matlabcontrol.java

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/* MatlabControl.java
 *
 * "Copyright (c) 2001 and The Regents of the University
 * of California.  All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * $\Id$
 */

/**
 * This class interfaces with the current Matlab session, allowing you
 * to call matlab commands from Java objects
 *
 * @author <a href="mailto:[e-mail]">Kamin Whitehouse</a>
 */

package net.tinyos.matlab;

import java.lang.System.*;

import com.mathworks.jmi.*;

public class MatlabControl {
    Matlab matlab = null; //this is the com.mathworks.jmi.Matlab class,which has functionality allowing one to interact with the matlab session.
    boolean useCb=false;
    Object returnVal;
    String callbackFunction; 

    /***************CONSTRUCTORS****************/
    /*** usually, the default constructor with no arguments is fine.
     * Sometimes, a callback function is useful.  A callback function
     * is allows the user to pass the command and its arguments to a
     * matlab function, which will figure out the best way to executue
     * it, instead of trying to execute it directly from java.  This
     * is often useful for handling/printing errors as well as dealing
     * with native matlab data types, like cell arrays.  The cell
     * array is not really converted to a java type, only the handle
     * of the cell array is converted to a java type, so often a
     * matlab callback function is useful for dealing specially with
     * cell arrays, etc.
     ***/

    public MatlabControl() {
        this(false);
    }

    public MatlabControl(boolean useCallback) {
	this(useCallback,new String("matlabControlcb"));
    }

    public MatlabControl(boolean useCallback, String CallBackFunction) {
        try {
            if (matlab == null)
                matlab = new Matlab();//this command links to the current matlab session
        } catch (Exception e) {
	    System.out.println(e.toString());
        }
        returnVal = new String("noReturnValYet");
        this.useCb=useCallback;
	callbackFunction=CallBackFunction;
    }

    /***************USER-LEVEL FUNCTIONS****************/
    /***call these from any java thread (as long as the thread
     * originated from within matlab) 
     ***/

    /**Evaluate a string, Matlab script, or Matlab function**/
    public void eval(String Command) {
        Matlab.whenMatlabReady(new MatlabEvalCommand(Command,useCb));
    }

    /**Evaluate a Matlab function that requires arguments.  Each element of
     the "args" vector is an argument to the function "Command"**/
    public void feval(String Command, Object[] args) {
        Matlab.whenMatlabReady(new MatlabFevalCommand(Command, args,useCb));
    }

    /**Evaluate a Matlab function that requires arguments and provide return arg.
     * Each element of the "args" vector is an argument to the function "Command"**/
    public Object blockingFeval(String Command, Object[] args) throws InterruptedException {
        returnVal = new String("noReturnValYet");
        Matlab.whenMatlabReady(new MatlabBlockingFevalCommand(Command, args, useCb, this));
        if (returnVal.equals(new String("noReturnValYet"))) {
            synchronized(returnVal){
                 returnVal.wait();
            }
        }
        return returnVal;
    }

    /**Echoing the eval statement is useful if you want to see in
     * matlab each time that a java function tries to execute a matlab
     * command **/
    public void setEchoEval(boolean echo){
	Matlab.setEchoEval(echo);
    }

    /**********TEST FUNCTIONS***********************/
    /***call these functions from within Matlab itself.  These are examples of the general execution order:
	1. instantiate java object from matlab
	2. spawn a new Java thread
	3. call matlab functions from new java thread  

	example:
    ****/

    public void testEval(final String Command) {
    class Caller extends Thread{
         public void run(){
              try{
                   eval(Command);
              } catch(Exception e){
		  //                System.out.println(e.toString());
	      }
         }
    }
    Caller c = new Caller();
    c.start();
    }

    public void testFeval(final String Command, final Object[] args) {
    class Caller extends Thread{
         public void run(){
              try{
                   feval(Command, args);
              } catch(Exception e){
		  //                System.out.println(e.toString());
	      }
         }
    }
    Caller c = new Caller();
    c.start();
    }

    public void testBlockingFeval(final String Command, final Object[] args) {
    class Caller extends Thread{
         public void run(){
              try{
                   Object rets[] = new Object[1];
                   rets[0] = blockingFeval(Command, args);
                   feval(new String("disp"),rets );
              } catch(Exception e){
		  //                System.out.println(e.toString());
	      }
         }
    }
    Caller c = new Caller();
    c.start();
    }



    /********   INTERNAL FUNCTIONS AND CLASSES  *******/

    public void setReturnVal(Object val) {
        synchronized(returnVal){
            Object oldVal = returnVal;
            returnVal = val;
            oldVal.notifyAll();
        }
    }

    /** This class is used to execute a string in Matlab **/
    protected class MatlabEvalCommand implements Runnable {
        String command;
        boolean useCallback,eval;
        Object[] args;

        public MatlabEvalCommand(String Command, boolean useCallback) {
            command = Command;
            this.useCallback = useCallback;
	    eval=true;
            args=null;
        }

        protected Object useMatlabCommandCallback(String command, Object[] args){
            int numArgs = (args==null)? 0 : args.length;
            Object newArgs[] = new Object[numArgs+1] ;
            newArgs[0]=command;
            for(int i=0;i<numArgs;i++){
                newArgs[i+1] = args[i];
            }
            try{
                return matlab.mtFevalConsoleOutput(new String("matlabControlcb"), newArgs, 0);
            }
            catch(Exception e){
		//                System.out.println(e.toString());
		return null;
	    }
        }

        public void run() {
            try {
                if(useCallback){
                    useMatlabCommandCallback(command, args);
                }
                else if(eval){
                    matlab.evalConsoleOutput(command);
                }
                else{
                    matlab.fevalConsoleOutput(command, args, 0, null);
                }
            } catch (Exception e) {
                System.out.println(e.toString());
            }
        }
    }

    /** This class is used to execute a function in matlab and pass paramseters**/
    protected class MatlabFevalCommand extends MatlabEvalCommand {

        public MatlabFevalCommand(String Command, Object[] Args, boolean useCallback) {
            super(Command, useCallback);
            args = Args;
	    eval=false;
        }

    }

    /** This class is used to execute a function in matlab and pass paramseters
     *  and it also return arguments**/
    protected class MatlabBlockingFevalCommand extends MatlabFevalCommand {
        MatlabControl parent;

        public MatlabBlockingFevalCommand(String Command, Object[] Args, boolean useCallback, MatlabControl parent) {
            super(Command, Args, useCallback);
            this.parent=parent;
        }

        public void run() {
            try {
                if(useCallback){
                    parent.setReturnVal(useMatlabCommandCallback(command, args));
                }
                else{
                    parent.setReturnVal(matlab.mtFevalConsoleOutput(command, args, 0));
                }
            } catch (Exception e) {
		//                System.out.println(e.toString());
            }
        }
    }
}