| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package org.apache.hadoop.util; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| public class TestGenericsUtil extends TestCase { |
| |
| public void testToArray() { |
| |
| //test a list of size 10 |
| List<Integer> list = new ArrayList<Integer>(); |
| |
| for(int i=0; i<10; i++) { |
| list.add(i); |
| } |
| |
| Integer[] arr = GenericsUtil.toArray(list); |
| |
| for (int i = 0; i < arr.length; i++) { |
| assertEquals(list.get(i), arr[i]); |
| } |
| } |
| |
| public void testWithEmptyList() { |
| try { |
| List<String> list = new ArrayList<String>(); |
| String[] arr = GenericsUtil.toArray(list); |
| fail("Empty array should throw exception"); |
| System.out.println(arr); //use arr so that compiler will not complain |
| |
| }catch (IndexOutOfBoundsException ex) { |
| //test case is successful |
| } |
| } |
| |
| public void testWithEmptyList2() { |
| List<String> list = new ArrayList<String>(); |
| //this method should not throw IndexOutOfBoundsException |
| String[] arr = GenericsUtil.<String>toArray(String.class, list); |
| |
| assertEquals(0, arr.length); |
| } |
| |
| /** This class uses generics */ |
| private class GenericClass<T> { |
| T dummy; |
| List<T> list = new ArrayList<T>(); |
| |
| void add(T item) { |
| list.add(item); |
| } |
| |
| T[] funcThatUsesToArray() { |
| T[] arr = GenericsUtil.toArray(list); |
| return arr; |
| } |
| } |
| |
| public void testWithGenericClass() { |
| |
| GenericClass<String> testSubject = new GenericClass<String>(); |
| |
| testSubject.add("test1"); |
| testSubject.add("test2"); |
| |
| try { |
| //this cast would fail, if we had not used GenericsUtil.toArray, since the |
| //rmethod would return Object[] rather than String[] |
| String[] arr = testSubject.funcThatUsesToArray(); |
| |
| assertEquals("test1", arr[0]); |
| assertEquals("test2", arr[1]); |
| |
| }catch (ClassCastException ex) { |
| fail("GenericsUtil#toArray() is not working for generic classes"); |
| } |
| |
| } |
| |
| public void testGenericOptionsParser() throws Exception { |
| GenericOptionsParser parser = new GenericOptionsParser( |
| new Configuration(), new String[] {"-jt"}); |
| assertEquals(parser.getRemainingArgs().length, 0); |
| |
| // test if -D accepts -Dx=y=z |
| parser = |
| new GenericOptionsParser(new Configuration(), |
| new String[] {"-Dx=y=z"}); |
| assertEquals(parser.getConfiguration().get("x"), "y=z"); |
| } |
| |
| public void testGetClass() { |
| |
| //test with Integer |
| Integer x = new Integer(42); |
| Class<Integer> c = GenericsUtil.getClass(x); |
| assertEquals(Integer.class, c); |
| |
| //test with GenericClass<Integer> |
| GenericClass<Integer> testSubject = new GenericClass<Integer>(); |
| Class<GenericClass<Integer>> c2 = GenericsUtil.getClass(testSubject); |
| assertEquals(GenericClass.class, c2); |
| } |
| |
| } |