ca.uhn.hl7v2.util.StringUtil Maven / Gradle / Ivy
package ca.uhn.hl7v2.util;
/**
* Various string utility methods
*/
public class StringUtil {
/**
* Counts the number of lines in a string by counting the number of "\n" or
* "\r" or "\r\n" sequences which appear in it
*/
public static int countLines(String theString) {
int retVal = 1;
for (int i = 0; i < theString.length(); i++) {
char nextChar = theString.charAt(i);
if (i > 0 && nextChar == '\n' && theString.charAt(i - 1) == '\r') {
continue;
}
if (nextChar == '\r' | nextChar == '\n') {
retVal++;
}
}
return retVal;
}
/**
* Removes any line separators (\r ot \n) from the end of a string and
* returns that string
*/
public static String chomp(String theLine) {
int i;
int start = theLine.length() - 1;
for (i = start; i >= 0; i--) {
char nextChar = theLine.charAt(i);
if (nextChar != '\r' && nextChar != '\n') {
break;
}
}
if (i == start) {
return theLine;
} else {
return theLine.substring(0, i + 1);
}
}
/**
* Throws an IllegalArgumentException if the value is an empty string or
* null
*/
public static void validateNotEmpty(String theValue) {
if (theValue == null || theValue.length() == 0) {
throw new IllegalArgumentException();
}
}
/**
* Search within a string and replace one substring with another. Based on
* the method within Commons-Lang StringUtils.
*/
public static String replace(String theString, String theMatch, String theReplacement) {
StringBuffer buf = new StringBuffer(theString.length());
int start = 0, end = 0;
while ((end = theString.indexOf(theMatch, start)) != -1) {
buf.append(theString.substring(start, end)).append(theReplacement);
start = end + theMatch.length();
}
buf.append(theString.substring(start));
return buf.toString();
}
public static String[] concatenate(String[] array1, String[] array2) {
if (array1 == null) return array2;
if (array2 == null) return array1;
String[] result = new String[array1.length + array2.length];
System.arraycopy(array1, 0, result, 0, array1.length);
System.arraycopy(array2, 0, result, array1.length, array2.length);
return result;
}
/**
* Returns true if the string is null, or contains no non-whitespace characters
*/
public static boolean isBlank(String theString) {
if (theString == null) {
return true;
}
for (int i = 0; i < theString.length(); i++) {
if (Character.isWhitespace(theString.charAt(i)) == false) {
return false;
}
}
return true;
}
/**
* Inverse of {@link #isBlank(String)}
*/
public static boolean isNotBlank(String theString) {
return !isBlank(theString);
}
}