com.mchange.io.IOByteArrayMap Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.io;
import java.io.*;
/**
* A map of byte[] to byte[] that may be disk or network bound.
* This interface is not intended to be expressed by implementations
* supporting duplicate keys.
*/
public interface IOByteArrayMap
{
/**
* Gets the byte array associated with key, or none if
* this key is not present.
*/
public byte[] get(byte[] key) throws IOException;
/**
* Associates the byte[] key with the byte[] value in
* the hash. If key is already present in the map, the
* old value associated with it is replaced by value.
*/
public void put(byte[] key, byte[] value) throws IOException;
/**
* Associates the byte[] key with the byte[] value in
* the hash. Fails (and returns false) if key is
* already present in the map.
*/
public boolean putNoReplace(byte[] key, byte[] value) throws IOException;
/**
* Removes the key, value pair whose key is the argument.
*/
public boolean remove(byte[] key) throws IOException;
/**
* Returns true iff key is present.
*/
public boolean containsKey(byte[] key) throws IOException;
/**
* Returns a list of all keys in the hash, provided no inserts
* or deletes are made while the Enumeration is untraversed.
* If inserts or deletes are made. the behavior is undefined.
*/
public IOByteArrayEnumeration keys() throws IOException;
}