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* $Author: sushil_ronghe $
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* $Date: 2007-04-17 20:49:16 +0200 (Tue, 17 Apr 2007) $
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* Copyright (C) 2004-2007 The Chemistry Development Kit (CDK) project
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* Contact: cdk-devel@lists.sourceforge.net
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.openscience.cdk.isomorphism.matchers.smarts;
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import org.openscience.cdk.interfaces.IAtom;
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* This matcher checks the number of implicit hydrogens of the Atom.
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public class ImplicitHCountAtom extends SMARTSAtom {
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private static final long serialVersionUID = 6752937431492584928L;
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public ImplicitHCountAtom(int hCount) {
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public ImplicitHCountAtom(){
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this.hCount = Default;
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public int getOperator(){
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if(ID!=null && this.hCount==Default)
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else if(ID!=null && this.hCount!=Default)
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else if(this.hCount==Default)
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else if(this.hCount!=Default)
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private int getIMPH(IAtom atom){
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return atom.getHydrogenCount();
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public boolean matches(IAtom atom) {
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switch(getOperator()){
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case 1:return defaultOperatorCheck(atom);
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case 2:return nonDefaultOperatorCheck(atom);
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case 3:return defaultCheck(atom);
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case 4:return nonDefaultCheck(atom);
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private boolean defaultCheck(IAtom atom){
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if(getIMPH(atom)!=0)return true;
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private boolean nonDefaultCheck(IAtom atom){
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if(getIMPH(atom)!=0 && getIMPH(atom)==this.hCount) return true;
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private boolean defaultOperatorCheck(IAtom atom){
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if(getIMPH(atom)==0)return true;
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private boolean nonDefaultOperatorCheck(IAtom atom){
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if(getIMPH(atom)!=0 && getIMPH(atom)!=this.hCount) return false;
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public String toString() {
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StringBuffer s = new StringBuffer();
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s.append("ImplicitHCountAtom(");
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s.append(this.hashCode() + ", ");
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s.append("IH:" + hCount);