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/*
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* Copyright 1996-2006 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.applet.*;
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import java.awt.*;
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import java.beans.AppletInitializer;
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import java.beans.beancontext.BeanContext;
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import java.io.*;
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import java.lang.reflect.Constructor;
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import java.net.URL;
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import java.lang.reflect.Array;
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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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/**
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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 java.lang.ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception java.io.IOException if an I/O error occurs.
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*/
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public static Object instantiate(ClassLoader cls, String beanName) throws java.io.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 java.lang.ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception java.io.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 java.io.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 java.lang.ClassNotFoundException if the class of a serialized
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* object could not be found.
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* @exception java.io.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, AppletInitializer initializer)
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throws java.io.IOException, ClassNotFoundException {
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java.io.InputStream ins;
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java.io.ObjectInputStream oins = null;
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Object result = null;
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boolean serialized = false;
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java.io.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)java.security.AccessController.doPrivileged
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(new java.security.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 (java.io.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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AppletStub stub = null;
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if (result instanceof Applet) {
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Applet applet = (Applet) result;
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boolean needDummies = initializer == null;
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if (needDummies) {
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// Figure our the codebase and docbase URLs. We do this
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// by locating the URL for a known resource, and then
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// massaging the URL.
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// First find the "resource name" corresponding to the bean
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// itself. So a serialzied bean "a.b.c" would imply a
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// resource name of "a/b/c.ser" and a classname of "x.y"
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// would imply a resource name of "x/y.class".
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final String resourceName;
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if (serialized) {
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// Serialized bean
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resourceName = beanName.replace('.','/').concat(".ser");
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} else {
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// Regular class
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resourceName = beanName.replace('.','/').concat(".class");
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}
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URL objectUrl = null;
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URL codeBase = null;
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URL docBase = null;
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// Now get the URL correponding to the resource name.
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final ClassLoader cloader = cls;
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objectUrl = (URL)
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java.security.AccessController.doPrivileged
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(new java.security.PrivilegedAction() {
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public Object run() {
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if (cloader == null)
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return ClassLoader.getSystemResource
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(resourceName);
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else
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return cloader.getResource(resourceName);
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}
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});
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// If we found a URL, we try to locate the docbase by taking
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// of the final path name component, and the code base by taking
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// of the complete resourceName.
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// So if we had a resourceName of "a/b/c.class" and we got an
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// objectURL of "file://bert/classes/a/b/c.class" then we would
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// want to set the codebase to "file://bert/classes/" and the
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// docbase to "file://bert/classes/a/b/"
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if (objectUrl != null) {
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String s = objectUrl.toExternalForm();
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if (s.endsWith(resourceName)) {
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int ix = s.length() - resourceName.length();
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codeBase = new URL(s.substring(0,ix));
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docBase = codeBase;
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ix = s.lastIndexOf('/');
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if (ix >= 0) {
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docBase = new URL(s.substring(0,ix+1));
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}
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}
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}
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// Setup a default context and stub.
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BeansAppletContext context = new BeansAppletContext(applet);
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stub = (AppletStub)new BeansAppletStub(applet, context, codeBase, docBase);
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applet.setStub(stub);
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} else {
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initializer.initialize(applet, beanContext);
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}
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// now, if there is a BeanContext, add the bean, if applicable.
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if (beanContext != null) {
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beanContext.add(result);
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}
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// If it was deserialized then it was already init-ed.
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// Otherwise we need to initialize it.
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if (!serialized) {
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// We need to set a reasonable initial size, as many
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// applets are unhappy if they are started without
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// having been explicitly sized.
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applet.setSize(100,100);
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applet.init();
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}
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if (needDummies) {
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((BeansAppletStub)stub).active = true;
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} else initializer.activate(applet);
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} else if (beanContext != null) beanContext.add(result);
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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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/**
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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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* @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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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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* Test if we are in design-mode.
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*
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* @return True if we are running in an application construction
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* environment.
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*
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* @see java.beans.DesignMode
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*/
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public static boolean isDesignTime() {
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return designTime;
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}
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/**
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* Determines whether beans can assume a GUI is available.
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*
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* @return True if we are running in an environment where beans
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* can assume that an interactive GUI is available, so they
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* can pop up dialog boxes, etc. This will normally return
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* true in a windowing environment, and will normally return
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* false in a server environment or if an application is
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* running as part of a batch job.
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*
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* @see java.beans.Visibility
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*
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*/
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public static boolean isGuiAvailable() {
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return guiAvailable;
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}
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/**
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* Used to indicate whether of not we are running in an application
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* builder environment.
