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// --- BEGIN COPYRIGHT BLOCK ---
// This program 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; version 2 of the License.
//
// This program 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2013 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cmscore.dbs;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import com.netscape.certsrv.apps.CMS;
/**
* This class implements in-memory database.
*
* @author Endi S. Dewata
*/
public class Database<E> {
public final static int DEFAULT_SIZE = 20;
public String name;
public Map<String, E> records = new LinkedHashMap<String, E>();
public Database(String name) {
this.name = name;
CMS.debug("Initializing " + name + " database");
}
/**
* Find records matching filter
*/
public Collection<E> findRecords(String filter) throws Exception {
Collection<E> results = new ArrayList<E>();
for (String id : records.keySet()) {
if (filter != null && !id.contains(filter)) continue;
results.add(records.get(id));
}
return results;
}
public E getRecord(String id) throws Exception {
if (!records.containsKey(id)) {
throw new Exception(name + " " + id + " does not exist.");
}
return records.get(id);
}
public void addRecord(String id, E record) throws Exception {
if (records.containsKey(id)) {
throw new Exception(name + " " + id + " already exists.");
}
records.put(id, record);
}
public void updateRecord(String id, E record) throws Exception {
if (!records.containsKey(id)) {
throw new Exception(name + " " + id + " does not exist.");
}
records.put(id, record);
}
public void removeRecord(String id) throws Exception {
if (!records.containsKey(id)) {
throw new Exception(name + " " + id + " does not exist.");
}
records.remove(id);
}
}
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