jdk8-mips64-public/nashorn: src/jdk/nashorn/api/scripting/ScriptObjectMirror.java@07f32a26bc1e (annotated)

src/jdk/nashorn/api/scripting/ScriptObjectMirror.java@07f32a26bc1e (annotated)

src/jdk/nashorn/api/scripting/ScriptObjectMirror.java

Tue, 02 Jun 2015 10:55:17 +0200

author: attila
date: Tue, 02 Jun 2015 10:55:17 +0200
changeset 1394: 07f32a26bc1e
parent 1250: 9ee1fc3f6136
child 1399: 22640d19073c
permissions: -rw-r--r--

8066773: JSON-friendly wrapper for objects
Reviewed-by: jlaskey, lagergren, sundar

 /*
  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.nashorn.api.scripting;
 import java.nio.ByteBuffer;
 import java.security.AccessControlContext;
 import java.security.AccessController;
 import java.security.Permissions;
 import java.security.PrivilegedAction;
 import java.security.ProtectionDomain;
 import java.util.AbstractMap;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.Callable;
 import javax.script.Bindings;
 import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.ConsString;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ECMAException;
 import jdk.nashorn.internal.runtime.JSONListAdapter;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
 /**
  * Mirror object that wraps a given Nashorn Script object.
  *
  * @since 1.8u40
  */
 @jdk.Exported
 public final class ScriptObjectMirror extends AbstractJSObject implements Bindings {
     private static AccessControlContext getContextAccCtxt() {
         final Permissions perms = new Permissions();
         perms.add(new RuntimePermission(Context.NASHORN_GET_CONTEXT));
         return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) });
     }
     private static final AccessControlContext GET_CONTEXT_ACC_CTXT = getContextAccCtxt();
     private final ScriptObject sobj;
     private final Global  global;
     private final boolean strict;
     private final boolean jsonCompatible;
     @Override
     public boolean equals(final Object other) {
         if (other instanceof ScriptObjectMirror) {
             return sobj.equals(((ScriptObjectMirror)other).sobj);
         }
         return false;
     }
     @Override
     public int hashCode() {
         return sobj.hashCode();
     }
     @Override
     public String toString() {
         return inGlobal(new Callable<String>() {
             @Override
             public String call() {
                 return ScriptRuntime.safeToString(sobj);
             }
         });
     }
     // JSObject methods
     @Override
     public Object call(final Object thiz, final Object... args) {
         final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         try {
             if (globalChanged) {
                 Context.setGlobal(global);
             }
             if (sobj instanceof ScriptFunction) {
                 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args;
                 final Object self = globalChanged? wrapLikeMe(thiz, oldGlobal) : thiz;
                 return wrapLikeMe(ScriptRuntime.apply((ScriptFunction)sobj, unwrap(self, global), unwrapArray(modArgs, global)));
             }
             throw new RuntimeException("not a function: " + toString());
         } catch (final NashornException ne) {
             throw ne.initEcmaError(global);
         } catch (final RuntimeException | Error e) {
             throw e;
         } catch (final Throwable t) {
             throw new RuntimeException(t);
         } finally {
             if (globalChanged) {
                 Context.setGlobal(oldGlobal);
             }
         }
     }
     @Override
     public Object newObject(final Object... args) {
         final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         try {
             if (globalChanged) {
                 Context.setGlobal(global);
             }
             if (sobj instanceof ScriptFunction) {
                 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args;
                 return wrapLikeMe(ScriptRuntime.construct((ScriptFunction)sobj, unwrapArray(modArgs, global)));
             }
             throw new RuntimeException("not a constructor: " + toString());
         } catch (final NashornException ne) {
             throw ne.initEcmaError(global);
         } catch (final RuntimeException | Error e) {
             throw e;
         } catch (final Throwable t) {
             throw new RuntimeException(t);
         } finally {
             if (globalChanged) {
                 Context.setGlobal(oldGlobal);
             }
         }
     }
     @Override
     public Object eval(final String s) {
         return inGlobal(new Callable<Object>() {
             @Override
             public Object call() {
                 final Context context = AccessController.doPrivileged(
                         new PrivilegedAction<Context>() {
                             @Override
                             public Context run() {
                                 return Context.getContext();
                             }
