com.qwazr.database.store.KeyStore Maven / Gradle / Ivy
/*
* Copyright 2015-2018 Emmanuel Keller / QWAZR
*
* 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.qwazr.database.store;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
public interface KeyStore extends Closeable {
Impl getImplementation();
boolean exists();
void delete() throws IOException;
byte[] get(byte[] key);
void put(byte[] key, byte[] value) throws IOException;
void delete(byte[] key) throws IOException;
KeyIterator iterator(byte[] key);
enum Impl {
leveldb(KeyStoreLevelDb.class, "storedb"), lmdb(KeyStoreLmdb.class, "lmdb");
final public Class storeClass;
final public String directoryName;
Impl(Class storeClass, final String directoryName) {
this.storeClass = storeClass;
this.directoryName = directoryName;
}
public static Impl detect(final File directory) {
if (!directory.exists())
return null;
for (Impl impl : values())
if (new File(directory, impl.directoryName).exists())
return impl;
return null;
}
}
}