protected <T extends Tag> T getChildTag(Map<String, Tag> items, String key, Class<T> expected) {
if (!items.containsKey(key)) {
return null;
}
Tag tag = items.get(key);
if (!expected.isInstance(tag)) {
throw new IllegalArgumentException(
tag.getName()
+ " tag is not of tag type "
+ expected.getName()
+ System.lineSeparator()
+ "tag is: "
+ tag);
}
return expected.cast(tag);
}
protected <T> T convert(Object obj, Class<T> expected) {
if (!(obj instanceof Tag)) {
return null;
} else {
Tag tag = (Tag) obj;
if (!expected.isInstance(tag.getValue())) {
throw new IllegalArgumentException(
tag.getName()
+ " tag is not of tag type "
+ expected.getName()
+ System.lineSeparator()
+ "tag is: "
+ tag);
}
return expected.cast(tag.getValue());
}
}