org.axe.util.StringUtil.java Source code

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Here is the source code for org.axe.util.StringUtil.java

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/**
 * MIT License
 * 
 * Copyright (c) 2017 CaiDongyu
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.axe.util;

import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;

/**
 * @author CaiDongyu on 2016/4/8.
 */
public final class StringUtil {
    private StringUtil() {
    }

    public static String appendZero(String base, int returnLength) {
        StringBuilder buf = new StringBuilder(base);
        while (buf.length() < returnLength) {
            buf.append("0");
        }
        String result = buf.toString();
        buf.delete(0, buf.length());
        return result;
    }

    public static String aheadZero(String base, int returnLength) {
        StringBuilder buf = new StringBuilder(base);
        while (buf.length() < returnLength) {
            buf.insert(0, "0");
        }
        String result = buf.toString();
        buf.delete(0, buf.length());
        return result;
    }

    /**
     * ??
     */
    public static List<String> sortStringSet(Set<String> stringSet) {
        LinkedList<String> sortList = new LinkedList<>();
        if (stringSet != null && stringSet.size() > 0) {
            for (String str : stringSet) {
                if (sortList.size() == 0) {
                    sortList.add(str);
                    continue;
                }

                int j = 0;
                for (; j < sortList.size(); j++) {
                    String sortStr = sortList.get(j);
                    if (str.compareTo(sortStr) <= 0) {
                        sortList.add(j, str);
                        break;
                    }
                }
                if (j == sortList.size()) {
                    sortList.add(str);
                }
            }
        }
        return sortList;
    }

    /**
     * ??
     */
    public static List<String> sortStringList(List<String> stringList) {
        LinkedList<String> sortList = new LinkedList<>();
        if (CollectionUtil.isNotEmpty(stringList)) {
            for (String str : stringList) {
                if (sortList.size() == 0) {
                    sortList.add(str);
                    continue;
                }
                int j = 0;
                for (; j < sortList.size(); j++) {
                    String sortStr = sortList.get(j);
                    if (str.compareTo(sortStr) <= 0) {
                        sortList.add(j, str);
                        break;
                    }
                }
                if (j == sortList.size()) {
                    sortList.add(str);
                }
            }
        }
        return sortList;
    }

    public static List<String> sortStringAry(String[] stringAry) {
        LinkedList<String> sortList = new LinkedList<>();
        if (stringAry != null && stringAry.length > 0) {
            for (String str : stringAry) {
                if (sortList.size() == 0) {
                    sortList.add(str);
                    continue;
                }
                int j = 0;
                for (; j < sortList.size(); j++) {
                    String sortStr = sortList.get(j);
                    if (str.compareTo(sortStr) <= 0) {
                        sortList.add(j, str);
                        break;
                    }
                }
                if (j == sortList.size()) {
                    sortList.add(str);
                }
            }
        }
        return sortList;
    }

    public static boolean isEmpty(String str) {
        if (str != null) {
            str = str.trim();
        }
        return StringUtils.isEmpty(str);
    }

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

    public static final char UNDERLINE = '_';

    public static String camelToUnderline(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (Character.isUpperCase(c)) {
                if (i > 0) {
                    sb.append(UNDERLINE);
                }
                sb.append(Character.toLowerCase(c));
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    public static String underlineToCamel(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c == UNDERLINE) {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * ??
     * 
     * @param length
     * @return
     */
    public static String getRandomString(int length) { // length?
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        return getRandomString(length, base);
    }

    public static String getRandomString(int length, String charSource) { // length?
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(charSource.length());
            sb.append(charSource.charAt(number));
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        // System.out.println(camelToUnderline("SetAbC1d"));
        // System.out.println(underlineToCamel("set_ab_c1d"));
        System.out.println(getRandomString(8));
    }
}