Java BloomFilter类代码示例

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
/**
 * <p>Gets a bloom filter that contains all of the public keys from this wallet, and which will provide the given
 * false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for
 * each key in the wallet, for the public key and the hash of the public key (address form).</p>
 * 
 * <p>This is used to generate a BloomFilter which can be {@link BloomFilter#merge(BloomFilter)}d with another.
 * It could also be used if you have a specific target for the filter's size.</p>
 * 
 * <p>See the docs for {@link BloomFilter#BloomFilter(int, double, long, org.bitcoinj.core.BloomFilter.BloomUpdate)} for a brief explanation of anonymity when using bloom
 * filters.</p>
 */
@Override @GuardedBy("keyChainGroupLock")
public BloomFilter getBloomFilter(int size, double falsePositiveRate, long nTweak) {
    beginBloomFilterCalculation();
    try {
        BloomFilter filter = keyChainGroup.getBloomFilter(size, falsePositiveRate, nTweak);
        for (Script script : watchedScripts) {
            for (ScriptChunk chunk : script.getChunks()) {
                // Only add long (at least 64 bit) data to the bloom filter.
                // If any long constants become popular in scripts, we will need logic
                // here to exclude them.
                if (!chunk.isOpCode() && chunk.data.length >= MINIMUM_BLOOM_DATA_LENGTH) {
                    filter.insert(chunk.data);
                }
            }
        }
        for (TransactionOutPoint point : bloomOutPoints)
            filter.insert(point.unsafeBitcoinSerialize());
        return filter;
    } finally {
        endBloomFilterCalculation();
    }
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
/**
 * <p>Gets a bloom filter that contains all of the public keys from this wallet, and which will provide the given
 * false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for
 * each key in the wallet, for the public key and the hash of the public key (address form).</p>
 * 
 * <p>This is used to generate a BloomFilter which can be {@link BloomFilter#merge(BloomFilter)}d with another.
 * It could also be used if you have a specific target for the filter's size.</p>
 * 
 * <p>See the docs for {@link BloomFilter(int, double)} for a brief explanation of anonymity when using bloom
 * filters.</p>
 */
@Override @GuardedBy("keyChainGroupLock")
public BloomFilter getBloomFilter(int size, double falsePositiveRate, long nTweak) {
    beginBloomFilterCalculation();
    try {
        BloomFilter filter = keyChainGroup.getBloomFilter(size, falsePositiveRate, nTweak);
        for (Script script : watchedScripts) {
            for (ScriptChunk chunk : script.getChunks()) {
                // Only add long (at least 64 bit) data to the bloom filter.
                // If any long constants become popular in scripts, we will need logic
                // here to exclude them.
                if (!chunk.isOpCode() && chunk.data.length >= MINIMUM_BLOOM_DATA_LENGTH) {
                    filter.insert(chunk.data);
                }
            }
        }
        for (TransactionOutPoint point : bloomOutPoints)
            filter.insert(point.unsafeBitcoinSerialize());
        return filter;
    } finally {
        endBloomFilterCalculation();
    }
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Override
public BloomFilter getFilter(int size, double falsePositiveRate, long tweak) {
    lock.lock();
    try {
        checkArgument(size >= numBloomFilterEntries());
        maybeLookAhead();
        return basicKeyChain.getFilter(size, falsePositiveRate, tweak);
    } finally {
        lock.unlock();
    }

}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Override
public BloomFilter getFilter(int size, double falsePositiveRate, long tweak) {
    lock.lock();
    try {
        BloomFilter filter = new BloomFilter(size, falsePositiveRate, tweak);
        for (ECKey key : hashToKeys.values())
            filter.insert(key);
        return filter;
    } finally {
        lock.unlock();
    }
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Test
public void bloom() throws Exception {
    ECKey key1 = new ECKey();
    ECKey key2 = new ECKey();
    chain.importKeys(key1, key2);
    assertEquals(2, chain.numKeys());
    assertEquals(4, chain.numBloomFilterEntries());
    BloomFilter filter = chain.getFilter(4, 0.001, 100);
    assertTrue(filter.contains(key1.getPubKey()));
    assertTrue(filter.contains(key1.getPubKeyHash()));
    assertTrue(filter.contains(key2.getPubKey()));
    assertTrue(filter.contains(key2.getPubKeyHash()));
    ECKey key3 = new ECKey();
    assertFalse(filter.contains(key3.getPubKey()));
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Override
public BloomFilter getFilter(int size, double falsePositiveRate, long tweak) {
    lock.lock();
    try {
        checkArgument(size >= numBloomFilterEntries(), "Bloom filter too small");
        maybeLookAhead();
        return simpleKeyChain.getFilter(size, falsePositiveRate, tweak);
    } finally {
        lock.unlock();
    }
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Test
public void testBloomFilter() {
    final List<Integer> integers = Arrays.asList(10, 100, 1000, 2000, 5000, 10000);
    for (Integer i : integers) {
        final BloomFilter res = new BloomFilter(i, 1.0E-5, System.currentTimeMillis());
        System.out.println("" + res );

    }
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
public BloomFilter getLastFilter() {
    return lastFilter;
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
@Override
public BloomFilter getFilter(int size, double falsePositiveRate, long tweak) {
    throw new RuntimeException("Not implemented");
}
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
/**
 * <p>Gets a bloom filter that contains all of the public keys from this chain, and which will provide the given
 * false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for
 * each key in the key chain, for the public key and the hash of the public key (address form). For this reason
 * size should be <i>at least</i> 2x the result of {@link #numKeys()}.</p>
 *
 * <p>This is used to generate a {@link BloomFilter} which can be {@link BloomFilter#merge(BloomFilter)}d with
 * another. It could also be used if you have a specific target for the filter's size.</p>
 *
 * <p>See the docs for {@link org.bitcoinj.core.BloomFilter#BloomFilter(int, double, long)} for a brief
 * explanation of anonymity when using bloom filters, and for the meaning of these parameters.</p>
 */
BloomFilter getFilter(int size, double falsePositiveRate, long tweak);
 

import org.bitcoinj.core.BloomFilter; //导入依赖的package包/类
/**
 * <p>Gets a bloom filter that contains all of the public keys from this chain, and which will provide the given
 * false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for
 * each key in the key chain, for the public key and the hash of the public key (address form). For this reason
 * size should be <i>at least</i> 2x the result of {@link #numKeys()}.</p>
 *
 * <p>This is used to generate a {@link BloomFilter} which can be {@link BloomFilter#merge(BloomFilter)}d with
 * another. It could also be used if you have a specific target for the filter's size.</p>
 *
 * <p>See the docs for {@link org.bitcoinj.core.BloomFilter#BloomFilter(int, double, long)} for a brief
 * explanation of anonymity when using bloom filters, and for the meaning of these parameters.</p>
 */
public BloomFilter getFilter(int size, double falsePositiveRate, long tweak);