| /* |
| * 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.queryengine.common.header; |
| |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| |
| public class ColumnHeader { |
| |
| private final String columnName; |
| private final TSDataType dataType; |
| private final String alias; |
| |
| public ColumnHeader(String columnName, TSDataType dataType, String alias) { |
| this.columnName = columnName; |
| this.dataType = dataType; |
| this.alias = alias; |
| } |
| |
| public ColumnHeader(String columnName, TSDataType dataType) { |
| this.columnName = columnName; |
| this.dataType = dataType; |
| this.alias = null; |
| } |
| |
| public String getColumnNameWithAlias() { |
| if (alias != null) { |
| return alias; |
| } |
| return columnName; |
| } |
| |
| public String getColumnName() { |
| return columnName; |
| } |
| |
| public TSDataType getColumnType() { |
| return dataType; |
| } |
| |
| public boolean hasAlias() { |
| return alias != null && !alias.isEmpty(); |
| } |
| |
| public void serialize(ByteBuffer byteBuffer) { |
| ReadWriteIOUtils.write(columnName, byteBuffer); |
| ReadWriteIOUtils.write(dataType.ordinal(), byteBuffer); |
| ReadWriteIOUtils.write(hasAlias(), byteBuffer); |
| if (hasAlias()) { |
| ReadWriteIOUtils.write(alias, byteBuffer); |
| } |
| dataType.serializeTo(byteBuffer); |
| } |
| |
| public static ColumnHeader deserialize(ByteBuffer byteBuffer) { |
| String columnName = ReadWriteIOUtils.readString(byteBuffer); |
| TSDataType dataType = TSDataType.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| String alias = null; |
| boolean hasAlias = ReadWriteIOUtils.readBool(byteBuffer); |
| if (hasAlias) { |
| alias = ReadWriteIOUtils.readString(byteBuffer); |
| } |
| return new ColumnHeader(columnName, dataType, alias); |
| } |
| |
| @Override |
| public String toString() { |
| if (hasAlias()) { |
| return String.format("%s(%s) [%s]", columnName, alias, dataType); |
| } |
| return String.format("%s [%s]", columnName, dataType); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| ColumnHeader that = (ColumnHeader) o; |
| return Objects.equals(columnName, that.columnName) |
| && dataType == that.dataType |
| && Objects.equals(alias, that.alias); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(columnName, dataType, alias); |
| } |
| } |