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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2006, 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 com.sun.script.javascript; | ||
| 27 | import sun.org.mozilla.javascript.internal.*; | ||
| 28 | import javax.script.*; | ||
| 29 | import java.util.*; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * ExternalScriptable is an implementation of Scriptable | ||
| 33 | * backed by a JSR 223 ScriptContext instance. | ||
| 34 | * | ||
| 35 | * @author Mike Grogan | ||
| 36 | * @author A. Sundararajan | ||
| 37 | * @since 1.6 | ||
| 38 | */ | ||
| 39 | |||
| 40 | final class ExternalScriptable implements Scriptable { | ||
| 41 | /* Underlying ScriptContext that we use to store | ||
| 42 | * named variables of this scope. | ||
| 43 | */ | ||
| 44 | private ScriptContext context; | ||
| 45 | |||
| 46 | /* JavaScript allows variables to be named as numbers (indexed | ||
| 47 | * properties). This way arrays, objects (scopes) are treated uniformly. | ||
| 48 | * Note that JSR 223 API supports only String named variables and | ||
| 49 | * so we can't store these in Bindings. Also, JavaScript allows name | ||
| 50 | * of the property name to be even empty String! Again, JSR 223 API | ||
| 51 | * does not support empty name. So, we use the following fallback map | ||
| 52 | * to store such variables of this scope. This map is not exposed to | ||
| 53 | * JSR 223 API. We can just script objects "as is" and need not convert. | ||
| 54 | */ | ||
| 55 | private Map<Object, Object> indexedProps; | ||
| 56 | |||
| 57 | // my prototype | ||
| 58 | private Scriptable prototype; | ||
| 59 | // my parent scope, if any | ||
| 60 | private Scriptable parent; | ||
| 61 | |||
| 62 | ExternalScriptable(ScriptContext context) { | ||
| 63 | this(context, new HashMap<Object, Object>()); | ||
| 64 | } | ||
| 65 | |||
| 66 | ExternalScriptable(ScriptContext context, Map<Object, Object> indexedProps) { | ||
| 67 | if (context == null) { | ||
| 68 | throw new NullPointerException("context is null"); | ||
| 69 | } | ||
| 70 | this.context = context; | ||
| 71 | this.indexedProps = indexedProps; | ||
| 72 | } | ||
| 73 | |||
| 74 | ScriptContext getContext() { | ||
| 75 | return context; | ||
| 76 | } | ||
| 77 | |||
| 78 | private boolean isEmpty(String name) { | ||
| 79 | return name.equals(""); | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Return the name of the class. | ||
| 84 | */ | ||
| 85 | public String getClassName() { | ||
| 86 | return "Global"; | ||
| 87 | } | ||
| 88 | |||
| 89 | /** | ||
| 90 | * Returns the value of the named property or NOT_FOUND. | ||
| 91 | * | ||
| 92 | * If the property was created using defineProperty, the | ||
| 93 | * appropriate getter method is called. | ||
| 94 | * | ||
| 95 | * @param name the name of the property | ||
| 96 | * @param start the object in which the lookup began | ||
| 97 | * @return the value of the property (may be null), or NOT_FOUND | ||
| 98 | */ | ||
| 99 | public synchronized Object get(String name, Scriptable start) { | ||
| 100 | if (isEmpty(name)) { | ||
| 101 | if (indexedProps.containsKey(name)) { | ||
| 102 | return indexedProps.get(name); | ||
| 103 | } else { | ||
| 104 | return NOT_FOUND; | ||
| 105 | } | ||
| 106 | } else { | ||
| 107 | synchronized (context) { | ||
