1 /*
   2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package com.apple.jobjc;
  26 
  27 import java.lang.ref.WeakReference;
  28 import java.lang.reflect.Constructor;
  29 
  30 
  31 public class NSClass<T extends ID> extends ID {
  32     public static class NSClassNotFoundException extends RuntimeException{
  33         public NSClassNotFoundException(String m){ super(m); }
  34         public NSClassNotFoundException(String m, Throwable cause){ super(m, cause); }
  35     }
  36 
  37     static native long getNativeClassByName(String name);
  38     static native long getSuperClassOfClass(long classPtr);
  39     static native String getClassNameOfClass(long classPtr);
  40     static native long getClass(long objPtr);
  41 
  42     public NSClass(final long ptr, final JObjCRuntime runtime) {
  43         super(ptr, runtime);
  44     }
  45 
  46     public NSClass(final String name, final JObjCRuntime runtime) {
  47         this(getNativeClassByName(name), runtime);
  48         if(ptr == 0) throw new NSClassNotFoundException("NSClass pointer is 0. Found no class named " + name);
  49     }
  50 
  51     protected NSClass(final JObjCRuntime runtime){
  52         super(0, runtime);
  53         final String sn = getClass().getSimpleName();
  54         final String name = sn.substring(0, sn.lastIndexOf("Class"));
  55         ptr = getNativeClassByName(name);
  56         if(ptr == 0) throw new NSClassNotFoundException("NSClass pointer is 0. Found no class named " + name);
  57     }
  58 
  59     NSClass<? super T> getSuperClass() {
  60         return new NSClass<T>(getSuperClassOfClass(ptr), runtime);
  61     }
  62 
  63     String getClassName() { return getClassNameOfClass(ptr); }
  64 
  65     @Override protected NativeObjectLifecycleManager getNativeObjectLifecycleManager() {
  66         return NativeObjectLifecycleManager.Nothing.INST;
  67     }
  68 
  69     @Override public boolean equals(Object o){
  70         return (o instanceof NSClass) && (this.ptr == ((NSClass) o).ptr);
  71     }
  72 
  73     //
  74 
  75     static <T extends NSClass> T getObjCClassFor(final JObjCRuntime runtime, final long clsPtr){
  76         if (clsPtr == 0) return null;
  77 
  78         final WeakReference cachedObj = objectCache.get().get(clsPtr);
  79         if(cachedObj != null && cachedObj.get() != null) return (T) cachedObj.get();
  80 
  81         final T newObj = (T) createNewObjCClassFor(runtime, clsPtr);
  82         objectCache.get().put(clsPtr, new WeakReference(newObj));
  83         return newObj;
  84     }
  85 
  86     static <T extends NSClass> T createNewObjCClassFor(final JObjCRuntime runtime, final long clsPtr) {
  87         final Constructor<T> ctor = getNSClassConstructorForClassPtr(runtime, clsPtr);
  88         return (T) createNewObjCObjectForConstructor(ctor, clsPtr, runtime);
  89     }
  90 
  91     @SuppressWarnings("unchecked")
  92     static <T extends NSClass> Constructor<T> getNSClassConstructorForClassPtr(final JObjCRuntime runtime, final long clazzPtr){
  93         final Class<T> clazz = getNSClassForClassPtr(runtime, clazzPtr);
  94         Constructor<T> ctor;
  95         try {
  96             ctor = clazz.getDeclaredConstructor(CTOR_ARGS);
  97         } catch (SecurityException e) {
  98             throw new RuntimeException(e);
  99         } catch (NoSuchMethodException e) {
 100             throw new RuntimeException(e);
 101         }
 102         ctor.setAccessible(true);
 103         return ctor;
 104     }
 105 
 106     @SuppressWarnings("unchecked")
 107     static <T extends ID> Class<T> getNSClassForClassPtr(final JObjCRuntime runtime, final long clazzPtr){
 108         final String className = NSClass.getClassNameOfClass(clazzPtr);
 109         final Class<T> clazz = (Class<T>) runtime.getClassForNativeClassName(className + "Class");
 110         if(clazz == null){
 111             final long superClazzPtr = NSClass.getSuperClassOfClass(clazzPtr);
 112             if(superClazzPtr != 0)
 113                 return getNSClassForClassPtr(runtime, superClazzPtr);
 114         }
 115         return clazz;
 116     }
 117 }