126 lines
5.5 KiB
Java
126 lines
5.5 KiB
Java
/*
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* Copyright (c) 1996, 2011, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.beans;
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/**
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* The PropertyEditorManager can be used to locate a property editor for
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* any given type name. This property editor must support the
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* java.beans.PropertyEditor interface for editing a given object.
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* <P>
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* The PropertyEditorManager uses three techniques for locating an editor
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* for a given type. First, it provides a registerEditor method to allow
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* an editor to be specifically registered for a given type. Second it
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* tries to locate a suitable class by adding "Editor" to the full
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* qualified classname of the given type (e.g. "foo.bah.FozEditor").
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* Finally it takes the simple classname (without the package name) adds
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* "Editor" to it and looks in a search-path of packages for a matching
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* class.
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* <P>
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* So for an input class foo.bah.Fred, the PropertyEditorManager would
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* first look in its tables to see if an editor had been registered for
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* foo.bah.Fred and if so use that. Then it will look for a
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* foo.bah.FredEditor class. Then it will look for (say)
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* standardEditorsPackage.FredEditor class.
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* <p>
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* Default PropertyEditors will be provided for the Java primitive types
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* "boolean", "byte", "short", "int", "long", "float", and "double"; and
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* for the classes java.lang.String. java.awt.Color, and java.awt.Font.
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*/
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public class PropertyEditorManager {
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/**
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* Registers an editor class to edit values of the given target class.
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* If the editor class is {@code null},
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* then any existing definition will be removed.
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* Thus this method can be used to cancel the registration.
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* The registration is canceled automatically
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* if either the target or editor class is unloaded.
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* <p>
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* If there is a security manager, its {@code checkPropertiesAccess}
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* method is called. This could result in a {@linkplain SecurityException}.
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*
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* @param targetType the class object of the type to be edited
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* @param editorClass the class object of the editor class
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* @throws SecurityException if a security manager exists and
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* its {@code checkPropertiesAccess} method
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* doesn't allow setting of system properties
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*
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* @see SecurityManager#checkPropertiesAccess
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*/
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public static void registerEditor(Class<?> targetType, Class<?> editorClass) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkPropertiesAccess();
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}
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ThreadGroupContext.getContext().getPropertyEditorFinder().register(targetType, editorClass);
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}
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/**
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* Locate a value editor for a given target type.
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*
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* @param targetType The Class object for the type to be edited
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* @return An editor object for the given target class.
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* The result is null if no suitable editor can be found.
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*/
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public static PropertyEditor findEditor(Class<?> targetType) {
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return ThreadGroupContext.getContext().getPropertyEditorFinder().find(targetType);
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}
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/**
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* Gets the package names that will be searched for property editors.
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*
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* @return The array of package names that will be searched in
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* order to find property editors.
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* <p> The default value for this array is implementation-dependent,
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* e.g. Sun implementation initially sets to {"sun.beans.editors"}.
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*/
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public static String[] getEditorSearchPath() {
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return ThreadGroupContext.getContext().getPropertyEditorFinder().getPackages();
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}
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/**
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* Change the list of package names that will be used for
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* finding property editors.
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*
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* <p>First, if there is a security manager, 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 path Array of package names.
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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 setEditorSearchPath(String[] path) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkPropertiesAccess();
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}
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ThreadGroupContext.getContext().getPropertyEditorFinder().setPackages(path);
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}
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}
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