PackedBitStorage.java

net.minecraft.util.datafix.PackedBitStorage

信息

• 全限定名：net.minecraft.util.datafix.PackedBitStorage
• 类型：public class
• 包：net.minecraft.util.datafix
• 源码路径：src/main/java/net/minecraft/util/datafix/PackedBitStorage.java
• 起始行号：L6
• 职责：

  TODO

字段/常量

• BIT_TO_LONG_SHIFT

  • 类型: int
  • 修饰符: private static final
  • 源码定位: L7
  • 说明:

    TODO

• data

  • 类型: long[]
  • 修饰符: private final
  • 源码定位: L8
  • 说明:

    TODO

• bits

  • 类型: int
  • 修饰符: private final
  • 源码定位: L9
  • 说明:

    TODO

• mask

  • 类型: long
  • 修饰符: private final
  • 源码定位: L10
  • 说明:

    TODO

• size

  • 类型: int
  • 修饰符: private final
  • 源码定位: L11
  • 说明:

    TODO

内部类/嵌套类型

• 无

构造器

public PackedBitStorage(int bits, int size) @ L13

• 构造器名：PackedBitStorage
• 源码定位：L13
• 修饰符：public

参数:

• bits: int
• size: int

说明:

TODO

public PackedBitStorage(int bits, int size, long[] data) @ L17

• 构造器名：PackedBitStorage
• 源码定位：L17
• 修饰符：public

参数:

• bits: int
• size: int
• data: long[]

说明:

TODO

方法

下面的方法块按源码顺序生成。

public void set(int index, int value) @ L29

• 方法名：set
• 源码定位：L29
• 返回类型：void
• 修饰符：public

参数:

• index: int
• value: int

说明:

TODO

public int get(int index) @ L44

• 方法名：get
• 源码定位：L44
• 返回类型：int
• 修饰符：public

参数:

• index: int

说明:

TODO

public long[] getRaw() @ L58

• 方法名：getRaw
• 源码定位：L58
• 返回类型：long[]
• 修饰符：public

参数:

• 无

说明:

TODO

public int getBits() @ L62

• 方法名：getBits
• 源码定位：L62
• 返回类型：int
• 修饰符：public

参数:

• 无

说明:

TODO

代码

public class PackedBitStorage {
    private static final int BIT_TO_LONG_SHIFT = 6;
    private final long[] data;
    private final int bits;
    private final long mask;
    private final int size;
 
    public PackedBitStorage(int bits, int size) {
        this(bits, size, new long[Mth.roundToward(size * bits, 64) / 64]);
    }
 
    public PackedBitStorage(int bits, int size, long[] data) {
        Validate.inclusiveBetween(1L, 32L, (long)bits);
        this.size = size;
        this.bits = bits;
        this.data = data;
        this.mask = (1L << bits) - 1L;
        int requiredLength = Mth.roundToward(size * bits, 64) / 64;
        if (data.length != requiredLength) {
            throw new IllegalArgumentException("Invalid length given for storage, got: " + data.length + " but expected: " + requiredLength);
        }
    }
 
    public void set(int index, int value) {
        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
        Validate.inclusiveBetween(0L, this.mask, (long)value);
        int position = index * this.bits;
        int startData = position >> 6;
        int endData = (index + 1) * this.bits - 1 >> 6;
        int startBit = position ^ startData << 6;
        this.data[startData] = this.data[startData] & ~(this.mask << startBit) | (value & this.mask) << startBit;
        if (startData != endData) {
            int shiftBits = 64 - startBit;
            int wantedBits = this.bits - shiftBits;
            this.data[endData] = this.data[endData] >>> wantedBits << wantedBits | (value & this.mask) >> shiftBits;
        }
    }
 
    public int get(int index) {
        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
        int position = index * this.bits;
        int startData = position >> 6;
        int endData = (index + 1) * this.bits - 1 >> 6;
        int startBit = position ^ startData << 6;
        if (startData == endData) {
            return (int)(this.data[startData] >>> startBit & this.mask);
        } else {
            int shiftBits = 64 - startBit;
            return (int)((this.data[startData] >>> startBit | this.data[endData] << shiftBits) & this.mask);
        }
    }
 
    public long[] getRaw() {
        return this.data;
    }
 
    public int getBits() {
        return this.bits;
    }
}

引用的其他类

• Mth
  • 引用位置: 方法调用
  • 关联成员: Mth.roundToward()