club.zhcs.utils.StringUtils Maven / Gradle / Ivy

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package club.zhcs.utils;

import java.util.ArrayList;
import java.util.List;

import org.nutz.castor.Castors;
import org.nutz.lang.Lang;
import org.nutz.lang.Strings;

/**
 * @author Ixion
 * 
 */
public class StringUtils {

    private StringUtils() {}

    /**
     * 字符串去除空白字符后从左到右按照一定位数插入字符
     * 
     * @param str
     *            源
     * @param n
     *            位数
     * @param sp
     *            插入字符
     * @return 字符串
     */
    public static String change(String str, int n, String sp) {
        StringBuilder info = new StringBuilder();
        String nstr = sTrim(str);
        for (int i = 0; i < nstr.length(); i++) {
            info.append(nstr.charAt(i));
            if (i > 0 && (i + 1) % n == 0) {
                info.append(sp);
            }
        }
        return info.toString();
    }

    public static String getString(Object obj) {
        return isNullOrEmpty(obj) ? "" : obj.toString();
    }

    public static boolean isNullOrEmpty(Object object) {
        return object == null || Strings.isBlank(object.toString());
    }

    /**
     * 字符串去除空白字符后从右到左按照一定位数插入字符
     * 
     * @param str
     *            源
     * @param n
     *            位数
     * @param sp
     *            插入字符
     * @return 字符串
     */
    public static String rChange(String str, int n, String sp) {
        StringBuilder info = new StringBuilder();
        String nstr = sTrim(str);
        for (int i = nstr.length() - 1; i >= 0; i--) {
            info.append(nstr.charAt(i));
            if ((nstr.length() - i) % n == 0) {
                info.append(sp);
            }
        }
        return info.toString();
    }

    /**
     * 去除全部空白
     * 
     * @param in
     *            输入字符串
     * @return 字符串
     */
    public static String sTrim(String in) {
        return in.replaceAll("\\s*", "");
    }

    /**
     * 将数字格式字符串转换成list
     * 
     * @param source
     *            源字符串，格式为1,2,3
     * @return 数字数组
     */
    public static List stringConvertList(String source) {
        return stringConvertList(source, Integer.class);
    }

    public static  List stringConvertList(String[] source, final Class clazz) {
        final List target = new ArrayList<>();
        Lang.each(source, (index, info, length) -> target.add(Castors.me().castTo(info, clazz)));
        return target;

    }

    public static String reverse(String info) {
        return new StringBuffer(info).reverse().toString();
    }

    public static  List stringConvertList(String source, Class clazz) {
        if (Strings.isBlank(source)) {
            return new ArrayList<>();
        }
        String[] infos = source.split(",");
        return stringConvertList(infos, clazz);
    }

    /**
     * 替换字符串中的占位符
     * 
     * @param openToken
     *            占位符开始标识
     * @param closeToken
     *            占位符结束标识
     * @param text
     *            原始文本
     * @param args
     *            参数
     * @return 替换结果
     */
    public static String replaceTokens(String openToken, String closeToken, String text, Object... args) {
        if (args == null || args.length <= 0) {
            return text;
        }
        int argsIndex = 0;
        if (text == null || text.isEmpty()) {
            return "";
        }
        char[] src = text.toCharArray();
        int offset = 0;
        // search open token
        int start = text.indexOf(openToken, offset);
        if (start == -1) {
            return text;
        }
        final StringBuilder builder = new StringBuilder();
        StringBuilder expression = null;
        while (start > -1) {
            if (start > 0 && src[start - 1] == '\\') {
                // this open token is escaped. remove the backslash and continue.
                builder.append(src, offset, start - offset - 1).append(openToken);
                offset = start + openToken.length();
            } else {
                // found open token. let's search close token.
                if (expression == null) {
                    expression = new StringBuilder();
                } else {
                    expression.setLength(0);
                }
                builder.append(src, offset, start - offset);
                offset = start + openToken.length();
                int end = text.indexOf(closeToken, offset);
                while (end > -1) {
                    if (end > offset && src[end - 1] == '\\') {
                        // this close token is escaped. remove the backslash and continue.
                        expression.append(src, offset, end - offset - 1).append(closeToken);
                        offset = end + closeToken.length();
                        end = text.indexOf(closeToken, offset);
                    } else {
                        expression.append(src, offset, end - offset);
                        offset = end + closeToken.length();
                        break;
                    }
                }
                if (end == -1) {
                    // close token was not found.
                    builder.append(src, start, src.length - start);
                    offset = src.length;
                } else {
                    String value = (argsIndex <= args.length - 1) ? nullOrString(argsIndex, args) : expression.toString();
                    builder.append(value);
                    offset = end + closeToken.length();
                    argsIndex++;
                }
            }
            start = text.indexOf(openToken, offset);
        }
        if (offset < src.length) {
            builder.append(src, offset, src.length - offset);
        }
        return builder.toString();
    }

    /**
     * @param argsIndex
     * @param args
     * @return
     */
    private static String nullOrString(int argsIndex, Object... args) {
        return args[argsIndex] == null ? "" : args[argsIndex].toString();
    }

    /**
     * 替换字符串中的占位符 ${} 形式
     * 
     * @param text
     *            原始文本
     * @param args
     *            参数
     * @return 替换结果
     */
    public static String replaceDollarBraceTokens(String text, Object... args) {
        return replaceTokens("${", "}", text, args);
    }

    /**
     * 替换字符串中的占位符 {} 形式
     * 
     * @param text
     *            原始文本
     * @param args
     *            参数
     * @return 替换结果
     */
    public static String replaceBraceTokens(String text, Object... args) {
        return replaceTokens("{", "}", text, args);
    }

}