DescriptorFinder now can find class names in a package

This helps to get rid of "repeated class_name" field in Package protobuf
message. DescriptorFinder in resolve.java uses PSI to find all classes in a
package, and the finder for built-ins just reads .kotlin_class_names file

compiler/tests/org/jetbrains/jet/codegen/KotlinClassAnnotationTest.java

@@ -32,8 +32,10 @@ import org.jetbrains.jet.lang.descriptors.impl.NamespaceDescriptorImpl;
 import org.jetbrains.jet.lang.resolve.lazy.storage.LockBasedStorageManager;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.FqNameUnsafe;
+import org.jetbrains.jet.lang.resolve.name.Name;
 
 import java.io.IOException;
+import java.util.Collection;
 
 public class KotlinClassAnnotationTest extends CodegenTestCase {
     public static final FqName NAMESPACE_NAME = new FqName("test");
@@ -90,6 +92,12 @@ public class KotlinClassAnnotationTest extends CodegenTestCase {
             return namespace;
         }
 
+        @NotNull
+        @Override
+        public Collection<Name> getClassNames(@NotNull FqName packageName) {
+            throw new UnsupportedOperationException();
+        }
+
         @Override
         protected void classDescriptorCreated(@NotNull ClassDescriptor classDescriptor) {
         }

compiler/tests/org/jetbrains/jet/codegen/KotlinPackageAnnotationTest.java

@@ -55,9 +55,6 @@ public class KotlinPackageAnnotationTest extends CodegenTestCase {
 
         PackageData data = JavaProtoBufUtil.readPackageDataFrom(kotlinPackage.data());
 
-        Set<String> classNames = collectClassNames(data);
-        assertSameElements(Arrays.asList("A", "B", "C"), classNames);
-
         Set<String> callableNames = collectCallableNames(data);
         assertSameElements(Arrays.asList("foo", "bar", "C"), callableNames);
     }
@@ -71,13 +68,4 @@ public class KotlinPackageAnnotationTest extends CodegenTestCase {
         }
         return callableNames;
     }
-
-    @NotNull
-    private static Set<String> collectClassNames(@NotNull PackageData data) {
-        Set<String> classNames = new HashSet<String>();
-        for (int name : data.getPackageProto().getClassNameList()) {
-            classNames.add(data.getNameResolver().getName(name).asString());
-        }
-        return classNames;
-    }
 }

compiler/tests/org/jetbrains/jet/descriptors/serialization/AbstractDescriptorSerializationTest.java

@@ -295,6 +295,12 @@ public abstract class AbstractDescriptorSerializationTest extends KotlinTestWith
         public NamespaceDescriptor findPackage(@NotNull FqName name) {
             return null;
         }
+
+        @NotNull
+        @Override
+        public Collection<Name> getClassNames(@NotNull FqName packageName) {
+            throw new UnsupportedOperationException();
+        }
     }
 
     private static class JavaDescriptorFinder implements DescriptorFinder {
@@ -340,5 +346,11 @@ public abstract class AbstractDescriptorSerializationTest extends KotlinTestWith
         public NamespaceDescriptor findPackage(@NotNull FqName name) {
             return javaDescriptorResolver.resolveNamespace(name);
         }
+
+        @NotNull
+        @Override
+        public Collection<Name> getClassNames(@NotNull FqName packageName) {
+            throw new UnsupportedOperationException();
+        }
     }
 }

compiler/tests/org/jetbrains/jet/descriptors/serialization/BuiltinsDeserializationTest.java

@@ -32,6 +32,7 @@ import org.jetbrains.jet.lang.resolve.DescriptorUtils;
 import org.jetbrains.jet.lang.resolve.lazy.KotlinTestWithEnvironment;
 import org.jetbrains.jet.lang.resolve.lazy.storage.LockBasedStorageManager;
 import org.jetbrains.jet.lang.resolve.name.FqName;
+import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.WritableScope;
 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
 import org.jetbrains.jet.renderer.DescriptorRenderer;
@@ -75,8 +76,7 @@ public class BuiltinsDeserializationTest extends KotlinTestWithEnvironment {
 
         List<ProtoBuf.Callable> callableProtos = serializeCallables(serializer, allDescriptors);
 
-        final NamespaceDescriptorImpl actualNamespace = JetTestUtils
-                .createTestNamespace(KotlinBuiltIns.BUILT_INS_PACKAGE_FQ_NAME.shortName());
+        final NamespaceDescriptorImpl actualNamespace = JetTestUtils.createTestNamespace(KotlinBuiltIns.BUILT_INS_PACKAGE_NAME);
 
         final NameResolver nameResolver = NameSerializationUtil.createNameResolver(serializer.getNameTable());
 
@@ -88,6 +88,12 @@ public class BuiltinsDeserializationTest extends KotlinTestWithEnvironment {
                 return actualNamespace;
             }
 
+            @NotNull
+            @Override
+            public Collection<Name> getClassNames(@NotNull FqName packageName) {
+                throw new UnsupportedOperationException();
+            }
+
             @Nullable
             @Override
             protected ClassData getClassData(@NotNull ClassId classId) {