/**
    * Oshi (https://github.com/dblock/oshi)
    * 
    * Copyright (c) 2010 - 2015 The Oshi Project Team
    * 
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Eclipse Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/epl-v10.html
   * 
   * Contributors:
   * dblock[at]dblock[dot]org
   * alessandro[at]perucchi[dot]org
   * widdis[at]gmail[dot]com
   * https://github.com/dblock/oshi/graphs/contributors
   */
  package oshi.software.os.mac;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import oshi.hardware.HardwareAbstractionLayer;
  import oshi.hardware.Memory;
  import oshi.hardware.PowerSource;
  import oshi.hardware.Processor;
  import oshi.software.os.OSFileStore;
  import oshi.software.os.mac.local.CentralProcessor;
  import oshi.software.os.mac.local.GlobalMemory;
  import oshi.software.os.mac.local.MacFileSystem;
  import oshi.software.os.mac.local.MacPowerSource;
  import oshi.software.os.mac.local.SystemB;
  
  import com.sun.jna.LastErrorException;
  import com.sun.jna.Native;
  import com.sun.jna.ptr.IntByReference;
  
  /**
   * @author alessandro[at]perucchi[dot]org
   * @author widdis[at]gmail[dot]com
   */
  public class MacHardwareAbstractionLayer implements HardwareAbstractionLayer {
  
  	private Processor[] _processors;
  
  	private Memory _memory;
  
  	private PowerSource[] _powerSources;
  
  	/*
  	 * (non-Javadoc)
  	 * 
  	 * @see oshi.hardware.HardwareAbstractionLayer#getProcessors()
  	 */
  	@Override
  	public Processor[] getProcessors() {
  		if (this._processors == null) {
  			int nbCPU = 1;
  			List<Processor> processors = new ArrayList<>();
  			int[] mib = { SystemB.CTL_HW, SystemB.HW_LOGICALCPU };
  			com.sun.jna.Memory pNbCPU = new com.sun.jna.Memory(SystemB.INT_SIZE);
  			if (0 != SystemB.INSTANCE.sysctl(mib, mib.length, pNbCPU,
  					new IntByReference(SystemB.INT_SIZE), null, 0))
  				throw new LastErrorException("Error code: "
  						+ Native.getLastError());
  			nbCPU = pNbCPU.getInt(0);
  			for (int i = 0; i < nbCPU; i++)
  				processors.add(new CentralProcessor(i));
  
  			this._processors = processors.toArray(new Processor[0]);
  		}
  		return this._processors;
  	}
  
  	/*
  	 * (non-Javadoc)
  	 * 
  	 * @see oshi.hardware.HardwareAbstractionLayer#getMemory()
  	 */
  	@Override
  	public Memory getMemory() {
  		if (this._memory == null) {
  			this._memory = new GlobalMemory();
  		}
  		return this._memory;
  	}
  
  	@Override
  	public PowerSource[] getPowerSources() {
  		if (this._powerSources == null) {
  			this._powerSources = MacPowerSource.getPowerSources();
  		}
  		return this._powerSources;
  	}
  
  	@Override
  	public OSFileStore[] getFileStores() {
  		return MacFileSystem.getFileStores();
  	}
  
 }