com.qwazr.database.store.keys.KeysAbstract Maven / Gradle / Ivy
/**
* Copyright 2015-2016 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.keys;
import com.qwazr.database.store.KeyIterator;
import com.qwazr.database.store.KeyStore;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Map;
public abstract class KeysAbstract extends KeyAbstract {
public KeysAbstract(KeyEnum keyType) {
super(keyType, null);
}
final public int deleteAll(KeyStore store) throws IOException {
byte[] myKey = getCachedKey();
ByteBuffer bb = ByteBuffer.wrap(myKey);
try (final KeyIterator iterator = store.iterator(myKey)) {
int count = 0;
while (iterator.hasNext()) {
Map.Entry entry = iterator.next();
byte[] key = entry.getKey();
if (key.length < myKey.length)
break;
if (!bb.equals(ByteBuffer.wrap(key, 0, myKey.length)))
break;
store.delete(key);
count++;
}
return count;
}
}
}