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Apache Lucene (module: backward-codecs)
// This file has been automatically generated, DO NOT EDIT
/*
* 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.lucene.backward_codecs.packed;
import java.io.IOException;
import java.util.Arrays;
import org.apache.lucene.store.DataInput;
import org.apache.lucene.util.RamUsageEstimator;
import org.apache.lucene.util.packed.PackedInts;
/**
* This class is similar to {@link LegacyPacked64} except that it trades space for speed by ensuring
* that a single block needs to be read/written in order to read/write a value.
*/
abstract class LegacyPacked64SingleBlock extends PackedInts.Reader {
public static final int MAX_SUPPORTED_BITS_PER_VALUE = 32;
private static final int[] SUPPORTED_BITS_PER_VALUE =
new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 16, 21, 32};
public static boolean isSupported(int bitsPerValue) {
return Arrays.binarySearch(SUPPORTED_BITS_PER_VALUE, bitsPerValue) >= 0;
}
private static int requiredCapacity(int valueCount, int valuesPerBlock) {
return valueCount / valuesPerBlock + (valueCount % valuesPerBlock == 0 ? 0 : 1);
}
final long[] blocks;
protected final int valueCount;
protected final int bitsPerValue;
LegacyPacked64SingleBlock(int valueCount, int bitsPerValue) {
this.valueCount = valueCount;
this.bitsPerValue = bitsPerValue;
assert isSupported(bitsPerValue);
final int valuesPerBlock = 64 / bitsPerValue;
blocks = new long[requiredCapacity(valueCount, valuesPerBlock)];
}
@Override
public final int size() {
return valueCount;
}
@Override
public long ramBytesUsed() {
return RamUsageEstimator.alignObjectSize(
RamUsageEstimator.NUM_BYTES_OBJECT_HEADER
+ 2 * Integer.BYTES // valueCount,bitsPerValue
+ RamUsageEstimator.NUM_BYTES_OBJECT_REF) // blocks ref
+ RamUsageEstimator.sizeOf(blocks);
}
@Override
public int get(int index, long[] arr, int off, int len) {
assert len > 0 : "len must be > 0 (got " + len + ")";
assert index >= 0 && index < valueCount;
len = Math.min(len, valueCount - index);
assert off + len <= arr.length;
final int originalIndex = index;
// go to the next block boundary
final int valuesPerBlock = 64 / bitsPerValue;
final int offsetInBlock = index % valuesPerBlock;
if (offsetInBlock != 0) {
for (int i = offsetInBlock; i < valuesPerBlock && len > 0; ++i) {
arr[off++] = get(index++);
--len;
}
if (len == 0) {
return index - originalIndex;
}
}
// bulk get
assert index % valuesPerBlock == 0;
@SuppressWarnings("deprecation")
final PackedInts.Decoder decoder =
PackedInts.getDecoder(
PackedInts.Format.PACKED_SINGLE_BLOCK, PackedInts.VERSION_CURRENT, bitsPerValue);
assert decoder.longBlockCount() == 1;
assert decoder.longValueCount() == valuesPerBlock;
final int blockIndex = index / valuesPerBlock;
final int nblocks = (index + len) / valuesPerBlock - blockIndex;
decoder.decode(blocks, blockIndex, arr, off, nblocks);
final int diff = nblocks * valuesPerBlock;
index += diff;
len -= diff;
if (index > originalIndex) {
// stay at the block boundary
return index - originalIndex;
} else {
// no progress so far => already at a block boundary but no full block to
// get
assert index == originalIndex;
return super.get(index, arr, off, len);
}
}
@Override
public String toString() {
return getClass().getSimpleName()
+ "(bitsPerValue="
+ bitsPerValue
+ ",size="
+ size()
+ ",blocks="
+ blocks.length
+ ")";
}
public static LegacyPacked64SingleBlock create(DataInput in, int valueCount, int bitsPerValue)
throws IOException {
LegacyPacked64SingleBlock reader = create(valueCount, bitsPerValue);
for (int i = 0; i < reader.blocks.length; ++i) {
reader.blocks[i] = in.readLong();
}
return reader;
}
private static LegacyPacked64SingleBlock create(int valueCount, int bitsPerValue) {
switch (bitsPerValue) {
case 1:
return new Packed64SingleBlock1(valueCount);
case 2:
return new Packed64SingleBlock2(valueCount);
case 3:
return new Packed64SingleBlock3(valueCount);
case 4:
return new Packed64SingleBlock4(valueCount);
case 5:
return new Packed64SingleBlock5(valueCount);
case 6:
return new Packed64SingleBlock6(valueCount);
case 7:
return new Packed64SingleBlock7(valueCount);
case 8:
return new Packed64SingleBlock8(valueCount);
case 9:
return new Packed64SingleBlock9(valueCount);
case 10:
return new Packed64SingleBlock10(valueCount);
case 12:
return new Packed64SingleBlock12(valueCount);
case 16:
return new Packed64SingleBlock16(valueCount);
case 21:
return new Packed64SingleBlock21(valueCount);
case 32:
return new Packed64SingleBlock32(valueCount);
default:
throw new IllegalArgumentException("Unsupported number of bits per value: " + 32);
}
}
static class Packed64SingleBlock1 extends LegacyPacked64SingleBlock {
Packed64SingleBlock1(int valueCount) {
super(valueCount, 1);
}
@Override
public long get(int index) {
final int o = index >>> 6;
final int b = index & 63;
final int shift = b << 0;
return (blocks[o] >>> shift) & 1L;
}
}
static class Packed64SingleBlock2 extends LegacyPacked64SingleBlock {
Packed64SingleBlock2(int valueCount) {
super(valueCount, 2);
}
@Override
public long get(int index) {
final int o = index >>> 5;
final int b = index & 31;
final int shift = b << 1;
return (blocks[o] >>> shift) & 3L;
}
}
static class Packed64SingleBlock3 extends LegacyPacked64SingleBlock {
Packed64SingleBlock3(int valueCount) {
super(valueCount, 3);
}
@Override
public long get(int index) {
final int o = index / 21;
final int b = index % 21;
final int shift = b * 3;
return (blocks[o] >>> shift) & 7L;
}
}
static class Packed64SingleBlock4 extends LegacyPacked64SingleBlock {
Packed64SingleBlock4(int valueCount) {
super(valueCount, 4);
}
@Override
public long get(int index) {
final int o = index >>> 4;
final int b = index & 15;
final int shift = b << 2;
return (blocks[o] >>> shift) & 15L;
}
}
static class Packed64SingleBlock5 extends LegacyPacked64SingleBlock {
Packed64SingleBlock5(int valueCount) {
super(valueCount, 5);
}
@Override
public long get(int index) {
final int o = index / 12;
final int b = index % 12;
final int shift = b * 5;
return (blocks[o] >>> shift) & 31L;
}
}
static class Packed64SingleBlock6 extends LegacyPacked64SingleBlock {
Packed64SingleBlock6(int valueCount) {
super(valueCount, 6);
}
@Override
public long get(int index) {
final int o = index / 10;
final int b = index % 10;
final int shift = b * 6;
return (blocks[o] >>> shift) & 63L;
}
}
static class Packed64SingleBlock7 extends LegacyPacked64SingleBlock {
Packed64SingleBlock7(int valueCount) {
super(valueCount, 7);
}
@Override
public long get(int index) {
final int o = index / 9;
final int b = index % 9;
final int shift = b * 7;
return (blocks[o] >>> shift) & 127L;
}
}
static class Packed64SingleBlock8 extends LegacyPacked64SingleBlock {
Packed64SingleBlock8(int valueCount) {
super(valueCount, 8);
}
@Override
public long get(int index) {
final int o = index >>> 3;
final int b = index & 7;
final int shift = b << 3;
return (blocks[o] >>> shift) & 255L;
}
}
static class Packed64SingleBlock9 extends LegacyPacked64SingleBlock {
Packed64SingleBlock9(int valueCount) {
super(valueCount, 9);
}
@Override
public long get(int index) {
final int o = index / 7;
final int b = index % 7;
final int shift = b * 9;
return (blocks[o] >>> shift) & 511L;
}
}
static class Packed64SingleBlock10 extends LegacyPacked64SingleBlock {
Packed64SingleBlock10(int valueCount) {
super(valueCount, 10);
}
@Override
public long get(int index) {
final int o = index / 6;
final int b = index % 6;
final int shift = b * 10;
return (blocks[o] >>> shift) & 1023L;
}
}
static class Packed64SingleBlock12 extends LegacyPacked64SingleBlock {
Packed64SingleBlock12(int valueCount) {
super(valueCount, 12);
}
@Override
public long get(int index) {
final int o = index / 5;
final int b = index % 5;
final int shift = b * 12;
return (blocks[o] >>> shift) & 4095L;
}
}
static class Packed64SingleBlock16 extends LegacyPacked64SingleBlock {
Packed64SingleBlock16(int valueCount) {
super(valueCount, 16);
}
@Override
public long get(int index) {
final int o = index >>> 2;
final int b = index & 3;
final int shift = b << 4;
return (blocks[o] >>> shift) & 65535L;
}
}
static class Packed64SingleBlock21 extends LegacyPacked64SingleBlock {
Packed64SingleBlock21(int valueCount) {
super(valueCount, 21);
}
@Override
public long get(int index) {
final int o = index / 3;
final int b = index % 3;
final int shift = b * 21;
return (blocks[o] >>> shift) & 2097151L;
}
}
static class Packed64SingleBlock32 extends LegacyPacked64SingleBlock {
Packed64SingleBlock32(int valueCount) {
super(valueCount, 32);
}
@Override
public long get(int index) {
final int o = index >>> 1;
final int b = index & 1;
final int shift = b << 5;
return (blocks[o] >>> shift) & 4294967295L;
}
}
}
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