/* $Revision$ $Author$ $Date$
*
* Copyright (C) 2004-2007 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.qsar.descriptors.bond;
import org.openscience.cdk.annotations.TestClass;
import org.openscience.cdk.annotations.TestMethod;
import org.openscience.cdk.charges.GasteigerMarsiliPartialCharges;
import org.openscience.cdk.exception.CDKException;
import org.openscience.cdk.interfaces.IAtomContainer;
import org.openscience.cdk.interfaces.IBond;
import org.openscience.cdk.interfaces.IMolecule;
import org.openscience.cdk.qsar.AbstractBondDescriptor;
import org.openscience.cdk.qsar.DescriptorSpecification;
import org.openscience.cdk.qsar.DescriptorValue;
import org.openscience.cdk.qsar.result.DoubleResult;
import java.util.Iterator;
/**
* The calculation of bond-sigma Partial charge is calculated
* determining the difference the Partial Sigma Charge on atoms
* A and B of a bond. Based in Gasteiger Charge.
* <p>This descriptor uses these parameters:
* <table border="1">
* <tr>
* <td>Name</td>
* <td>Default</td>
* <td>Description</td>
* </tr>
* <tr>
* <td>bondPosition</td>
* <td>0</td>
* <td>The position of the target bond</td>
* </tr>
* </table>
*
*
* @author Miguel Rojas
* @cdk.created 2006-05-08
* @cdk.module qsarbond
* @cdk.githash
* @cdk.set qsar-descriptors
* @cdk.dictref qsar-descriptors:bondPartialSigmaCharge
*
* @see org.openscience.cdk.qsar.descriptors.atomic.PartialSigmaChargeDescriptor
*/
@TestClass(value="org.openscience.cdk.qsar.descriptors.bond.BondPartialSigmaChargeDescriptorTest")
public class BondPartialSigmaChargeDescriptor extends AbstractBondDescriptor {
private GasteigerMarsiliPartialCharges peoe = null;
/**Number of maximum iterations*/
private int maxIterations;
private static final String[] descriptorNames = {"peoeB"};
/**
* Constructor for the BondPartialSigmaChargeDescriptor object
*/
public BondPartialSigmaChargeDescriptor() {
peoe = new GasteigerMarsiliPartialCharges();
}
/**
* Gets the specification attribute of the BondPartialSigmaChargeDescriptor
* object
*
*@return The specification value
*/
@TestMethod(value="testGetSpecification")
public DescriptorSpecification getSpecification() {
return new DescriptorSpecification(
"http://www.blueobelisk.org/ontologies/chemoinformatics-algorithms/#bondPartialSigmaCharge",
this.getClass().getName(),
"$Id$",
"The Chemistry Development Kit");
}
/**
* This descriptor does have any parameter.
*/
@TestMethod(value="testSetParameters_arrayObject")
public void setParameters(Object[] params) throws CDKException {
if (params.length > 1) {
throw new CDKException("PartialSigmaChargeDescriptor only expects one parameter");
}
if (!(params[0] instanceof Integer)) {
throw new CDKException("The parameter 1 must be of type Integer");
}
maxIterations = (Integer) params[0];
}
/**
* Gets the parameters attribute of the BondPartialSigmaChargeDescriptor object.
*
*@return The parameters value
* @see #setParameters
*/
@TestMethod(value="testGetParameters")
public Object[] getParameters() {
// return the parameters as used for the descriptor calculation
Object[] params = new Object[1];
params[0] = (Integer)maxIterations;
return params;
}
@TestMethod(value="testNamesConsistency")
public String[] getDescriptorNames() {
return descriptorNames;
}
private DescriptorValue getDummyDescriptorValue(Exception e) {
return new DescriptorValue(getSpecification(), getParameterNames(), getParameters(),
new DoubleResult(Double.NaN), descriptorNames,e);
}
/**
* The method calculates the bond-sigma Partial charge of a given bond
* It is needed to call the addExplicitHydrogensToSatisfyValency method from the class tools.HydrogenAdder.
*
*@param ac AtomContainer
*@return return the sigma electronegativity
*/
@TestMethod(value="testCalculate_IBond_IAtomContainer,testBondSigmaElectronegativityDescriptor,testBondSigmaElectronegativityDescriptor_Methyl_chloride")
public DescriptorValue calculate(IBond bond, IAtomContainer ac) {
// FIXME: for now I'll cache a few modified atomic properties, and restore them at the end of this method
Double originalCharge1 = bond.getAtom(0).getCharge();
Double originalCharge2 = bond.getAtom(1).getCharge();
if (!isCachedAtomContainer(ac)) {
IMolecule mol = ac.getBuilder().newMolecule(ac);
if(maxIterations != 0) peoe.setMaxGasteigerIters(maxIterations);
try {
peoe.assignGasteigerMarsiliSigmaPartialCharges(mol, true);
for(Iterator<IBond> it = ac.bonds().iterator() ; it.hasNext(); ) {
IBond bondi = it.next();
double result = Math.abs(bondi.getAtom(0).getCharge()-bondi.getAtom(1).getCharge());
cacheDescriptorValue(bondi, ac, new DoubleResult(result));
}
} catch (Exception ex1) {
return getDummyDescriptorValue(ex1);
}
}
bond.getAtom(0).setCharge(originalCharge1);
bond.getAtom(1).setCharge(originalCharge2);
return getCachedDescriptorValue(bond) != null
? new DescriptorValue(getSpecification(), getParameterNames(), getParameters(),
getCachedDescriptorValue(bond), descriptorNames)
: null;
}
/**
* Gets the parameterNames attribute of the BondPartialSigmaChargeDescriptor object.
*
* @return The parameterNames value
*/
@TestMethod(value="testGetParameterNames")
public String[] getParameterNames() {
String[] params = new String[1];
params[0] = "maxIterations";
return params;
}
/**
* Gets the parameterType attribute of the BondPartialSigmaChargeDescriptor object.
*
* @param name Description of the Parameter
* @return An Object of class equal to that of the parameter being requested
*/
@TestMethod(value="testGetParameterType_String")
public Object getParameterType(String name) {
if ("maxIterations".equals(name)) return Integer.MAX_VALUE;
return null;
}
}