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Transaction: reimplement SORT_TX_BY_UPDATE_TIME and SORT_TX_BY_HEIGHT comparators in a functional way

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This commit is contained in:
Andreas Schildbach 2023-03-10 16:40:47 +01:00
parent 95549b4754
commit 034277fae0
1 changed files with 24 additions and 19 deletions
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43
core/src/main/java/org/bitcoinj/core/Transaction.java
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@ -87,29 +87,34 @@ import static org.bitcoinj.base.internal.ByteUtils.uint64ToByteStreamLE;
* <p>Instances of this class are not safe for use by multiple threads.</p>
*/
public class Transaction extends ChildMessage {
private static final Comparator<Transaction> SORT_TX_BY_ID = Comparator.comparing(Transaction::getTxId);
/**
* A comparator that can be used to sort transactions by their updateTime field. The ordering goes from most recent
* into the past.
*/
public static final Comparator<Transaction> SORT_TX_BY_UPDATE_TIME = (tx1, tx2) -> {
Instant t1 = tx1.getUpdateTimeInstant().orElse(Instant.EPOCH);
Instant t2 = tx2.getUpdateTimeInstant().orElse(Instant.EPOCH);
final int updateTimeComparison = -(t1.compareTo(t2));
//If time1==time2, compare by tx hash to make comparator consistent with equals
return updateTimeComparison != 0 ? updateTimeComparison : tx1.getTxId().compareTo(tx2.getTxId());
};
/** A comparator that can be used to sort transactions by their chain height. */
public static final Comparator<Transaction> SORT_TX_BY_HEIGHT = (tx1, tx2) -> {
final TransactionConfidence confidence1 = tx1.getConfidence();
final int height1 = confidence1.getConfidenceType() == ConfidenceType.BUILDING
? confidence1.getAppearedAtChainHeight() : Block.BLOCK_HEIGHT_UNKNOWN;
final TransactionConfidence confidence2 = tx2.getConfidence();
final int height2 = confidence2.getConfidenceType() == ConfidenceType.BUILDING
? confidence2.getAppearedAtChainHeight() : Block.BLOCK_HEIGHT_UNKNOWN;
final int heightComparison = -(Integer.compare(height1, height2));
//If height1==height2, compare by tx hash to make comparator consistent with equals
return heightComparison != 0 ? heightComparison : tx1.getTxId().compareTo(tx2.getTxId());
};
public static final Comparator<Transaction> SORT_TX_BY_UPDATE_TIME = Comparator.comparing(
Transaction::sortableUpdateTime,
Comparator.reverseOrder())
.thenComparing(SORT_TX_BY_ID);
private static Instant sortableUpdateTime(Transaction tx) {
return tx.getUpdateTimeInstant().orElse(Instant.EPOCH);
}
/**
* A comparator that can be used to sort transactions by their chain height.
*/
public static final Comparator<Transaction> SORT_TX_BY_HEIGHT = Comparator.comparing(
Transaction::sortableBlockHeight,
Comparator.reverseOrder())
.thenComparing(SORT_TX_BY_ID);
private static int sortableBlockHeight(Transaction tx) {
TransactionConfidence confidence = tx.getConfidence();
return confidence.getConfidenceType() == ConfidenceType.BUILDING ?
confidence.getAppearedAtChainHeight() :
Block.BLOCK_HEIGHT_UNKNOWN;
}
private static final Logger log = LoggerFactory.getLogger(Transaction.class);
/**