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CleavageBondReaction.java

/*
 *  $RCSfile$
 *  $Author: egonw $
 *  $Date: 2006-03-29 10:27:08 +0200 (Wed, 29 Mar 2006) $
 *  $Revision: 5855 $
 *
 *  Copyright (C) 2006-2007  Miguel Rojas <miguel.rojas@uni-koeln.de>
 *
 *  Contact: cdk-devel@lists.sourceforge.net
 *
 *  This program 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 program 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 program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package org.openscience.cdk.reaction.type;


import org.openscience.cdk.CDKConstants;
import org.openscience.cdk.DefaultChemObjectBuilder;
import org.openscience.cdk.exception.CDKException;
import org.openscience.cdk.graph.ConnectivityChecker;
import org.openscience.cdk.interfaces.*;
import org.openscience.cdk.reaction.IReactionProcess;
import org.openscience.cdk.reaction.ReactionSpecification;
import org.openscience.cdk.tools.LoggingTool;

import java.util.Iterator;

/**
 * <p>IReactionProcess which a bond that is being broken to generate single electron
 * for each atom.
 * <pre>A-B => [A*] + [B*]</pre>
 * <pre>
 *  IMoleculeSet setOfReactants = DefaultChemObjectBuilder.getInstance().newMoleculeSet();
 *  setOfReactants.addMolecule(new Molecule());
 *  IReactionProcess type = new CleavageBondReaction();
 *  Object[] params = {Boolean.FALSE};
    type.setParameters(params);
 *  IReactionSet setOfReactions = type.initiate(setOfReactants, null);
 *  </pre>
 *
 * <p>We have the possibility to localize the reactive center. Good method if you
 * want to localize the reaction in a fixed point</p>
 * <pre>atoms[0].setFlag(CDKConstants.REACTIVE_CENTER,true);</pre>
 * <p>Moreover you must put the parameter Boolean.TRUE</p>
 * <p>If the reactive center is not localized then the reaction process will
 * try to find automatically the posible reactive center.</p>
 *
 *
 * @author         Miguel Rojas
 *
 * @cdk.created    2006-10-27
 * @cdk.module     reaction
 * @cdk.set        reaction-types
 *
 **/
00067 public class CleavageBondReaction implements IReactionProcess{
    private LoggingTool logger;
    private boolean hasActiveCenter;
    private static final int BONDTOFLAG = 8;
    /**
     * Constructor of the cleavageBondReaction object
     *
     */
00075     public CleavageBondReaction(){
        logger = new LoggingTool(this);
    }
    /**
     *  Gets the specification attribute of the CleavageBondReaction object
     *
     *@return    The specification value
     */
00083     public ReactionSpecification getSpecification() {
        return new ReactionSpecification(
                "http://almost.cubic.uni-koeln.de/jrg/Members/mrc/reactionDict/reactionDict#CleavageBondReaction",
                this.getClass().getName(),
                "$Id: CleavageBondReaction.java,v 1.6 2006/04/01 08:26:47 mrc Exp $",
                "The Chemistry Development Kit");
    }

    /**
     *  Sets the parameters attribute of the CleavageBondReaction object
     *
     *@param  params            The parameter is if the molecule has already fixed the center active or not. It
     *                                          should be set before to inize the reaction with a setFlag:  CDKConstants.REACTIVE_CENTER
     *@exception  CDKException  Description of the Exception
     */
00098     public void setParameters(Object[] params) throws CDKException {
        if (params.length > 1) {
            throw new CDKException("cleavageBondReaction only expects one parameter");
        }
        if (!(params[0] instanceof Boolean)) {
            throw new CDKException("The parameter 1 must be of type boolean");
        }
        hasActiveCenter = ((Boolean) params[0]).booleanValue();
    }


    /**
     *  Gets the parameters attribute of the CleavageBondReaction object
     *
     *@return    The parameters value
     */
00114     public Object[] getParameters() {
        Object[] params = new Object[1];
        params[0] = new Boolean (hasActiveCenter);
        return params;
    }

    /**
     *  Initiate process.
     *  It is needed to call the addExplicitHydrogensToSatisfyValency
     *  from the class tools.HydrogenAdder.
     *
     *@param  reactants         reactants of the reaction.
     *@param  agents            agents of the reaction (Must be in this case null).
     *
     *@exception  CDKException  Description of the Exception
     */
00130     public IReactionSet initiate(IMoleculeSet reactants, IMoleculeSet agents) throws CDKException{

        logger.debug("initiate reaction: CleavageBondReaction");

        if (reactants.getMoleculeCount() != 1) {
            throw new CDKException("CleavageBondReaction only expects one reactant");
        }
        if (agents != null) {
            throw new CDKException("CleavageBondReaction don't expects agents");
        }

        IReactionSet setOfReactions = DefaultChemObjectBuilder.getInstance().newReactionSet();
        IMolecule reactant = reactants.getMolecule(0);

