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.ECMAErrors.typeError;
29 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;
30
31 import jdk.internal.dynalink.CallSiteDescriptor;
32 import jdk.internal.dynalink.beans.StaticClass;
33 import jdk.internal.dynalink.linker.GuardedInvocation;
34 import jdk.internal.dynalink.linker.LinkRequest;
35 import jdk.nashorn.internal.objects.annotations.Attribute;
36 import jdk.nashorn.internal.objects.annotations.Constructor;
37 import jdk.nashorn.internal.objects.annotations.Function;
38 import jdk.nashorn.internal.objects.annotations.ScriptClass;
39 import jdk.nashorn.internal.runtime.Context;
40 import jdk.nashorn.internal.runtime.JSType;
41 import jdk.nashorn.internal.runtime.NativeJavaPackage;
42 import jdk.nashorn.internal.runtime.PropertyMap;
43 import jdk.nashorn.internal.runtime.ScriptObject;
44 import jdk.nashorn.internal.runtime.ScriptRuntime;
45 import jdk.nashorn.internal.runtime.UnwarrantedOptimismException;
46
47 /**
48 * This is "JavaImporter" constructor. This constructor allows you to use Java types omitting explicit package names.
49 * Objects of this constructor are used along with {@code "with"} statements and as such are not usable in ECMAScript
50 * strict mode. Example:
51 * <pre>
52 * var imports = new JavaImporter(java.util, java.io);
53 * with (imports) {
54 * var m = new HashMap(); // java.util.HashMap
55 * var f = new File("."); // java.io.File
56 * ...
57 * }
58 * </pre>
59 * Note however that the preferred way for accessing Java types in Nashorn is through the use of
60 * {@link NativeJava#type(Object, Object) Java.type()} method.
61 */
62 @ScriptClass("JavaImporter")
63 public final class NativeJavaImporter extends ScriptObject {
64 private final Object[] args;
65
66 // initialized by nasgen
67 private static PropertyMap $nasgenmap$;
68
69 private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) {
70 super(proto, map);
71 this.args = args;
72 }
73
74 private NativeJavaImporter(final Object[] args, final Global global) {
75 this(args, global.getJavaImporterPrototype(), $nasgenmap$);
76 }
77
78 private NativeJavaImporter(final Object[] args) {
79 this(args, Global.instance());
80 }
81
82 @Override
83 public String getClassName() {
84 return "JavaImporter";
85 }
86
87 /**
88 * Constructor
89 * @param isNew is the new operator used for instantiating this NativeJavaImporter
90 * @param self self reference
91 * @param args arguments
92 * @return NativeJavaImporter instance
93 */
94 @Constructor(arity = 1)
95 public static NativeJavaImporter constructor(final boolean isNew, final Object self, final Object... args) {
96 return new NativeJavaImporter(args);
97 }
98
99 /**
100 * "No such property" handler.
101 *
102 * @param self self reference
103 * @param name property name
104 * @return value of the missing property
105 */
106 @Function(attributes = Attribute.NOT_ENUMERABLE)
107 public static Object __noSuchProperty__(final Object self, final Object name) {
108 if (! (self instanceof NativeJavaImporter)) {
109 throw typeError("not.a.java.importer", ScriptRuntime.safeToString(self));
110 }
111 return ((NativeJavaImporter)self).createProperty(JSType.toString(name));
112 }
113
114 /**
115 * "No such method call" handler
116 *
117 * @param self self reference
118 * @param args arguments to method
119 * @return never returns always throw TypeError
120 */
121 @Function(attributes = Attribute.NOT_ENUMERABLE)
122 public static Object __noSuchMethod__(final Object self, final Object... args) {
123 throw typeError("not.a.function", ScriptRuntime.safeToString(args[0]));
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 boolean isScope, 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 }