aoqi@0: /*
aoqi@0:  * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * @test
aoqi@0:  * @bug 6827009
aoqi@0:  * @summary Positive tests for strings in switch with few alternatives.
aoqi@0:  * @compile/fail -source 6 OneCaseSwitches.java
aoqi@0:  * @compile                OneCaseSwitches.java
aoqi@0:  * @run main OneCaseSwitches
aoqi@0:  * @author  Joseph D. Darcy
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.lang.reflect.*;
aoqi@0: import java.lang.annotation.*;
aoqi@0: import java.util.*;
aoqi@0: import static java.lang.annotation.RetentionPolicy.*;
aoqi@0: 
aoqi@0: public class OneCaseSwitches {
aoqi@0:     @Retention(RUNTIME)
aoqi@0:     @interface TestMeForNull {}
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int zeroCasesNoDefault(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 0;
aoqi@0:         switch(s) {
aoqi@0:         }
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int zeroCasesWithDefault(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 2;
aoqi@0:         boolean addResult;
aoqi@0: 
aoqi@0:         switch(s) {
aoqi@0:         default:
aoqi@0:             failures = 0;
aoqi@0:             addResult = stringSet.add(s);
aoqi@0:             if (addResult != expected) {
aoqi@0:                 failures++;
aoqi@0:                 System.err.println("zeroCaseWithDefault: Expectedly got add result of " + addResult +
aoqi@0:                                    " on string " + s);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int zeroCasesWithDefaultBreak(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 2;
aoqi@0:         boolean addResult;
aoqi@0: 
aoqi@0:         switch(s) {
aoqi@0:         default:
aoqi@0:             failures = zeroCasesWithDefault(s, stringSet, expected);
aoqi@0:             break;
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int oneCaseNoDefault(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 2;
aoqi@0:         boolean addResult;
aoqi@0: 
aoqi@0:         switch(s) {
aoqi@0:         case "foo":
aoqi@0:             failures = 0;
aoqi@0:             addResult = stringSet.add(s);
aoqi@0:             if (addResult != expected) {
aoqi@0:                 failures++;
aoqi@0:                 System.err.println("oneCaseNoDefault: Unexpectedly got add result of " + addResult +
aoqi@0:                                    " on string " + s);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int oneCaseNoDefaultBreak(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 2;
aoqi@0:         boolean addResult;
aoqi@0: 
aoqi@0:         switch(s) {
aoqi@0:         case "foo":
aoqi@0:             failures = oneCaseNoDefaultBreak(s, stringSet, expected);
aoqi@0:             break;
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int oneCaseWithDefault(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 2;
aoqi@0:         boolean addResult;;
aoqi@0: 
aoqi@0:         switch(s) {
aoqi@0:         case "foo":
aoqi@0:             failures = 0;
aoqi@0:             addResult = stringSet.add(s);
aoqi@0:             if (addResult != expected) {
aoqi@0:                 failures++;
aoqi@0:                 System.err.println("oneCaseNoDefault: Expectedly got add result of " + addResult +
aoqi@0:                                    " on string " + s);
aoqi@0:             }
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             break;
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int oneCaseBreakOnly(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 1;
aoqi@0:         switch(s) {
aoqi@0:         case "foo":
aoqi@0:             break;
aoqi@0:         }
aoqi@0:         failures = 0;
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @TestMeForNull
aoqi@0:     public static int oneCaseDefaultBreakOnly(String s, Set<String> stringSet, boolean expected) {
aoqi@0:         int failures = 1;
aoqi@0:         switch(s) {
aoqi@0:         default:
aoqi@0:             break;
aoqi@0:         }
aoqi@0:         failures = 0;
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     static int testNullBehavior() {
aoqi@0:         int failures = 0;
aoqi@0:         int count = 0;
aoqi@0: 
aoqi@0:         Method[] methods = OneCaseSwitches.class.getDeclaredMethods();
aoqi@0: 
aoqi@0:         try {
aoqi@0:             for(Method method : methods) {
aoqi@0:                 count++;
aoqi@0:                 try {
aoqi@0:                     if (method.isAnnotationPresent(TestMeForNull.class)) {
aoqi@0:                         System.out.println("Testing method " + method);
aoqi@0:                         method.invoke(null, (String)null, emptyStringSet, false);
aoqi@0:                         failures++;
aoqi@0:                         System.err.println("Didn't get NPE as expected from " + method);
