@Override
public void verifyDifficultyTransitions(
StoredBlock prevBlock, Block added, NetworkParameters params) {
int diffMode = 1;
final int heightInc = prevBlock.getHeight() + 1;
if (CoinDefinition.TEST_NETWORK_STANDARD.equals(params.getStandardNetworkId())) {
if (heightInc >= 2000) {
diffMode = 4;
}
} else {
if (heightInc >= 68589) {
diffMode = 4;
} else if (heightInc >= 34140) {
diffMode = 3;
} else if (heightInc >= 15200) {
diffMode = 2;
}
}
try {
switch (diffMode) {
case 4:
darkGravityWave3Check(
prevBlock, added, linearExtension.getBlockChain().getBlockStore(), params);
return;
case 1:
linearExtension.verifyDifficultyTransitions(prevBlock, added, params);
return;
case 2:
kimotoGravityWellCheck(
prevBlock, added, linearExtension.getBlockChain().getBlockStore(), params);
return;
case 3:
darkGravityWaveCheck(
prevBlock, added, linearExtension.getBlockChain().getBlockStore(), params);
return;
default:
throw new RuntimeException("Unreachable");
}
} catch (BlockStoreException ex) {
throw new VerificationException(
"Block store exception during difficulty transitions check", ex);
}
}
@Nullable
Sha256Hash getHashByHeight(int height) {
Preconditions.checkArgument(height >= 0, "Height mustn't be negative");
final AbstractBlockChain blockChain = linearExtension.getBlockChain();
StoredBlock currentBlock = blockChain.getChainHead();
if (currentBlock == null || currentBlock.getHeight() < height) {
return null;
}
final BlockStore blockStore = blockChain.getBlockStore();
try {
while (currentBlock.getHeight() > height) {
currentBlock = currentBlock.getPrev(blockStore);
if (currentBlock == null) return null;
}
return currentBlock.getHeader().getHash();
} catch (BlockStoreException ex) {
log.error("Error while descending the chain", ex);
return null;
}
}
public AbstractBlockChain getBlockChain() {
return linearExtension.getBlockChain();
}