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package bjc.utils.funcutils;
/**
* Utility methods for operations on strings
*
* @author ben
*
*/
public class StringUtils {
/**
* Check if a string consists only of one or more matches of a regular
* expression
*
* @param input
* The string to check
* @param regex
* The regex to see if the string only contains matches of
* @return Whether or not the string consists only of multiple matches
* of the provided regex
*/
public static boolean containsOnly(String input, String regex) {
/*
* This regular expression is fairly simple.
*
* First, we match the beginning of the string. Then, we start a
* non-capturing group whose contents are the passed in regex. That
* group is then matched one or more times and the pattern matches
* to the end of the string
*/
if (input == null) {
throw new NullPointerException("Input must not be null");
} else if (regex == null) {
throw new NullPointerException("Regex must not be null");
}
return input.matches("\\A(?:" + regex + ")+\\Z");
}
/**
* Checks if the given expression contains the specified operator in a
* situation that indicates its use as an infix operator.
*
* @param expression
* The expression to check
* @param operator
* The operator to see if it is contained
* @return Whether or not the given expression contains the specified
* operator as a infix operator
*/
public static boolean containsInfixOperator(String expression,
String operator) {
// Bit annoying to have to use a full class name, but what are you
// going to do?
return org.apache.commons.lang3.StringUtils
.countMatches(expression, operator) == 1
&& !expression.equalsIgnoreCase(operator)
&& !expression.startsWith(operator);
}
}
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