sdk/sources/android-23/org/apache/harmony/tests/java/util/ConcurrentModificationExceptionTest.java

   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 package org.apache.harmony.tests.java.util;
  19
  20 import java.util.Collection;
  21 import java.util.ConcurrentModificationException;
  22 import java.util.Iterator;
  23 import java.util.LinkedList;
  24
  25 public class ConcurrentModificationExceptionTest extends
  26         junit.framework.TestCase {
  27
  28     static public class CollectionModifier implements Runnable {
  29         Collection col;
  30
  31         boolean keepGoing = true;
  32
  33         public CollectionModifier(Collection c) {
  34             col = c;
  35         }
  36
  37         public void stopNow() {
  38             keepGoing = false;
  39         }
  40
  41         public void run() {
  42             Object someItem = new Integer(-1);
  43             while (keepGoing) {
  44                 col.add(someItem);
  45                 col.remove(someItem);
  46             }
  47         }
  48     }
  49
  50     /**
  51      * java.util.ConcurrentModificationException#ConcurrentModificationException()
  52      */
  53     public void test_Constructor() {
  54         // Test for method java.util.ConcurrentModificationException()
  55         Collection myCollection = new LinkedList();
  56         Iterator myIterator = myCollection.iterator();
  57         for (int counter = 0; counter < 50; counter++)
  58             myCollection.add(new Integer(counter));
  59         CollectionModifier cm = new CollectionModifier(myCollection);
  60         Thread collectionSlapper = new Thread(cm);
  61         try {
  62             collectionSlapper.start();
  63             while (myIterator.hasNext())
  64                 myIterator.next();
  65         } catch (ConcurrentModificationException e) {
  66             cm.stopNow();
  67             return;
  68         }
  69         cm.stopNow();
  70         // The exception should have been thrown--if the code flow makes it here
  71         // the test has failed
  72         fail("Failed to throw expected ConcurrentModificationException");
  73     }
  74
  75     /**
  76      * java.util.ConcurrentModificationException#ConcurrentModificationException(java.lang.String)
  77      */
  78     public void test_ConstructorLjava_lang_String() {
  79         // Test for method
  80         // java.util.ConcurrentModificationException(java.lang.String)
  81         String errorMessage = "This is an error message";
  82         try {
  83             // This is here to stop "unreachable code" unresolved problem
  84             if (true)
  85                 throw new ConcurrentModificationException(errorMessage);
  86         } catch (ConcurrentModificationException e) {
  87             assertTrue("Exception thrown without error message", e.getMessage()
  88                     .equals(errorMessage));
  89             return;
  90         }
  91         fail("Failed to throw expected ConcurrentModificationException");
  92     }
  93
  94     /**
  95      * Sets up the fixture, for example, open a network connection. This method
  96      * is called before a test is executed.
  97      */
  98     protected void setUp() {
  99     }
 100
 101     /**
 102      * Tears down the fixture, for example, close a network connection. This
 103      * method is called after a test is executed.
 104      */
 105     protected void tearDown() {
 106     }
 107 }