RegexHandler.java

package message.validate.handler;

import message.utils.StringUtils;
import message.validate.annotations.Regex;
import message.validate.core.ValidateHandler;
import message.validate.exception.EmptyRegexPattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.annotation.Annotation;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 正则表达式验证处理类.
 *
 * @author sunhao(sunhao.java@gmail.com)
 * @version V1.0
 * @createTime 12-11-26 下午9:37
 */
public class RegexHandler extends ValidateHandler {
    private static final Logger logger = LoggerFactory.getLogger(RegexHandler.class);

    protected boolean handle(Annotation annotation, Object value) {
        if(!(value instanceof String)){
            logger.error("is not string!");
            return false;
        }
        Regex regex = (Regex) annotation;
        String regexPattern = regex.regex();
        if(StringUtils.isEmpty(regexPattern)){
            logger.error("given empty regex string!");
            throw new EmptyRegexPattern(10011, "regex pattern string is null!");
        }

        if(logger.isDebugEnabled())
            logger.debug("the regex pattern is '{}'!", regexPattern);

        Pattern pattern = Pattern.compile(regexPattern);
        Matcher matcher = pattern.matcher((String) value);

        return matcher.matches();
    }
}