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@ -17,42 +17,169 @@
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package org.apache.dolphinscheduler.common.utils; |
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import java.util.Collection; |
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import java.util.Iterator; |
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/** |
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* java.lang.String utils class
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*/ |
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public class StringUtils { |
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/** |
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* The empty String {@code ""}. |
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*/ |
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public static final String EMPTY = ""; |
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private StringUtils() { |
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throw new UnsupportedOperationException("Construct StringUtils"); |
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} |
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/** |
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* <p>Checks if a CharSequence is empty ("") or null.</p> |
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* |
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* @param cs the CharSequence to check, may be null |
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* @return {@code true} if the CharSequence is empty or null |
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*/ |
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public static boolean isEmpty(final CharSequence cs) { |
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return cs == null || cs.length() == 0; |
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} |
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/** |
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* <p>Checks if a CharSequence is not empty ("") and not null.</p> |
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* |
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* @param cs the CharSequence to check, may be null |
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* @return {@code true} if the CharSequence is not empty and not null |
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*/ |
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public static boolean isNotEmpty(final CharSequence cs) { |
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return !isEmpty(cs); |
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} |
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public static boolean isBlank(String s) { |
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if (isEmpty(s)) { |
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/** |
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* <p>Checks if a CharSequence is empty (""), null or whitespace only.</p> |
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* |
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* @param cs the CharSequence to check, may be null |
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* @return {@code true} if the CharSequence is null, empty or whitespace only |
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*/ |
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public static boolean isBlank(final CharSequence cs) { |
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int strLen; |
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if (cs == null || (strLen = cs.length()) == 0) { |
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return true; |
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} |
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return s.trim().length() == 0; |
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for (int i = 0; i < strLen; i++) { |
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if (!Character.isWhitespace(cs.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 boolean isNotBlank(String s) { |
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return !isBlank(s); |
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/** |
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* <p>Checks if a CharSequence is not empty (""), not null and not whitespace only.</p> |
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* |
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* @param cs the CharSequence to check, may be null |
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* @return {@code true} if the CharSequence is not empty and not null and not whitespace only |
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*/ |
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public static boolean isNotBlank(final CharSequence cs) { |
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return !isBlank(cs); |
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} |
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/** |
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* <p>Replace all strings matching the regular expression \t \n \r with _</p> |
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* |
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* @param src the String , may be null |
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* @return the string that has been replaced |
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*/ |
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public static String replaceNRTtoUnderline(String src) { |
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if (isBlank(src)) { |
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return src; |
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} else { |
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return src.replaceAll("[\n|\r|\t]", "_"); |
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} |
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return isBlank(src) ? src : src.replaceAll("[\n|\r|\t]", "_"); |
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} |
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public static String trim(String str) { |
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/** |
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* <p>Removes control characters (char <= 32) from both |
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* ends of this String, handling {@code null} by returning |
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* {@code null}.</p> |
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* |
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* @param str the String to be trimmed, may be null |
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* @return the trimmed string, {@code null} if null String input |
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*/ |
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public static String trim(final String str) { |
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return str == null ? null : str.trim(); |
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} |
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/** |
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* <p>Returns either the passed in CharSequence, or if the CharSequence is |
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* whitespace, empty ("") or {@code null}, the value of {@code defaultStr}.</p> |
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* |
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* @param <T> the specific kind of CharSequence |
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* @param str the CharSequence to check, may be null |
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* @param defaultStr the default CharSequence to return |
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* if the input is whitespace, empty ("") or {@code null}, may be null |
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* @return the passed in CharSequence, or the default |
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*/ |
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public static <T extends CharSequence> T defaultIfBlank(final T str, final T defaultStr) { |
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return isBlank(str) ? defaultStr : str; |
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} |
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/** |
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* <p>Compares two String, returning {@code true} if they represent |
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* equal string, ignoring case.</p> |
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* |
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* @param str1 the first String, may be null |
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* @param str2 the second String, may be null |
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* @return {@code true} if the String are equal, case insensitive, or |
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* both {@code null} |
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*/ |
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public static boolean equalsIgnoreCase(String str1, String str2) { |
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return str1 == null ? str2 == null : str1.equalsIgnoreCase(str2); |
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} |
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/** |
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* <p>Joins the elements of the provided Collection into a single String |
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* containing the provided Collection of elements.</p> |
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* |
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* @param collection the collection, may be null |
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* @param separator the separator |
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* @return a single String |
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*/ |
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public static String join(Collection<?> collection, String separator) { |
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return collection == null ? null : join(collection.iterator(), separator); |
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} |
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/** |
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* <p>Joins the elements of the provided Iterator into a single String |
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* containing the provided Iterator of elements.</p> |
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* |
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* @param iterator the iterator, may be null |
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* @param separator the separator |
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* @return a single String |
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*/ |
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public static String join(Iterator<?> iterator, String separator) { |
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if (iterator == null) { |
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return null; |
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} else if (!iterator.hasNext()) { |
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return ""; |
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} else { |
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Object first = iterator.next(); |
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if (!iterator.hasNext()) { |
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return first == null ? "" : first.toString(); |
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} else { |
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StringBuilder buf = new StringBuilder(256); |
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if (first != null) { |
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buf.append(first); |
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} |
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while (iterator.hasNext()) { |
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if (separator != null) { |
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buf.append(separator); |
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} |
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Object obj = iterator.next(); |
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if (obj != null) { |
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buf.append(obj); |
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} |
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} |
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return buf.toString(); |
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} |
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} |
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} |
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} |
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zhuangchong
3 years ago
committed by
GitHub