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Tom Tromey
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libjava/classpath/java/beans/PropertyEditorManager.java
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libjava/classpath/java/beans/PropertyEditorManager.java
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/* java.beans.PropertyEditorManager
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.beans;
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import gnu.java.beans.editors.ColorEditor;
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import gnu.java.beans.editors.FontEditor;
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import gnu.java.beans.editors.NativeBooleanEditor;
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import gnu.java.beans.editors.NativeByteEditor;
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import gnu.java.beans.editors.NativeDoubleEditor;
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import gnu.java.beans.editors.NativeFloatEditor;
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import gnu.java.beans.editors.NativeIntEditor;
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import gnu.java.beans.editors.NativeLongEditor;
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import gnu.java.beans.editors.NativeShortEditor;
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import gnu.java.beans.editors.StringEditor;
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import gnu.java.lang.ClassHelper;
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import java.awt.Color;
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import java.awt.Font;
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/**
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* PropertyEditorManager is used to find property editors
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* for various types (not necessarily Beans).<P>
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*
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* It first checks to see if the property editor is
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* already registered; if it is, that property editor is
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* used. Next it takes the type's classname and appends
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* "Editor" to it, and searches first in the class's
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* package and then in the property editor search path.
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*
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* <p>Default property editors are provided for:</p>
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*
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* <ol>
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* <li>boolean, byte, short, int, long, float, and double</li>
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* <li>java.lang.String</li>
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* <li>java.awt.Color</li>
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* <li>java.awt.Font</li>
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* </ol>
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*
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* <p><strong>Spec Suggestion:</strong> Perhaps an editor for
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* Filename or something like it should be provided. As well
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* as char.</p>
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*
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* @author John Keiser
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* @since 1.1
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* @version 1.1.0, 29 Jul 1998
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*/
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public class PropertyEditorManager
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{
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static java.util.Hashtable editors = new java.util.Hashtable();
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static String[] editorSearchPath = { "gnu.java.beans.editors",
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"sun.beans.editors" };
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static
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{
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registerEditor(Boolean.TYPE, NativeBooleanEditor.class);
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registerEditor(Byte.TYPE, NativeByteEditor.class);
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registerEditor(Short.TYPE, NativeShortEditor.class);
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registerEditor(Integer.TYPE, NativeIntEditor.class);
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registerEditor(Long.TYPE, NativeLongEditor.class);
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registerEditor(Float.TYPE, NativeFloatEditor.class);
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registerEditor(Double.TYPE, NativeDoubleEditor.class);
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registerEditor(String.class, StringEditor.class);
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registerEditor(Color.class, ColorEditor.class);
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registerEditor(Font.class, FontEditor.class);
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}
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/**
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* Beats me why this class can be instantiated, but there
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* you have it.
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*/
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public PropertyEditorManager()
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{
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// Do nothing here
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}
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/**
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* Register an editor for a class. Replaces old editor
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* if there was one registered before.
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*
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* @param editedClass the class that the property editor
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* will edit.
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* @param editorClass the PropertyEditor class.
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*/
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public static void registerEditor(Class editedClass, Class editorClass)
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{
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editors.put(editedClass, editorClass);
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}
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/**
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* Returns a new instance of the property editor for the
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* specified class.
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*
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* @param editedClass the class that the property editor
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* will edit.
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* @return a PropertyEditor instance that can edit the
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* specified class.
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*/
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public static PropertyEditor findEditor(Class editedClass)
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{
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try
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{
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Class found = (Class)editors.get(editedClass);
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if(found != null)
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{
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return (PropertyEditor)found.newInstance();
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}
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ClassLoader contextClassLoader
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= Thread.currentThread().getContextClassLoader();
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try
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{
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found = Class.forName(editedClass.getName()+"Editor", true,
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contextClassLoader);
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registerEditor(editedClass,found);
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return (PropertyEditor)found.newInstance();
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}
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catch(ClassNotFoundException E)
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{
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}
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String appendName
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= "."
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+ ClassHelper.getTruncatedClassName(editedClass)
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+ "Editor";
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synchronized(editorSearchPath)
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{
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for(int i=0;i<editorSearchPath.length;i++)
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{
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try
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{
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found = Class.forName(editorSearchPath[i] + appendName,
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true, contextClassLoader);
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registerEditor(editedClass,found);
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return (PropertyEditor)found.newInstance();
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}
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catch(ClassNotFoundException E)
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{
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}
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}
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}
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}
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catch(InstantiationException E)
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{
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}
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catch(IllegalAccessException E)
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{
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}
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return null;
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}
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/**
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* Get the editor search path.
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* As a minor departure from the spec, the default value
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* for the editor search path is "gnu.java.beans.editors",
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* "sun.beans.editors".
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*
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* @return the editor search path.
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*/
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public static String[] getEditorSearchPath()
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{
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return editorSearchPath;
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}
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/**
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* Set the editor search path.
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*
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* @param editorSearchPath the new value for the editor search path.
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*/
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public static void setEditorSearchPath(String[] editorSearchPath)
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{
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synchronized(editorSearchPath)
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{
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PropertyEditorManager.editorSearchPath = editorSearchPath;
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}
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}
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}
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