                         }, GET_CONTEXT_ACC_CTXT);
                 return wrapLikeMe(context.eval(global, s, sobj, null, false));
             }
         });
     }
     /**
      * Call member function
      * @param functionName function name
      * @param args         arguments
      * @return return value of function
      */
     public Object callMember(final String functionName, final Object... args) {
         Objects.requireNonNull(functionName);
         final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         try {
             if (globalChanged) {
                 Context.setGlobal(global);
             }
             final Object val = sobj.get(functionName);
             if (val instanceof ScriptFunction) {
                 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args;
                 return wrapLikeMe(ScriptRuntime.apply((ScriptFunction)val, sobj, unwrapArray(modArgs, global)));
             } else if (val instanceof JSObject && ((JSObject)val).isFunction()) {
                 return ((JSObject)val).call(sobj, args);
             }
             throw new NoSuchMethodException("No such function " + functionName);
         } catch (final NashornException ne) {
             throw ne.initEcmaError(global);
         } catch (final RuntimeException | Error e) {
             throw e;
         } catch (final Throwable t) {
             throw new RuntimeException(t);
         } finally {
             if (globalChanged) {
                 Context.setGlobal(oldGlobal);
             }
         }
     }
     @Override
     public Object getMember(final String name) {
         Objects.requireNonNull(name);
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return wrapLikeMe(sobj.get(name));
             }
         });
     }
     @Override
     public Object getSlot(final int index) {
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return wrapLikeMe(sobj.get(index));
             }
         });
     }
     @Override
     public boolean hasMember(final String name) {
         Objects.requireNonNull(name);
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.has(name);
             }
         });
     }
     @Override
     public boolean hasSlot(final int slot) {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.has(slot);
             }
         });
     }
     @Override
     public void removeMember(final String name) {
         Objects.requireNonNull(name);
         remove(name);
     }
     @Override
     public void setMember(final String name, final Object value) {
         Objects.requireNonNull(name);
         put(name, value);
     }
     @Override
     public void setSlot(final int index, final Object value) {
         inGlobal(new Callable<Void>() {
             @Override public Void call() {
                 sobj.set(index, unwrap(value, global), getCallSiteFlags());
                 return null;
             }
         });
     }
     /**
      * Nashorn extension: setIndexedPropertiesToExternalArrayData.
      * set indexed properties be exposed from a given nio ByteBuffer.
      *
      * @param buf external buffer - should be a nio ByteBuffer
      */
     public void setIndexedPropertiesToExternalArrayData(final ByteBuffer buf) {
         inGlobal(new Callable<Void>() {
             @Override public Void call() {
                 sobj.setArray(ArrayData.allocate(buf));
                 return null;
             }
         });
     }
     @Override
     public boolean isInstance(final Object obj) {
         if (! (obj instanceof ScriptObjectMirror)) {
             return false;
         }
         final ScriptObjectMirror instance = (ScriptObjectMirror)obj;
         // if not belongs to my global scope, return false
         if (global != instance.global) {
             return false;
         }
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.isInstance(instance.sobj);
             }
         });
     }
     @Override
     public String getClassName() {
         return sobj.getClassName();
     }
     @Override
     public boolean isFunction() {
         return sobj instanceof ScriptFunction;
     }
     @Override
     public boolean isStrictFunction() {
         return isFunction() && ((ScriptFunction)sobj).isStrict();
     }
     @Override
     public boolean isArray() {
         return sobj.isArray();
     }
     // javax.script.Bindings methods
     @Override
     public void clear() {
         inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 sobj.clear(strict);
                 return null;
             }
         });
     }
     @Override
     public boolean containsKey(final Object key) {
         checkKey(key);
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.containsKey(key);
             }
         });
     }
     @Override
     public boolean containsValue(final Object value) {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.containsValue(unwrap(value, global));
             }
         });
     }
     @Override
