org.dinky.shaded.paimon.data.BinarySection 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.dinky.shaded.paimon.data;
import org.dinky.shaded.paimon.memory.MemorySegment;
import org.dinky.shaded.paimon.memory.MemorySegmentUtils;
import org.dinky.shaded.paimon.utils.IOUtils;
import org.dinky.shaded.paimon.utils.Preconditions;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/** Describe a section of memory. */
public abstract class BinarySection implements Serializable {
private static final long serialVersionUID = 1L;
/**
* It decides whether to put data in FixLenPart or VarLenPart. See more in {@link BinaryRow}.
*
* If len is less than 8, its binary format is: 1-bit mark(1) = 1, 7-bits len, and 7-bytes
* data. Data is stored in fix-length part.
*
*
If len is greater or equal to 8, its binary format is: 1-bit mark(1) = 0, 31-bits offset
* to the data, and 4-bytes length of data. Data is stored in variable-length part.
*/
public static final int MAX_FIX_PART_DATA_SIZE = 7;
/**
* To get the mark in highest bit of long. Form: 10000000 00000000 ... (8 bytes)
*
*
This is used to decide whether the data is stored in fixed-length part or variable-length
* part. see {@link #MAX_FIX_PART_DATA_SIZE} for more information.
*/
public static final long HIGHEST_FIRST_BIT = 0x80L << 56;
/**
* To get the 7 bits length in second bit to eighth bit out of a long. Form: 01111111 00000000
* ... (8 bytes)
*
*
This is used to get the length of the data which is stored in this long. see {@link
* #MAX_FIX_PART_DATA_SIZE} for more information.
*/
public static final long HIGHEST_SECOND_TO_EIGHTH_BIT = 0x7FL << 56;
protected transient MemorySegment[] segments;
protected transient int offset;
protected transient int sizeInBytes;
public BinarySection() {}
public BinarySection(MemorySegment[] segments, int offset, int sizeInBytes) {
Preconditions.checkArgument(segments != null);
this.segments = segments;
this.offset = offset;
this.sizeInBytes = sizeInBytes;
}
public final void pointTo(MemorySegment segment, int offset, int sizeInBytes) {
pointTo(new MemorySegment[] {segment}, offset, sizeInBytes);
}
public void pointTo(MemorySegment[] segments, int offset, int sizeInBytes) {
Preconditions.checkArgument(segments != null);
this.segments = segments;
this.offset = offset;
this.sizeInBytes = sizeInBytes;
}
public MemorySegment[] getSegments() {
return segments;
}
public int getOffset() {
return offset;
}
public int getSizeInBytes() {
return sizeInBytes;
}
public byte[] toBytes() {
return MemorySegmentUtils.getBytes(segments, offset, sizeInBytes);
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
byte[] bytes = toBytes();
out.writeInt(bytes.length);
out.write(bytes);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
byte[] bytes = new byte[in.readInt()];
IOUtils.readFully(in, bytes);
pointTo(MemorySegment.wrap(bytes), 0, bytes.length);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final BinarySection that = (BinarySection) o;
return sizeInBytes == that.sizeInBytes
&& MemorySegmentUtils.equals(
segments, offset, that.segments, that.offset, sizeInBytes);
}
@Override
public int hashCode() {
return MemorySegmentUtils.hash(segments, offset, sizeInBytes);
}
}