/**
* Combines this bloom filter with another bloom filter by performing a bitwise OR of the
* underlying data. The mutations happen to <b>this</b> instance. Callers must ensure the bloom
* filters are appropriately sized to avoid saturating them.
*
* @param that The bloom filter to combine this bloom filter with. It is not mutated.
* @throws IllegalArgumentException if {@code isCompatible(that) == false}
* @since 15.0
*/
public void putAll(BloomFilter<T> that) {
checkNotNull(that);
checkArgument(this != that, "Cannot combine a BloomFilter with itself.");
checkArgument(
this.numHashFunctions == that.numHashFunctions,
"BloomFilters must have the same number of hash functions (%s != %s)",
this.numHashFunctions,
that.numHashFunctions);
checkArgument(
this.bitSize() == that.bitSize(),
"BloomFilters must have the same size underlying bit arrays (%s != %s)",
this.bitSize(),
that.bitSize());
checkArgument(
this.strategy.equals(that.strategy),
"BloomFilters must have equal strategies (%s != %s)",
this.strategy,
that.strategy);
checkArgument(
this.funnel.equals(that.funnel),
"BloomFilters must have equal funnels (%s != %s)",
this.funnel,
that.funnel);
this.bits.putAll(that.bits);
}
/**
* Determines whether a given bloom filter is compatible with this bloom filter. For two bloom
* filters to be compatible, they must:
*
* <ul>
* <li>not be the same instance
* <li>have the same number of hash functions
* <li>have the same bit size
* <li>have the same strategy
* <li>have equal funnels
* <ul>
*
* @param that The bloom filter to check for compatibility.
* @since 15.0
*/
public boolean isCompatible(BloomFilter<T> that) {
checkNotNull(that);
return (this != that)
&& (this.numHashFunctions == that.numHashFunctions)
&& (this.bitSize() == that.bitSize())
&& (this.strategy.equals(that.strategy))
&& (this.funnel.equals(that.funnel));
}