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Track cause through targets.

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Fixes WORLDGUARD-3314.
This commit is contained in:
sk89q 2015-01-19 18:28:41 -08:00
parent 66a8bfd5b1
commit 451b679323
2 changed files with 82 additions and 64 deletions
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144
src/main/java/com/sk89q/worldguard/bukkit/cause/Cause.java
View File

@ -20,23 +20,17 @@
package com.sk89q.worldguard.bukkit.cause;
import com.google.common.base.Joiner;
import com.google.common.collect.Sets;
import com.sk89q.worldguard.bukkit.internal.WGMetadata;
import org.bukkit.block.Block;
import org.bukkit.entity.Entity;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.entity.Projectile;
import org.bukkit.entity.TNTPrimed;
import org.bukkit.entity.Tameable;
import org.bukkit.entity.Vehicle;
import org.bukkit.entity.*;
import org.bukkit.metadata.Metadatable;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
@ -49,23 +43,36 @@
* is the initiator, while the arrow is merely controlled by the player to
* hit the item frame.</p>
*/
public class Cause {
public final class Cause {
private static final Logger log = Logger.getLogger(Cause.class.getCanonicalName());
private static final String CAUSE_KEY = "worldguard.cause";
private static final Cause UNKNOWN = new Cause(Collections.emptyList());
private static final int MAX_CAUSE_LENGTH = 40;
private static final Cause UNKNOWN = new Cause(Collections.emptyList(), false);
private final List<Object> causes;
private final boolean indirect;
/**
* Create a new instance.
*
* @param causes a list of causes
* @param indirect whether the cause is indirect
*/
private Cause(List<Object> causes) {
private Cause(List<Object> causes, boolean indirect) {
checkNotNull(causes);
this.causes = causes;
this.indirect = indirect;
}
/**
* Test whether the traced cause is indirect.
*
* <p>If the cause is indirect, then the root cause may not be notified,
* for example.</p>
*
* @return true if the cause is indirect
*/
public boolean isIndirect() {
return indirect;
}
/**
@ -159,51 +166,6 @@ public String toString() {
return Joiner.on(" | ").join(causes);
}
/**
* Expand an cause object.
*
* @param list the list to add elements to
* @param element an array of objects
*/
private static void expand(List<Object> list, @Nullable Object ... element) {
if (list.size() >= MAX_CAUSE_LENGTH) {
log.log(Level.WARNING, "While discovering the true cause of an event, the chain of " +
"causes exceeded the limit (" + MAX_CAUSE_LENGTH + "). This could be " +
"caused by a circular cause (arrow's shooter = arrow).", new RuntimeException());
return;
}
if (element != null) {
for (Object o : element) {
if (o == null) {
continue;
}
if (o instanceof TNTPrimed) {
expand(list, ((TNTPrimed) o).getSource());
} else if (o instanceof Projectile) {
expand(list, ((Projectile) o).getShooter());
} else if (o instanceof Vehicle) {
expand(list, ((Vehicle) o).getPassenger());
} else if (o instanceof Tameable) {
expand(list, ((Tameable) o).getOwner());
}
// Add manually tracked parent causes
Object source = o;
int index = list.size();
while (source instanceof Metadatable && !(source instanceof Block)) {
source = WGMetadata.getIfPresent((Metadatable) source, CAUSE_KEY, Object.class);
if (source != null) {
list.add(index, source);
}
}
list.add(o);
}
}
}
/**
* Create a new instance with the given objects as the cause,
* where the first-most object is the initial initiator and those
@ -212,11 +174,11 @@ private static void expand(List<Object> list, @Nullable Object ... element) {
* @param cause an array of causing objects
* @return a cause
*/
public static Cause create(@Nullable Object ... cause) {
public static Cause create(@Nullable Object... cause) {
if (cause != null) {
List<Object> causes = new ArrayList<Object>(cause.length);
expand(causes, cause);
return new Cause(causes);
Builder builder = new Builder(cause.length);
builder.addAll(cause);
return builder.build();
} else {
return UNKNOWN;
}
@ -251,4 +213,60 @@ public static void trackParentCause(Metadatable target, Object parent) {
WGMetadata.put(target, CAUSE_KEY, parent);
}
/**
* Builds causes.
*/
private static final class Builder {
private final List<Object> causes;
private final Set<Object> seen = Sets.newHashSet();
private boolean indirect;
private Builder(int expectedSize) {
this.causes = new ArrayList<Object>(expectedSize);
}
private void addAll(@Nullable Object... element) {
if (element != null) {
for (Object o : element) {
if (o == null || seen.contains(o)) {
continue;
}
seen.add(o);
if (o instanceof TNTPrimed) {
addAll(((TNTPrimed) o).getSource());
} else if (o instanceof Projectile) {
addAll(((Projectile) o).getShooter());
} else if (o instanceof Vehicle) {
addAll(((Vehicle) o).getPassenger());
} else if (o instanceof Creature && ((Creature) o).getTarget() != null) {
indirect = true;
addAll(((Creature) o).getTarget());
} else if (o instanceof Tameable) {
indirect = true;
addAll(((Tameable) o).getOwner());
}
// Add manually tracked parent causes
Object source = o;
int index = causes.size();
while (source instanceof Metadatable && !(source instanceof Block)) {
source = WGMetadata.getIfPresent((Metadatable) source, CAUSE_KEY, Object.class);
if (source != null) {
causes.add(index, source);
seen.add(source);
}
}
causes.add(o);
}
}
}
public Cause build() {
return new Cause(causes, indirect);
}
}
}

2
src/main/java/com/sk89q/worldguard/bukkit/listener/RegionProtectionListener.java
View File

@ -83,7 +83,7 @@ public RegionProtectionListener(WorldGuardPlugin plugin) {
* @param what what was done
*/
private void tellErrorMessage(DelegateEvent event, Cause cause, Location location, String what) {
if (event.isSilent()) {
if (event.isSilent() || cause.isIndirect()) {
return;
}