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/*
* Copyright 2021 TiKV Project Authors.
*
* Licensed 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.tikv.common.codec;
import java.util.Arrays;
import org.tikv.common.exception.InvalidCodecFormatException;
public class RowV2 {
// CodecVer is the constant number that represent the new row format.
public static int CODEC_VER = 0x80;
// small: colID byte[], offsets int[], optimized for most cases.
// large: colID long[], offsets long[].
boolean large;
int numNotNullCols;
int numNullCols;
byte[] colIDs;
int[] offsets;
byte[] data;
// for large row
int[] colIDs32;
int[] offsets32;
private RowV2(byte[] rowData) {
fromBytes(rowData);
}
public static RowV2 createNew(byte[] rowData) {
return new RowV2(rowData);
}
public static RowV2 createEmpty() {
return new RowV2(false, 0, 0);
}
private RowV2(boolean large, int numNotNullCols, int numNullCols) {
this.large = large;
this.numNotNullCols = numNotNullCols;
this.numNullCols = numNullCols;
}
public byte[] getData(int i) {
int start = 0, end = 0;
if (this.large) {
if (i > 0) {
start = this.offsets32[i - 1];
}
end = this.offsets32[i];
} else {
if (i > 0) {
start = this.offsets[i - 1];
}
end = this.offsets[i];
}
return Arrays.copyOfRange(this.data, start, end);
}
private void fromBytes(byte[] rowData) {
CodecDataInputLittleEndian cdi = new CodecDataInputLittleEndian(rowData);
if (cdi.readUnsignedByte() != CODEC_VER) {
throw new InvalidCodecFormatException("invalid codec version");
}
this.large = (cdi.readUnsignedByte() & 1) > 0;
this.numNotNullCols = cdi.readUnsignedShort();
this.numNullCols = cdi.readUnsignedShort();
int cursor = 6;
if (this.large) {
int numCols = this.numNotNullCols + this.numNullCols;
int colIDsLen = numCols * 4;
this.colIDs32 = new int[numCols];
for (int i = 0; i < numCols; i++) {
this.colIDs32[i] = cdi.readInt();
}
cursor += colIDsLen;
numCols = this.numNotNullCols;
int offsetsLen = numCols * 4;
this.offsets32 = new int[numCols];
for (int i = 0; i < numCols; i++) {
this.offsets32[i] = cdi.readInt();
}
cursor += offsetsLen;
} else {
int numCols = this.numNotNullCols + this.numNullCols;
int colIDsLen = numCols;
this.colIDs = new byte[numCols];
cdi.readFully(this.colIDs, 0, numCols);
cursor += colIDsLen;
numCols = this.numNotNullCols;
int offsetsLen = numCols * 2;
this.offsets = new int[numCols];
for (int i = 0; i < numCols; i++) {
this.offsets[i] = cdi.readUnsignedShort();
}
cursor += offsetsLen;
}
this.data = Arrays.copyOfRange(rowData, cursor, rowData.length);
}
private void writeShortArray(CodecDataOutput cdo, int[] arr) {
for (int value : arr) {
cdo.writeShort(value);
}
}
private void writeIntArray(CodecDataOutput cdo, int[] arr) {
for (int value : arr) {
cdo.writeInt(value);
}
}
public byte[] toBytes() {
CodecDataOutputLittleEndian cdo = new CodecDataOutputLittleEndian();
cdo.write(CODEC_VER);
cdo.write(this.large ? 1 : 0);
cdo.writeShort(this.numNotNullCols);
cdo.writeShort(this.numNullCols);
if (this.large) {
writeIntArray(cdo, this.colIDs32);
writeIntArray(cdo, this.offsets32);
} else {
cdo.write(this.colIDs);
writeShortArray(cdo, this.offsets);
}
cdo.write(this.data);
return cdo.toBytes();
}
private int binarySearch(int i, int j, long colID) {
while (i < j) {
int h = (int) ((i + (long) j) >> 1);
// i <= h < j
long v;
if (this.large) {
v = this.colIDs32[h];
} else {
v = this.colIDs[h] & 0xFF;
}
if (v < colID) {
i = h + 1;
} else if (v > colID) {
j = h;
} else {
return h;
}
}
return -1;
}
public ColIDSearchResult findColID(long colID) {
int i = 0, j = this.numNotNullCols;
ColIDSearchResult result = new ColIDSearchResult(-1, false, false);
result.idx = binarySearch(i, j, colID);
if (result.idx != -1) {
return result;
}
// Search the column in null columns array.
i = this.numNotNullCols;
j = this.numNotNullCols + this.numNullCols;
int id = binarySearch(i, j, colID);
if (id != -1) {
// colID found in null cols.
result.isNull = true;
} else {
result.notFound = true;
}
return result;
}
public void initColIDs() {
int numCols = this.numNotNullCols + this.numNullCols;
this.colIDs = new byte[numCols];
}
public void initColIDs32() {
int numCols = this.numNotNullCols + this.numNullCols;
this.colIDs32 = new int[numCols];
}
public void initOffsets() {
this.offsets = new int[this.numNotNullCols];
}
public void initOffsets32() {
this.offsets32 = new int[this.numNotNullCols];
}
public static class ColIDSearchResult {
int idx;
boolean isNull;
boolean notFound;
private ColIDSearchResult(int idx, boolean isNull, boolean notFound) {
this.idx = idx;
this.isNull = isNull;
this.notFound = notFound;
}
}
}