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DBIterator.java
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DBIterator.java
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/**
* Copyright (C) 2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* 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 org.iq80.leveldb;
import java.io.Closeable;
import java.util.Iterator;
import java.util.Map;
/**
* @author <a href="http://hiramchirino.com">Hiram Chirino</a>
*/
public interface DBIterator extends Iterator<Map.Entry<byte[], byte[]>>, Closeable {
/**
* Repositions the iterator so the key of the next BlockElement
* returned greater than or equal to the specified targetKey.
*/
public void seek(byte[] key);
/**
* Repositions the iterator so is is at the beginning of the Database.
*/
public void seekToFirst();
/**
* Returns the next element in the iteration, without advancing the iteration.
*/
public Map.Entry<byte[], byte[]> peekNext();
/**
* @return true if there is a previous entry in the iteration.
*/
boolean hasPrev();
/**
* @return the previous element in the iteration and rewinds the iteration.
*/
Map.Entry<byte[], byte[]> prev();
/**
* @return the previous element in the iteration, without rewinding the iteration.
*/
public Map.Entry<byte[], byte[]> peekPrev();
/**
* Repositions the iterator so it is at the end of of the Database.
*/
public void seekToLast();
}