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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 java.util.ArrayList;
import java.util.List;
/**
* Represents a chain of Sources as a single Source
* All calls to this Source are delegated to the last Source in the chain
* On flush all Sources in chain are flushed in reverse order
*
* Created by Anton Nashatyrev on 07.12.2016.
*/
public class SourceChainBox
extends AbstractChainedSource {
List chain = new ArrayList<>();
Source lastSource;
public SourceChainBox(Source source) {
super(source);
}
/**
* Adds next Source in the chain to the collection
* Sources should be added from most bottom (connected to the backing Source)
* All calls to the SourceChainBox will be delegated to the last added
* Source
*/
public void add(Source src) {
chain.add(src);
lastSource = src;
}
@Override
public void put(Key key, Value val) {
lastSource.put(key, val);
}
@Override
public Value get(Key key) {
return lastSource.get(key);
}
@Override
public void delete(Key key) {
lastSource.delete(key);
}
// @Override
// public boolean flush() {
//// boolean ret = false;
//// for (int i = chain.size() - 1; i >= 0 ; i--) {
//// ret |= chain.get(i).flush();
//// }
// return lastSource.flush();
// }
@Override
protected boolean flushImpl() {
return lastSource.flush();
}
}
