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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package javax.swing.text.html; | |
| 26 | + | |
| 27 | +import java.util.Enumeration; | |
| 28 | +import java.awt.*; | |
| 29 | +import javax.swing.*; | |
| 30 | +import javax.swing.text.*; | |
| 31 | +import java.beans.*; | |
| 32 | +import java.lang.reflect.*; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Component decorator that implements the view interface | |
| 36 | + * for <object> elements. | |
| 37 | + * <p> | |
| 38 | + * This view will try to load the class specified by the | |
| 39 | + * <code>classid</code> attribute. If possible, the Classloader | |
| 40 | + * used to load the associated Document is used. | |
| 41 | + * This would typically be the same as the ClassLoader | |
| 42 | + * used to load the EditorKit. If the document's | |
| 43 | + * ClassLoader is null, <code>Class.forName</code> is used. | |
| 44 | + * <p> | |
| 45 | + * If the class can successfully be loaded, an attempt will | |
| 46 | + * be made to create an instance of it by calling | |
| 47 | + * <code>Class.newInstance</code>. An attempt will be made | |
| 48 | + * to narrow the instance to type <code>java.awt.Component</code> | |
| 49 | + * to display the object. | |
| 50 | + * <p> | |
| 51 | + * This view can also manage a set of parameters with limitations. | |
| 52 | + * The parameters to the <object> element are expected to | |
| 53 | + * be present on the associated elements attribute set as simple | |
| 54 | + * strings. Each bean property will be queried as a key on | |
| 55 | + * the AttributeSet, with the expectation that a non-null value | |
| 56 | + * (of type String) will be present if there was a parameter | |
| 57 | + * specification for the property. Reflection is used to | |
| 58 | + * set the parameter. Currently, this is limited to a very | |
| 59 | + * simple single parameter of type String. | |
| 60 | + * <p> | |
| 61 | + * A simple example HTML invocation is: | |
| 62 | + * <pre> | |
| 63 | + * <object classid="javax.swing.JLabel"> | |
| 64 | + * <param name="text" value="sample text"> | |
| 65 | + * </object> | |
| 66 | + * </pre> | |
| 67 | + * | |
| 68 | + * @author Timothy Prinzing | |
| 69 | + */ | |
| 70 | +public class ObjectView extends ComponentView { | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Creates a new ObjectView object. | |
| 74 | + * | |
| 75 | + * @param elem the element to decorate | |
| 76 | + */ | |
| 77 | + public ObjectView(Element elem) { | |
| 78 | + super(elem); | |
| 79 | + } | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * Create the component. The classid is used | |
| 83 | + * as a specification of the classname, which | |
| 84 | + * we try to load. | |
| 85 | + */ | |
| 86 | + protected Component createComponent() { | |
| 87 | + AttributeSet attr = getElement().getAttributes(); | |
| 88 | + String classname = (String) attr.getAttribute(HTML.Attribute.CLASSID); | |
| 89 | + try { | |
| 90 | + Class c = Class.forName(classname, true,Thread.currentThread(). | |
| 91 | + getContextClassLoader()); | |
| 92 | + Object o = c.newInstance(); | |
| 93 | + if (o instanceof Component) { | |
| 94 | + Component comp = (Component) o; | |
| 95 | + setParameters(comp, attr); | |
| 96 | + return comp; | |
| 97 | + } | |
| 98 | + } catch (Throwable e) { | |
| 99 | + // couldn't create a component... fall through to the | |
| 100 | + // couldn't load representation. | |
| 101 | + } | |
| 102 | + | |
| 103 | + return getUnloadableRepresentation(); | |
| 104 | + } | |
| 105 | + | |
| 106 | + /** | |
| 107 | + * Fetch a component that can be used to represent the | |
| 108 | + * object if it can't be created. | |
| 109 | + */ | |
| 110 | + Component getUnloadableRepresentation() { | |
| 111 | + // PENDING(prinz) get some artwork and return something | |
| 112 | + // interesting here. | |
| 113 | + Component comp = new JLabel("??"); | |
| 114 | + comp.setForeground(Color.red); | |
| 115 | + return comp; | |
| 116 | + } | |
| 117 | + | |
| 118 | + /** | |
| 119 | + * Get a Class object to use for loading the | |
| 120 | + * classid. If possible, the Classloader | |
| 121 | + * used to load the associated Document is used. | |
| 122 | + * This would typically be the same as the ClassLoader | |
| 123 | + * used to load the EditorKit. If the documents | |
| 124 | + * ClassLoader is null, | |
| 125 | + * <code>Class.forName</code> is used. | |
| 126 | + */ | |
| 127 | + private Class getClass(String classname) throws ClassNotFoundException { | |
| 128 | + Class klass; | |
| 129 | + | |
| 130 | + Class docClass = getDocument().getClass(); | |
| 131 | + ClassLoader loader = docClass.getClassLoader(); | |
| 132 | + if (loader != null) { | |
| 133 | + klass = loader.loadClass(classname); | |
| 134 | + } else { | |
| 135 | + klass = Class.forName(classname); | |
| 136 | + } | |
| 137 | + return klass; | |
| 138 | + } | |
| 139 | + | |
| 140 | + /** | |
| 141 | + * Initialize this component according the KEY/VALUEs passed in | |
| 142 | + * via the <param> elements in the corresponding | |
| 143 | + * <object> element. | |
| 144 | + */ | |
| 145 | + private void setParameters(Component comp, AttributeSet attr) { | |
| 146 | + Class k = comp.getClass(); | |
| 147 | + BeanInfo bi; | |
| 148 | + try { | |
| 149 | + bi = Introspector.getBeanInfo(k); | |
| 150 | + } catch (IntrospectionException ex) { | |
| 151 | + System.err.println("introspector failed, ex: "+ex); | |
| 152 | + return; // quit for now | |
| 153 | + } | |
| 154 | + PropertyDescriptor props[] = bi.getPropertyDescriptors(); | |
| 155 | + for (int i=0; i < props.length; i++) { | |
| 156 | + // System.err.println("checking on props[i]: "+props[i].getName()); | |
| 157 | + Object v = attr.getAttribute(props[i].getName()); | |
| 158 | + if (v instanceof String) { | |
| 159 | + // found a property parameter | |
| 160 | + String value = (String) v; | |
| 161 | + Method writer = props[i].getWriteMethod(); | |
| 162 | + if (writer == null) { | |
| 163 | + // read-only property. ignore | |
| 164 | + return; // for now | |
| 165 | + } | |
| 166 | + Class[] params = writer.getParameterTypes(); | |
| 167 | + if (params.length != 1) { | |
| 168 | + // zero or more than one argument, ignore | |
| 169 | + return; // for now | |
| 170 | + } | |
| 171 | + Object [] args = { value }; | |
| 172 | + try { | |
| 173 | + writer.invoke(comp, args); | |
| 174 | + } catch (Exception ex) { | |
| 175 | + System.err.println("Invocation failed"); | |
| 176 | + // invocation code | |
| 177 | + } | |
| 178 | + } | |
| 179 | + } | |
| 180 | + } | |
| 181 | + | |
| 182 | +} | |