cdcmidletloader.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 103 行

/*
 * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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.
 * 
 * This program 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 at /legal/license.txt).
 * 
 * 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
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */

package com.sun.midp.main;

import javax.microedition.midlet.*;

import com.sun.midp.midlet.*;

import com.sun.midp.midletsuite.*;

import sun.misc.*;
import java.net.*;

/**
 * The class implements the MIDlet loader for the CLDC VM.
 */
public class CdcMIDletLoader implements MIDletLoader {
    /** Reference to the MIDlet suite storage object. */
    private MIDletSuiteStorage midletSuiteStorage;

    /**
     * Initializes this object.
     *
     * @param mss the MIDlet suite storage
     *
     */
    public CdcMIDletLoader(MIDletSuiteStorage mss) {
        midletSuiteStorage = mss;
    }

    /**
     * Loads a MIDlet from a suite's JAR.
     *
     * @param suite reference to the suite
     * @param className class name of the MIDlet to be created
     *
     * @return new instance of a MIDlet
     *
     * @exception ClassNotFoundException if the MIDlet class is
     * not found
     * @exception InstantiationException if the MIDlet cannot be
     * created or is not subclass of MIDlet
     * @exception IllegalAccessException if the MIDlet is not
     * permitted to perform a specific operation
     */
    public MIDlet newInstance(MIDletSuite suite, String className) throws
           ClassNotFoundException, InstantiationException,
           IllegalAccessException {

        boolean hideCdcClasses = true;
        String[] jars;
        MIDletClassLoader  midletClassLoader;
        Class midletClass;

        if (suite.getID() == -1) {
            /* The suite is not installed, rommized or WTK created JAR. */
            jars = MIDPLauncher.getMidletSuitePath();

            if (jars == null || jars.length == 0) {
                /* This is a rommized internal MIDlet, that has no JAR. */
                hideCdcClasses = false;
            }
        } else {
            jars = midletSuiteStorage.
                       getMidletSuiteClassPath(suite.getID());
        }

        /* Use MIDletClassLoader to load the main midlet class. */
        midletClassLoader =
            MIDPConfig.newMIDletClassLoader(jars, hideCdcClasses, null);

        midletClass = midletClassLoader.loadClass(className);

        if (!MIDlet.class.isAssignableFrom(midletClass)) {
            throw new InstantiationException("Class not a MIDlet");
        }

        return (MIDlet)midletClass.newInstance();
    }
}