/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * The contents of this file are subject to the Netscape Public * License Version 1.1 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.mozilla.org/NPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is Rhino code, released * May 6, 1999. * * The Initial Developer of the Original Code is Netscape * Communications Corporation.  Portions created by Netscape are * Copyright (C) 1997-2000 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * Norris Boyd * * Alternatively, the contents of this file may be used under the * terms of the GNU Public License (the "GPL"), in which case the * provisions of the GPL are applicable instead of those above. * If you wish to allow use of your version of this file only * under the terms of the GPL and not to allow others to use your * version of this file under the NPL, indicate your decision by * deleting the provisions above and replace them with the notice * and other provisions required by the GPL.  If you do not delete * the provisions above, a recipient may use your version of this * file under either the NPL or the GPL. */package org.mozilla.javascript;import java.lang.reflect.*;/** * Avoid loading classes unless they are used. * * <p> This improves startup time and average memory usage. */public final class LazilyLoadedCtor {    public LazilyLoadedCtor(ScriptableObject scope,                     String ctorName, String className, boolean sealed)    {        this.className = className;        this.ctorName = ctorName;        this.sealed = sealed;        if (getter == null) {            Method[] methods = FunctionObject.getMethodList(getClass());            getter = FunctionObject.findSingleMethod(methods, "getProperty");            setter = FunctionObject.findSingleMethod(methods, "setProperty");        }        scope.defineProperty(ctorName, this, getter, setter,                             ScriptableObject.DONTENUM);    }    public Object getProperty(ScriptableObject obj) {        synchronized (obj) {            if (!isReplaced) {                boolean removeOnError = false;                Class cl = Kit.classOrNull(className);                if (cl == null) {                    removeOnError = true;                } else {                    try {                        ScriptableObject.defineClass(obj, cl, sealed);                        isReplaced = true;                    } catch (InvocationTargetException ex) {                        Throwable target = ex.getTargetException();                        if (target instanceof RuntimeException) {                            throw (RuntimeException)target;                        }                        removeOnError = true;                    } catch (RhinoException ex) {                        removeOnError = true;                    } catch (InstantiationException ex) {                        removeOnError = true;                    } catch (IllegalAccessException ex) {                        removeOnError = true;                    } catch (SecurityException ex) {                        // Treat security exceptions as absence of object.                        // They can be due to the following reasons:                        //  java.lang.RuntimePermission createClassLoader                        removeOnError = true;                    } catch (LinkageError ex) {                        // No dependant classes                        removeOnError = true;                    }                }                if (removeOnError) {                    obj.delete(ctorName);                    return Scriptable.NOT_FOUND;                }            }        }        // Get just added object        return obj.get(ctorName, obj);    }    public Object setProperty(ScriptableObject obj, Object val) {        synchronized (obj) {            isReplaced = true;            return val;        }    }    private static Method getter, setter;    private String ctorName;    private String className;    private boolean sealed;    private boolean isReplaced;}