     public Set<Map.Entry<String, Object>> entrySet() {
         return inGlobal(new Callable<Set<Map.Entry<String, Object>>>() {
             @Override public Set<Map.Entry<String, Object>> call() {
                 final Iterator<String>               iter    = sobj.propertyIterator();
                 final Set<Map.Entry<String, Object>> entries = new LinkedHashSet<>();
                 while (iter.hasNext()) {
                     final String key   = iter.next();
                     final Object value = translateUndefined(wrapLikeMe(sobj.get(key)));
                     entries.add(new AbstractMap.SimpleImmutableEntry<>(key, value));
                 }
                 return Collections.unmodifiableSet(entries);
             }
         });
     }
     @Override
     public Object get(final Object key) {
         checkKey(key);
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return translateUndefined(wrapLikeMe(sobj.get(key)));
             }
         });
     }
     @Override
     public boolean isEmpty() {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.isEmpty();
             }
         });
     }
     @Override
     public Set<String> keySet() {
         return inGlobal(new Callable<Set<String>>() {
             @Override public Set<String> call() {
                 final Iterator<String> iter   = sobj.propertyIterator();
                 final Set<String>      keySet = new LinkedHashSet<>();
                 while (iter.hasNext()) {
                     keySet.add(iter.next());
                 }
                 return Collections.unmodifiableSet(keySet);
             }
         });
     }
     @Override
     public Object put(final String key, final Object value) {
         checkKey(key);
         final ScriptObject oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 final Object modValue = globalChanged? wrapLikeMe(value, oldGlobal) : value;
                 return translateUndefined(wrapLikeMe(sobj.put(key, unwrap(modValue, global), strict)));
             }
         });
     }
     @Override
     public void putAll(final Map<? extends String, ? extends Object> map) {
         Objects.requireNonNull(map, "map is null");
         final ScriptObject oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 for (final Map.Entry<? extends String, ? extends Object> entry : map.entrySet()) {
                     final Object value = entry.getValue();
                     final Object modValue = globalChanged? wrapLikeMe(value, oldGlobal) : value;
                     final String key = entry.getKey();
                     checkKey(key);
                     sobj.set(key, unwrap(modValue, global), getCallSiteFlags());
                 }
                 return null;
             }
         });
     }
     @Override
     public Object remove(final Object key) {
         checkKey(key);
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return translateUndefined(wrapLikeMe(sobj.remove(key, strict)));
             }
         });
     }
     /**
      * Delete a property from this object.
      *
      * @param key the property to be deleted
      *
      * @return if the delete was successful or not
      */
     public boolean delete(final Object key) {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.delete(unwrap(key, global), strict);
             }
         });
     }
     @Override
     public int size() {
         return inGlobal(new Callable<Integer>() {
             @Override public Integer call() {
                 return sobj.size();
             }
         });
     }
     @Override
     public Collection<Object> values() {
         return inGlobal(new Callable<Collection<Object>>() {
             @Override public Collection<Object> call() {
                 final List<Object>     values = new ArrayList<>(size());
                 final Iterator<Object> iter   = sobj.valueIterator();
                 while (iter.hasNext()) {
                     values.add(translateUndefined(wrapLikeMe(iter.next())));
                 }
                 return Collections.unmodifiableList(values);
             }
         });
     }
     // Support for ECMAScript Object API on mirrors
     /**
      * Return the __proto__ of this object.
      * @return __proto__ object.
      */
     public Object getProto() {
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return wrapLikeMe(sobj.getProto());
             }
         });
     }
     /**
      * Set the __proto__ of this object.
      * @param proto new proto for this object
      */
     public void setProto(final Object proto) {
         inGlobal(new Callable<Void>() {
             @Override public Void call() {
                 sobj.setPrototypeOf(unwrap(proto, global));
                 return null;
             }
         });
     }
     /**
      * ECMA 8.12.1 [[GetOwnProperty]] (P)
      *
      * @param key property key
      *
      * @return Returns the Property Descriptor of the named own property of this
      * object, or undefined if absent.
