2018-06-19 07:15:37 +00:00
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package gui;
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import java.io.File;
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import java.util.List;
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import java.util.Map;
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import org.apache.commons.lang3.math.NumberUtils;
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public class ValidationUtil {
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public static boolean isNumber(String value) {
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2018-06-27 08:14:40 +00:00
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//return NumberUtils.isCreatable(value);
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return NumberUtils.isNumber(value);
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2018-06-19 07:15:37 +00:00
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}
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/**
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* Checks if an object is empty or null. Null part is especially important,
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* since Java's built-in isEmpty() methods don't check for this condition
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* and throw a nullPointerException as a result.
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* <p>
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* Supported structures:
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* <ul>
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* <li>String: empty if null or length is zero</li>
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* <li>List: empty if null or size() == 0</li>
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* <li>Map: empty if null or if it contains no keys, or if all keys map to an empty value </li>
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* </ul>
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*/
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public static boolean isEmpty(Object o) {
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if (o == null) {
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return true;
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}
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if (o instanceof String) {
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if (((String) o).length() == 0) {
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return true;
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}
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}
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if (o instanceof List) {
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if (((List) o).isEmpty()) {
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return true;
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}
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}
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if (o instanceof Map) {
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if (((Map) o).keySet().isEmpty()) {
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return true;
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} else {
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for (Object val : ((Map) o).values()) {
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if (!isEmpty(val)) {
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// if map contains any value that isn't empty, the map isn't considered empty
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return false;
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}
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}
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}
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}
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return false;
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}
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public static boolean isNotEmpty(Object o) {
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return !isEmpty(o);
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}
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/**
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* Checks whether a given File is a folder for which we have appropriate permission
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*/
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public static boolean isValidDirectory(File f) {
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return f.isDirectory() && f.canRead() && f.canWrite();
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}
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/**
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* Checks whether a given File is a folder for which we have appropriate permission
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*/
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public static boolean isReadableDirectory(File f) {
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return f.isDirectory() && f.canRead();
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}
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}
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