/*

     This file is part of Combean.

     Combean is free software; you can redistribute it and/or modify

     it under the terms of the GNU General Public License as published by

     the Free Software Foundation; either version 2 of the License, or

     (at your option) any later version.

     Combean 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 General Public License for more details.

     You should have received a copy of the GNU General Public License

     along with Combean; if not, write to the Free Software

     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

 /*

  * Created on 02.09.2005

  *

  */

 package net.sourceforge.combean.graph.alg.lp;

 import net.sourceforge.combean.interfaces.graph.Edge;

 import net.sourceforge.combean.interfaces.graph.containers.doubleval.FixedDoubleEdgeMap;

 import net.sourceforge.combean.interfaces.graph.prop.GlobalNumberedEdgesGraphProp;

 import net.sourceforge.combean.interfaces.mathprog.lp.LPVariable;

 import net.sourceforge.combean.interfaces.mathprog.lp.model.LPVariableSequence;

 import net.sourceforge.combean.mathprog.lp.DoubleLPVariable;

 import net.sourceforge.combean.mathprog.lp.model.AbstractLPVariableSequence;

 /**

  * An LPVariableSequence which contains one variable per edge in a graph

  * with numbered edges.

  * 

  * @author schickin

  *

  */

 public class EdgesAsLPVariableSequence extends AbstractLPVariableSequence

 implements LPVariableSequence {

     private GlobalNumberedEdgesGraphProp numberedEdges = null;

     private FixedDoubleEdgeMap edgeCost = null;

     private FixedDoubleEdgeMap edgeUpperBound = null;

     private FixedDoubleEdgeMap edgeLowerBound = null;

     /**

      * Constructor

      * 

      * @param numberedEdges the graph for which the edges shall be turned

      * into LP variables.

      */

     public EdgesAsLPVariableSequence(String offsetId,

             GlobalNumberedEdgesGraphProp numberedEdges) {

         super(offsetId);

         this.numberedEdges = numberedEdges;

     }

     /* (non-Javadoc)

      * @see net.sourceforge.combean.interfaces.mathprog.lp.model.LPConditionSequence#getLength()

      */

     public int getNumVars() {

         return this.numberedEdges.getNumEdges();

     }

     /* (non-Javadoc)

      * @see net.sourceforge.combean.interfaces.mathprog.lp.model.LPVariableSequence#getLPVariable(int)

      */

     public LPVariable getLPVariable(int localColumn) {

         Edge e = this.numberedEdges.getEdge(localColumn);

         double coeff = 0;

         if (this.edgeCost != null) {

             coeff = this.edgeCost.getDouble(e);

         }

         double lower = 0;

         if (this.edgeLowerBound != null) {

             lower = this.edgeLowerBound.getDouble(e);

         }

         double upper = Double.POSITIVE_INFINITY;

         if (this.edgeUpperBound != null) {

             upper = this.edgeUpperBound.getDouble(e);

         }

         return new DoubleLPVariable(getVarOffsetId() + localColumn,

                 coeff, lower, upper);

     }

     /**

      * @param edgeCost The edgeCost to set.

      */

     public final void setEdgeCost(FixedDoubleEdgeMap edgeCost) {

         this.edgeCost = edgeCost;

     }

     /**

      * @param edgeLowerBound The edgeLowerBound to set.

      */

     public final void setEdgeLowerBound(FixedDoubleEdgeMap edgeLowerBound) {

         this.edgeLowerBound = edgeLowerBound;

     }

     /**

      * @param edgeUpperBound The edgeUpperBound to set.

      */

     public final void setEdgeUpperBound(FixedDoubleEdgeMap edgeUpperBound) {

         this.edgeUpperBound = edgeUpperBound;

     }

 }