| 108 | int scope = context.getAttributesScope(name); | ||
| 109 | if (scope != -1) { | ||
| 110 | Object value = context.getAttribute(name, scope); | ||
| 111 | return Context.javaToJS(value, this); | ||
| 112 | } else { | ||
| 113 | return NOT_FOUND; | ||
| 114 | } | ||
| 115 | } | ||
| 116 | } | ||
| 117 | } | ||
| 118 | |||
| 119 | /** | ||
| 120 | * Returns the value of the indexed property or NOT_FOUND. | ||
| 121 | * | ||
| 122 | * @param index the numeric index for the property | ||
| 123 | * @param start the object in which the lookup began | ||
| 124 | * @return the value of the property (may be null), or NOT_FOUND | ||
| 125 | */ | ||
| 126 | public synchronized Object get(int index, Scriptable start) { | ||
| 127 | Integer key = new Integer(index); | ||
| 128 | if (indexedProps.containsKey(index)) { | ||
| 129 | return indexedProps.get(key); | ||
| 130 | } else { | ||
| 131 | return NOT_FOUND; | ||
| 132 | } | ||
| 133 | } | ||
| 134 | |||
| 135 | /** | ||
| 136 | * Returns true if the named property is defined. | ||
| 137 | * | ||
| 138 | * @param name the name of the property | ||
| 139 | * @param start the object in which the lookup began | ||
| 140 | * @return true if and only if the property was found in the object | ||
| 141 | */ | ||
| 142 | public synchronized boolean has(String name, Scriptable start) { | ||
| 143 | if (isEmpty(name)) { | ||
| 144 | return indexedProps.containsKey(name); | ||
| 145 | } else { | ||
| 146 | synchronized (context) { | ||
| 147 | return context.getAttributesScope(name) != -1; | ||
| 148 | } | ||
| 149 | } | ||
| 150 | } | ||
| 151 | |||
| 152 | /** | ||
| 153 | * Returns true if the property index is defined. | ||
| 154 | * | ||
| 155 | * @param index the numeric index for the property | ||
| 156 | * @param start the object in which the lookup began | ||
| 157 | * @return true if and only if the property was found in the object | ||
| 158 | */ | ||
| 159 | public synchronized boolean has(int index, Scriptable start) { | ||
| 160 | Integer key = new Integer(index); | ||
| 161 | return indexedProps.containsKey(key); | ||
| 162 | } | ||
| 163 | |||
| 164 | /** | ||
| 165 | * Sets the value of the named property, creating it if need be. | ||
| 166 | * | ||
| 167 | * @param name the name of the property | ||
| 168 | * @param start the object whose property is being set | ||
| 169 | * @param value value to set the property to | ||
| 170 | */ | ||
| 171 | public void put(String name, Scriptable start, Object value) { | ||
| 172 | if (start == this) { | ||
| 173 | synchronized (this) { | ||
| 174 | if (isEmpty(name)) { | ||
| 175 | indexedProps.put(name, value); | ||
| 176 | } else { | ||
| 177 | synchronized (context) { | ||
| 178 | int scope = context.getAttributesScope(name); | ||
| 179 | if (scope == -1) { | ||
| 180 | scope = ScriptContext.ENGINE_SCOPE; | ||
| 181 | } | ||
| 182 | context.setAttribute(name, jsToJava(value), scope); | ||
| 183 | } | ||
| 184 | } | ||
| 185 | } | ||
| 186 | } else { | ||
| 187 | start.put(name, start, value); | ||
| 188 | } | ||
| 189 | } | ||
| 190 | |||
| 191 | /** | ||
| 192 | * Sets the value of the indexed property, creating it if need be. | ||
| 193 | * | ||
| 194 | * @param index the numeric index for the property | ||
| 195 | * @param start the object whose property is being set | ||
