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

public void safeOffer(DataHolder target, DataManipulator data) {
    DataTransactionResult result = target.offer(data);
    if (result.getType() != DataTransactionResult.Type.SUCCESS) {
        target.undo(result);
    }
}