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Make BloomFilter support match-all filters better

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This commit is contained in:
Matt Corallo 2013-07-23 18:07:22 +02:00 committed by Mike Hearn
parent 2808b062d7
commit d88d421de6
1 changed files with 25 additions and 5 deletions
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30
core/src/main/java/com/google/bitcoin/core/BloomFilter.java
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@ -232,16 +232,36 @@ public class BloomFilter extends Message {
Utils.setBitLE(data, hash(i, object));
}
/**
* Sets this filter to match all objects
*/
public void setMatchAll() {
data = new byte[] {(byte) 0xff};
}
/**
* Copies filter into this.
* filter must have the same size, hash function count and nTweak or an exception will be thrown.
*/
public void merge(BloomFilter filter) {
Preconditions.checkArgument(filter.data.length == this.data.length &&
filter.hashFuncs == this.hashFuncs &&
filter.nTweak == this.nTweak);
for (int i = 0; i < data.length; i++)
this.data[i] |= filter.data[i];
if (!this.matchesAll() && !filter.matchesAll()) {
Preconditions.checkArgument(filter.data.length == this.data.length &&
filter.hashFuncs == this.hashFuncs &&
filter.nTweak == this.nTweak);
for (int i = 0; i < data.length; i++)
this.data[i] |= filter.data[i];
} else
this.data = new byte[] {(byte) 0xff};
}
/**
* Returns true if this filter will match anything
*/
public boolean matchesAll() {
for (byte b : data)
if (b != (byte) 0xff)
return false;
return true;
}
@Override