/**
* Copyright (c) 1999-2014, Ecole des Mines de Nantes
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Ecole des Mines de Nantes nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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*/
package solver.search.strategy;
import solver.search.strategy.selectors.SetValueSelector;
import solver.search.strategy.selectors.VariableSelector;
import solver.search.strategy.selectors.values.SetDomainMin;
import solver.search.strategy.selectors.variables.InputOrder;
import solver.search.strategy.selectors.variables.MaxDelta;
import solver.search.strategy.selectors.variables.MinDelta;
import solver.search.strategy.strategy.SetStrategy;
import solver.variables.SetVar;
/**
* Strategies over set variables
* Just there to simplify strategies creation.
* <br/>
*
* @author Jean-Guillaume Fages
* @since 02/2013
*/
public final class SetStrategyFactory {
private SetStrategyFactory() {
}
/**
* Generic strategy to branch on set variables
*
* @param varS variable selection strategy
* @param valS integer selection strategy
* @param enforceFirst branching order true = enforce first; false = remove first
* @param sets SetVar array to branch on
* @return a strategy to instantiate sets
*/
public static SetStrategy custom(VariableSelector<SetVar> varS, SetValueSelector valS, boolean enforceFirst, SetVar... sets) {
return new SetStrategy(sets, varS, valS, enforceFirst);
}
/**
* strategy to branch on sets by choosing the first unfixed variable and forcing its first unfixed value
*
* @param sets variables to branch on
* @return a strategy to instantiate sets
*/
public static SetStrategy force_first(SetVar... sets) {
return custom(new InputOrder<SetVar>(), new SetDomainMin(), true, sets);
}
/**
* strategy to branch on sets by choosing the first unfixed variable and removing its first unfixed value
*
* @param sets variables to branch on
* @return a strategy to instantiate sets
*/
public static SetStrategy remove_first(SetVar... sets) {
return custom(new InputOrder<SetVar>(), new SetDomainMin(), false, sets);
}
/**
* strategy to branch on sets
* by choosing the unfixed variable of minimum delta (envSize-kerSize),
* and forcing its first unfixed value
*
* @param sets variables to branch on
* @return a strategy to instantiate sets
*/
public static SetStrategy force_minDelta_first(SetVar... sets) {
return custom(new MinDelta(), new SetDomainMin(), true, sets);
}
/**
* strategy to branch on sets
* by choosing the unfixed variable of maximum delta (envSize-kerSize),
* and forcing its first unfixed value
*
* @param sets variables to branch on
* @return a strategy to instantiate sets
*/
public static SetStrategy force_maxDelta_first(SetVar... sets) {
return custom(new MaxDelta(), new SetDomainMin(), true, sets);
}
}