      */
     public Object getOwnPropertyDescriptor(final String key) {
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 return wrapLikeMe(sobj.getOwnPropertyDescriptor(key));
             }
         });
     }
     /**
      * return an array of own property keys associated with the object.
      *
      * @param all True if to include non-enumerable keys.
      * @return Array of keys.
      */
     public String[] getOwnKeys(final boolean all) {
         return inGlobal(new Callable<String[]>() {
             @Override public String[] call() {
                 return sobj.getOwnKeys(all);
             }
         });
     }
     /**
      * Flag this script object as non extensible
      *
      * @return the object after being made non extensible
      */
     public ScriptObjectMirror preventExtensions() {
         return inGlobal(new Callable<ScriptObjectMirror>() {
             @Override public ScriptObjectMirror call() {
                 sobj.preventExtensions();
                 return ScriptObjectMirror.this;
             }
         });
     }
     /**
      * Check if this script object is extensible
      * @return true if extensible
      */
     public boolean isExtensible() {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.isExtensible();
             }
         });
     }
     /**
      * ECMAScript 15.2.3.8 - seal implementation
      * @return the sealed script object
      */
     public ScriptObjectMirror seal() {
         return inGlobal(new Callable<ScriptObjectMirror>() {
             @Override public ScriptObjectMirror call() {
                 sobj.seal();
                 return ScriptObjectMirror.this;
             }
         });
     }
     /**
      * Check whether this script object is sealed
      * @return true if sealed
      */
     public boolean isSealed() {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.isSealed();
             }
         });
     }
     /**
      * ECMA 15.2.39 - freeze implementation. Freeze this script object
      * @return the frozen script object
      */
     public ScriptObjectMirror freeze() {
         return inGlobal(new Callable<ScriptObjectMirror>() {
             @Override public ScriptObjectMirror call() {
                 sobj.freeze();
                 return ScriptObjectMirror.this;
             }
         });
     }
     /**
      * Check whether this script object is frozen
      * @return true if frozen
      */
     public boolean isFrozen() {
         return inGlobal(new Callable<Boolean>() {
             @Override public Boolean call() {
                 return sobj.isFrozen();
             }
         });
     }
     /**
      * Utility to check if given object is ECMAScript undefined value
      *
      * @param obj object to check
      * @return true if 'obj' is ECMAScript undefined value
      */
     public static boolean isUndefined(final Object obj) {
         return obj == ScriptRuntime.UNDEFINED;
     }
     /**
      * Utility to convert this script object to the given type.
      *
      * @param <T> destination type to convert to
      * @param type destination type to convert to
      * @return converted object
      */
     public <T> T to(final Class<T> type) {
         return inGlobal(new Callable<T>() {
             @Override
             public T call() {
                 return type.cast(ScriptUtils.convert(sobj, type));
             }
         });
     }
     /**
      * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings.
      *
      * @param obj object to be wrapped/converted
      * @param homeGlobal global to which this object belongs. Not used for ConsStrings.
      * @return wrapped/converted object
      */
     public static Object wrap(final Object obj, final Object homeGlobal) {
         return wrap(obj, homeGlobal, false);
     }
     /**
      * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings. The
      * created wrapper will implement the Java {@code List} interface if {@code obj} is a JavaScript
      * {@code Array} object; this is compatible with Java JSON libraries expectations. Arrays retrieved through its
      * properties (transitively) will also implement the list interface.
      *
      * @param obj object to be wrapped/converted
      * @param homeGlobal global to which this object belongs. Not used for ConsStrings.
      * @return wrapped/converted object
      */
     public static Object wrapAsJSONCompatible(final Object obj, final Object homeGlobal) {
         return wrap(obj, homeGlobal, true);
     }
     /**
      * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings.
