org.bitlap.roaringbitmap.buffer

类 RoaringBatchIterator

java.lang.Object

org.bitlap.roaringbitmap.buffer.RoaringBatchIterator

所有已实现的接口:

java.lang.Cloneable, BatchIterator

public final class RoaringBatchIterator
extends java.lang.Object
implements BatchIterator

构造器概要

构造器

构造器和说明
RoaringBatchIterator(MappeableContainerPointer containerPointer)

方法概要

限定符和类型	方法和说明
void	advanceIfNeeded(int target) If needed, advance as long as the next value is smaller than minval The advanceIfNeeded method is used for performance reasons, to skip over unnecessary repeated calls to next.
BatchIterator	clone() Creates a copy of the iterator.
boolean	hasNext() Returns true is there are more values to get.
int	nextBatch(int[] buffer) Writes the next batch of integers onto the buffer, and returns how many were written.

从类继承的方法 java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.bitlap.roaringbitmap.BatchIterator

asIntIterator

构造器详细资料

RoaringBatchIterator

public RoaringBatchIterator(MappeableContainerPointer containerPointer)

方法详细资料

nextBatch

public int nextBatch(int[] buffer)

从接口复制的说明: BatchIterator

Writes the next batch of integers onto the buffer, and returns how many were written. Aims to fill the buffer.

指定者:

nextBatch 在接口中 BatchIterator

参数:

buffer - - the target to write onto

返回:

how many values were written during the call.

hasNext

public boolean hasNext()

从接口复制的说明: BatchIterator

Returns true is there are more values to get.

指定者:

hasNext 在接口中 BatchIterator

返回:

whether the iterator is exhaused or not.

advanceIfNeeded

public void advanceIfNeeded(int target)

从接口复制的说明: BatchIterator

If needed, advance as long as the next value is smaller than minval The advanceIfNeeded method is used for performance reasons, to skip over unnecessary repeated calls to next. Suppose for example that you wish to compute the intersection between an ordered list of integers (e.g., int[] x = {1,4,5}) and a BatchIterator. You might do it as follows...

     int[] buffer = new int[128];
     BatchIterator j = // get an iterator
     int val = // first value from my other data structure
     j.advanceIfNeeded(val);
     while ( j.hasNext() ) {
       int limit = j.nextBatch(buffer);
       for (int i = 0; i < limit; i++) {
         if (buffer[i] == val) {
           // got it!
           // do something here
           val = // get next value?
         }
       }
       j.advanceIfNeeded(val);
     }
     

The benefit of calling advanceIfNeeded is that each such call can be much faster than repeated calls to "next". The underlying implementation can "skip" over some data.

指定者:

advanceIfNeeded 在接口中 BatchIterator

参数:

target - threshold

clone

public BatchIterator clone()

从接口复制的说明: BatchIterator

Creates a copy of the iterator.

指定者:

clone 在接口中 BatchIterator

覆盖:

clone 在类中 java.lang.Object

返回:

a clone of the current iterator