| 196 | * @param value value to set the property to | ||
| 197 | */ | ||
| 198 | public void put(int index, Scriptable start, Object value) { | ||
| 199 | if (start == this) { | ||
| 200 | synchronized (this) { | ||
| 201 | indexedProps.put(new Integer(index), value); | ||
| 202 | } | ||
| 203 | } else { | ||
| 204 | start.put(index, start, value); | ||
| 205 | } | ||
| 206 | } | ||
| 207 | |||
| 208 | /** | ||
| 209 | * Removes a named property from the object. | ||
| 210 | * | ||
| 211 | * If the property is not found, no action is taken. | ||
| 212 | * | ||
| 213 | * @param name the name of the property | ||
| 214 | */ | ||
| 215 | public synchronized void delete(String name) { | ||
| 216 | if (isEmpty(name)) { | ||
| 217 | indexedProps.remove(name); | ||
| 218 | } else { | ||
| 219 | synchronized (context) { | ||
| 220 | int scope = context.getAttributesScope(name); | ||
| 221 | if (scope != -1) { | ||
| 222 | context.removeAttribute(name, scope); | ||
| 223 | } | ||
| 224 | } | ||
| 225 | } | ||
| 226 | } | ||
| 227 | |||
| 228 | /** | ||
| 229 | * Removes the indexed property from the object. | ||
| 230 | * | ||
| 231 | * If the property is not found, no action is taken. | ||
| 232 | * | ||
| 233 | * @param index the numeric index for the property | ||
| 234 | */ | ||
| 235 | public void delete(int index) { | ||
| 236 | indexedProps.remove(new Integer(index)); | ||
| 237 | } | ||
| 238 | |||
| 239 | /** | ||
| 240 | * Get the prototype of the object. | ||
| 241 | * @return the prototype | ||
| 242 | */ | ||
| 243 | public Scriptable getPrototype() { | ||
| 244 | return prototype; | ||
| 245 | } | ||
| 246 | |||
| 247 | /** | ||
| 248 | * Set the prototype of the object. | ||
| 249 | * @param prototype the prototype to set | ||
| 250 | */ | ||
| 251 | public void setPrototype(Scriptable prototype) { | ||
| 252 | this.prototype = prototype; | ||
| 253 | } | ||
| 254 | |||
| 255 | /** | ||
| 256 | * Get the parent scope of the object. | ||
| 257 | * @return the parent scope | ||
| 258 | */ | ||
| 259 | public Scriptable getParentScope() { | ||
| 260 | return parent; | ||
| 261 | } | ||
| 262 | |||
| 263 | /** | ||
| 264 | * Set the parent scope of the object. | ||
| 265 | * @param parent the parent scope to set | ||
| 266 | */ | ||
| 267 | public void setParentScope(Scriptable parent) { | ||
| 268 | this.parent = parent; | ||
| 269 | } | ||
| 270 | |||
| 271 | /** | ||
| 272 | * Get an array of property ids. | ||
| 273 | * | ||
| 274 | * Not all property ids need be returned. Those properties | ||
| 275 | * whose ids are not returned are considered non-enumerable. | ||
| 276 | * | ||
| 277 | * @return an array of Objects. Each entry in the array is either | ||
| 278 | * a java.lang.String or a java.lang.Number | ||
| 279 | */ | ||
| 280 | public synchronized Object[] getIds() { | ||
| 281 | String[] keys = getAllKeys(); | ||
| 282 | int size = keys.length + indexedProps.size(); | ||
| 283 | Object[] res = new Object[size]; | ||
| 284 | System.arraycopy(keys, 0, res, 0, keys.length); | ||
| 285 | int i = keys.length; | ||
| 286 | // now add all indexed properties | ||
| 287 | for (Object index : indexedProps.keySet()) { | ||
| 288 | res[i++] = index; | ||
| 289 | } | ||
| 290 | return res; | ||
| 291 | } | ||
| 292 | |||
| 293 | /** | ||
| 294 | * Get the default value of the object with a given hint. | ||
