| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.iotdb.db.utils; |
| |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.qp.constant.SQLConstant; |
| import org.apache.iotdb.tsfile.common.constant.TsFileConstant; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| |
| public class TypeInferenceUtils { |
| |
| private static TSDataType booleanStringInferType = |
| IoTDBDescriptor.getInstance().getConfig().getBooleanStringInferType(); |
| |
| private static TSDataType integerStringInferType = |
| IoTDBDescriptor.getInstance().getConfig().getIntegerStringInferType(); |
| |
| private static TSDataType longStringInferType = |
| IoTDBDescriptor.getInstance().getConfig().getLongStringInferType(); |
| |
| private static TSDataType floatingStringInferType = |
| IoTDBDescriptor.getInstance().getConfig().getFloatingStringInferType(); |
| |
| private static TSDataType nanStringInferType = |
| IoTDBDescriptor.getInstance().getConfig().getNanStringInferType(); |
| |
| private TypeInferenceUtils() {} |
| |
| static boolean isNumber(String s) { |
| if (s == null || s.equals("NaN")) { |
| return false; |
| } |
| try { |
| Double.parseDouble(s); |
| } catch (NumberFormatException e) { |
| return false; |
| } |
| return true; |
| } |
| |
| private static boolean isBoolean(String s) { |
| return s.equalsIgnoreCase(SQLConstant.BOOLEAN_TRUE) |
| || s.equalsIgnoreCase(SQLConstant.BOOLEAN_FALSE); |
| } |
| |
| private static boolean isConvertFloatPrecisionLack(String s) { |
| return Long.parseLong(s) > (2 << 24); |
| } |
| |
| /** Get predicted DataType of the given value */ |
| public static TSDataType getPredictedDataType(Object value, boolean inferType) { |
| |
| if (inferType) { |
| String strValue = value.toString(); |
| if (isBoolean(strValue)) { |
| return booleanStringInferType; |
| } else if (isNumber(strValue)) { |
| if (!strValue.contains(TsFileConstant.PATH_SEPARATOR)) { |
| if (isConvertFloatPrecisionLack(strValue)) { |
| return longStringInferType; |
| } |
| return integerStringInferType; |
| } else { |
| return floatingStringInferType; |
| } |
| // "NaN" is returned if the NaN Literal is given in Parser |
| } else if ("NaN".equals(strValue)) { |
| return nanStringInferType; |
| } else { |
| return TSDataType.TEXT; |
| } |
| } else if (value instanceof Boolean) { |
| return TSDataType.BOOLEAN; |
| } else if (value instanceof Integer) { |
| return TSDataType.INT32; |
| } else if (value instanceof Long) { |
| return TSDataType.INT64; |
| } else if (value instanceof Float) { |
| return TSDataType.FLOAT; |
| } else if (value instanceof Double) { |
| return TSDataType.DOUBLE; |
| } |
| |
| return TSDataType.TEXT; |
| } |
| } |