instancecollection.java

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/*

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;

/**
 * Base class for all instance collections which apply the enumerator/iterator pattern. 
 */
public abstract class InstanceCollection extends Object
{
    /**
     * Judge if it has more element (instance object) in this enumerator/iterator.
     * @return true if next() would return an element rather than throwing exception.
     * @throws IntelMobileException
     */
    public boolean HasNext() throws IntelMobileException
    {
        return HasNextNative();
    }
    
    /**
     * Set this enumerator/iterator to its initial position, that is, before the first element. 
     * @throws IntelMobileException
     */
    public void Reset() throws IntelMobileException
    {
        ResetNative();
    }
    
    /**
     * Move to the next element and return it if HasNext() returns true.
     * Otherwise throw InvalidOperationException which is derived from IntelMobileException.
     * @return Specific instance object which is implemented by the derived class. Need to cast.
     * @throws IntelMobileException
     */
    public abstract InstanceObject Next() throws IntelMobileException;
    
    /**
     * Get the current element if the position is not before the first nor after the last.
     * Otherwise throw InvalidOperationException which is derived from IntelMobileException.
     * @return Specific instance object which is implemented by the derived class. Need to cast.
     * @throws IntelMobileException
     */
    public abstract InstanceObject Current() throws IntelMobileException;
    
    private native boolean HasNextNative() throws IntelMobileException;
    private native void ResetNative() throws IntelMobileException;
}