/*
* Copyright 2014 the bitcoinj authors.
*
* 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 org.bitcoinj.wallet;
import org.bitcoinj.core.*;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
/**
* A filtering coin selector delegates to another coin selector, but won't select outputs spent by the given transactions.
*/
public class FilteringCoinSelector implements CoinSelector {
protected CoinSelector delegate;
protected HashSet<TransactionOutPoint> spent = new HashSet<TransactionOutPoint>();
public FilteringCoinSelector(CoinSelector delegate) {
this.delegate = delegate;
}
public void excludeOutputsSpentBy(Transaction tx) {
for (TransactionInput input : tx.getInputs()) {
spent.add(input.getOutpoint());
}
}
@Override
public CoinSelection select(Coin target, List<TransactionOutput> candidates) {
Iterator<TransactionOutput> iter = candidates.iterator();
while (iter.hasNext()) {
TransactionOutput output = iter.next();
if (spent.contains(output.getOutPointFor())) iter.remove();
}
return delegate.select(target, candidates);
}
}