      *
      * @param obj object to be wrapped/converted
      * @param homeGlobal global to which this object belongs. Not used for ConsStrings.
      * @param jsonCompatible if true, the created wrapper will implement the Java {@code List} interface if
      * {@code obj} is a JavaScript {@code Array} object. Arrays retrieved through its properties (transitively)
      * will also implement the list interface.
      * @return wrapped/converted object
      */
     private static Object wrap(final Object obj, final Object homeGlobal, final boolean jsonCompatible) {
         if(obj instanceof ScriptObject) {
             if (!(homeGlobal instanceof Global)) {
                 return obj;
             }
             final ScriptObject sobj = (ScriptObject)obj;
             final Global global = (Global)homeGlobal;
             final ScriptObjectMirror mirror = new ScriptObjectMirror(sobj, global, jsonCompatible);
             if (jsonCompatible && sobj.isArray()) {
                 return new JSONListAdapter(mirror, global);
             }
             return mirror;
         } else if(obj instanceof ConsString) {
             return obj.toString();
         } else if (jsonCompatible && obj instanceof ScriptObjectMirror) {
             // Since choosing JSON compatible representation is an explicit decision on user's part, if we're asked to
             // wrap a mirror that was not JSON compatible, explicitly create its compatible counterpart following the
             // principle of least surprise.
             return ((ScriptObjectMirror)obj).asJSONCompatible();
         }
         return obj;
     }
     /**
      * Wraps the passed object with the same jsonCompatible flag as this mirror.
      * @param obj the object
      * @param homeGlobal the object's home global.
      * @return a wrapper for the object.
      */
     private Object wrapLikeMe(final Object obj, final Object homeGlobal) {
         return wrap(obj, homeGlobal, jsonCompatible);
     }
     /**
      * Wraps the passed object with the same home global and jsonCompatible flag as this mirror.
      * @param obj the object
      * @return a wrapper for the object.
      */
     private Object wrapLikeMe(final Object obj) {
         return wrapLikeMe(obj, global);
     }
     /**
      * Unwrap a script object mirror if needed.
      *
      * @param obj object to be unwrapped
      * @param homeGlobal global to which this object belongs
      * @return unwrapped object
      */
     public static Object unwrap(final Object obj, final Object homeGlobal) {
         if (obj instanceof ScriptObjectMirror) {
             final ScriptObjectMirror mirror = (ScriptObjectMirror)obj;
             return (mirror.global == homeGlobal)? mirror.sobj : obj;
         } else if (obj instanceof JSONListAdapter) {
             return ((JSONListAdapter)obj).unwrap(homeGlobal);
         }
         return obj;
     }
     /**
      * Wrap an array of object to script object mirrors if needed.
      *
      * @param args array to be unwrapped
      * @param homeGlobal global to which this object belongs
      * @return wrapped array
      */
     public static Object[] wrapArray(final Object[] args, final Object homeGlobal) {
         return wrapArray(args, homeGlobal, false);
     }
     private static Object[] wrapArray(final Object[] args, final Object homeGlobal, final boolean jsonCompatible) {
         if (args == null || args.length == 0) {
             return args;
         }
         final Object[] newArgs = new Object[args.length];
         int index = 0;
         for (final Object obj : args) {
             newArgs[index] = wrap(obj, homeGlobal, jsonCompatible);
             index++;
         }
         return newArgs;
     }
     private Object[] wrapArrayLikeMe(final Object[] args, final Object homeGlobal) {
         return wrapArray(args, homeGlobal, jsonCompatible);
     }
     /**
      * Unwrap an array of script object mirrors if needed.
      *
      * @param args array to be unwrapped
      * @param homeGlobal global to which this object belongs
      * @return unwrapped array
      */
     public static Object[] unwrapArray(final Object[] args, final Object homeGlobal) {
         if (args == null || args.length == 0) {
             return args;
         }
         final Object[] newArgs = new Object[args.length];
         int index = 0;
         for (final Object obj : args) {
             newArgs[index] = unwrap(obj, homeGlobal);
             index++;
         }
         return newArgs;
     }
     /**
      * Are the given objects mirrors to same underlying object?