        /* if the parameter hasActiveCenter is not fixed yet, set the active centers*/
        if(!hasActiveCenter){
            setActiveCenters(reactant);
        }

        Iterator bonds = reactants.getMolecule(0).bonds();
        while (bonds.hasNext()) {
            IBond bond = (IBond) bonds.next();

            if(bond.getFlag(CDKConstants.REACTIVE_CENTER))
                if(bond.getAtom(0).getFormalCharge() == 0 && bond.getAtom(1).getFormalCharge() == 0){

                int atom1 = reactants.getMolecule(0).getAtomNumber(bond.getAtom(0));
                int atom2 = reactants.getMolecule(0).getAtomNumber(bond.getAtom(1));
                cleanFlagBOND(reactants.getMolecule(0));
                bond.setFlag(BONDTOFLAG, true);

                IReaction reaction = DefaultChemObjectBuilder.getInstance().newReaction();
                reaction.addReactant(reactants.getMolecule(0));

                IMolecule reactantCloned;
                try {
                    reactantCloned = (IMolecule) reactant.clone();
                } catch (CloneNotSupportedException e) {
                    throw new CDKException("Could not clone IMolecule!", e);
                }

                reactantCloned.addSingleElectron(reactant.getBuilder().newSingleElectron(reactantCloned.getAtom(atom1)));
                reactantCloned.addSingleElectron(reactant.getBuilder().newSingleElectron(reactantCloned.getAtom(atom2)));

                double order = 0;
                IBond bondClon = null;
                for(int l = 0 ; l<reactantCloned.getBondCount();l++){
                    if(reactantCloned.getBond(l).getFlag(BONDTOFLAG)){
                        IBond bondFlag = reactantCloned.getBond(l);
                        order = bondFlag.getOrder();
                        if(order == 1){
                            reactantCloned.removeBond(bondFlag.getAtom(0), bondFlag.getAtom(1));
                        }
                        else{
                            reactantCloned.getBond(l).setOrder(order-1);
                            bondClon = reactantCloned.getBond(l);
                        }
                        break;
                    }
                }

                IMoleculeSet moleculeSet = null;
                if(order == 1)/*break molecule*/{
                    moleculeSet = ConnectivityChecker.partitionIntoMolecules(reactantCloned);
                    for(int z = 0 ; z < moleculeSet.getAtomContainerCount(); z++){
                        IMolecule ac = moleculeSet.getMolecule(z);
                        reaction.addProduct(ac);
                    }
                }
                else{
                    reaction.addProduct(reactantCloned);
                }


                /* mapping */
                IMapping mapping = DefaultChemObjectBuilder.getInstance().newMapping(bond.getAtom(0), reactantCloned.getAtom(atom1));
                reaction.addMapping(mapping);
                mapping = DefaultChemObjectBuilder.getInstance().newMapping(bond.getAtom(1), reactantCloned.getAtom(atom2));
                reaction.addMapping(mapping);
                if( order != 1){
                    mapping = DefaultChemObjectBuilder.getInstance().newMapping(bond, bondClon);
                    reaction.addMapping(mapping);
                }


                /*adding only that contains product*/
                if(reaction.getProductCount() != 0)
                    setOfReactions.addReaction(reaction);


                bond.setFlag(BONDTOFLAG, false);
            }

        }

        return setOfReactions;
    }
    /**
     * set the active center for this molecule.
     * The active center will be those which correspond with A-B. If
     * the bond is simple, it will be breaked forming two fragments
     * <pre>
     * A: Atom
     * #/=/-: bond
     * B: Atom
     *  </pre>
     *
     * @param reactant The molecule to set the activity
     * @throws CDKException
     */
00240     private void setActiveCenters(IMolecule reactant) throws CDKException {
        Iterator bonds = reactant.bonds();
        while (bonds.hasNext()) {
            IBond bond = (IBond) bonds.next();
            if (bond.getAtom(0).getFormalCharge() == 0 && bond.getAtom(1).getFormalCharge() == 0)
                bond.setFlag(CDKConstants.REACTIVE_CENTER, true);
        }
    }
    /**
     *  Gets the parameterNames attribute of the CleavageBondReaction object
     *
     *@return    The parameterNames value
     */
00253     public String[] getParameterNames() {
        String[] params = new String[1];
        params[0] = "hasActiveCenter";
        return params;
    }


    /**
     *  Gets the parameterType attribute of the CleavageBondReaction object
     *
     *@param  name  Description of the Parameter
     *@return       The parameterType value
     */
00266     public Object getParameterType(String name) {
        return new Boolean(false);
    }

    /**
     * clean the flags CDKConstants.REACTIVE_CENTER from the molecule
     *
     * @param ac
     */
00275     public void cleanFlagBOND(IAtomContainer ac){
        for(int j = 0 ; j < ac.getBondCount(); j++)
            ac.getBond(j).setFlag(BONDTOFLAG, false);
    }
}

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