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 static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;
  29 
  30 import jdk.internal.dynalink.CallSiteDescriptor;
  31 import jdk.internal.dynalink.beans.StaticClass;
  32 import jdk.internal.dynalink.linker.GuardedInvocation;
  33 import jdk.internal.dynalink.linker.LinkRequest;
  34 import jdk.nashorn.internal.objects.annotations.Attribute;
  35 import jdk.nashorn.internal.objects.annotations.Constructor;
  36 import jdk.nashorn.internal.objects.annotations.Function;
  37 import jdk.nashorn.internal.objects.annotations.ScriptClass;
  38 import jdk.nashorn.internal.runtime.Context;
  39 import jdk.nashorn.internal.runtime.NativeJavaPackage;
  40 import jdk.nashorn.internal.runtime.PropertyMap;
  41 import jdk.nashorn.internal.runtime.ScriptObject;
  42 import jdk.nashorn.internal.runtime.UnwarrantedOptimismException;
  43 
  44 /**
  45  * This is "JavaImporter" constructor. This constructor allows you to use Java types omitting explicit package names.
  46  * Objects of this constructor are used along with {@code "with"} statements and as such are not usable in ECMAScript
  47  * strict mode. Example:
  48  * <pre>
  49  *     var imports = new JavaImporter(java.util, java.io);
  50  *     with (imports) {
  51  *         var m = new HashMap(); // java.util.HashMap
  52  *         var f = new File("."); // java.io.File
  53  *         ...
  54  *     }
  55  * </pre>
  56  * Note however that the preferred way for accessing Java types in Nashorn is through the use of
  57  * {@link NativeJava#type(Object, Object) Java.type()} method.
  58  */
  59 @ScriptClass("JavaImporter")
  60 public final class NativeJavaImporter extends ScriptObject {
  61     private final Object[] args;
  62 
  63     // initialized by nasgen
  64     private static PropertyMap $nasgenmap$;
  65 
  66     private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) {
  67         super(proto, map);
  68         this.args = args;
  69     }
  70 
  71     private NativeJavaImporter(final Object[] args, final Global global) {
  72         this(args, global.getJavaImporterPrototype(), $nasgenmap$);
  73     }
  74 
  75     private NativeJavaImporter(final Object[] args) {
  76         this(args, Global.instance());
  77     }
  78 
  79     @Override
  80     public String getClassName() {
  81         return "JavaImporter";
  82     }
  83 
  84     /**
  85      * Constructor
  86      * @param isNew is the new operator used for instantiating this NativeJavaImporter
  87      * @param self self reference
  88      * @param args arguments
  89      * @return NativeJavaImporter instance
  90      */
  91     @Constructor(arity = 1)
  92     public static NativeJavaImporter constructor(final boolean isNew, final Object self, final Object... args) {
  93         return new NativeJavaImporter(args);
  94     }
  95 
  96     /**
  97      * "No such property" call placeholder.
  98      *
  99      * This can never be called as we override {@link ScriptObject#noSuchProperty}. We do declare it here as it's a signal
 100      * to {@link jdk.nashorn.internal.runtime.WithObject} that it's worth trying doing a {@code noSuchProperty} on this object.
 101      *
 102      * @param self self reference
 103      * @param name property name
 104      * @return never returns
 105      */
 106     @Function(attributes = Attribute.NOT_ENUMERABLE)
 107     public static Object __noSuchProperty__(final Object self, final Object name) {
 108         throw new AssertionError("__noSuchProperty__ placeholder called");
 109     }
 110 
 111     /**
 112      * "No such method call" placeholder
 113      *
 114      * This can never be called as we override {@link ScriptObject#noSuchMethod}. We do declare it here as it's a signal
 115      * to {@link jdk.nashorn.internal.runtime.WithObject} that it's worth trying doing a noSuchProperty on this object.
 116      *
 117      * @param self self reference
 118      * @param args arguments to method
 119      * @return never returns
 120      */
 121     @Function(attributes = Attribute.NOT_ENUMERABLE)
 122     public static Object __noSuchMethod__(final Object self, final Object... args) {
 123         throw new AssertionError("__noSuchMethod__ placeholder called");
 124     }
 125 
 126     @Override
 127     public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) {
 128         return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchProperty(desc, request);
 129     }
 130 
 131     @Override
 132     public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
 133         return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchMethod(desc, request);
 134     }
 135 
 136     @Override
 137     protected Object invokeNoSuchProperty(final String name, final int programPoint) {
 138         final Object retval = createProperty(name);
 139         if (isValid(programPoint)) {
 140             throw new UnwarrantedOptimismException(retval, programPoint);
 141         }
 142         return retval;
 143     }
 144 
 145     private boolean createAndSetProperty(final CallSiteDescriptor desc) {
 146         final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
 147         final Object value = createProperty(name);
 148         if(value != null) {
 149             set(name, value, 0);
 150             return true;
 151         }
 152         return false;
 153     }
 154 
 155     private Object createProperty(final String name) {
 156         final int len = args.length;
 157 
 158         for (int i = len - 1; i > -1; i--) {
 159             final Object obj = args[i];
 160 
 161             if (obj instanceof StaticClass) {
 162                 if (((StaticClass)obj).getRepresentedClass().getSimpleName().equals(name)) {
 163                     return obj;
 164                 }
 165             } else if (obj instanceof NativeJavaPackage) {
 166                 final String pkgName  = ((NativeJavaPackage)obj).getName();
 167                 final String fullName = pkgName.isEmpty() ? name : (pkgName + "." + name);
 168                 final Context context = Global.instance().getContext();
 169                 try {
 170                     return StaticClass.forClass(context.findClass(fullName));
 171                 } catch (final ClassNotFoundException e) {
 172                     // IGNORE
 173                 }
 174             }
 175         }
 176         return null;
 177     }
 178 }