1 /*
   2  * Copyright (c) 2010, 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 
  26 package jdk.nashorn.internal.objects;
  27 
  28 import jdk.dynalink.beans.StaticClass;
  29 import jdk.nashorn.internal.objects.annotations.Constructor;
  30 import jdk.nashorn.internal.objects.annotations.ScriptClass;
  31 import jdk.nashorn.internal.runtime.Context;
  32 import jdk.nashorn.internal.runtime.FindProperty;
  33 import jdk.nashorn.internal.runtime.NativeJavaPackage;
  34 import jdk.nashorn.internal.runtime.PropertyMap;
  35 import jdk.nashorn.internal.runtime.ScriptObject;
  36 
  37 /**
  38  * This is "JavaImporter" constructor. This constructor allows you to use Java types omitting explicit package names.
  39  * Objects of this constructor are used along with {@code "with"} statements and as such are not usable in ECMAScript
  40  * strict mode. Example:
  41  * <pre>
  42  *     var imports = new JavaImporter(java.util, java.io);
  43  *     with (imports) {
  44  *         var m = new HashMap(); // java.util.HashMap
  45  *         var f = new File("."); // java.io.File
  46  *         ...
  47  *     }
  48  * </pre>
  49  * Note however that the preferred way for accessing Java types in Nashorn is through the use of
  50  * {@link NativeJava#type(Object, Object) Java.type()} method.
  51  */
  52 @ScriptClass("JavaImporter")
  53 public final class NativeJavaImporter extends ScriptObject {
  54     private final Object[] args;
  55 
  56     // initialized by nasgen
  57     private static PropertyMap $nasgenmap$;
  58 
  59     private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) {
  60         super(proto, map);
  61         this.args = args;
  62     }
  63 
  64     private NativeJavaImporter(final Object[] args, final Global global) {
  65         this(args, global.getJavaImporterPrototype(), $nasgenmap$);
  66     }
  67 
  68     private NativeJavaImporter(final Object[] args) {
  69         this(args, Global.instance());
  70     }
  71 
  72     @Override
  73     public String getClassName() {
  74         return "JavaImporter";
  75     }
  76 
  77     /**
  78      * Constructor
  79      * @param isNew is the new operator used for instantiating this NativeJavaImporter
  80      * @param self self reference
  81      * @param args arguments
  82      * @return NativeJavaImporter instance
  83      */
  84     @Constructor(arity = 1)
  85     public static NativeJavaImporter constructor(final boolean isNew, final Object self, final Object... args) {
  86         return new NativeJavaImporter(args);
  87     }
  88 
  89     @Override
  90     protected FindProperty findProperty(final Object key, final boolean deep, final boolean isScope, final ScriptObject start) {
  91         final FindProperty find = super.findProperty(key, deep, isScope, start);
  92         if (find == null && key instanceof String) {
  93             final String name = (String) key;
  94             final Object value = createProperty(name);
  95             if(value != null) {
  96                 // We must avoid calling findProperty recursively, so we pass null as first argument
  97                 setObject(null, 0, key, value);
  98                 return super.findProperty(key, deep, isScope, start);
  99             }
 100         }
 101         return find;
 102     }
 103 
 104     private Object createProperty(final String name) {
 105         final int len = args.length;
 106 
 107         for (int i = len - 1; i > -1; i--) {
 108             final Object obj = args[i];
 109 
 110             if (obj instanceof StaticClass) {
 111                 if (((StaticClass)obj).getRepresentedClass().getSimpleName().equals(name)) {
 112                     return obj;
 113                 }
 114             } else if (obj instanceof NativeJavaPackage) {
 115                 final String pkgName  = ((NativeJavaPackage)obj).getName();
 116                 final String fullName = pkgName.isEmpty() ? name : (pkgName + "." + name);
 117                 final Context context = Global.instance().getContext();
 118                 try {
 119                     return StaticClass.forClass(context.findClass(fullName));
 120                 } catch (final ClassNotFoundException e) {
 121                     // IGNORE
 122                 }
 123             }
 124         }
 125         return null;
 126     }
 127 }