/*
* 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.config.SystemProperties;
import org.ethereum.crypto.HashUtil;
import org.ethereum.util.FastByteComparisons;
import org.ethereum.util.RLP;
import org.ethereum.util.RLPList;
import org.spongycastle.util.encoders.Hex;
import java.math.BigInteger;
import static org.ethereum.crypto.HashUtil.*;
import static org.ethereum.util.FastByteComparisons.equal;
public class AccountState {
private byte[] rlpEncoded;
/* A value equal to the number of transactions sent
* from this address, or, in the case of contract accounts,
* the number of contract-creations made by this account */
private final BigInteger nonce;
/* A scalar value equal to the number of Wei owned by this address */
private final BigInteger balance;
/* A 256-bit hash of the root node of a trie structure
* that encodes the storage contents of the contract,
* itself a simple mapping between byte arrays of size 32.
* The hash is formally denoted σ[a] s .
*
* Since I typically wish to refer not to the trie’s root hash
* but to the underlying set of key/value pairs stored within,
* I define a convenient equivalence TRIE (σ[a] s ) ≡ σ[a] s .
* It shall be understood that σ[a] s is not a ‘physical’ member
* of the account and does not contribute to its later serialisation */
private final byte[] stateRoot;
/* The hash of the EVM code of this contract—this is the code
* that gets executed should this address receive a message call;
* it is immutable and thus, unlike all other fields, cannot be changed
* after construction. All such code fragments are contained in
* the state database under their corresponding hashes for later
* retrieval */
private final byte[] codeHash;
public AccountState(SystemProperties config) {
this(config.getBlockchainConfig().getCommonConstants().getInitialNonce(), BigInteger.ZERO);
}
public AccountState(BigInteger nonce, BigInteger balance) {
this(nonce, balance, EMPTY_TRIE_HASH, EMPTY_DATA_HASH);
}
public AccountState(BigInteger nonce, BigInteger balance, byte[] stateRoot, byte[] codeHash) {
this.nonce = nonce;
this.balance = balance;
this.stateRoot = stateRoot == EMPTY_TRIE_HASH || equal(stateRoot, EMPTY_TRIE_HASH) ? EMPTY_TRIE_HASH : stateRoot;
this.codeHash = codeHash == EMPTY_DATA_HASH || equal(codeHash, EMPTY_DATA_HASH) ? EMPTY_DATA_HASH : codeHash;
}
public AccountState(byte[] rlpData) {
this.rlpEncoded = rlpData;
RLPList items = (RLPList) RLP.decode2(rlpEncoded).get(0);
this.nonce = items.get(0).getRLPData() == null ? BigInteger.ZERO
: new BigInteger(1, items.get(0).getRLPData());
this.balance = items.get(1).getRLPData() == null ? BigInteger.ZERO
: new BigInteger(1, items.get(1).getRLPData());
this.stateRoot = items.get(2).getRLPData();
this.codeHash = items.get(3).getRLPData();
}
public BigInteger getNonce() {
return nonce;
}
public AccountState withNonce(BigInteger nonce) {
return new AccountState(nonce, balance, stateRoot, codeHash);
}
public byte[] getStateRoot() {
return stateRoot;
}
public AccountState withStateRoot(byte[] stateRoot) {
return new AccountState(nonce, balance, stateRoot, codeHash);
}
public AccountState withIncrementedNonce() {
return new AccountState(nonce.add(BigInteger.ONE), balance, stateRoot, codeHash);
}
public byte[] getCodeHash() {
return codeHash;
}
public AccountState withCodeHash(byte[] codeHash) {
return new AccountState(nonce, balance, stateRoot, codeHash);
}
public BigInteger getBalance() {
return balance;
}
public AccountState withBalanceIncrement(BigInteger value) {
return new AccountState(nonce, balance.add(value), stateRoot, codeHash);
}
public byte[] getEncoded() {
if (rlpEncoded == null) {
byte[] nonce = RLP.encodeBigInteger(this.nonce);
byte[] balance = RLP.encodeBigInteger(this.balance);
byte[] stateRoot = RLP.encodeElement(this.stateRoot);
byte[] codeHash = RLP.encodeElement(this.codeHash);
this.rlpEncoded = RLP.encodeList(nonce, balance, stateRoot, codeHash);
}
return rlpEncoded;
}
public boolean isEmpty() {
return FastByteComparisons.equal(codeHash, EMPTY_DATA_HASH) &&
BigInteger.ZERO.equals(balance) &&
BigInteger.ZERO.equals(nonce);
}
public String toString() {
String ret = " Nonce: " + this.getNonce().toString() + "\n" +
" Balance: " + getBalance() + "\n" +
" State Root: " + Hex.toHexString(this.getStateRoot()) + "\n" +
" Code Hash: " + Hex.toHexString(this.getCodeHash());
return ret;
}
}