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import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import chat.dim.Facebook;

import chat.dim.compat.CompatibleMetaFactory;

import chat.dim.core.Barrack;

import chat.dim.mkm.MetaUtils;

import chat.dim.protocol.DecryptKey;

import chat.dim.protocol.Document;

import chat.dim.protocol.ID;

import chat.dim.protocol.Meta;

import chat.dim.protocol.MetaType;

import chat.dim.protocol.PrivateKey;

import chat.dim.protocol.SignKey;

public class SharedFacebook extends Facebook {

private static final SharedFacebook ourInstance = new SharedFacebook();

public static SharedFacebook getInstance() { return ourInstance; }

private SharedFacebook() {

super();

}

@Override

public Barrack getBarrack() {

// TODO:

return null;

}

// memory caches

private final Map<ID, PrivateKey> privateKeyMap = new HashMap<>();

private final Map<ID, Meta> metaMap = new HashMap<>();

protected void cachePrivateKey(PrivateKey key, ID identifier) {

if (key == null) {

privateKeyMap.remove(identifier);

} else {

privateKeyMap.put(identifier, key);

}

protected void cacheMeta(Meta meta, ID identifier) {

assert MetaUtils.matches(identifier, meta) : "meta not match ID: " + identifier + ", " + meta;

metaMap.put(identifier, meta);

}

//-------- Entity DataSource

@Override

public Meta getMeta(ID entity) {

return metaMap.get(entity);

}

@Override

public List<Document> getDocuments(ID entity) {

// TODO:

return null;

}

//------- User DataSource

@Override

public List<ID> getContacts(ID user) {

// TODO:

return null;

}

@Override

public SignKey getPrivateKeyForSignature(ID user) {

return privateKeyMap.get(user);

}

@Override

public List<DecryptKey> getPrivateKeysForDecryption(ID user) {

PrivateKey key = privateKeyMap.get(user);

if (key instanceof DecryptKey) {

List<DecryptKey> keys = new ArrayList<>();

keys.add((DecryptKey) key);

return keys;

}

return null;

}

@Override

public SignKey getPrivateKeyForVisaSignature(ID user) {

return getPrivateKeyForSignature(user);

}

//------- Group DataSource

@Override

public ID getFounder(ID group) {

// TODO:

return null;

}

@Override

public ID getOwner(ID group) {

// TODO:

return null;

}

@Override

public List<ID> getMembers(ID group) {

// TODO:

return null;

}

/**

* Meta factories

static void registerCompatibleMetaFactories() {

Meta.Factory mkm = new CompatibleMetaFactory(MetaType.MKM);

Meta.Factory btc = new CompatibleMetaFactory(MetaType.BTC);

Meta.Factory eth = new CompatibleMetaFactory(MetaType.ETH);

Meta.setFactory("1", mkm);

Meta.setFactory("2", btc);

Meta.setFactory("4", eth);

Meta.setFactory("mkm", mkm);

Meta.setFactory("btc", btc);

Meta.setFactory("eth", eth);

Meta.setFactory("MKM", mkm);

Meta.setFactory("BTC", btc);

Meta.setFactory("ETH", eth);

}

static {

new LibraryLoader().run();

registerCompatibleMetaFactories();

}

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