package com.easyjf.util.regx;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 * 過濾實(shí)現(xiàn)
 * @author
 *
 */
public class RegFilterBuilder implements FilterBuilder {

	private String regex = null;

	private String rpStr = null;

	private String source = null;

	private String result = null;

	public RegFilterBuilder(String regex, String rpStr, String source) {
		super();
		this.regex = regex;
		this.rpStr = rpStr;
		this.source = source;
	}

	public void buildFilter() {
		if (this.regex == null) {
			return;
		}
		Pattern p = Pattern.compile(regex, 2);
		Matcher matcher = p.matcher(this.source);
		StringBuffer sb = new StringBuffer();
		String tempString = rpStr;
		int rpL = rpStr.split("\\$[0-9]+").length;
		while (matcher.find()) {
			for (int i = 0; (i < rpL) && (i < matcher.groupCount()); i++) {
				tempString = tempString.replaceAll("\\$" + i, matcher.group(i));
			}
			matcher.appendReplacement(sb, tempString);
		}
		matcher.appendTail(sb);
		this.result = sb.toString();
	}

	public Filter getFilter() {
		return (new RegexFilter() {
			public String getFilteredStr() {
				return result;
			}
		});
	}

}