/*
* Copyright (c) 2000, 2001, 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.
*
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*/
package com.sun.java.browser.dom;
public abstract class DOMService
{
/**
* Returns new instance of a DOMService. The implementation
* of the DOMService returns depends on the setting of the
* com.sun.java.browser.dom.DOMServiceProvider property or,
* if the property is not set, a platform specific default.
*
* Throws DOMUnsupportedException if the DOMService is not
* available to the obj.
*
* @param obj Object to leverage the DOMService
*/
public static DOMService getService(Object obj)
throws DOMUnsupportedException
{
try
{
String provider = (String) java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction("com.sun.java.browser.dom.DOMServiceProvider"));
Class clazz = DOMService.class.forName("sun.plugin.dom.DOMService");
return (DOMService) clazz.newInstance();
}
catch (Throwable e)
{
throw new DOMUnsupportedException(e.toString());
}
}
/**
* An empty constructor is provided. Implementations of this
* abstract class must provide a public no-argument constructor
* in order for the static getService() method to work correctly.
* Application programmers should not be able to directly
* construct implementation subclasses of this abstract subclass.
*/
public DOMService()
{
}
/**
* Causes action.run() to be executed synchronously on the
* DOM action dispatching thread. This call will block until all
* pending DOM actions have been processed and (then)
* action.run() returns. This method should be used when an
* application thread needs to access the browser's DOM.
* It should not be called from the DOMActionDispatchThread.
*
* Note that if the DOMAction.run() method throws an uncaught
* exception (on the DOM action dispatching thread), it's caught
* and re-thrown, as an DOMAccessException, on the caller's thread.
*
* If the DOMAction.run() method throws any DOM security related
* exception (on the DOM action dispatching thread), it's caught
* and re-thrown, as an DOMSecurityException, on the caller's thread.
*
* @param action DOMAction.
*/
public abstract Object invokeAndWait(DOMAction action) throws DOMAccessException;
/**
* Causes action.run() to be executed asynchronously on the
* DOM action dispatching thread. This method should be used
* when an application thread needs to access the browser's
* DOM. It should not be called from the DOMActionDispatchThread.
*
* Note that if the DOMAction.run() method throws an uncaught
* exception (on the DOM action dispatching thread), it will not be
* caught and re-thrown on the caller's thread.
*
* @param action DOMAction.
*/
public abstract void invokeLater(DOMAction action);
}