package org.yzh.commons.util;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.util.*;
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/**
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* @author yezhihao
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* https://gitee.com/yezhihao/jt808-server
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*/
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public class StrUtils {
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public static final int[] EMPTY = new int[0];
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public static final Integer[] EMPTY_ = new Integer[0];
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public static int[] toInts(String str, String delimiter) {
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String[] split = str.split(delimiter);
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int[] result = new int[split.length];
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for (int i = 0; i < split.length; i++)
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result[i] = Integer.parseInt(split[i]);
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return result;
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}
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public static double[] toDoubles(String str, String delimiter) {
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String[] split = str.split(delimiter);
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double[] result = new double[split.length];
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for (int i = 0; i < split.length; i++)
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result[i] = Double.parseDouble(split[i]);
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return result;
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}
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public static byte[] toBytes(String str, String delimiter) {
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String[] split = str.split(delimiter);
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byte[] result = new byte[split.length];
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for (int i = 0; i < split.length; i++)
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result[i] = (byte) Integer.parseInt(split[i]);
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return result;
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}
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public static String merge(String delimiter, Collection value) {
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if (value == null || value.size() == 0)
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return null;
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StringBuilder result = new StringBuilder(value.size() * 5);
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for (Object id : value)
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result.append(id).append(delimiter);
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return result.substring(0, result.length() - 1);
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}
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public static String merge(String delimiter, Object... value) {
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if (value == null || value.length == 0)
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return null;
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StringBuilder result = new StringBuilder(value.length * 5);
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for (Object id : value)
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result.append(id).append(delimiter);
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return result.substring(0, result.length() - 1);
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}
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public static String merge(String delimiter, int... value) {
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if (value == null || value.length == 0)
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return null;
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StringBuilder result = new StringBuilder(value.length * 5);
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for (int id : value)
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result.append(id).append(delimiter);
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return result.substring(0, result.length() - 1);
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}
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public static int[] toInts(Integer[] src) {
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if (src == null || src.length == 0)
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return EMPTY;
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int[] dest = new int[src.length];
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for (int i = 0; i < src.length; i++)
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dest[i] = src[i];
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return dest;
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}
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public static Integer[] toInts(int[] src) {
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if (src == null || src.length == 0)
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return EMPTY_;
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Integer[] dest = new Integer[src.length];
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for (int i = 0; i < src.length; i++)
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dest[i] = src[i];
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return dest;
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}
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public static Integer parseInt(String num) {
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return parseInt(num, null);
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}
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public static Integer parseInt(String num, Integer defVal) {
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if (isBlank(num))
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return defVal;
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try {
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return Integer.parseInt(num);
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} catch (NumberFormatException e) {
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return defVal;
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}
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}
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public static String toUnderline(String str) {
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StringBuilder result = new StringBuilder(str.length() + 4);
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char[] chars = str.toCharArray();
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result.append(Character.toLowerCase(chars[0]));
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for (int i = 1; i < chars.length; i++) {
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char c = chars[i];
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if (Character.isUpperCase(c))
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result.append('_').append(Character.toLowerCase(c));
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else
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result.append(c);
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}
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return result.toString();
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}
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public static String subPrefix(String str, String prefix) {
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if (str != null && str.startsWith(prefix))
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str = str.substring(prefix.length());
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return str;
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}
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public static Map newMap(Object... entrys) {
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Map result = new HashMap((int) (entrys.length / 1.5) + 1);
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for (int i = 0; i < entrys.length; )
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result.put(entrys[i++], entrys[i++]);
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return result;
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}
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public static boolean isNotBlank(String str) {
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return !isBlank(str);
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}
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public static boolean isBlank(String str) {
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return str == null || str.length() == 0 || str.trim().length() == 0;
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}
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public static <T> T getDefault(T value, T defaultValue) {
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return value != null ? value : defaultValue;
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}
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public static String leftPad(String str, int size, char ch) {
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int length = str.length();
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int pads = size - length;
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if (pads > 0) {
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char[] result = new char[size];
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str.getChars(0, length, result, pads);
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while (pads > 0)
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result[--pads] = ch;
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return new String(result);
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}
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return str;
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}
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public static int[] toArray(Collection<Integer> list) {
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if (list == null || list.isEmpty())
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return null;
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int[] result = new int[list.size()];
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int i = 0;
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for (Integer e : list) {
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if (e != null)
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result[i++] = e;
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}
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return result;
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}
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public static Set<Integer> toSet(int... num) {
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if (num == null || num.length == 0) {
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return Collections.EMPTY_SET;
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}
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Set<Integer> result;
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if (num.length <= 3) {
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result = new TreeSet<>();
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} else {
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result = new HashSet<>(num.length << 1);
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}
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for (int i : num) {
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result.add(i);
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}
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return result;
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}
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public static boolean isNum(String val) {
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if (isBlank(val)) {
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return false;
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}
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int sz = val.length();
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for (int i = 0; i < sz; i++) {
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if (!Character.isDigit(val.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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public static String getStackTrace(final Throwable throwable) {
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final StringWriter sw = new StringWriter(7680);
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final PrintWriter pw = new PrintWriter(sw, true);
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throwable.printStackTrace(pw);
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return sw.getBuffer().toString();
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}
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private static final char[] hexCode = "0123456789abcdef".toCharArray();
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public static String bytes2Hex(byte[] bytes) {
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char[] hex = new char[bytes.length << 1];
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for (int j = 0, i = 0; i < bytes.length; i++) {
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byte b = bytes[i];
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hex[j++] = hexCode[(b >> 4) & 0xF];
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hex[j++] = hexCode[(b & 0xF)];
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}
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return new String(hex);
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}
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public static byte[] hex2Bytes(String hex) {
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final int len = hex.length();
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if (len % 2 != 0) {
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throw new IllegalArgumentException("hexBinary needs to be even-length: " + hex);
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}
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byte[] out = new byte[len >> 1];
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for (int i = 0; i < len; i += 2) {
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int h = hexToBin(hex.charAt(i));
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int l = hexToBin(hex.charAt(i + 1));
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if (h == -1 || l == -1) {
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throw new IllegalArgumentException("contains illegal character for hexBinary: " + hex);
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}
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out[i >> 1] = (byte) (h * 16 + l);
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}
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return out;
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}
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public static int hexToBin(char ch) {
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if ('0' <= ch && ch <= '9') {
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return ch - '0';
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}
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if ('A' <= ch && ch <= 'F') {
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return ch - ('A' - 10);
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}
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if ('a' <= ch && ch <= 'f') {
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return ch - ('a' - 10);
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}
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return -1;
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}
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}
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