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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 
     18 /**
     19 * @author Vladimir N. Molotkov
     20 * @version $Revision$
     21 */
     22 
     23 package org.apache.harmony.security.tests.support;
     24 
     25 import java.util.Properties;
     26 
     27 /**
     28  * Test utility class
     29  */
     30 public class TestUtils {
     31 
     32     /**
     33      * No need to instantiate
     34      */
     35     private TestUtils() {
     36     }
     37 
     38     /**
     39      * Prints byte array <code>data</code> as hex to the
     40      * <code>System.out</code> in the customizable form.
     41      *
     42      * @param perLine how many numbers put on single line
     43      * @param prefix custom output number prefix
     44      * @param delimiter custom output number delimiter
     45      * @param data data to be printed
     46      */
     47     public static void printAsHex(int perLine,
     48                                   String prefix,
     49                                   String delimiter,
     50                                   byte[] data) {
     51         for (int i=0; i<data.length; i++) {
     52             String tail = Integer.toHexString(0x000000ff & data[i]);
     53             if (tail.length() == 1) {
     54                 tail = "0" + tail;
     55             }
     56             System.out.print(prefix + "0x" + tail + delimiter);
     57 
     58             if (((i+1)%perLine) == 0) {
     59                 System.out.println("");
     60             }
     61         }
     62         System.out.println("");
     63     }
     64 
     65     /**
     66      * Sets system property
     67      *
     68      * @param key - the name of the system property.
     69      * @param value - the value to be set
     70      */
     71     public static void setSystemProperty(String key, String value) {
     72         Properties properties = System.getProperties();
     73         if (value == null) {
     74             properties.remove(key);
     75         } else {
     76             properties.setProperty(key, value);
     77         }
     78         System.setProperties(properties);
     79     }
     80 }
     81