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SmallestRingAtom.java

/* $Revision: $ $Author: $ $Date: $ 
 *
 * Copyright (C) 2004-2007  The Chemistry Development Kit (CDK) project
 *
 * 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, 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * (or see http://www.gnu.org/copyleft/lesser.html)
 */
package org.openscience.cdk.isomorphism.matchers.smarts;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.openscience.cdk.CDKConstants;
import org.openscience.cdk.interfaces.IAtom;

/**
 * This smarts atom matches any atom with the smallest SSSR size being a 
 * certain value
 *
 * @author Dazhi Jiao
 * @cdk.created 2007-04-24
 * @cdk.module smarts
 * @cdk.keyword SMARTS AST
 */
00038 public class SmallestRingAtom extends SMARTSAtom {
00039       private static final long serialVersionUID = 8201040824866400163L;
      /**
       * The size of the smallest SSSR
       */
00043       private int smallestRingSize;

      public SmallestRingAtom(int size) {
            this.smallestRingSize = size;
      }

00049       public boolean matches(IAtom atom) {
            if (atom.getFlag(CDKConstants.ISINRING)) {
                  List rings = (List) atom
                              .getProperty(CDKConstants.RING_SIZES);
                  if (rings == null || rings.size() == 0) {
                        return false;
                  }
                  Collections.sort(rings);
                  if (((Integer)rings.get(0)).intValue() == smallestRingSize) {
                        return true;
                  }
            }
            return false;
      }
}

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