai;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import net.citizensnpcs.api.CitizensAPI;
import net.citizensnpcs.api.ai.tree.Behavior;
import net.citizensnpcs.api.ai.tree.BehaviorGoalAdapter;
import net.citizensnpcs.api.ai.tree.ForwardingBehaviorGoalAdapter;
import org.bukkit.Bukkit;
import org.bukkit.event.HandlerList;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
public class SimpleGoalController implements GoalController {
private final List<Goal> executingGoals = Lists.newArrayList();
private int executingPriority = -1;
private Goal executingRootGoal;
private boolean hasPrioritisableGoal;
private volatile boolean paused;
private final List<GoalEntry> possibleGoals = Lists.newArrayList();
private final GoalSelector selector = new SimpleGoalSelector();
@Override
public void addBehavior(Behavior behavior, int priority) {
if (behavior instanceof Goal) {
addGoal((Goal) behavior, priority);
return;
}
addGoal(BehaviorGoalAdapter.create(behavior), priority);
}
@Override
public void addGoal(Goal goal, int priority) {
Preconditions.checkNotNull(goal, "goal cannot be null");
Preconditions.checkState(priority > 0 && priority < Integer.MAX_VALUE, "priority must be greater than 0");
SimpleGoalEntry entry = new SimpleGoalEntry(goal, priority);
if (possibleGoals.contains(entry))
return;
possibleGoals.add(entry);
Collections.sort(possibleGoals);
}
private void addGoalToExecution(Goal goal) {
if (CitizensAPI.hasImplementation())
Bukkit.getPluginManager().registerEvents(goal, CitizensAPI.getPlugin());
executingGoals.add(goal);
goal.run(selector);
}
@Override
public void addPrioritisableGoal(final PrioritisableGoal goal) {
Preconditions.checkNotNull(goal, "goal cannot be null");
possibleGoals.add(new GoalEntry() {
@Override
public int compareTo(GoalEntry o) {
int priority = getPriority();
return o.getPriority() > priority ? 1 : o.getPriority() < priority ? -1 : 0;
}
@Override
public Behavior getBehavior() {
return goal instanceof Behavior ? (Behavior) goal
: goal instanceof ForwardingBehaviorGoalAdapter ? ((ForwardingBehaviorGoalAdapter) goal)
.getWrapped() : null;
}
@Override
public Goal getGoal() {
return goal;
}
@Override
public int getPriority() {
return goal.getPriority();
}
});
hasPrioritisableGoal = true;
}
@Override
public void cancelCurrentExecution() {
finishCurrentGoalExecution();
}
@Override
public void clear() {
finishCurrentGoalExecution();
possibleGoals.clear();
}
private void finishCurrentGoalExecution() {
if (executingRootGoal == null)
return;
resetGoalList();
executingPriority = -1;
HandlerList.unregisterAll(executingRootGoal);
executingRootGoal = null;
}
@Override
public boolean isExecutingGoal() {
return executingRootGoal != null;
}
@Override
public boolean isPaused() {
return paused;
}
@Override
public Iterator<GoalEntry> iterator() {
final Iterator<GoalEntry> itr = possibleGoals.iterator();
return new Iterator<GoalEntry>() {
GoalEntry cur;
@Override
public boolean hasNext() {
return itr.hasNext();
}
@Override
public GoalEntry next() {
return (cur = itr.next());
}
@Override
public void remove() {
itr.remove();
if (cur.getGoal() == executingRootGoal)
finishCurrentGoalExecution();
}
};
}
@Override
public void removeBehavior(Behavior behavior) {
for (int i = 0; i < possibleGoals.size(); ++i) {
Goal test = possibleGoals.get(i).getGoal();
if (test.equals(behavior)) {
possibleGoals.remove(i--);
if (test == executingRootGoal)
finishCurrentGoalExecution();
}
}
}
@Override
public void removeGoal(Goal goal) {
Preconditions.checkNotNull(goal, "goal cannot be null");
for (int j = 0; j < possibleGoals.size(); ++j) {
Goal test = possibleGoals.get(j).getGoal();
if (!test.equals(goal))
continue;
possibleGoals.remove(j--);
if (test == executingRootGoal) {
finishCurrentGoalExecution();
}
}
if (goal instanceof PrioritisableGoal) {
boolean foundOther = false;
for (GoalEntry test : possibleGoals) {
if (test.getGoal() instanceof PrioritisableGoal) {
foundOther = true;
break;
}
}
if (!foundOther)
hasPrioritisableGoal = false;
}
}
private void resetGoalList() {
for (int i = 0; i < executingGoals.size(); ++i) {
Goal goal = executingGoals.remove(i--);
goal.reset();
HandlerList.unregisterAll(goal);
}
}
@Override
public void run() {
if (possibleGoals.isEmpty() || paused)
return;
trySelectGoal();
for (int i = 0; i < executingGoals.size(); ++i) {
Goal goal = executingGoals.get(i);
goal.run(selector);
}
}
@Override
public void setPaused(boolean paused) {
this.paused = paused;
}
private void setupExecution(GoalEntry entry) {
finishCurrentGoalExecution();
executingPriority = entry.getPriority();
executingRootGoal = entry.getGoal();
addGoalToExecution(entry.getGoal());
}
private void trySelectGoal() {
int searchPriority = Math.max(executingPriority, 1);
if (hasPrioritisableGoal)
Collections.sort(possibleGoals);
for (int i = possibleGoals.size() - 1; i >= 0; --i) {
GoalEntry entry = possibleGoals.get(i);
if (searchPriority > entry.getPriority())
return;
if (entry.getGoal() == executingRootGoal || !entry.getGoal().shouldExecute(selector)) {
continue;
}
if (i == 0) {
setupExecution(entry);
return;
}
for (int j = i - 1; j >= 0; --j) {
GoalEntry next = possibleGoals.get(j);
boolean unequalPriorities = next.getPriority() != entry.getPriority();
if (unequalPriorities || j == 0) {
if (unequalPriorities)
j++; // we want the previous entry where entry.priority
// == next.priority
int ran = (int) Math.floor(Math.random() * (i - j + 1) + j);
if (ran >= possibleGoals.size() || ran < 0) {
setupExecution(entry);
break;
}
GoalEntry selected = possibleGoals.get(ran);
if (selected.getPriority() != entry.getPriority()) {
setupExecution(entry);
break;
}
setupExecution(selected);
break;
}
}
return;
}
}
public class SimpleGoalSelector implements GoalSelector {
@Override
public void finish() {
finishCurrentGoalExecution();
}
@Override
public void finishAndRemove() {
Goal toRemove = executingRootGoal;
finish();
if (toRemove != null)
removeGoal(toRemove);
}
@Override
public void select(Goal goal) {
resetGoalList();
addGoalToExecution(goal);
}
@Override
public void selectAdditional(Goal... goals) {
for (Goal goal : goals)
addGoalToExecution(goal);
}
}
}