jdk8-mips64-public/langtools: test/tools/javac/StringsInSwitch/StringSwitches.java@8fb9b4be3cb1 (annotated)

test/tools/javac/StringsInSwitch/StringSwitches.java@8fb9b4be3cb1 (annotated)

test/tools/javac/StringsInSwitch/StringSwitches.java

Mon, 02 Nov 2009 21:36:59 -0800

author: darcy
date: Mon, 02 Nov 2009 21:36:59 -0800
changeset 430: 8fb9b4be3cb1
child 554: 9d9f26857129
permissions: -rw-r--r--

6827009: Project Coin: Strings in Switch
Reviewed-by: jjg, mcimadamore

 /*
  * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 /*
  * @test
  * @bug 6827009
  * @summary Positive tests for strings in switch.
  * @author  Joseph D. Darcy
  */
 public class StringSwitches {
     public static void main(String... args) {
         int failures = 0;
         failures += testPileup();
         failures += testSwitchingTwoWays();
         failures += testNamedBreak();
         if (failures > 0) {
             throw new RuntimeException();
         }
     }
     /*
      * A zero length string and all strings consisting only of the
      * zero character \u0000 have a hash code of zero.  This method
      * maps such strings to the number of times \u0000 appears for 0
      * through 6 occurrences.
      */
     private static int zeroHashes(String s) {
         int result = Integer.MAX_VALUE;
         switch(s) {
         case "":
             return 0;
         case "\u0000":
             result = 1; break;
         case "\u0000\u0000":
             return 2;
         case "\u0000\u0000\u0000":
             result = 3; break;
         case "\u0000\u0000\u0000\u0000":
             return 4;
         case "\u0000\u0000\u0000\u0000\u0000":
             result = 5; break;
         case "\u0000\u0000\u0000\u0000\u0000\u0000":
             return 6;
         default:
             result = -1;
         }
         return result;
     }
     private static int testPileup() {
         int failures = 0;
         String zero = "";
         for(int i = 0; i <= 6; i++, zero += "\u0000") {
             int result = zeroHashes(zero);
             if (result != i) {
                 failures++;
                 System.err.printf("For string \"%s\" unexpectedly got %d instead of %d%n.",
                                    zero, result, i);
             }
         }
         if (zeroHashes("foo") != -1) {
             failures++;
             System.err.println("Failed to get -1 for input string.");
         }
         return failures;
     }
     /**
      * Verify that a switch on an enum and a switch with the same
      * structure on the string name of an enum compute equivalent
      * values.
      */
     private static int testSwitchingTwoWays() {
         int failures = 0;
         for(MetaSynVar msv : MetaSynVar.values()) {
             int enumResult = enumSwitch(msv);
             int stringResult = stringSwitch(msv.name());
             if (enumResult != stringResult) {
                 failures++;
                 System.err.printf("One value %s, computed 0x%x with the enum switch " +
                                   "and 0x%x with the string one.%n",
                                   msv, enumResult, stringResult);
             }
         }
         return failures;
     }
     private static enum MetaSynVar {
         FOO,
         BAR,
         BAZ,
         QUX,
         QUUX,
         QUUUX,
         MUMBLE,
         FOOBAR;
     }
     private static int enumSwitch(MetaSynVar msv) {
         int result = 0;
         switch(msv) {
         case FOO:
             result |= (1<<0);
             // fallthrough:
         case BAR:
         case BAZ:
             result |= (1<<1);
             break;
         default:
             switch(msv) {
             case QUX:
                 result |= (1<<2);
                 break;
             case QUUX:
                 result |= (1<<3);
             default:
                 result |= (1<<4);
             }
             result |= (1<<5);
             break;
         case MUMBLE:
             result |= (1<<6);
             return result;
         case FOOBAR:
             result |= (1<<7);
             break;
         }
         result |= (1<<8);
         return result;
     }
     private static int stringSwitch(String msvName) {
         int result = 0;
         switch(msvName) {
         case "FOO":
             result |= (1<<0);
             // fallthrough:
         case "BAR":
         case "BAZ":
             result |= (1<<1);
             break;
         default:
             switch(msvName) {
             case "QUX":
                 result |= (1<<2);
                 break;
             case "QUUX":
                 result |= (1<<3);
             default:
                 result |= (1<<4);
             }
             result |= (1<<5);
             break;
         case "MUMBLE":
             result |= (1<<6);
             return result;
         case "FOOBAR":
             result |= (1<<7);
             break;
         }
         result |= (1<<8);
         return result;
     }
     private static int testNamedBreak() {
         int failures = 0;
         String[] testStrings  = {"a",       "b",  "c",       "d",      "e"};
         int[]    testExpected = { 0b101011, 0b101, 0b100001, 0b101000, 0b10000};
         for(int i = 0; i < testStrings.length; i++) {
             int expected = testExpected[i];
             int result = namedBreak(testStrings[i]);
             if (result != expected) {
                 failures++;
                 System.err.printf("On input %s, got %d instead of %d.%n",
                                   testStrings[i], result, expected);
             }
         }
         return failures;
     }
     private static int namedBreak(String s) {
         int result = 0;
         outer: switch(s) {
         case "a":
         case "b":
         case "c":
             result |= (1<<0);
         inner: switch(s + s) {
             case "aa":
                 result |= (1<<1);
                 break inner;
             case "cc":
                 break outer;
             default:
                 result |= (1<<2);
                 return result;
             }
         case "d":
             result |= (1<<3);
             break outer;
         default:
             return result |= (1<<4);
         }
         result |= (1<<5);
         return result;
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javac/StringsInSwitch/StringSwitches.java@8fb9b4be3cb1 (annotated)

test/tools/javac/StringsInSwitch/StringSwitches.java