/*

 * Copyright (c) 2003, 2008, 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 sun.swing;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import java.lang.reflect.AccessibleObject;

import java.security.AccessController;

import java.security.PrivilegedAction;

import javax.swing.UIDefaults;

import sun.reflect.misc.ReflectUtil;

/**

 * SwingLazyValue is a copy of ProxyLazyValue that does not snapshot the

 * AccessControlContext or use a doPrivileged to resolve the class name.

 * It's intented for use in places in Swing where we need ProxyLazyValue, this

 * should never be used in a place where the developer could supply the

 * arguments.

 *

 */

public class SwingLazyValue implements UIDefaults.LazyValue {

    private String className;

    private String methodName;

    private Object[] args;

    public SwingLazyValue(String c) {

        this(c, (String)null);

    }

    public SwingLazyValue(String c, String m) {

        this(c, m, null);

    }

    public SwingLazyValue(String c, Object[] o) {

        this(c, null, o);

    }

    public SwingLazyValue(String c, String m, Object[] o) {

        className = c;

        methodName = m;

        if (o != null) {

            args = o.clone();

        }

    }

    public Object createValue(final UIDefaults table) {

        try {

            ReflectUtil.checkPackageAccess(className);

            Class<?> c = Class.forName(className, true, null);

            if (methodName != null) {

                Class[] types = getClassArray(args);

                Method m = c.getMethod(methodName, types);

                makeAccessible(m);

                return m.invoke(c, args);

            } else {

                Class[] types = getClassArray(args);

                Constructor constructor = c.getConstructor(types);

                makeAccessible(constructor);

                return constructor.newInstance(args);

            }

        } catch (Exception e) {

            // Ideally we would throw an exception, unfortunately

            // often times there are errors as an initial look and

            // feel is loaded before one can be switched. Perhaps a

            // flag should be added for debugging, so that if true

            // the exception would be thrown.

        }

        return null;

    }

    private void makeAccessible(final AccessibleObject object) {

        AccessController.doPrivileged(new PrivilegedAction<Void>() {

            public Void run() {

                object.setAccessible(true);

                return null;

            }

        });

    }

    private Class[] getClassArray(Object[] args) {

        Class[] types = null;

        if (args!=null) {

            types = new Class[args.length];

            for (int i = 0; i< args.length; i++) {

                /* PENDING(ges): At present only the primitive types

                   used are handled correctly; this should eventually

                   handle all primitive types */

                if (args[i] instanceof java.lang.Integer) {

                    types[i]=Integer.TYPE;

                } else if (args[i] instanceof java.lang.Boolean) {

                    types[i]=Boolean.TYPE;

                } else if (args[i] instanceof javax.swing.plaf.ColorUIResource) {

                    /* PENDING(ges) Currently the Reflection APIs do not

                       search superclasses of parameters supplied for

                       constructor/method lookup.  Since we only have

                       one case where this is needed, we substitute

                       directly instead of adding a massive amount

                       of mechanism for this.  Eventually this will

                       probably need to handle the general case as well.

                    */

                    types[i]=java.awt.Color.class;

                } else {

                    types[i]=args[i].getClass();

                }

            }

        }

        return types;

    }

}