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*
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* <p>Note that this method is security checked
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* and is not available to (for example) untrusted applets.
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* More specifically, if there is a security manager,
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* its <code>checkPropertiesAccess</code>
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* method is called. This could result in a SecurityException.
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*
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* @param isDesignTime True if we're in an application builder tool.
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* @exception SecurityException if a security manager exists and its
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* <code>checkPropertiesAccess</code> method doesn't allow setting
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* of system properties.
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* @see SecurityManager#checkPropertiesAccess
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*/
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public static void setDesignTime(boolean isDesignTime)
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throws SecurityException {
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|
422 |
SecurityManager sm = System.getSecurityManager();
|
|
423 |
if (sm != null) {
|
|
424 |
sm.checkPropertiesAccess();
|
|
425 |
}
|
|
426 |
designTime = isDesignTime;
|
|
427 |
}
|
|
428 |
|
|
429 |
/**
|
|
430 |
* Used to indicate whether of not we are running in an environment
|
|
431 |
* where GUI interaction is available.
|
|
432 |
*
|
|
433 |
* <p>Note that this method is security checked
|
|
434 |
* and is not available to (for example) untrusted applets.
|
|
435 |
* More specifically, if there is a security manager,
|
|
436 |
* its <code>checkPropertiesAccess</code>
|
|
437 |
* method is called. This could result in a SecurityException.
|
|
438 |
*
|
|
439 |
* @param isGuiAvailable True if GUI interaction is available.
|
|
440 |
* @exception SecurityException if a security manager exists and its
|
|
441 |
* <code>checkPropertiesAccess</code> method doesn't allow setting
|
|
442 |
* of system properties.
|
|
443 |
* @see SecurityManager#checkPropertiesAccess
|
|
444 |
*/
|
|
445 |
|
|
446 |
public static void setGuiAvailable(boolean isGuiAvailable)
|
|
447 |
throws SecurityException {
|
|
448 |
SecurityManager sm = System.getSecurityManager();
|
|
449 |
if (sm != null) {
|
|
450 |
sm.checkPropertiesAccess();
|
|
451 |
}
|
|
452 |
guiAvailable = isGuiAvailable;
|
|
453 |
}
|
|
454 |
|
|
455 |
|
|
456 |
private static boolean designTime;
|
|
457 |
private static boolean guiAvailable;
|
|
458 |
static {
|
|
459 |
guiAvailable = !GraphicsEnvironment.isHeadless();
|
|
460 |
}
|
|
461 |
}
|
|
462 |
|
|
463 |
/**
|
|
464 |
* This subclass of ObjectInputStream delegates loading of classes to
|
|
465 |
* an existing ClassLoader.
|
|
466 |
*/
|
|
467 |
|
|
468 |
class ObjectInputStreamWithLoader extends ObjectInputStream
|
|
469 |
{
|
|
470 |
private ClassLoader loader;
|
|
471 |
|
|
472 |
/**
|
|
473 |
* Loader must be non-null;
|
|
474 |
*/
|
|
475 |
|
|
476 |
public ObjectInputStreamWithLoader(InputStream in, ClassLoader loader)
|
|
477 |
throws IOException, StreamCorruptedException {
|
|
478 |
|
|
479 |
super(in);
|
|
480 |
if (loader == null) {
|
|
481 |
throw new IllegalArgumentException("Illegal null argument to ObjectInputStreamWithLoader");
|
|
482 |
}
|
|
483 |
this.loader = loader;
|
|
484 |
}
|
|
485 |
|
|
486 |
/**
|
|
487 |
* Use the given ClassLoader rather than using the system class
|
|
488 |
*/
|
|
489 |
protected Class resolveClass(ObjectStreamClass classDesc)
|
|
490 |
throws IOException, ClassNotFoundException {
|
|
491 |
|
|
492 |
String cname = classDesc.getName();
|
|
493 |
return ClassFinder.resolveClass(cname, this.loader);
|
|
494 |
}
|
|
495 |
}
|
|
496 |
|
|
497 |
/**
|
|
498 |
* Package private support class. This provides a default AppletContext
|
|
499 |
* for beans which are applets.
|
|
500 |
*/
|
|
501 |
|
|
502 |
class BeansAppletContext implements AppletContext {
|
|
503 |
Applet target;
|
|
504 |
java.util.Hashtable imageCache = new java.util.Hashtable();
|
|
505 |
|
|
506 |
BeansAppletContext(Applet target) {
|
|
507 |
this.target = target;
|
|
508 |
}
|
|
509 |
|
|
510 |
public AudioClip getAudioClip(URL url) {
|
|
511 |
// We don't currently support audio clips in the Beans.instantiate
|
|
512 |
// applet context, unless by some luck there exists a URL content
|
|
513 |
// class that can generate an AudioClip from the audio URL.