aoqi@0:                     }
aoqi@0:                 } catch (InvocationTargetException ite) { // Expected
aoqi@0:                     Throwable targetException = ite.getTargetException();
aoqi@0:                     if (! (targetException instanceof NullPointerException)) {
aoqi@0:                         failures++; // Wrong exception thrown
aoqi@0:                         System.err.println("Didn't get expected target exception NPE, got " +
aoqi@0:                                            ite.getClass().getName());
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         } catch (Exception e) {
aoqi@0:             throw new RuntimeException(e);
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (count == 0) {
aoqi@0:             failures++;
aoqi@0:             System.err.println("Did not find any annotated methods.");
aoqi@0:         }
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     static int testZeroCases() {
aoqi@0:         int failures = 0;
aoqi@0:         Set<String> noDefaultSet = new HashSet<String>();
aoqi@0:         Set<String> defaultSet   = new HashSet<String>();
aoqi@0: 
aoqi@0:         zeroCasesNoDefault(FOO, noDefaultSet, false);
aoqi@0:         for(String word : words) {
aoqi@0:             zeroCasesNoDefault(word, noDefaultSet, false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (!noDefaultSet.isEmpty()) {
aoqi@0:             failures++;
aoqi@0:             System.err.println("Non-empty set after zeroCasesNoDefault");
aoqi@0:         }
aoqi@0: 
aoqi@0:         for(String word : words) {
aoqi@0:             zeroCasesWithDefault(word, defaultSet, true);
aoqi@0:         }
aoqi@0:         if (defaultSet.size() != words.length) {
aoqi@0:             failures++;
aoqi@0:             System.err.println("Missing strings after zeroCasesWithDefault");
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     static int testOneCaseNoDefault() {
aoqi@0:         int failures = 0;
aoqi@0:         Set<String> s = new HashSet<String>();
aoqi@0:         s.add("foo");
aoqi@0:         Set<String> fooSet = Collections.unmodifiableSet(s);
aoqi@0:         Set<String> testSet   = new HashSet<String>();
aoqi@0: 
aoqi@0:         oneCaseNoDefault(FOO, testSet, true);
aoqi@0:         if (!testSet.equals(fooSet)) {
aoqi@0:             failures++;
aoqi@0:             System.err.println("Unexpected result from oneCaseNoDefault: didn't get {\"Foo\"}");
aoqi@0:         }
aoqi@0: 
aoqi@0:         for(String word : words) {
aoqi@0:             oneCaseNoDefault(word, testSet, false);
aoqi@0:         }
aoqi@0:         if (!testSet.equals(fooSet)) {
aoqi@0:             failures++;
aoqi@0:             System.err.println("Unexpected result from oneCaseNoDefault: didn't get {\"Foo\"}");
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     static int testBreakOnly() {
aoqi@0:         int failures = 0;
aoqi@0: 
aoqi@0:         for(String word : words) {
aoqi@0:             failures += oneCaseBreakOnly(word, emptyStringSet, true);
aoqi@0:             failures += oneCaseDefaultBreakOnly(word, emptyStringSet, true);
aoqi@0:         }
aoqi@0: 
aoqi@0:         return failures;
aoqi@0:     }
aoqi@0: 
aoqi@0:     static int testExpressionEval() {
aoqi@0:         String s = "a";
aoqi@0:         int errors = 2;
aoqi@0: 
aoqi@0:         System.out.println("Testing expression evaluation.");
aoqi@0: 
aoqi@0:         switch (s + s) {
aoqi@0:         case "aa":
aoqi@0:             errors = 0;
aoqi@0:             break;
aoqi@0: 
aoqi@0:         case "aaaa":
aoqi@0:             errors = 1;
aoqi@0:             System.err.println("Suspected bad expression evaluation.");
aoqi@0:             break;
aoqi@0: 
aoqi@0:         default:
aoqi@0:              throw new RuntimeException("Should not reach here.");
aoqi@0:         }
aoqi@0:         return errors;
aoqi@0:     }
aoqi@0: 
aoqi@0:     static final String FOO = "foo";
aoqi@0: 
aoqi@0:     static final String[] words = {"baz",
aoqi@0:                                    "quux",
aoqi@0:                                    "wombat",
aoqi@0:                                    "\u0ccc\u0012"}; // hash collision with "foo"
aoqi@0: 
aoqi@0:     final static Set<String> emptyStringSet = Collections.emptySet();
aoqi@0: 
aoqi@0:     public static void main(String... args) {
aoqi@0:         int failures = 0;
aoqi@0: 
aoqi@0:         failures += testNullBehavior();
aoqi@0:         failures += testZeroCases();
aoqi@0:         failures += testOneCaseNoDefault();
aoqi@0:         failures += testBreakOnly();
aoqi@0:         failures += testExpressionEval();
aoqi@0: 
aoqi@0:         if (failures > 0) {
aoqi@0:             throw new RuntimeException();
aoqi@0:         }
aoqi@0:     }
aoqi@0: }