1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /* @test
  27  * @run testng/othervm -ea -esa test.java.lang.invoke.ArrayLengthTest
  28  */
  29 package test.java.lang.invoke;
  30 
  31 import java.lang.invoke.MethodHandle;
  32 import java.lang.invoke.MethodHandles;
  33 
  34 import static org.testng.AssertJUnit.*;
  35 
  36 import org.testng.annotations.*;
  37 
  38 public class ArrayLengthTest {
  39 
  40     @DataProvider
  41     Object[][] arrayClasses() {
  42         return new Object[][] {
  43                 {int[].class},
  44                 {long[].class},
  45                 {float[].class},
  46                 {double[].class},
  47                 {boolean[].class},
  48                 {byte[].class},
  49                 {short[].class},
  50                 {char[].class},
  51                 {Object[].class},
  52                 {StringBuffer[].class}
  53         };
  54     }
  55 
  56     @Test(dataProvider = "arrayClasses")
  57     public void testArrayLength(Class<?> arrayClass) throws Throwable {
  58         MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
  59         assertEquals(int.class, arrayLength.type().returnType());
  60         assertEquals(arrayClass, arrayLength.type().parameterType(0));
  61         Object array = MethodHandles.arrayConstructor(arrayClass).invoke(10);
  62         assertEquals(10, arrayLength.invoke(array));
  63     }
  64 
  65     @Test(dataProvider = "arrayClasses", expectedExceptions = NullPointerException.class)
  66     public void testArrayLengthInvokeNPE(Class<?> arrayClass) throws Throwable {
  67         MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
  68         arrayLength.invoke(null);
  69     }
  70 
  71     @Test(expectedExceptions = IllegalArgumentException.class)
  72     public void testArrayLengthNoArray() {
  73         MethodHandles.arrayLength(String.class);
  74     }
  75 
  76     @Test(expectedExceptions = NullPointerException.class)
  77     public void testArrayLengthNPE() {
  78         MethodHandles.arrayLength(null);
  79     }
  80 
  81 }