[DMAAP-BC] Consolidate bus controller repos

[dmaap/buscontroller.git] / dmaap-bc / src / main / java / org / onap / dmaap / dbcapi / util / RandomString.java

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 (file)
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);
+         }
+       }