Package com.zaxxer.sparsebits
Class SparseBitSet.UpdateStrategy
java.lang.Object
com.zaxxer.sparsebits.SparseBitSet.AbstractStrategy
com.zaxxer.sparsebits.SparseBitSet.UpdateStrategy
- Enclosing class:
SparseBitSet
Update the seven statistics that are computed for each set. These are
updated by calling statisticsUpdate, which uses this strategy.
update| 0 1 0| 0 0 1| 1 1
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected int
Working space for counting the number of non-zero bits in the bit set.protected int
Working space for keeping count of the number of non-zero words in the bit set.protected long
Working space for find the hash value of the bit set.protected int
Working space for find the size and length of the bit set.protected int
Working space for find the size and length of the bit set.protected long
Working space for find the size and length of the bit set.protected long
Working space for find the size and length of the bit set.Fields inherited from class com.zaxxer.sparsebits.SparseBitSet.AbstractStrategy
F_OP_F_EQ_F, F_OP_X_EQ_F, X_OP_F_EQ_F, X_OP_F_EQ_X
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected boolean
block
(int base, int u3, int v3, long[] a3, long[] b3) Deals with a part of a block that consists of whole words, starting with the given first index, and ending with the word before the last index.private void
compute
(int index, long word) This method does the accumulation of the statistics.protected void
finish
(int a2Count, int a3Count) This is called to finish the processing started by the strategy (if there needs to be anything done at all).protected int
Properties of this strategy.protected boolean
This method initializes the computations by suitably resetting cache fields or working fields.protected boolean
word
(int base, int u3, long[] a3, long[] b3, long mask) Deal with a scan that include a partial word within a level3 block.Methods inherited from class com.zaxxer.sparsebits.SparseBitSet.AbstractStrategy
isZeroBlock
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Field Details
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wMin
protected transient int wMinWorking space for find the size and length of the bit set. Holds the index of the first non-empty word in the set. -
wordMin
protected transient long wordMinWorking space for find the size and length of the bit set. Holds copy of the first non-empty word in the set. -
wMax
protected transient int wMaxWorking space for find the size and length of the bit set. Holds the index of the last non-empty word in the set. -
wordMax
protected transient long wordMaxWorking space for find the size and length of the bit set. Holds a copy of the last non-empty word in the set. -
hash
protected transient long hashWorking space for find the hash value of the bit set. Holds the current state of the computation of the hash value. This value is ultimately transferred to the Cache object.- See Also:
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count
protected transient int countWorking space for keeping count of the number of non-zero words in the bit set. Holds the current state of the computation of the count. This value is ultimately transferred to the Cache object.- See Also:
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cardinality
protected transient int cardinalityWorking space for counting the number of non-zero bits in the bit set. Holds the current state of the computation of the cardinality.This value is ultimately transferred to the Cache object.- See Also:
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Constructor Details
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UpdateStrategy
protected UpdateStrategy()
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Method Details
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properties
protected int properties()Description copied from class:SparseBitSet.AbstractStrategy
Properties of this strategy.- Specified by:
properties
in classSparseBitSet.AbstractStrategy
- Returns:
- the int containing the bits representing the properties of this strategy
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start
This method initializes the computations by suitably resetting cache fields or working fields.- Specified by:
start
in classSparseBitSet.AbstractStrategy
- Parameters:
b
- the other SparseBitSet, for checking if needed.- Returns:
- true -> if the cache should be set to zero
- Since:
- 1.6
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word
protected boolean word(int base, int u3, long[] a3, long[] b3, long mask) Description copied from class:SparseBitSet.AbstractStrategy
Deal with a scan that include a partial word within a level3 block. All that is required is that the result be stored (if needed) into the given a set block at the correct position, and that the operation only affect those bits selected by 1 bits in the mask.- Specified by:
word
in classSparseBitSet.AbstractStrategy
- Parameters:
base
- the base index of the block (to be used if needed)u3
- the index of the word within blocka3
- the level3 block from the a set.b3
- the (nominal) level3 block from the b set (not null).mask
- for the (partial) word- Returns:
- true if the resulting word is zero
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block
protected boolean block(int base, int u3, int v3, long[] a3, long[] b3) Description copied from class:SparseBitSet.AbstractStrategy
Deals with a part of a block that consists of whole words, starting with the given first index, and ending with the word before the last index. For the words processed, the return value should indicate whether all those resulting words were zero, or not.- Specified by:
block
in classSparseBitSet.AbstractStrategy
- Parameters:
base
- the base index of the block (to be used if needed)u3
- the index of the first word within block to processv3
- the index of the last word, which may be within blocka3
- the level3 block from the a set.b3
- the (nominal) level3 block from the b set (not null).- Returns:
- true if the words scanned within the level3 block were all zero
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finish
protected void finish(int a2Count, int a3Count) Description copied from class:SparseBitSet.AbstractStrategy
This is called to finish the processing started by the strategy (if there needs to be anything done at all).- Overrides:
finish
in classSparseBitSet.AbstractStrategy
- Parameters:
a2Count
- possible count of level2 areas in usea3Count
- possible count of level3 blocks in use
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compute
private void compute(int index, long word) This method does the accumulation of the statistics. It must be called in sequential order of the words in the set for which the statistics are being accumulated, and only for non-null values of the second parameter. Two of the values (a2Count and a3Count) are not updated here, but are done in the code near where this method is called.- Parameters:
index
- the word index of the word suppliedword
- the long non-zero word from the set- Since:
- 1.6
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