org.apache.hadoop.hive.serde2.fast.SerializeWrite Maven / Gradle / Ivy
/*
* 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.hadoop.hive.serde2.fast;
import java.io.IOException;
import java.sql.Date;
import java.sql.Timestamp;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hive.common.type.HiveChar;
import org.apache.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.common.type.HiveIntervalDayTime;
import org.apache.hadoop.hive.common.type.HiveIntervalYearMonth;
import org.apache.hadoop.hive.common.type.HiveVarchar;
import org.apache.hadoop.hive.serde2.ByteStream.Output;
/*
* Directly serialize with the caller writing field-by-field a serialization format.
*
* The caller is responsible for calling the write method for the right type of each field
* (or calling writeNull if the field is a NULL).
*
*/
public interface SerializeWrite {
/*
* Set the buffer that will receive the serialized data. The output buffer will be reset.
*/
void set(Output output);
/*
* Set the buffer that will receive the serialized data. The output buffer will NOT be reset.
*/
void setAppend(Output output);
/*
* Reset the previously supplied buffer that will receive the serialized data.
*/
void reset();
/*
* Write a NULL field.
*/
void writeNull() throws IOException;
/*
* BOOLEAN.
*/
void writeBoolean(boolean v) throws IOException;
/*
* BYTE.
*/
void writeByte(byte v) throws IOException;
/*
* SHORT.
*/
void writeShort(short v) throws IOException;
/*
* INT.
*/
void writeInt(int v) throws IOException;
/*
* LONG.
*/
void writeLong(long v) throws IOException;
/*
* FLOAT.
*/
void writeFloat(float vf) throws IOException;
/*
* DOUBLE.
*/
void writeDouble(double vd) throws IOException;
/*
* STRING.
*
* Can be used to write CHAR and VARCHAR when the caller takes responsibility for
* truncation/padding issues.
*/
void writeString(byte[] v) throws IOException;
void writeString(byte[] v, int start, int length) throws IOException;
/*
* CHAR.
*/
void writeHiveChar(HiveChar hiveChar) throws IOException;
/*
* VARCHAR.
*/
void writeHiveVarchar(HiveVarchar hiveVarchar) throws IOException;
/*
* BINARY.
*/
void writeBinary(byte[] v) throws IOException;
void writeBinary(byte[] v, int start, int length) throws IOException;
/*
* DATE.
*/
void writeDate(Date date) throws IOException;
// We provide a faster way to write a date without a Date object.
void writeDate(int dateAsDays) throws IOException;
/*
* TIMESTAMP.
*/
void writeTimestamp(Timestamp vt) throws IOException;
/*
* INTERVAL_YEAR_MONTH.
*/
void writeHiveIntervalYearMonth(HiveIntervalYearMonth viyt) throws IOException;
// We provide a faster way to write a hive interval year month without a HiveIntervalYearMonth object.
void writeHiveIntervalYearMonth(int totalMonths) throws IOException;
/*
* INTERVAL_DAY_TIME.
*/
void writeHiveIntervalDayTime(HiveIntervalDayTime vidt) throws IOException;
/*
* DECIMAL.
*
* NOTE: The scale parameter is for text serialization (e.g. HiveDecimal.toFormatString) that
* creates trailing zeroes output decimals.
*/
void writeDecimal64(long decimal64Long, int scale) throws IOException;
void writeHiveDecimal(HiveDecimal dec, int scale) throws IOException;
void writeHiveDecimal(HiveDecimalWritable decWritable, int scale) throws IOException;
/*
* LIST.
*/
void beginList(List list);
void separateList();
void finishList();
/*
* MAP.
*/
void beginMap(Map map);
void separateKey();
void separateKeyValuePair();
void finishMap();
/*
* STRUCT.
*/
void beginStruct(List fieldValues);
void separateStruct();
void finishStruct();
/*
* UNION.
*/
void beginUnion(int tag) throws IOException;
void finishUnion();
}