com.duoec.doc.utils.StringUtils Maven / Gradle / Ivy

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package com.duoec.doc.utils;

import com.duoec.doc.constants.DuoDocletConstants;

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

/**
 * @author xuwenzhen
 */
public class StringUtils {
    private static final Pattern VALUE_PATTERN = Pattern.compile("^\"(.*)\"$");

    private StringUtils() {
    }

    public static boolean isEmpty(String str) {
        if (str == null) {
            return true;
        }

        return str.length() == 0;

    }

    public static boolean isNotEmpty(String str) {
        return !isEmpty(str);
    }

    public static String firstLine(String str) {
        if (isEmpty(str)) {
            return null;
        }
        return str.split(DuoDocletConstants.TURN_LINE_STRING)[0];
    }

    public static String afterFirstLine(String str) {
        if (isEmpty(str)) {
            return null;
        }
        int index = str.indexOf(DuoDocletConstants.TURN_LINE_STRING);
        if (index == -1) {
            return null;
        }
        return str.substring(index + 1);
    }

    public static Integer tryParseInt(String str) {
        if (isEmpty(str)) {
            return null;
        }
        final int sz = str.length();
        for (int i = 0; i < sz; i++) {
            if (!Character.isDigit(str.charAt(i))) {
                return null;
            }
        }
        return Integer.parseInt(str);
    }

    /**
     * 删除双引号
     *
     * @param str 字符串
     * @return 删除双引号后的字符串
     */
    public static String cleanQuotation(String str) {
        if (isEmpty(str)) {
            return str;
        }
        Matcher matcher = VALUE_PATTERN.matcher(str);
        if (matcher.find()) {
            return matcher.group(1);
        }
        return str;
    }

    public static String join(List list, String joiner) {
        if (CollectionUtils.isEmpty(list)) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        for (String s : list) {
            sb.append(s).append(joiner);
        }
        return sb.substring(0, sb.length() - joiner.length());
    }
}