user/test/com/google/gwt/dev/shell/rewrite/client/EmmaClassLoadingTest.java

/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed 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 com.google.gwt.dev.shell.rewrite.client;

import com.google.gwt.junit.client.GWTTestCase;

import junit.framework.TestCase;

/**
 * Test-case to check if the jsni blocks are mapped correctly between the
 * synthetic and anonymous classes generated by the javac and the jdt compiler.
 * <p>
 * This issue arises when emma.jar is in the classpath. Gwt then follows the
 * emma strategy and loads (offline-instrumented) classes from the disk. These
 * classes could have been generated by any java compiler -- the java compiler
 * does not have to be jdt and frequently is javac. These class files may
 * contain references to synthetic classes and anonymous classes that the jdt
 * does not know about. This testcase checks that gwt handles these cases
 * correctly.
 */
public class EmmaClassLoadingTest extends GWTTestCase {

  enum EnumClass {
    A, B, C,
  }

  interface TestInterface {
    void foo();
  }

  private static String messages[] = {
      "1a foo", "1b foo", "1enum A", "1d foo", "1e foo"};

  private static int logCount = 0;

  private static void log(String msg) {
    assertEquals(messages[logCount++], msg);
  }

  @Override
  public String getModuleName() {
    return "com.google.gwt.dev.shell.rewrite.EmmaClassLoadingTest";
  }

  public void test1() {
    TestInterface a = new TestInterface() {
      public void foo() {
        log("1a foo");
      }
    };
    a.foo();

    TestInterface b = new TestInterface() {
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.EmmaClassLoadingTest::log(Ljava/lang/String;)("1b foo");
      }-*/;
    };
    b.foo();

    if (false) {
      TestInterface c = new TestInterface() {
        public native void foo() /*-{
          @com.google.gwt.dev.shell.rewrite.client.EmmaClassLoadingTest::log(Ljava/lang/String;)("ANY_FOO_1");
        }-*/;
      };
    }
    EnumClass et = EnumClass.A;
    switch (et) {
      case A:
        log("1enum A");
        break;
      case B:
        log("ANY_FOO_2");
        break;
      case C:
        log("ANY_FOO_3");
        break;
    }

    TestInterface d = new TestInterface() {
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.EmmaClassLoadingTest::log(Ljava/lang/String;)("1d foo");
      }-*/;
    };
    d.foo();

    /*
     * jdt generates $1 (a), $2 (b), $3 (d), $4 (e). javac generates $1 (a), $2
     * (b), $3 (c), $4 (d), $5 (e), $6 (synthetic). Added e so that the test
     * fails quickly. Otherwise, it had to wait for a time-out (in looking
     * through jdt generated code for non-existent jsni methods of $4) to fail.
     */
    TestInterface e = new TestInterface() {
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.EmmaClassLoadingTest::log(Ljava/lang/String;)("1e foo");
      }-*/;
    };
    e.foo();
  }

  public void test2() {
//    SecondTopLevelClass second = new SecondTopLevelClass();
    SecondTopLevelClass.InnerClass.test();
  }

  public void test3() {
    ThirdTopLevelClass third = new ThirdTopLevelClass();
    third.test();
  }

  public void test4() {
    FourthTopLevelClass fourth = new FourthTopLevelClass();
    fourth.test();
  }

}

/**
 * Check that the algorithm correctly maps named inner classes. In this example,
 * jdt generates $1Foo and $2Foo whereas javac generates $2Foo and $3Foo.
 * 
 */
class FourthTopLevelClass extends TestCase {
  private static String messages[] = {"4a foo"};

  private static int logCount = 0;

  @SuppressWarnings("unused") // used by JSNI
  private static void log(String msg) {
    assertEquals(messages[logCount++], msg);
  }

  void test() {
    test1();
    test2();
  };

  private void test1() {
    if (false) {
      class Foo {
        @SuppressWarnings("jsni")
        public native void foo() /*-{
          @com.google.gwt.dev.shell.rewrite.client.FourthTopLevelClass::log(Ljava/lang/String;)("ANY_FOO");
        }-*/;
      }
      new Foo().foo();
    }
  }

  private void test2() {
    class Foo {
      @SuppressWarnings("jsni")
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.FourthTopLevelClass::log(Ljava/lang/String;)("4a foo");
      }-*/;
    }
    new Foo().foo();
  }

