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// Copyright (C) 2008 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.common.data;
import com.google.gerrit.reviewdb.Account;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/** In-memory table of {@link AccountInfo}, indexed by {@link Account.Id}. */
public class AccountInfoCache {
private static final AccountInfoCache EMPTY;
static {
EMPTY = new AccountInfoCache();
EMPTY.accounts = Collections.emptyMap();
}
/** Obtain an empty cache singleton. */
public static AccountInfoCache empty() {
return EMPTY;
}
protected Map<Account.Id, AccountInfo> accounts;
protected AccountInfoCache() {
}
public AccountInfoCache(final Iterable<AccountInfo> list) {
accounts = new HashMap<Account.Id, AccountInfo>();
for (final AccountInfo ai : list) {
accounts.put(ai.getId(), ai);
}
}
/**
* Lookup the account summary
* <p>
* The return value can take on one of three forms:
* <ul>
* <li><code>null</code>, if <code>id == null</code>.</li>
* <li>a valid info block, if <code>id</code> was loaded.</li>
* <li>an anonymous info block, if <code>id</code> was not loaded.</li>
* </ul>
*
* @param id the id desired.
* @return info block for the account.
*/
public AccountInfo get(final Account.Id id) {
if (id == null) {
return null;
}
AccountInfo r = accounts.get(id);
if (r == null) {
r = new AccountInfo(id);
accounts.put(id, r);
}
return r;
}
/** Merge the information from another cache into this one. */
public void merge(final AccountInfoCache other) {
assert this != EMPTY;
accounts.putAll(other.accounts);
}
}
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