Mercurial > jdk8-mips64-public > langtools / annotate
test/tools/javac/generics/ParametricException.java@2eb010b6cb22 (annotated)
test/tools/javac/generics/ParametricException.java
Thu, 31 Aug 2017 15:17:03 +0800
- author
- aoqi
- date
- Thu, 31 Aug 2017 15:17:03 +0800
- changeset 2525
- 2eb010b6cb22
- parent 554
- 9d9f26857129
- parent 0
- 959103a6100f
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | */ |
| aoqi@0 | 23 | |
| aoqi@0 | 24 | /* |
| aoqi@0 | 25 | * @test |
| aoqi@0 | 26 | * @bug 4509267 |
| aoqi@0 | 27 | * @summary generics: parametric exception type versus overriding |
| aoqi@0 | 28 | * @author gafter |
| aoqi@0 | 29 | * |
| aoqi@0 | 30 | * @compile ParametricException.java |
| aoqi@0 | 31 | */ |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | import java.io.*; |
| aoqi@0 | 34 | |
| aoqi@0 | 35 | abstract class AChurchBoolean { |
| aoqi@0 | 36 | public abstract <Return, Parameter, Throws extends Throwable> |
| aoqi@0 | 37 | Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws; |
| aoqi@0 | 38 | |
| aoqi@0 | 39 | public interface IVisitor<Return, Parameter, Throws extends Throwable> { |
| aoqi@0 | 40 | public Return caseTrue(Parameter parameter) throws Throws; |
| aoqi@0 | 41 | public Return caseFalse(Parameter parameter) throws Throws; |
| aoqi@0 | 42 | } |
| aoqi@0 | 43 | } |
| aoqi@0 | 44 | |
| aoqi@0 | 45 | class TrueChurchBoolean extends AChurchBoolean { |
| aoqi@0 | 46 | private static TrueChurchBoolean instance = new TrueChurchBoolean(); |
| aoqi@0 | 47 | private TrueChurchBoolean() {} |
| aoqi@0 | 48 | public static TrueChurchBoolean singleton() { |
| aoqi@0 | 49 | return instance; |
| aoqi@0 | 50 | } |
| aoqi@0 | 51 | public <Return, Parameter, Throws extends Throwable> |
| aoqi@0 | 52 | Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws { |
| aoqi@0 | 53 | return visitor.caseTrue(parameter); |
| aoqi@0 | 54 | } |
| aoqi@0 | 55 | } |
| aoqi@0 | 56 | |
| aoqi@0 | 57 | class FalseChurchBoolean extends AChurchBoolean { |
| aoqi@0 | 58 | private static FalseChurchBoolean instance = new FalseChurchBoolean(); |
| aoqi@0 | 59 | private FalseChurchBoolean() {} |
| aoqi@0 | 60 | public static FalseChurchBoolean singleton() { |
| aoqi@0 | 61 | return instance; |
| aoqi@0 | 62 | } |
| aoqi@0 | 63 | public <Return, Parameter, Throws extends Throwable> |
| aoqi@0 | 64 | Return accept(IVisitor<Return, Parameter, Throws> visitor, Parameter parameter) throws Throws { |
| aoqi@0 | 65 | return visitor.caseFalse(parameter); |
| aoqi@0 | 66 | } |
| aoqi@0 | 67 | } |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | class Pair<T,U> { |
| aoqi@0 | 70 | private T first; |
| aoqi@0 | 71 | private U second; |
| aoqi@0 | 72 | Pair(T first, U second) { |
| aoqi@0 | 73 | this.first = first; |
| aoqi@0 | 74 | this.second = second; |
| aoqi@0 | 75 | } |
| aoqi@0 | 76 | T getFirst() { |
| aoqi@0 | 77 | return first; |
| aoqi@0 | 78 | } |
| aoqi@0 | 79 | U getSecond() { |
| aoqi@0 | 80 | return second; |
| aoqi@0 | 81 | } |
| aoqi@0 | 82 | } |
| aoqi@0 | 83 | |
| aoqi@0 | 84 | // Perhaps a bit of a toy example, but relevant nonetheless. |
| aoqi@0 | 85 | class ChurchBooleanTest { |
| aoqi@0 | 86 | private AChurchBoolean bool; |
| aoqi@0 | 87 | public ChurchBooleanTest(AChurchBoolean bool) { |
| aoqi@0 | 88 | this.bool = bool; |
| aoqi@0 | 89 | } |
| aoqi@0 | 90 | public AChurchBoolean readIf(File file, byte[] output) throws IOException { |
| aoqi@0 | 91 | return bool.accept(new AChurchBoolean.IVisitor<AChurchBoolean, Pair<File, byte[]>, IOException>() { |
| aoqi@0 | 92 | public AChurchBoolean caseTrue(Pair<File, byte[]> parameter) throws IOException { |
| aoqi@0 | 93 | FileInputStream input = new FileInputStream(parameter.getFirst()); // throws |
| aoqi@0 | 94 | input.read(parameter.getSecond()); // throws |
| aoqi@0 | 95 | input.close(); // throws |
| aoqi@0 | 96 | return TrueChurchBoolean.singleton(); |
| aoqi@0 | 97 | } |
| aoqi@0 | 98 | public AChurchBoolean caseFalse(Pair<File, byte[]> parameter) throws IOException { |
| aoqi@0 | 99 | return FalseChurchBoolean.singleton(); |
| aoqi@0 | 100 | } |
| aoqi@0 | 101 | }, new Pair<File, byte[]>(file, output)); |
| aoqi@0 | 102 | } |
| aoqi@0 | 103 | } |