  /*
   * Added a test3() method so that when the test fails, it fails quickly.
   * Instead of timing out, the AssertEquals fails
   */
  @SuppressWarnings("unused")
  private void test3() {
    class Foo {
      @SuppressWarnings("jsni")
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.FourthTopLevelClass::log(Ljava/lang/String;)("4b foo");
      }-*/;
    }
    new Foo().foo();
  }
}

/**
 * Check if GWT is able to correctly compile cases when there are multiple
 * top-level classes and when there is a need to traverse inner classes. This
 * class's test method simply mirrors the test methods of EmmaClassLoadingTest.
 * 
 */
class SecondTopLevelClass extends TestCase {

  static class InnerClass {
    /**
     * Test that mapping is constructed for something which is not in the main
     * unit as well.
     */
    static void test() {
      EmmaClassLoadingTest.TestInterface a = new EmmaClassLoadingTest.TestInterface() {
        public void foo() {
          log("2a foo");
        }
      };
      a.foo();

      EmmaClassLoadingTest.TestInterface b = new EmmaClassLoadingTest.TestInterface() {
        @SuppressWarnings("jsni")
        public native void foo() /*-{
          @com.google.gwt.dev.shell.rewrite.client.SecondTopLevelClass::log(Ljava/lang/String;)("2b foo");
        }-*/;
      };
      b.foo();

      if (false) {
        EmmaClassLoadingTest.TestInterface c = new EmmaClassLoadingTest.TestInterface() {
          @SuppressWarnings("jsni")
          public native void foo() /*-{
            @com.google.gwt.dev.shell.rewrite.client.SecondTopLevelClass::log(Ljava/lang/String;)("ANY_FOO_1");
          }-*/;
        };
      }
      EmmaClassLoadingTest.EnumClass et = EmmaClassLoadingTest.EnumClass.A;
      switch (et) {
        case A:
          log("2enum A");
          break;
        case B:
          log("ANY_FOO_2");
          break;
        case C:
          log("ANY_FOO_3");
          break;
      }

      EmmaClassLoadingTest.TestInterface d = new EmmaClassLoadingTest.TestInterface() {
        @SuppressWarnings("jsni")
        public native void foo() /*-{
          @com.google.gwt.dev.shell.rewrite.client.SecondTopLevelClass::log(Ljava/lang/String;)("2d foo");
        }-*/;
      };
      d.foo();

      /*
       * jdt generates $1 (a), $2 (b), $3 (d), $4 (e). javac generates $1 (a),
       * $2 (b), $3 (c), $4 (d), $5 (e), $6 (synthetic). Added e so that the
       * test fails quickly. Otherwise, it had to wait for a time-out (in
       * looking through jdt generated code for non-existent jsni methods of $4)
       * to fail.
       */
      EmmaClassLoadingTest.TestInterface e = new EmmaClassLoadingTest.TestInterface() {
        @SuppressWarnings("jsni")
        public native void foo() /*-{
          @com.google.gwt.dev.shell.rewrite.client.SecondTopLevelClass::log(Ljava/lang/String;)("2e foo");
        }-*/;
      };
      e.foo();
    }
  }

  private static String messages[] = {
      "2a foo", "2b foo", "2enum A", "2d foo", "2e foo"};

  private static int logCount = 0;

  private static void log(String msg) {
    assertEquals(messages[logCount++], msg);
  }
}

/**
 * Check that the mapping algorithm is not confused by the presence of other
 * inner classes.
 */
class ThirdTopLevelClass extends TestCase {

  private static String messages[] = {"3a foo"};

  private static int logCount = 0;

  @SuppressWarnings("unused") // called by JSNI
  private static void log(String msg) {
    assertEquals(messages[logCount++], msg);
  }

  void test() {
    EmmaClassLoadingTest.TestInterface a = new EmmaClassLoadingTest.TestInterface() {
      @SuppressWarnings("jsni")
      public native void foo() /*-{
        @com.google.gwt.dev.shell.rewrite.client.ThirdTopLevelClass::log(Ljava/lang/String;)("3a foo");
      }-*/;
    };
    a.foo();
  }
}