| 295 | * The hints are String.class for type String, Number.class for type | ||
| 296 | * Number, Scriptable.class for type Object, and Boolean.class for | ||
| 297 | * type Boolean. <p> | ||
| 298 | * | ||
| 299 | * A <code>hint</code> of null means "no hint". | ||
| 300 | * | ||
| 301 | * See ECMA 8.6.2.6. | ||
| 302 | * | ||
| 303 | * @param hint the type hint | ||
| 304 | * @return the default value | ||
| 305 | */ | ||
| 306 | public Object getDefaultValue(Class typeHint) { | ||
| 307 | for (int i=0; i < 2; i++) { | ||
| 308 | boolean tryToString; | ||
| 309 | if (typeHint == ScriptRuntime.StringClass) { | ||
| 310 | tryToString = (i == 0); | ||
| 311 | } else { | ||
| 312 | tryToString = (i == 1); | ||
| 313 | } | ||
| 314 | |||
| 315 | String methodName; | ||
| 316 | Object[] args; | ||
| 317 | if (tryToString) { | ||
| 318 | methodName = "toString"; | ||
| 319 | args = ScriptRuntime.emptyArgs; | ||
| 320 | } else { | ||
| 321 | methodName = "valueOf"; | ||
| 322 | args = new Object[1]; | ||
| 323 | String hint; | ||
| 324 | if (typeHint == null) { | ||
| 325 | hint = "undefined"; | ||
| 326 | } else if (typeHint == ScriptRuntime.StringClass) { | ||
| 327 | hint = "string"; | ||
| 328 | } else if (typeHint == ScriptRuntime.ScriptableClass) { | ||
| 329 | hint = "object"; | ||
| 330 | } else if (typeHint == ScriptRuntime.FunctionClass) { | ||
| 331 | hint = "function"; | ||
| 332 | } else if (typeHint == ScriptRuntime.BooleanClass | ||
| 333 | || typeHint == Boolean.TYPE) | ||
| 334 | { | ||
| 335 | hint = "boolean"; | ||
| 336 | } else if (typeHint == ScriptRuntime.NumberClass || | ||
| 337 | typeHint == ScriptRuntime.ByteClass || | ||
| 338 | typeHint == Byte.TYPE || | ||
| 339 | typeHint == ScriptRuntime.ShortClass || | ||
| 340 | typeHint == Short.TYPE || | ||
| 341 | typeHint == ScriptRuntime.IntegerClass || | ||
| 342 | typeHint == Integer.TYPE || | ||
| 343 | typeHint == ScriptRuntime.FloatClass || | ||
| 344 | typeHint == Float.TYPE || | ||
| 345 | typeHint == ScriptRuntime.DoubleClass || | ||
| 346 | typeHint == Double.TYPE) | ||
| 347 | { | ||
| 348 | hint = "number"; | ||
| 349 | } else { | ||
| 350 | throw Context.reportRuntimeError( | ||
| 351 | "Invalid JavaScript value of type " + | ||
| 352 | typeHint.toString()); | ||
| 353 | } | ||
| 354 | args[0] = hint; | ||
| 355 | } | ||
| 356 | Object v = ScriptableObject.getProperty(this, methodName); | ||
| 357 | if (!(v instanceof Function)) | ||
| 358 | continue; | ||
| 359 | Function fun = (Function) v; | ||
| 360 | Context cx = RhinoScriptEngine.enterContext(); | ||
| 361 | try { | ||
| 362 | v = fun.call(cx, fun.getParentScope(), this, args); | ||
| 363 | } finally { | ||
| 364 | cx.exit(); | ||
| 365 | } | ||
| 366 | if (v != null) { | ||
| 367 | if (!(v instanceof Scriptable)) { | ||
| 368 | return v; | ||
| 369 | } | ||
| 370 | if (typeHint == ScriptRuntime.ScriptableClass | ||
| 371 | || typeHint == ScriptRuntime.FunctionClass) | ||
| 372 | { | ||
| 373 | return v; | ||
| 374 | } | ||
| 375 | if (tryToString && v instanceof Wrapper) { | ||
| 376 | // Let a wrapped java.lang.String pass for a primitive | ||
| 377 | // string. | ||
| 378 | Object u = ((Wrapper)v).unwrap(); | ||
| 379 | if (u instanceof String) | ||
| 380 | return u; | ||
| 381 | } | ||
| 382 | } | ||
| 383 | } | ||
