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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
* Copyright (c) [2016] [ ]
* 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 .
*/
package org.ethereum.datasource;
import org.ethereum.util.ByteUtil;
/**
* When propagating changes to the backing Source XORs keys
* with the specified value
*
* May be useful for merging several Sources into a single
*
* Created by Anton Nashatyrev on 18.02.2016.
*/
public class XorDataSource extends AbstractChainedSource {
private byte[] subKey;
/**
* Creates instance with a value all keys are XORed with
*/
public XorDataSource(Source source, byte[] subKey) {
super(source);
this.subKey = subKey;
}
private byte[] convertKey(byte[] key) {
return ByteUtil.xorAlignRight(key, subKey);
}
@Override
public V get(byte[] key) {
return getSource().get(convertKey(key));
}
@Override
public void put(byte[] key, V value) {
getSource().put(convertKey(key), value);
}
@Override
public void delete(byte[] key) {
getSource().delete(convertKey(key));
}
@Override
protected boolean flushImpl() {
return false;
}
}