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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* 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 ch.systemsx.cisd.hdf5.h5ar;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import ch.systemsx.cisd.base.unix.Unix;
import ch.systemsx.cisd.base.unix.Unix.Stat;
/**
* Cache for ID -> Name mapping.
*
* @author Bernd Rinn
*/
final class IdCache
{
/** Gid -> Group Name */
private final Map<Integer, String> gidMap = Collections
.synchronizedMap(new HashMap<Integer, String>());
/** Uid -> User Name */
private final Map<Integer, String> uidMap = Collections
.synchronizedMap(new HashMap<Integer, String>());
/**
* Returns the name for the given <var>uid</var>.
*/
String getUser(LinkRecord link, boolean numeric)
{
return getUser(link.getUid(), numeric);
}
/**
* Returns the name for the given <var>uid</var>.
*/
String getUser(Stat link, boolean numeric)
{
return getUser(link.getUid(), numeric);
}
String getUser(int uid, boolean numeric)
{
String userNameOrNull = uidMap.get(uid);
if (userNameOrNull == null)
{
userNameOrNull =
(numeric == false && Unix.isOperational()) ? Unix.tryGetUserNameForUid(uid)
: null;
if (userNameOrNull == null)
{
userNameOrNull = Integer.toString(uid);
}
uidMap.put(uid, userNameOrNull);
}
return userNameOrNull;
}
/**
* Returns the name for the given <var>gid</var>.
*/
String getGroup(LinkRecord link, boolean numeric)
{
return getGroup(link.getGid(), numeric);
}
/**
* Returns the name for the given <var>gid</var>.
*/
String getGroup(Stat link, boolean numeric)
{
return getGroup(link.getGid(), numeric);
}
/**
* Returns the name for the given <var>gid</var>.
*/
String getGroup(int gid, boolean numeric)
{
String groupNameOrNull = gidMap.get(gid);
if (groupNameOrNull == null)
{
groupNameOrNull =
(numeric == false && Unix.isOperational()) ? Unix.tryGetGroupNameForGid(gid)
: null;
if (groupNameOrNull == null)
{
groupNameOrNull = Integer.toString(gid);
}
gidMap.put(gid, groupNameOrNull);
}
return groupNameOrNull;
}
}
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