sk.nociar.jpacloner.graphs.WildcardPattern Maven / Gradle / Ivy

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JPA Cloner allows cloning of JPA entity subgraphs.

There is a newer version: 1.0.3

package sk.nociar.jpacloner.graphs;

import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class WildcardPattern extends GraphExplorer {
	private static final Pattern p = Pattern.compile("\\*|\\?|[^\\*\\?]+");
	private static final Map cache = new HashMap();
	
	private final Pattern pattern;
	
	private final ConcurrentMap isMatched = new ConcurrentHashMap();

	private WildcardPattern(String s) {
		StringBuilder sb = new StringBuilder("^");
		Matcher m = p.matcher(s);
		while (m.find()) {
			String token = m.group();
			if ("?".equals(token)) {
				sb.append(".");
			} else if ("*".equals(token)) {
				sb.append(".*?"); // Reluctant quantifier
			} else {
				sb.append(Pattern.quote(token));
			}
		}
		sb.append("$");
		pattern = Pattern.compile(sb.toString());
	}
	
	public static synchronized WildcardPattern get(String s) {
		WildcardPattern wildcardPattern = cache.get(s);
		if (wildcardPattern == null) {
			wildcardPattern = new WildcardPattern(s);
			cache.put(s, wildcardPattern);
		}
		return wildcardPattern;
	}

	@Override
	public Set explore(Collection entities, EntityExplorer entityExplorer) {
		Set