      *
      * @param obj1 first object
      * @param obj2 second object
      * @return true if obj1 and obj2 are identical script objects or mirrors of it.
      */
     public static boolean identical(final Object obj1, final Object obj2) {
         final Object o1 = (obj1 instanceof ScriptObjectMirror)?
             ((ScriptObjectMirror)obj1).sobj : obj1;
         final Object o2 = (obj2 instanceof ScriptObjectMirror)?
             ((ScriptObjectMirror)obj2).sobj : obj2;
         return o1 == o2;
     }
     // package-privates below this.
     ScriptObjectMirror(final ScriptObject sobj, final Global global) {
         this(sobj, global, false);
     }
     private ScriptObjectMirror(final ScriptObject sobj, final Global global, final boolean jsonCompatible) {
         assert sobj != null : "ScriptObjectMirror on null!";
         assert global != null : "home Global is null";
         this.sobj = sobj;
         this.global = global;
         this.strict = global.isStrictContext();
         this.jsonCompatible = jsonCompatible;
     }
     // accessors for script engine
     ScriptObject getScriptObject() {
         return sobj;
     }
     Global getHomeGlobal() {
         return global;
     }
     static Object translateUndefined(final Object obj) {
         return (obj == ScriptRuntime.UNDEFINED)? null : obj;
     }
     private int getCallSiteFlags() {
         return strict ? NashornCallSiteDescriptor.CALLSITE_STRICT : 0;
     }
     // internals only below this.
     private <V> V inGlobal(final Callable<V> callable) {
         final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         if (globalChanged) {
             Context.setGlobal(global);
         }
         try {
             return callable.call();
         } catch (final NashornException ne) {
             throw ne.initEcmaError(global);
         } catch (final RuntimeException e) {
             throw e;
         } catch (final Exception e) {
             throw new AssertionError("Cannot happen", e);
         } finally {
             if (globalChanged) {
                 Context.setGlobal(oldGlobal);
             }
         }
     }
     /**
      * Ensures the key is not null, empty string, or a non-String object. The contract of the {@link Bindings}
      * interface requires that these are not accepted as keys.
      * @param key the key to check
      * @throws NullPointerException if key is null
      * @throws ClassCastException if key is not a String
      * @throws IllegalArgumentException if key is empty string
      */
     private static void checkKey(final Object key) {
         Objects.requireNonNull(key, "key can not be null");
         if (!(key instanceof String)) {
             throw new ClassCastException("key should be a String. It is " + key.getClass().getName() + " instead.");
         } else if (((String)key).length() == 0) {
             throw new IllegalArgumentException("key can not be empty");
         }
     }
     @Override @Deprecated
     public double toNumber() {
         return inGlobal(new Callable<Double>() {
             @Override public Double call() {
                 return JSType.toNumber(sobj);
             }
         });
     }
     @Override
     public Object getDefaultValue(final Class<?> hint) {
         return inGlobal(new Callable<Object>() {
             @Override public Object call() {
                 try {
                     return sobj.getDefaultValue(hint);
                 } catch (final ECMAException e) {
                     // We're catching ECMAException (likely TypeError), and translating it to
                     // UnsupportedOperationException. This in turn will be translated into TypeError of the
                     // caller's Global by JSType#toPrimitive(JSObject,Class) therefore ensuring that it's
                     // recognized as "instanceof TypeError" in the caller.
                     throw new UnsupportedOperationException(e.getMessage(), e);
                 }
             }
         });
     }
     private ScriptObjectMirror asJSONCompatible() {
         if (this.jsonCompatible) {
             return this;
         }
         return new ScriptObjectMirror(sobj, global, true);
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/api/scripting/ScriptObjectMirror.java@07f32a26bc1e (annotated)

src/jdk/nashorn/api/scripting/ScriptObjectMirror.java