/*
* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:
*
*/
package com.nokia.mj.impl.rt.support;
import com.nokia.mj.impl.rt.JvmPort;
/**
* Provides JVM utilities for Java API implementations to use. Some of these
* utilities hide differences between CLDC and CDC configurations and some
* provide completely non-standard access to JVM features and to process memory.
*<p>
* Example how to load a system library
* <pre>
* package com.nokia.mj.impl.mypackage;
*
* import com.nokia.mj.impl.rt.support;
* public void myClass()
* {
* public void myMethod()
* {
* //loads the system library.
* Jvm.loadSystemLibrary("my_system_library");
*
* //my implementation...
* }
* }
*</pre>
* @author Nokia Corporation
* @version 1.0
*/
public class Jvm
{
/**
* Loads the system library specified by the libName argument.
* <p>
* This method uses <code>System.loadLibrary</code> in CDC based
* configuration while in CLDC a proprieatary API is used.
* @param libName The name of the library.
*/
public static void loadSystemLibrary(String libName)
{
JvmPort.getInstance().loadSystemLibrary(libName);
}
/**
* JAVADOCS ARE UNDER CONSTRUCTION!!
* <p>
* Returns the Class object associated with the class or interface with the
* given string name.
* @param name A fully qualified name of the desired class.
* @return class object representing the desired class .
*/
public static Class loadApplicationClass(String name)
throws ClassNotFoundException
{
return JvmPort.getInstance().loadApplicationClass(name);
}
/**
* Marks the given thread as either a daemon thread or a user thread
* This can only be done before the Thread starts running.
* @param thread The thread to be modified.
* @param daemon If true, marks the given thread as a daemon thread.
* @throws IllegalThreadStateException if the Thread has already been
* started.
* @throws SecurityException if the caller is not in the boot class path.
*/
public static void setThreadAsDaemon(Thread thread, boolean daemon)
throws IllegalThreadStateException, SecurityException
{
JvmPort.getInstance().setThreadAsDaemon(thread, daemon);
}
/**
* JAVADOCS ARE UNDER CONSTRUCTION!!
* <p>
* Gets a NativeMemoryBlock. NativeMemoryBlock provids a way
* read the whole content of resource in jar file into native memory
* buffer. The content is not copien into Java side - only pointer
* and size of the data is usable in the Java side.
*
* @param jarPath If jarPath is null then the resource is searched from
* the classpath - like in normal class.getResourceAsStream. If it is
* provided then it can be any Jar file availble in the file system.
* @param resName Name of the desired resource
*
* @return NativeMemoryBlock instance if resource is found, otherwise null.
*/
public static NativeMemoryBlock getResourceAsNativeMemory(String jarPath,
String resName)
{
return JvmPort.getInstance().getResourceAsNativeMemory(jarPath, resName);
}
}