| /* |
| * Copyright (c) 1998, 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 javax.swing.text.html; |
| |
| import java.util.Enumeration; |
| import java.awt.*; |
| import javax.swing.*; |
| import javax.swing.text.*; |
| import java.beans.*; |
| import java.lang.reflect.*; |
| |
| import sun.reflect.misc.MethodUtil; |
| import sun.reflect.misc.ReflectUtil; |
| |
| /** |
| * Component decorator that implements the view interface |
| * for <object> elements. |
| * <p> |
| * This view will try to load the class specified by the |
| * <code>classid</code> attribute. If possible, the Classloader |
| * used to load the associated Document is used. |
| * This would typically be the same as the ClassLoader |
| * used to load the EditorKit. If the document's |
| * ClassLoader is null, <code>Class.forName</code> is used. |
| * <p> |
| * If the class can successfully be loaded, an attempt will |
| * be made to create an instance of it by calling |
| * <code>Class.newInstance</code>. An attempt will be made |
| * to narrow the instance to type <code>java.awt.Component</code> |
| * to display the object. |
| * <p> |
| * This view can also manage a set of parameters with limitations. |
| * The parameters to the <object> element are expected to |
| * be present on the associated elements attribute set as simple |
| * strings. Each bean property will be queried as a key on |
| * the AttributeSet, with the expectation that a non-null value |
| * (of type String) will be present if there was a parameter |
| * specification for the property. Reflection is used to |
| * set the parameter. Currently, this is limited to a very |
| * simple single parameter of type String. |
| * <p> |
| * A simple example HTML invocation is: |
| * <pre> |
| * <object classid="javax.swing.JLabel"> |
| * <param name="text" value="sample text"> |
| * </object> |
| * </pre> |
| * |
| * @author Timothy Prinzing |
| */ |
| public class ObjectView extends ComponentView { |
| |
| /** |
| * Creates a new ObjectView object. |
| * |
| * @param elem the element to decorate |
| */ |
| public ObjectView(Element elem) { |
| super(elem); |
| } |
| |
| /** |
| * Create the component. The classid is used |
| * as a specification of the classname, which |
| * we try to load. |
| */ |
| protected Component createComponent() { |
| AttributeSet attr = getElement().getAttributes(); |
| String classname = (String) attr.getAttribute(HTML.Attribute.CLASSID); |
| try { |
| ReflectUtil.checkPackageAccess(classname); |
| Class c = Class.forName(classname, true,Thread.currentThread(). |
| getContextClassLoader()); |
| Object o = c.newInstance(); |
| if (o instanceof Component) { |
| Component comp = (Component) o; |
| setParameters(comp, attr); |
| return comp; |
| } |
| } catch (Throwable e) { |
| // couldn't create a component... fall through to the |
| // couldn't load representation. |
| } |
| |
| return getUnloadableRepresentation(); |
| } |
| |
| /** |
| * Fetch a component that can be used to represent the |
| * object if it can't be created. |
| */ |
| Component getUnloadableRepresentation() { |
| // PENDING(prinz) get some artwork and return something |
| // interesting here. |
| Component comp = new JLabel("??"); |
| comp.setForeground(Color.red); |
| return comp; |
| } |
| |
| /** |
| * Initialize this component according the KEY/VALUEs passed in |
| * via the <param> elements in the corresponding |
| * <object> element. |
| */ |
| private void setParameters(Component comp, AttributeSet attr) { |
| Class k = comp.getClass(); |
| BeanInfo bi; |
| try { |
| bi = Introspector.getBeanInfo(k); |
| } catch (IntrospectionException ex) { |
| System.err.println("introspector failed, ex: "+ex); |
| return; // quit for now |
| } |
| PropertyDescriptor props[] = bi.getPropertyDescriptors(); |
| for (int i=0; i < props.length; i++) { |
| // System.err.println("checking on props[i]: "+props[i].getName()); |
| Object v = attr.getAttribute(props[i].getName()); |
| if (v instanceof String) { |
| // found a property parameter |
| String value = (String) v; |
| Method writer = props[i].getWriteMethod(); |
| if (writer == null) { |
| // read-only property. ignore |
| return; // for now |
| } |
| Class[] params = writer.getParameterTypes(); |
| if (params.length != 1) { |
| // zero or more than one argument, ignore |
| return; // for now |
| } |
| Object [] args = { value }; |
| try { |
| MethodUtil.invoke(writer, comp, args); |
| } catch (Exception ex) { |
| System.err.println("Invocation failed"); |
| // invocation code |
| } |
| } |
| } |
| } |
| |
| } |