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package ca.pfv.spmf.algorithms.sequentialpatterns.gsp_AGP.items.patterns;
import java.util.ArrayList;
import java.util.List;
import ca.pfv.spmf.algorithms.sequentialpatterns.gsp_AGP.items.abstractions.ItemAbstractionPair;
/**
* This class is the implementation of a creator of patterns.
* By means this class, different kind of patterns can be used for this algorithm.
*
* Copyright Antonio Gomariz PeƱalver 2013
*
* This file is part of the SPMF DATA MINING SOFTWARE
* (http://www.philippe-fournier-viger.com/spmf).
*
* SPMF 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 3 of the License, or
* (at your option) any later version.
*
* SPMF 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 SPMF. If not, see <http://www.gnu.org/licenses/>.
*
* @author agomariz
*/
public class PatternCreator {
/**
* Static reference for make this class singleton
*/
private static PatternCreator instance = null;
//private static Map<Pattern, Pattern> patternPool = new HashMap<Pattern, Pattern>();
private PatternCreator() {
}
/**
* Get the only instance of PatternCreator is a singleton class
* @return the instance
*/
public static PatternCreator getInstance() {
if (instance == null) {
instance = new PatternCreator();
}
return instance;
}
/**
* It creates a pattern given a set of elements
* @param elements the list of element
* @return the created pattern
*/
public Pattern createPattern(List<ItemAbstractionPair> elements) {
Pattern newPattern = null;
if (elements == null) {
newPattern = new Pattern();
} else {
newPattern = new Pattern(elements);
}
/*Pattern existingPattern = patternPool.get(newPattern);
if (existingPattern == null) {
existingPattern = newPattern;
patternPool.put(newPattern, newPattern);
}
return existingPattern;*/
return newPattern;
}
/**
* It creates a pattern just composed of only one element
* @param pair the pair to be used to create the pattern
* @return the created pattern
*/
public Pattern createPattern(ItemAbstractionPair pair) {
List<ItemAbstractionPair> elements = new ArrayList<ItemAbstractionPair>();
elements.add(pair);
return createPattern(elements);
}
/**
* Standard method for creating a pattern
* @return the pattern created
*/
public Pattern createPattern() {
List<ItemAbstractionPair> list = null;
return createPattern(list);
}
public void clear() {
//patternPool.clear();
}
public static void sclear() {
//patternPool.clear();
}
}