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/*
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* Copyright 1996-2009 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.beans;
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import com.sun.beans.finder.ClassFinder;
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import java.awt.GraphicsEnvironment;
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import java.beans.beancontext.BeanContext;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectStreamClass;
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import java.io.StreamCorruptedException;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Iterator;
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import java.util.ServiceLoader;
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import sun.awt.AppContext;
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import sun.beans.AppletProxy;
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/**
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* This class provides some general purpose beans control methods.
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*/
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public class Beans {
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private static final Object DESIGN_TIME = new Object();
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private static final Object GUI_AVAILABLE = new Object();
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/**
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* <p>
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* Instantiate a JavaBean.
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* </p>
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*
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* @param cls the class-loader from which we should create
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* the bean. If this is null, then the system
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* class-loader is used.
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* @param beanName the name of the bean within the class-loader.
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* For example "sun.beanbox.foobah"
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*
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* @exception ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception IOException if an I/O error occurs.
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*/
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public static Object instantiate(ClassLoader cls, String beanName) throws IOException, ClassNotFoundException {
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return Beans.instantiate(cls, beanName, null, null);
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}
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/**
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* <p>
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* Instantiate a JavaBean.
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* </p>
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*
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* @param cls the class-loader from which we should create
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* the bean. If this is null, then the system
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* class-loader is used.
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* @param beanName the name of the bean within the class-loader.
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* For example "sun.beanbox.foobah"
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* @param beanContext The BeanContext in which to nest the new bean
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*
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* @exception ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception IOException if an I/O error occurs.
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*/
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public static Object instantiate(ClassLoader cls, String beanName, BeanContext beanContext) throws IOException, ClassNotFoundException {
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return Beans.instantiate(cls, beanName, beanContext, null);
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}
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/**
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* Instantiate a bean.
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* <p>
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* The bean is created based on a name relative to a class-loader.
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* This name should be a dot-separated name such as "a.b.c".
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* <p>
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* In Beans 1.0 the given name can indicate either a serialized object
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* or a class. Other mechanisms may be added in the future. In
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* beans 1.0 we first try to treat the beanName as a serialized object
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* name then as a class name.
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* <p>
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* When using the beanName as a serialized object name we convert the
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* given beanName to a resource pathname and add a trailing ".ser" suffix.
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* We then try to load a serialized object from that resource.
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* <p>
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* For example, given a beanName of "x.y", Beans.instantiate would first
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* try to read a serialized object from the resource "x/y.ser" and if
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* that failed it would try to load the class "x.y" and create an
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* instance of that class.
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* <p>
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* If the bean is a subtype of java.applet.Applet, then it is given
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* some special initialization. First, it is supplied with a default
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* AppletStub and AppletContext. Second, if it was instantiated from
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* a classname the applet's "init" method is called. (If the bean was
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* deserialized this step is skipped.)
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* <p>
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* Note that for beans which are applets, it is the caller's responsiblity
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* to call "start" on the applet. For correct behaviour, this should be done
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* after the applet has been added into a visible AWT container.
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* <p>
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* Note that applets created via beans.instantiate run in a slightly
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* different environment than applets running inside browsers. In
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* particular, bean applets have no access to "parameters", so they may
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* wish to provide property get/set methods to set parameter values. We
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* advise bean-applet developers to test their bean-applets against both
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* the JDK appletviewer (for a reference browser environment) and the
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* BDK BeanBox (for a reference bean container).
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*
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* @param cls the class-loader from which we should create
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* the bean. If this is null, then the system
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* class-loader is used.
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* @param beanName the name of the bean within the class-loader.
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* For example "sun.beanbox.foobah"
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* @param beanContext The BeanContext in which to nest the new bean
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* @param initializer The AppletInitializer for the new bean
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*
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* @exception ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception IOException if an I/O error occurs.
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*/
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public static Object instantiate(ClassLoader cls, String beanName, BeanContext beanContext,
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/** TBD: Oops , this is bad. The AppletInitializer is used from
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* public API. I have not noticed that sooner. Opps.
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AppletInitializer initializer
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* meanwhile turning into object, but this cannot be final solution:
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*/
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Object initializer
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) throws IOException, ClassNotFoundException {
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InputStream ins;
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ObjectInputStream oins = null;
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Object result = null;
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boolean serialized = false;
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IOException serex = null;
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// If the given classloader is null, we check if an
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// system classloader is available and (if so)
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// use that instead.
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// Note that calls on the system class loader will
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// look in the bootstrap class loader first.
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if (cls == null) {
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try {
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cls = ClassLoader.getSystemClassLoader();
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} catch (SecurityException ex) {
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// We're not allowed to access the system class loader.
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// Drop through.
