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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License. You
 * may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.management.internal;


import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.gemstone.gemfire.management.ManagementException;

/**
 * This is a string pattern based Filter
 * with some limitations.
 * 
 * @author rishim
 *
 */

public class StringBasedFilter {
	
	private FilterParam params;

	private List exclusionPatternList;
	private List inclusionPatternList;

	/**
	 * 
	 */
	public StringBasedFilter(FilterParam params){
		this.params = params;
		exclusionPatternList = new ArrayList();
		inclusionPatternList = new ArrayList();

		compileFilterList(params.getExclusionList(), exclusionPatternList);
		compileFilterList(params.getInclusionList(), inclusionPatternList);
		
	}
	/**
	 * 
	 */

	public boolean isExcluded(String tokenToMatch) {
		if(params.isDefaultExcludeFilter()){
			return false;
		}
		tokenToMatch = formatStringTokens(tokenToMatch);
		for (Pattern pattern : exclusionPatternList) {
			Matcher matcher = pattern.matcher(tokenToMatch);
			if (matcher.find()) {
				return true;
			}
		}
		return false;
	}


	public boolean isIncluded(String tokenToMatch) {
		if(params.isDefaultIncludeFilter()){
			return true;
		}
		tokenToMatch = formatStringTokens(tokenToMatch);
		for (Pattern pattern : inclusionPatternList) {
			Matcher matcher = pattern.matcher(tokenToMatch);
			if (matcher.find()) {
				return true;
			}
		}
		return false;
	}

	private void compileFilterList(String[]  list, List patternList){

	
		for (String s : list) {
			try {
				s = formatStringTokens(s);
				Pattern pattern;
				if(s.contains("*")){
					pattern = Pattern.compile(s);
				}else{
					pattern = Pattern.compile(s,Pattern.LITERAL);
				}
				
				patternList.add(pattern);
			} catch (NullPointerException e) {
				throw new ManagementException(e);
			}
		}
	}
	
	
	private String formatStringTokens(String value) {

		value = value.replace('<', '-');
		value = value.replace('>', '-');
		value = value.replace('(', '-');
		value = value.replace(')', '-');

		if (value.length() < 1) {
			value = "nothing";
		}
		return value;
	}


}