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 static PropertyMap getInitialMap() { 64 return $nasgenmap$; 65 } 66 67 private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) { 68 super(proto, map); 69 this.args = args; 70 } 71 72 private NativeJavaImporter(final Object[] args, final Global global) { 73 this(args, global.getJavaImporterPrototype(), getInitialMap()); 74 } 75 76 private NativeJavaImporter(final Object[] args) { 77 this(args, Global.instance()); 78 } 79 80 @Override 81 public String getClassName() { 82 return "JavaImporter"; 83 } 84 85 /** 86 * Constructor 87 * @param isNew is the new operator used for instantiating this NativeJavaImporter 88 * @param self self reference 89 * @param args arguments 90 * @return NativeJavaImporter instance 91 */ 92 @Constructor(arity = 1) 93 public static Object constructor(final boolean isNew, final Object self, final Object... args) { 94 return new NativeJavaImporter(args); 95 } 96 97 /** 98 * "No such property" call placeholder. 99 * 100 * This can never be called as we override {@link ScriptObject#noSuchProperty}. We do declare it here as it's a signal 101 * to {@link jdk.nashorn.internal.runtime.WithObject} that it's worth trying doing a {@code noSuchProperty} on this object. 102 * 103 * @param self self reference 104 * @param name property name 105 * @return never returns 106 */ 107 @Function(attributes = Attribute.NOT_ENUMERABLE) 108 public static Object __noSuchProperty__(final Object self, final Object name) { 109 throw new AssertionError("__noSuchProperty__ placeholder called"); 110 } 111 112 /** 113 * "No such method call" placeholder 114 * 115 * This can never be called as we override {@link ScriptObject#noSuchMethod}. We do declare it here as it's a signal 116 * to {@link jdk.nashorn.internal.runtime.WithObject} that it's worth trying doing a noSuchProperty on this object. 117 * 118 * @param self self reference 119 * @param args arguments to method 120 * @return never returns 121 */ 122 @Function(attributes = Attribute.NOT_ENUMERABLE) 123 public static Object __noSuchMethod__(final Object self, final Object... args) { 124 throw new AssertionError("__noSuchMethod__ placeholder called"); 125 } 126 127 @Override 128 public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) { 129 return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchProperty(desc, request); 130 } 131 132 @Override 133 public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) { 134 return createAndSetProperty(desc) ? super.lookup(desc, request) : super.noSuchMethod(desc, request); 135 } 136 137 @Override 138 protected Object invokeNoSuchProperty(final String name) { 139 return createProperty(name); 140 } 141 142 private boolean createAndSetProperty(final CallSiteDescriptor desc) { 143 final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); 144 final Object value = createProperty(name); 145 if(value != null) { 146 set(name, value, false); 147 return true; 148 } 149 return false; 150 } 151 152 private Object createProperty(final String name) { 153 final int len = args.length; 154 155 for (int i = len - 1; i > -1; i--) { 156 final Object obj = args[i]; 157 158 if (obj instanceof StaticClass) { 159 if (((StaticClass)obj).getRepresentedClass().getSimpleName().equals(name)) { 160 return obj; 161 } 162 } else if (obj instanceof NativeJavaPackage) { 163 final String pkgName = ((NativeJavaPackage)obj).getName(); 164 final String fullName = pkgName.isEmpty() ? name : (pkgName + "." + name); 165 final Context context = Global.instance().getContext(); 166 try { 167 return StaticClass.forClass(context.findClass(fullName)); 168 } catch (final ClassNotFoundException e) { 169 // IGNORE 170 } 171 } 172 } 173 return null; 174 } 175 }