|
|
514 |
try {
|
|
515 |
return (AudioClip) url.getContent();
|
|
516 |
} catch (Exception ex) {
|
|
517 |
return null;
|
|
518 |
}
|
|
519 |
}
|
|
520 |
|
|
521 |
public synchronized Image getImage(URL url) {
|
|
522 |
Object o = imageCache.get(url);
|
|
523 |
if (o != null) {
|
|
524 |
return (Image)o;
|
|
525 |
}
|
|
526 |
try {
|
|
527 |
o = url.getContent();
|
|
528 |
if (o == null) {
|
|
529 |
return null;
|
|
530 |
}
|
|
531 |
if (o instanceof Image) {
|
|
532 |
imageCache.put(url, o);
|
|
533 |
return (Image) o;
|
|
534 |
}
|
|
535 |
// Otherwise it must be an ImageProducer.
|
|
536 |
Image img = target.createImage((java.awt.image.ImageProducer)o);
|
|
537 |
imageCache.put(url, img);
|
|
538 |
return img;
|
|
539 |
|
|
540 |
} catch (Exception ex) {
|
|
541 |
return null;
|
|
542 |
}
|
|
543 |
}
|
|
544 |
|
|
545 |
public Applet getApplet(String name) {
|
|
546 |
return null;
|
|
547 |
}
|
|
548 |
|
|
549 |
public java.util.Enumeration getApplets() {
|
|
550 |
java.util.Vector applets = new java.util.Vector();
|
|
551 |
applets.addElement(target);
|
|
552 |
return applets.elements();
|
|
553 |
}
|
|
554 |
|
|
555 |
public void showDocument(URL url) {
|
|
556 |
// We do nothing.
|
|
557 |
}
|
|
558 |
|
|
559 |
public void showDocument(URL url, String target) {
|
|
560 |
// We do nothing.
|
|
561 |
}
|
|
562 |
|
|
563 |
public void showStatus(String status) {
|
|
564 |
// We do nothing.
|
|
565 |
}
|
|
566 |
|
|
567 |
public void setStream(String key, InputStream stream)throws IOException{
|
|
568 |
// We do nothing.
|
|
569 |
}
|
|
570 |
|
|
571 |
public InputStream getStream(String key){
|
|
572 |
// We do nothing.
|
|
573 |
return null;
|
|
574 |
}
|
|
575 |
|
|
576 |
public java.util.Iterator getStreamKeys(){
|
|
577 |
// We do nothing.
|
|
578 |
return null;
|
|
579 |
}
|
|
580 |
}
|
|
581 |
|
|
582 |
/**
|
|
583 |
* Package private support class. This provides an AppletStub
|
|
584 |
* for beans which are applets.
|
|
585 |
*/
|
|
586 |
class BeansAppletStub implements AppletStub {
|
|
587 |
transient boolean active;
|
|
588 |
transient Applet target;
|
|
589 |
transient AppletContext context;
|
|
590 |
transient URL codeBase;
|
|
591 |
transient URL docBase;
|
|
592 |
|
|
593 |
BeansAppletStub(Applet target,
|
|
594 |
AppletContext context, URL codeBase,
|
|
595 |
URL docBase) {
|
|
596 |
this.target = target;
|
|
597 |
this.context = context;
|
|
598 |
this.codeBase = codeBase;
|
|
599 |
this.docBase = docBase;
|
|
600 |
}
|
|
601 |
|
|
602 |
public boolean isActive() {
|
|
603 |
return active;
|
|
604 |
}
|
|
605 |
|
|
606 |
public URL getDocumentBase() {
|
|
607 |
// use the root directory of the applet's class-loader
|
|
608 |
return docBase;
|
|
609 |
}
|
|
610 |
|
|
611 |
public URL getCodeBase() {
|
|
612 |
// use the directory where we found the class or serialized object.
|
|
613 |
return codeBase;
|
|
614 |
}
|
|
615 |
|
|
616 |
public String getParameter(String name) {
|
|
617 |
return null;
|
|
618 |
}
|
|
619 |
|
|
620 |
public AppletContext getAppletContext() {
|
|
621 |
return context;
|
|
622 |
}
|
|
623 |
|
|
624 |
public void appletResize(int width, int height) {
|
|
625 |
// we do nothing.
|
|
626 |
}
|
|
627 |
}
|