@Override
	public DataType getDataType() {
		lock.acquire();
		try {
			checkIsValid();
			long dataTypeID = record.getLongValue(TypedefDBAdapter.TYPEDEF_DT_ID_COL);
			DataType dt = dataMgr.getDataType(dataTypeID);
			if (dt == null) {
				dt = DataType.DEFAULT;
			}
			return dt;
		}
		finally {
			lock.release();
		}
	}
Construct TypeDefDB instance
@param dataMgr datatype manager
@param cache DataTypeDB cache
@param adapter TypeDef record adapter
@param record TypeDefDB record
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/TypedefDB.java