/*

* java-tron is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* java-tron 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 General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <http://www.gnu.org/licenses/>.

*/

package org.tron.core.db;

import org.joda.time.DateTime;

import org.joda.time.format.DateTimeFormat;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.tron.core.Sha256Hash;

import org.tron.core.capsule.BlockCapsule;

public class BlockStore extends TronDatabase<BlockCapsule> {

public static final Logger logger = LoggerFactory.getLogger("BlockStore");

private BlockCapsule head;

private BlockStore(String dbName) {

super(dbName);

}

private static BlockStore instance;

/**

* create fun.

*/

public static BlockStore create(String dbName) {

if (instance == null) {

synchronized (AccountStore.class) {

if (instance == null) {

instance = new BlockStore(dbName);

}

}

}

return instance;

}

/**

* to do.

*/

public Sha256Hash getHeadBlockId() {

return head == null ? Sha256Hash.ZERO_HASH : head.getBlockId();

}

/**

* Get the head block's number.

*/

public long getHeadBlockNum() {

return head == null ? 0 : head.getNum();

}

public DateTime getHeadBlockTime() {

return head == null ? getGenesisTime() : new DateTime(head.getTimeStamp());

}

public long currentASlot() {

return getHeadBlockNum(); // assume no missed slot

}

// genesis_time

public DateTime getGenesisTime() {

return DateTime.parse("20180101", DateTimeFormat.forPattern("yyyyMMdd"));

}

public void getUnspend(byte[] key) {

}

@Override

public void put(byte[] key, BlockCapsule item) {

}

@Override

public void delete(byte[] key) {

}

@Override

public BlockCapsule get(byte[] key) {

return null;

}

@Override

public boolean has(byte[] key) {

return false;

}

}