/**
* Copyright 2013-2015 Seagate Technology LLC.
*
* This Source Code Form is subject to the terms of the Mozilla
* Public License, v. 2.0. If a copy of the MPL was not
* distributed with this file, You can obtain one at
* https://mozilla.org/MP:/2.0/.
*
* This program is distributed in the hope that it will be useful,
* but is provided AS-IS, WITHOUT ANY WARRANTY; including without
* the implied warranty of MERCHANTABILITY, NON-INFRINGEMENT or
* FITNESS FOR A PARTICULAR PURPOSE. See the Mozilla Public
* License for more details.
*
* See www.openkinetic.org for more project information
*/
package com.seagate.kinetic;
/**
*
* Generate key/value pair.
*
*/
public class KVGenerator {
private final int alignLength = ("" + Integer.MAX_VALUE).length() + 1;
private String keyPrefix = "key";
private String valuePrefix = "value";
private int start = 0;
private int current = 0;
/**
*
* Generate key.
*
* @param id
* key's number
* @return string
* a string of key
*/
private String align(int id) {
String idAsString = "" + id;
int length = idAsString.length();
for (int i = 0; i < alignLength - length; i++) {
idAsString = "0" + idAsString;
}
return idAsString;
}
/**
*
* Reset the current location to start.
*
*/
public void reset() {
this.current = start;
}
/**
*
* Get next key.
*
* @return string
* a string of key
*/
public synchronized String getNextKey() {
if (current >= Integer.MAX_VALUE) {
throw new RuntimeException("out of keys");
}
return keyPrefix + align(current++);
}
/**
*
* Generate value.
*
* @param key
* a string key
* @return string
* a string of value
*/
public String getValue(String key) {
int keyId = Integer.parseInt(key.replaceAll(keyPrefix, ""));
return valuePrefix + keyId;
}
}