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/*******************************************************************************
* Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.viatra.dse.api;
import org.eclipse.viatra.dse.api.strategy.impl.BestFirstStrategy;
import org.eclipse.viatra.dse.api.strategy.impl.BreadthFirstStrategy;
import org.eclipse.viatra.dse.api.strategy.impl.DepthFirstStrategy;
import org.eclipse.viatra.dse.api.strategy.impl.FixedPriorityStrategy;
import org.eclipse.viatra.dse.api.strategy.impl.HillClimbingStrategy;
import org.eclipse.viatra.dse.api.strategy.interfaces.IStrategy;
/**
* Helper class for instantiating strategies. To implement a new strategy use the {@link IStrategy} interface.
*
* @author Andras Szabolcs Nagy
*
*/
public final class Strategies {
private Strategies() {
}
/**
* Creates a depth-first search exploration strategy without a depth limit.
*
* @return The strategy.
* @see DepthFirstStrategy
*/
public static DepthFirstStrategy createDfsStrategy() {
return new DepthFirstStrategy();
}
/**
* Creates a depth-first search exploration strategy with a depth limit. A negative depth limit means no
* depth limit, zero means that it will check the initial state.
*
* @param depthLimit
* @return The strategy.
* @see DepthFirstStrategy
*/
public static DepthFirstStrategy createDfsStrategy(int depthLimit) {
return new DepthFirstStrategy(depthLimit);
}
/**
* Creates a fixed priority exploration strategy without a depth limit. It is a depth-first search exploration
* strategy but from a current state it only explores the activations with the highest priority. Priorities can be
* defined on the strategy itself.
*
* @return The strategy.
* @see FixedPriorityStrategy
*/
public static FixedPriorityStrategy createFixedPriorityStrategy() {
return createFixedPriorityStrategy(-1);
}
/**
* Creates a fixed priority exploration strategy with a depth limit, where a zero or negative depth limit means no
* depth limit. It is a depth-first search exploration strategy but from a current state it only explores the
* activations with the highest priority. Priorities can be defined on the strategy itself.
*
* @param depthLimit
* @return The strategy.
* @see FixedPriorityStrategy
*/
public static FixedPriorityStrategy createFixedPriorityStrategy(int depthLimit) {
return new FixedPriorityStrategy().withDepthLimit(depthLimit);
}
/**
* Creates a breadth-first search exploration strategy without a depth limit.
*
* @return The strategy.
* @see BreadthFirstStrategy
*/
public static BreadthFirstStrategy createBfsStrategy() {
return new BreadthFirstStrategy();
}
/**
* Creates a breadth-first search exploration strategy with a depth limit. A zero or negative depth limit means no
* depth limit.
*
* @param depthLimit
* @return The strategy.
* @see BreadthFirstStrategy
*/
public static BreadthFirstStrategy createBfsStrategy(int depthLimit) {
return new BreadthFirstStrategy(depthLimit);
}
/**
* Creates a hill climbing exploration strategy. By default, it explores all neighborhood states and chooses the
* best one to continue with until all neighborhood states are dominated by the current state. Other options are
* available on the strategy.
*
* @return The strategy.
* @see HillClimbingStrategy
*/
public static HillClimbingStrategy creatHillClimbingStrategy() {
return new HillClimbingStrategy();
}
/**
* See {@link BestFirstStrategy}.
*/
public static BestFirstStrategy createBestFirstStrategy() {
return new BestFirstStrategy();
}
/**
* See {@link BestFirstStrategy}.
*/
public static BestFirstStrategy createBestFirstStrategy(int depthLimit) {
return new BestFirstStrategy(depthLimit);
}
}
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