| 384 | // fall through to error | ||
| 385 | String arg = (typeHint == null) ? "undefined" : typeHint.getName(); | ||
| 386 | throw Context.reportRuntimeError( | ||
| 387 | "Cannot find default value for object " + arg); | ||
| 388 | } | ||
| 389 | |||
| 390 | /** | ||
| 391 | * Implements the instanceof operator. | ||
| 392 | * | ||
| 393 | * @param instance The value that appeared on the LHS of the instanceof | ||
| 394 | * operator | ||
| 395 | * @return true if "this" appears in value's prototype chain | ||
| 396 | * | ||
| 397 | */ | ||
| 398 | public boolean hasInstance(Scriptable instance) { | ||
| 399 | // Default for JS objects (other than Function) is to do prototype | ||
| 400 | // chasing. | ||
| 401 | Scriptable proto = instance.getPrototype(); | ||
| 402 | while (proto != null) { | ||
| 403 | if (proto.equals(this)) return true; | ||
| 404 | proto = proto.getPrototype(); | ||
| 405 | } | ||
| 406 | return false; | ||
| 407 | } | ||
| 408 | |||
| 409 | private String[] getAllKeys() { | ||
| 410 | ArrayList<String> list = new ArrayList<String>(); | ||
| 411 | synchronized (context) { | ||
| 412 | for (int scope : context.getScopes()) { | ||
| 413 | Bindings bindings = context.getBindings(scope); | ||
| 414 | if (bindings != null) { | ||
| 415 | list.ensureCapacity(bindings.size()); | ||
| 416 | for (String key : bindings.keySet()) { | ||
| 417 | list.add(key); | ||
| 418 | } | ||
| 419 | } | ||
| 420 | } | ||
| 421 | } | ||
| 422 | String[] res = new String[list.size()]; | ||
| 423 | list.toArray(res); | ||
| 424 | return res; | ||
| 425 | } | ||
| 426 | |||
| 427 | /** | ||
| 428 | * We convert script values to the nearest Java value. | ||
| 429 | * We unwrap wrapped Java objects so that access from | ||
| 430 | * Bindings.get() would return "workable" value for Java. | ||
| 431 | * But, at the same time, we need to make few special cases | ||
| 432 | * and hence the following function is used. | ||
| 433 | */ | ||
| 434 | private Object jsToJava(Object jsObj) { | ||
| 435 | if (jsObj instanceof Wrapper) { | ||
| 436 | Wrapper njb = (Wrapper) jsObj; | ||
| 437 | /* importClass feature of ImporterTopLevel puts | ||
| 438 | * NativeJavaClass in global scope. If we unwrap | ||
| 439 | * it, importClass won't work. | ||
| 440 | */ | ||
| 441 | if (njb instanceof NativeJavaClass) { | ||
| 442 | return njb; | ||
| 443 | } | ||
| 444 | |||
| 445 | /* script may use Java primitive wrapper type objects | ||
| 446 | * (such as java.lang.Integer, java.lang.Boolean etc) | ||
| 447 | * explicitly. If we unwrap, then these script objects | ||
| 448 | * will become script primitive types. For example, | ||
| 449 | * | ||
| 450 | * var x = new java.lang.Double(3.0); print(typeof x); | ||
| 451 | * | ||
| 452 | * will print 'number'. We don't want that to happen. | ||
| 453 | */ | ||
| 454 | Object obj = njb.unwrap(); | ||
| 455 | if (obj instanceof Number || obj instanceof String || | ||
| 456 | obj instanceof Boolean || obj instanceof Character) { | ||
| 457 | // special type wrapped -- we just leave it as is. | ||
| 458 | return njb; | ||
| 459 | } else { | ||
| 460 | // return unwrapped object for any other object. | ||
| 461 | return obj; | ||
| 462 | } | ||
| 463 | } else { // not-a-Java-wrapper | ||
| 464 | return jsObj; | ||
| 465 | } | ||
| 466 | } | ||
| 467 | } | ||