/**********************************************************************
 * Copyright (c) 2006 IBM Corporation.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ptp.pldt.openmp.analysis.ompcfg;

import org.eclipse.ptp.pldt.openmp.analysis.PAST.PASTOMPPragma;


/**
 * 
 * @author pazel
 *
 */
public class OMPPragmaNode extends OMPCFGNode
{
    protected PASTOMPPragma     pragma_          = null;   // pragma we are holding
    protected OMPPragmaNode     contextPred_     = null;   // backward chain of context
    
    protected boolean           implicitBarrier_ = false;   // used to tie parallel/for/sections end
    
    /**
     * OMPPragmaNode - Constructor
     * @param pragma - PASTOMPPragma
     * @param contextPredecessor - OMPPragmaNode
     */
    public OMPPragmaNode(PASTOMPPragma pragma, OMPPragmaNode contextPredecessor)
    {
        super();
        pragma_       = pragma;
        contextPred_ = contextPredecessor;
    }
    
    /**
     * OMPPragmaNode - constructor
     * @param pragma - PASTOMPPragma
     */
    public OMPPragmaNode(PASTOMPPragma pragma)
    {
        super();
        pragma_     = pragma;
    }
    
    public OMPPragmaNode()
    {
        super();
        implicitBarrier_ = true;
    }
    
    /**
     * getPragma - accessor to pragma
     * @return PASTOMPPragma
     */
    public PASTOMPPragma getPragma()
    {
        return pragma_;
    }
    
    /**
     * isImplicitBarrier - returns whether if is implicit barrier
     * @return boolean
     */
    public boolean isImplicitBarrier()
    {
        return implicitBarrier_;
    }
    
    /**
     * getContextPredecessor - get the pragma context predecessor
     * @return
     */
    public OMPPragmaNode getContextPredecessor()
    {
        return contextPred_;
    }
    
    /**
     * getContext - get the list of related pragma - most recent to oldest [0--N]
     * @return OMPPragmaNode []
     */
    public OMPPragmaNode [] getContext()
    {
        int count = 0;
        OMPPragmaNode pred = this;
        while(pred!=null) {
            count++;
            pred=pred.getContextPredecessor();  
        }
        
        OMPPragmaNode [] list = new OMPPragmaNode[count];
        int i = 0;
        pred = this;
        while(pred!=null) {
            list[i++] = pred;
            pred=pred.getContextPredecessor();
        }
        
        return list;
    }
    
    public String getType()
    {
        if (pragma_!=null)  return pragma_.getType();
        else {
            if (implicitBarrier_)  return "implicit barrier";
        }
        return "";
    }
}