import org.spongepowered.api.data.DataHolder; //导入方法依赖的package包/类

public static AbstractTagObject getValue(DataHolder dataHolder, Key key, Action error) {

Class clazz = key.getElementToken().getRawType();

if (!dataHolder.supports(key)) {

if (FlagMap.class.isAssignableFrom(clazz)) {

return new MapTag();

}

error.run("This data holder does not support the key '" + key.getId() + "'!");

return new NullTag();

}

if (Boolean.class.isAssignableFrom(clazz)) {

return new BooleanTag(dataHolder.getOrElse((Key>) key, false));

}

else if (CatalogType.class.isAssignableFrom(clazz)) {

return new TextTag(dataHolder.getValue((Key>) key).orElseThrow(() -> new ErrorInducedException("Value not present!")).get().getId());

}

else if (Double.class.isAssignableFrom(clazz)) {

return new NumberTag(dataHolder.getOrElse((Key>) key, 0.0));

}

else if (Enum.class.isAssignableFrom(clazz)) {

return new TextTag(dataHolder.getValue((Key>) key).orElseThrow(() -> new ErrorInducedException("Empty enum value!")).get().name());

}

else if (Integer.class.isAssignableFrom(clazz)) {

return new IntegerTag(dataHolder.getOrElse((Key>) key, 0));

}

else if (Vector3d.class.isAssignableFrom(clazz)) {

return new LocationTag(dataHolder.getOrElse((Key>) key, new Vector3d(0, 0, 0)));

}

else if (Text.class.isAssignableFrom(clazz)) {

return new FormattedTextTag(dataHolder.getOrElse((Key>) key, Text.EMPTY));

}

else if (FlagMap.class.isAssignableFrom(clazz)) {

return new MapTag(dataHolder.getOrElse((Key>) key, new FlagMap(new MapTag())).flags.getInternal());

}

else {

error.run("The value type '" + clazz.getName() + "' is not supported yet!");

return new NullTag();

}

}