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