/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.core;
import org.ethereum.db.ByteArrayWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author Roman Mandeleil
* @since 09.11.2014
*/
public class Chain {
private static final Logger logger = LoggerFactory.getLogger("blockchain");
private List<Block> chain = new ArrayList<>();
private BigInteger totalDifficulty = BigInteger.ZERO;
private Map<ByteArrayWrapper, Block> index = new HashMap<>();
public boolean tryToConnect(Block block) {
if (chain.isEmpty()) {
add(block);
return true;
}
Block lastBlock = chain.get(chain.size() - 1);
if (lastBlock.isParentOf(block)) {
add(block);
return true;
}
return false;
}
public void add(Block block) {
logger.info("adding block to alt chain block.hash: [{}] ", block.getShortHash());
totalDifficulty = totalDifficulty.add(block.getCumulativeDifficulty());
logger.info("total difficulty on alt chain is: [{}] ", totalDifficulty);
chain.add(block);
index.put(new ByteArrayWrapper(block.getHash()), block);
}
public Block get(int i) {
return chain.get(i);
}
public Block getLast() {
return chain.get(chain.size() - 1);
}
public BigInteger getTotalDifficulty() {
return totalDifficulty;
}
public void setTotalDifficulty(BigInteger totalDifficulty) {
this.totalDifficulty = totalDifficulty;
}
public boolean isParentOnTheChain(Block block) {
return (index.get(new ByteArrayWrapper(block.getParentHash())) != null);
}
public long getSize() {
return chain.size();
}
}