org/objectweb/proactive/calcium/skeletons/Pipe.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.calcium.skeletons;

import java.util.Arrays;
import java.util.List;

import java.util.Vector;

import org.objectweb.proactive.calcium.interfaces.Instruction;
import org.objectweb.proactive.calcium.interfaces.Skeleton;

public class Pipe<T> implements Skeleton<T> {
        
        Vector<Skeleton<T>> stages;
        
        public Pipe(Skeleton<T> child1, Skeleton<T> child2){
                
                stages = new Vector<Skeleton<T>>();
                stages.add(child1);
                stages.add(child2);
        }

        public Pipe(Skeleton<T>... args){
                this(Arrays.asList(args));
        }
        
        public Pipe(List<Skeleton<T>> stages){
                if(stages.size() <=0 ) {
                        throw new IllegalArgumentException("Pipe must have at least one stage");
                }
                this.stages = new Vector<Skeleton<T>>();
                this.stages.addAll(stages);
        }       
        
        public Vector<Instruction<T>> getInstructionStack() {

                Vector<Instruction<T>> instruction = new Vector<Instruction<T>>();
                
                //the last go into the stack first
                for(int i=stages.size()-1;i>=0;i--){
                        instruction.addAll(stages.get(i).getInstructionStack());
                }       
                
                /*A 2 stage Pipe. Only here for hystorical/educational purposes.

                Vector<Instruction> v1= child1.getInstructionStack();
                Vector<Instruction> v2= child2.getInstructionStack();
                
                //execute first v1 and then v2
                v2.addAll(v1);
                
                return v2;
                */
                return instruction;
        }
}

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