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/* Soot - a J*va Optimization Framework
 * Copyright (C) 1997-1999 Raja Vallee-Rai and Patrick Lam
 *
 * 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 (at your option) 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.
 */

/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */


package soot;

import soot.util.*;
import java.util.*;

/** A wrapper object for a pack of optimizations.
 * Provides chain-like operations, except that the key is the phase name. */
public abstract class Pack implements HasPhaseOptions
{
    private String name;
    public String getPhaseName() { return name; }
    public Pack( String name ) {
        this.name = name;
    }
    Chain opts = new HashChain();
    
    public Iterator iterator() { return opts.iterator(); }

    public void add(Transform t) { 
    	if(!t.getPhaseName().startsWith(getPhaseName()+".")) {
    		throw new RuntimeException("Transforms in pack '"+getPhaseName()+"' must have a phase name " +
    				"that starts with '"+getPhaseName()+".'.");
    	}    	
        PhaseOptions.v().getPM().notifyAddPack();
        if( get( t.getPhaseName() ) != null ) {
            throw new RuntimeException( "Phase "+t.getPhaseName()+" already "
                    +"in pack" );
        }
        opts.add(t); 
    }

    public void insertAfter(Transform t, String phaseName) 
    {
        PhaseOptions.v().getPM().notifyAddPack();
        Iterator it = opts.iterator();
        while (it.hasNext())
        {
            Transform tr = (Transform)it.next();
            if (tr.getPhaseName().equals(phaseName))
            {
                opts.insertAfter(t, tr);
                return;
            }
        }
        throw new RuntimeException("phase "+phaseName+" not found!");
    }

    public void insertBefore(Transform t, String phaseName)
    {
        PhaseOptions.v().getPM().notifyAddPack();
        Iterator it = opts.iterator();
        while (it.hasNext())
        {
            Transform tr = (Transform)it.next();
            if (tr.getPhaseName().equals(phaseName))
            {
                opts.insertBefore(t, tr);
                return;
            }
        }
        throw new RuntimeException("phase "+phaseName+" not found!");
    }

    public Transform get( String phaseName ) {
        for( Iterator trIt = opts.iterator(); trIt.hasNext(); ) {
            final Transform tr = (Transform) trIt.next();
            if( tr.getPhaseName().equals(phaseName) ) {
                return tr;
            }
        }
        return null;
    }

    protected void internalApply() {
        throw new RuntimeException("wrong type of pack");
    }

    protected void internalApply(Body b) {
        throw new RuntimeException("wrong type of pack");
    }

    public final void apply() {
        Map options = PhaseOptions.v().getPhaseOptions( this );
        if( !PhaseOptions.getBoolean( options, "enabled" ) ) return;
        internalApply();
    }

    public final void apply(Body b) {
        Map options = PhaseOptions.v().getPhaseOptions( this );
        if( !PhaseOptions.getBoolean( options, "enabled" ) ) return;
        internalApply(b);
    }

    public String getDeclaredOptions() { return soot.options.Options.getDeclaredOptionsForPhase( getPhaseName() ); }
    public String getDefaultOptions() { return soot.options.Options.getDefaultOptionsForPhase( getPhaseName() ); }
}