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}
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}
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// Try to find a serialized object with this name
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final String serName = beanName.replace('.','/').concat(".ser");
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final ClassLoader loader = cls;
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ins = (InputStream)AccessController.doPrivileged
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(new PrivilegedAction() {
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public Object run() {
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if (loader == null)
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return ClassLoader.getSystemResourceAsStream(serName);
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else
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return loader.getResourceAsStream(serName);
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}
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});
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if (ins != null) {
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try {
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if (cls == null) {
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oins = new ObjectInputStream(ins);
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} else {
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oins = new ObjectInputStreamWithLoader(ins, cls);
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}
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result = oins.readObject();
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serialized = true;
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oins.close();
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} catch (IOException ex) {
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ins.close();
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// Drop through and try opening the class. But remember
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// the exception in case we can't find the class either.
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serex = ex;
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} catch (ClassNotFoundException ex) {
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ins.close();
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throw ex;
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}
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}
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if (result == null) {
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// No serialized object, try just instantiating the class
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Class cl;
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try {
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cl = ClassFinder.findClass(beanName, cls);
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} catch (ClassNotFoundException ex) {
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// There is no appropriate class. If we earlier tried to
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// deserialize an object and got an IO exception, throw that,
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// otherwise rethrow the ClassNotFoundException.
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if (serex != null) {
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throw serex;
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}
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throw ex;
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}
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/*
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* Try to instantiate the class.
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*/
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try {
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result = cl.newInstance();
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} catch (Exception ex) {
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// We have to remap the exception to one in our signature.
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// But we pass extra information in the detail message.
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throw new ClassNotFoundException("" + cl + " : " + ex, ex);
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}
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}
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if (result != null) {
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// Ok, if the result is an applet initialize it.
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Iterator<AppletProxy> it = ServiceLoader.load(AppletProxy.class).iterator();
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AppletProxy ap = it.hasNext() ? it.next() : null;
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if (ap != null || !ap.initialize(
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result, initializer, serialized, beanName, beanContext, cls
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)) {
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if (beanContext != null) beanContext.add(result);
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}
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}
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return result;
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}
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/**
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* From a given bean, obtain an object representing a specified
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* type view of that source object.
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* <p>
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* The result may be the same object or a different object. If
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* the requested target view isn't available then the given
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* bean is returned.
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* <p>
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* This method is provided in Beans 1.0 as a hook to allow the
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* addition of more flexible bean behaviour in the future.
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*
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* @param bean Object from which we want to obtain a view.
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* @param targetType The type of view we'd like to get.
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*
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*/
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public static Object getInstanceOf(Object bean, Class<?> targetType) {
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return bean;
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}
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duke@0
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/**
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* Check if a bean can be viewed as a given target type.
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* The result will be true if the Beans.getInstanceof method
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* can be used on the given bean to obtain an object that
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* represents the specified targetType type view.
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|
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*
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* @param bean Bean from which we want to obtain a view.
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* @param targetType The type of view we'd like to get.
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* @return "true" if the given bean supports the given targetType.
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|
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*
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*/
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|
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public static boolean isInstanceOf(Object bean, Class<?> targetType) {
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return Introspector.isSubclass(bean.getClass(), targetType);
|
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}
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|
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/**
|
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* Test if we are in design-mode.
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|
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*
|
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* @return True if we are running in an application construction
|
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|
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* environment.
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*
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malenkov@1077
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* @see DesignMode
|
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|
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*/
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|
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public static boolean isDesignTime() {
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Object value = AppContext.getAppContext().get(DESIGN_TIME);
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return (value instanceof Boolean) && (Boolean) value;
|
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|
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}
|
duke@0
|
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|
duke@0
|
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/**
|
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|
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* Determines whether beans can assume a GUI is available.
|
duke@0
|
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*
|
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|
308 |
* @return True if we are running in an environment where beans
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|
309 |
* can assume that an interactive GUI is available, so they
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|
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* can pop up dialog boxes, etc. This will normally return
|
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|
311 |
* true in a windowing environment, and will normally return
|
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|
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* false in a server environment or if an application is
|
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|
313 |
* running as part of a batch job.
|
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*
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malenkov@1077
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* @see Visibility
|
duke@0
|
316 |
*
|
duke@0
|
317 |
*/
|
duke@0
|
318 |
public static boolean isGuiAvailable() {
|
malenkov@1077
|
319 |
Object value = AppContext.getAppContext().get(GUI_AVAILABLE);
|
malenkov@1077
|
320 |
return (value instanceof Boolean) ? (Boolean) value : !GraphicsEnvironment.isHeadless();
|
duke@0
|
321 |
}
|
duke@0
|
322 |
|
duke@0
|
323 |
/**
|
duke@0
|
324 |
* Used to indicate whether of not we are running in an application
|
duke@0
|
325 |
* builder environment.
|
duke@0
|
326 |
*
|
duke@0
|
327 |
* <p>Note that this method is security checked
|
duke@0
|
328 |
* and is not available to (for example) untrusted applets.
|
duke@0
|
329 |
* More specifically, if there is a security manager,
|
duke@0
|
330 |
* its <code>checkPropertiesAccess</code>
|
duke@0
|
331 |
* method is called. This could result in a SecurityException.
