diff options
Diffstat (limited to 'dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/util/RandomString.java')
-rw-r--r-- | dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/util/RandomString.java | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/util/RandomString.java b/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/util/RandomString.java new file mode 100644 index 0000000..b889c1c --- /dev/null +++ b/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/util/RandomString.java @@ -0,0 +1,55 @@ +/*- + * ============LICENSE_START======================================================= + * org.onap.dmaap + * ================================================================================ + * 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.onap.dmaap.dbcapi.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); + } + } |