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/*-
* ============LICENSE_START=======================================================
* OpenECOMP - org.openecomp.dmaapbc
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.dmaapbc.util;
import java.util.Random;
// source: http://stackoverflow.com/questions/41107/how-to-generate-a-random-alpha-numeric-string
public class RandomString {
private static final char[] symbols;
static {
StringBuilder tmp = new StringBuilder();
for (char ch = '0'; ch <= '9'; ++ch)
tmp.append(ch);
for (char ch = 'a'; ch <= 'z'; ++ch)
tmp.append(ch);
symbols = tmp.toString().toCharArray();
}
private final Random random = new Random();
private final char[] buf;
public RandomString(int length) {
if (length < 1)
throw new IllegalArgumentException("length < 1: " + length);
buf = new char[length];
}
public String nextString() {
for (int idx = 0; idx < buf.length; ++idx)
buf[idx] = symbols[random.nextInt(symbols.length)];
return new String(buf);
}
}
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