/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.cache.util;

import java.util.regex.Pattern;

import lucee.commons.io.cache.CacheKeyFilter;

import org.apache.oro.text.regex.MalformedPatternException;


/**
 * Wildcard Filter
 */
public class WildCardFilter implements CacheKeyFilter {
    
    private static final String specials="{}[]().+\\^$";
    
	private final Pattern pattern;
	private final String wildcard;

	private boolean ignoreCase;


    /**
     * @param wildcard
     * @throws MalformedPatternException
     */
    public WildCardFilter(String wildcard,boolean ignoreCase) {
        this.wildcard=wildcard;
        this.ignoreCase=ignoreCase;
        StringBuilder sb = new StringBuilder(wildcard.length());
        int len=wildcard.length();
        
        for(int i=0;i<len;i++) {
            char c = wildcard.charAt(i);
            if(c == '*')sb.append(".*");
            else if(c == '?') sb.append('.');
            else if(specials.indexOf(c)!=-1)sb.append('\\').append(c);
            else sb.append(c);
        }
        pattern=Pattern.compile(ignoreCase?sb.toString().toLowerCase():sb.toString());
        //pattern=new Perl5Compiler().compile(ignoreCase?sb.toString().toLowerCase():sb.toString());
    }

	@Override
	public boolean accept(String key) {
		return pattern.matcher(ignoreCase?key.toLowerCase():key).matches();
	}

    @Override
	public String toString() {
		return "Wildcardfilter:"+wildcard;
	}

	@Override
	public String toPattern() {
		return wildcard;
	}
}