com.softicar.platform.common.core.number.parser.IntegerParser Maven / Gradle / Ivy
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package com.softicar.platform.common.core.number.parser;
import com.softicar.platform.common.core.utils.DevNull;
import java.util.Optional;
/**
* Utility methods for parsing {@link Integer}.
*
* @author Oliver Richers
*/
public class IntegerParser {
/**
* Checks if the given string is a valid {@link Integer} number.
*
* If the given string is null, this method returns false.
*
* This method also returns false if the actual integer cannot be
* represented by {@link Integer}, that is, it is less than
* {@link Integer#MIN_VALUE} or greater than {@link Integer#MAX_VALUE}.
*
* @param string
* the string to parse (may be null)
* @return true if the given string is a valid {@link Integer} literal
*/
public static boolean isInteger(String string) {
return parse(string).isPresent();
}
/**
* Tries to parse the given string into an {@link Integer}.
*
* This method returns {@link Optional#empty()} if the given string cannot
* be parsed into a valid integer in the range [{@link Integer#MIN_VALUE},
* {@link Integer#MAX_VALUE}].
*
* If the given string is null, this method also returns
* {@link Optional#empty()}.
*
* @param string
* the string to parse (may be null)
* @return a {@link Optional} holding the parsed integer value or not
*/
public static Optional parse(String string) {
if (string == null) {
return Optional.empty();
}
try {
return Optional.of(Integer.parseInt(string));
} catch (NumberFormatException exception) {
DevNull.swallow(exception);
return Optional.empty();
}
}
public static Integer parseInteger(String string) {
return parse(string).orElse(null);
}
}