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Use the standard Linux GPIO api from Java

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/*
 * Copyright 2018 Adam Helinski
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package io.dvlopt.linux.gpio ;


import com.sun.jna.Memory                               ;
import io.dvlopt.linux.gpio.GpioUtils                   ;
import io.dvlopt.linux.gpio.internal.NativeGpioChipInfo ;




/**
 * Class holding information about a GPIO device.
 */
public class GpioChipInfo {


    // Pointer to the native structure.
    //
    final Memory memory ;




    /**
     * Basic constructor
     */
    public GpioChipInfo() {
    
        this.memory = new Memory( NativeGpioChipInfo.SIZE ) ;

        this.memory.clear() ;
    }




    /**
     * Retrieves the label of this GPIO device.
     *
     * @return String acting as a label or null.
     */
    public String getLabel() {

        return GpioUtils.getString( this.memory                     ,
                                    NativeGpioChipInfo.OFFSET_LABEL ) ;
    }




    /**
     * Retrieves how many lines this GPIO device can handle, at most 64.
     *
     * @return The number of lines.
     */
    public int getLines() {
    
        return this.memory.getInt( NativeGpioChipInfo.OFFSET_LINES ) ;
    }




    /**
     * Retrieves the name of this GPIO device.
     *
     * @return String representing the name or null.
     */
    public String getName() {
    
        return GpioUtils.getString( this.memory                    ,
                                    NativeGpioChipInfo.OFFSET_NAME ) ;
    }
}