/**

* Copyright 2013 Ronald W Hoffman

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

package JavaBitcoin;

import java.io.ByteArrayInputStream;

import java.io.EOFException;

import java.io.IOException;

/**

* <p>The 'filterload' message supplies a Bloom filter to select transactions

* of interest to the requester. The requester will be notified when transactions

* are received that match the supplied filter. The requester can then respond

* with a 'getdata' message to request Merkle blocks for those transactions.</p>

*

* <p>FilterLoad Message</p>

* <pre>

* Size Field Description

* ==== ===== ===========

* VarInt byteCount Number of bytes in the filter (maximum of 36,000)

* Variable filter Bloom filter

* 4 bytes nHashFuncs Number of hash functions

* 4 bytes nTweak Random value to add to seed value

* 1 byte nFlags Matching flags

* </pre>

*/

public class FilterLoadMessage {

/**

* Creates the Bloom filter

*

* @param msg Message

* @param inStream Input message stream

* @throws EOFException End-of-data processing input stream

* @throws IOException Unable to read input stream

* @throws VerificationException Verification error

*/

public static void processFilterLoadMessage(Message msg, ByteArrayInputStream inStream)

throws EOFException, IOException, VerificationException {

Peer peer = msg.getPeer();

BloomFilter filter = new BloomFilter(inStream);

BloomFilter oldFilter = peer.getBloomFilter();

filter.setPeer(peer);

peer.setBloomFilter(filter);

//

// Add the filter to the list of Bloom filters

//

synchronized(Parameters.lock) {

if (oldFilter != null)

Parameters.bloomFilters.remove(filter);

Parameters.bloomFilters.add(filter);

}

}

}