observer.java

来自「270的linux说明」· Java 代码 · 共 80 行

/*

Copyright (c) 2008, Intel Corporation. 

All rights reserved.

 

Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:


    * Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation and/or 
other materials provided with the distribution.

    * Neither the name of Intel Corporation nor the names of its contributors 
may be used to endorse or promote products derived from this software without 
specific prior written permission.

 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.

*/

package com.intel.mobile.base;

/**
 * This specifies the abstract base class for all observers.
 * To be notified of an event, the programmer:
 * <li>Derives a class from <b>Observer</b>.</li>
 * <li>Provides an implementation for the <b>notify()</b> method.</li>
 * <li>Uses the <b>EventProperty</b>'s or <b>Threshold</b>'s <b>addObserver()</b> method to register for an event.</li>
 */
public abstract class Observer
{
    //private long nativeObjRef;
    protected long nativeObjRef;
    
    static
    {
        System.loadLibrary("IntelMobileJNI11");
    }
    
    // Default Constructor
    protected Observer()
    {
        constructor();
    }
    
    /**
     * This method is to release the native resource and make itself can be collected by GC.
     * Applications are required to invoke this method explicitly when the observer object is not used any more.
     * @throws IntelMobileException
     */
    public native void Close() throws IntelMobileException;
    
    /**
     * The only method that the derived observer object need to implement.
     * It is called when the event is fired.
     * @param event The Event object is not persistent outside the scope of this method.
     */
    public abstract void Notify(Event event);
    
    private native void constructor();
}