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import org.spongepowered.api.data.DataHolder;
import org.spongepowered.api.data.DataTransactionResult;
import org.spongepowered.api.data.manipulator.mutable.entity.HealthData;
import org.spongepowered.api.data.value.mutable.MutableBoundedValue;

import java.util.Optional;

public static DataTransactionResult heal(DataHolder target) {
    Optional<HealthData> healthOptional = target.get(HealthData.class);
    if (healthOptional.isPresent()) {
        HealthData healthData = healthOptional.get();

        double maxHealth = healthData.maxHealth().get();
        MutableBoundedValue<Double> currentHealth = healthData.health();
        currentHealth.set(maxHealth);
        healthData.set(currentHealth);

        target.offer(healthData);
    }
}

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Tip

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import org.spongepowered.api.data.manipulator.mutable.DisplayNameData;

public void removeName(DataHolder target) {
    target.remove(DisplayNameData.class);
}

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public void swapHealth(DataHolder targetA, DataHolder targetB) {
    if (targetA.supports(HealthData.class) && targetB.supports(HealthData.class)) {
        HealthData healthA = targetA.getOrCreate(HealthData.class).get();
        HealthData healthB = targetB.getOrCreate(HealthData.class).get();
        targetA.offer(healthB);
        targetB.offer(healthA);
    }
}

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import org.spongepowered.api.data.manipulator.DataManipulator;

public  <T extends DataManipulator<?,?>> void swapData(DataHolder targetA, DataHolder targetB, Class<T> dataClass) {
   if (targetA.supports(dataClass) && targetB.supports(dataClass)) {
       T dataA = targetA.getOrCreate(dataClass).get();
       T dataB = targetB.getOrCreate(dataClass).get();
       targetA.offer(dataB);
       targetB.offer(dataA);
   }
}

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