|
duke@0
|
332 |
*
|
duke@0
|
333 |
* @param isDesignTime True if we're in an application builder tool.
|
duke@0
|
334 |
* @exception SecurityException if a security manager exists and its
|
duke@0
|
335 |
* <code>checkPropertiesAccess</code> method doesn't allow setting
|
duke@0
|
336 |
* of system properties.
|
duke@0
|
337 |
* @see SecurityManager#checkPropertiesAccess
|
duke@0
|
338 |
*/
|
duke@0
|
339 |
|
duke@0
|
340 |
public static void setDesignTime(boolean isDesignTime)
|
duke@0
|
341 |
throws SecurityException {
|
duke@0
|
342 |
SecurityManager sm = System.getSecurityManager();
|
duke@0
|
343 |
if (sm != null) {
|
duke@0
|
344 |
sm.checkPropertiesAccess();
|
duke@0
|
345 |
}
|
malenkov@1077
|
346 |
AppContext.getAppContext().put(DESIGN_TIME, Boolean.valueOf(isDesignTime));
|
duke@0
|
347 |
}
|
duke@0
|
348 |
|
duke@0
|
349 |
/**
|
duke@0
|
350 |
* Used to indicate whether of not we are running in an environment
|
duke@0
|
351 |
* where GUI interaction is available.
|
duke@0
|
352 |
*
|
duke@0
|
353 |
* <p>Note that this method is security checked
|
duke@0
|
354 |
* and is not available to (for example) untrusted applets.
|
duke@0
|
355 |
* More specifically, if there is a security manager,
|
duke@0
|
356 |
* its <code>checkPropertiesAccess</code>
|
duke@0
|
357 |
* method is called. This could result in a SecurityException.
|
duke@0
|
358 |
*
|
duke@0
|
359 |
* @param isGuiAvailable True if GUI interaction is available.
|
duke@0
|
360 |
* @exception SecurityException if a security manager exists and its
|
duke@0
|
361 |
* <code>checkPropertiesAccess</code> method doesn't allow setting
|
duke@0
|
362 |
* of system properties.
|
duke@0
|
363 |
* @see SecurityManager#checkPropertiesAccess
|
duke@0
|
364 |
*/
|
duke@0
|
365 |
|
duke@0
|
366 |
public static void setGuiAvailable(boolean isGuiAvailable)
|
duke@0
|
367 |
throws SecurityException {
|
duke@0
|
368 |
SecurityManager sm = System.getSecurityManager();
|
duke@0
|
369 |
if (sm != null) {
|
duke@0
|
370 |
sm.checkPropertiesAccess();
|
duke@0
|
371 |
}
|
malenkov@1077
|
372 |
AppContext.getAppContext().put(GUI_AVAILABLE, Boolean.valueOf(isGuiAvailable));
|
duke@0
|
373 |
}
|
duke@0
|
374 |
}
|
duke@0
|
375 |
|
duke@0
|
376 |
/**
|
duke@0
|
377 |
* This subclass of ObjectInputStream delegates loading of classes to
|
duke@0
|
378 |
* an existing ClassLoader.
|
duke@0
|
379 |
*/
|
duke@0
|
380 |
|
duke@0
|
381 |
class ObjectInputStreamWithLoader extends ObjectInputStream
|
duke@0
|
382 |
{
|
duke@0
|
383 |
private ClassLoader loader;
|
duke@0
|
384 |
|
duke@0
|
385 |
/**
|
duke@0
|
386 |
* Loader must be non-null;
|
duke@0
|
387 |
*/
|
duke@0
|
388 |
|
duke@0
|
389 |
public ObjectInputStreamWithLoader(InputStream in, ClassLoader loader)
|
duke@0
|
390 |
throws IOException, StreamCorruptedException {
|
duke@0
|
391 |
|
duke@0
|
392 |
super(in);
|
duke@0
|
393 |
if (loader == null) {
|
duke@0
|
394 |
throw new IllegalArgumentException("Illegal null argument to ObjectInputStreamWithLoader");
|
duke@0
|
395 |
}
|
duke@0
|
396 |
this.loader = loader;
|
duke@0
|
397 |
}
|
duke@0
|
398 |
|
duke@0
|
399 |
/**
|
duke@0
|
400 |
* Use the given ClassLoader rather than using the system class
|
duke@0
|
401 |
*/
|
duke@0
|
402 |
protected Class resolveClass(ObjectStreamClass classDesc)
|
duke@0
|
403 |
throws IOException, ClassNotFoundException {
|
duke@0
|
404 |
|
duke@0
|
405 |
String cname = classDesc.getName();
|
duke@0
|
406 |
return ClassFinder.resolveClass(cname, this.loader);
|
duke@0
|
407 |
}
|
duke@0
|
408 |
}
|
duke@0
|
409 |
|