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Microsoft JDBC Driver for SQL Server. The Azure Key Vault feature in Microsoft JDBC Driver for SQL Server depends on Azure SDK for JAVA and Azure Active Directory Library For Java.

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/*
 * Microsoft JDBC Driver for SQL Server
 * 
 * Copyright(c) Microsoft Corporation All rights reserved.
 * 
 * This program is made available under the terms of the MIT License. See the LICENSE file in the project root for more information.
 */

package com.microsoft.sqlserver.jdbc;

/**
 * Utility class for Strings.
 * 
 * @since 6.1.2
 */
public class StringUtils {

    public static final String SPACE = " ";

    public static final String EMPTY = "";

    /**
     * Developer should not create {@code StringUtils} instance in standard programming. Instead, the class should be used as
     * {@code StringUtils.isEmpty("String")}
     */
    private StringUtils() {
        // Hiding constructor.
    }

    /**
     * Checks if String is null
     * 
     * @param charSequence
     *            {@link CharSequence} Can provide null
     * @return {@link Boolean} if provided char sequence is null or empty / blank
     * @since 6.1.2
     */
    public static boolean isEmpty(final CharSequence charSequence) {
        return charSequence == null || charSequence.length() == 0;
    }
    
    /**
     * Check if String is numeric or not. 
     * @param str {@link String} 
     * @return {@link Boolean} if provided String is numeric or not.
     */
    public static boolean isNumeric(final String str) {
        return !isEmpty(str) && str.matches("\\d+(\\.\\d+)?");
    }
    
    /**
     * Check if string is integer or not
     * @param str {@link String} 
     * @return {@link Boolean} if provided String is Integer or not.
     */
    public static boolean isInteger(final String str) {
        try {
            Integer.parseInt(str);
            return true;
        }
        catch (NumberFormatException e) {
            // Nothing. this is not integer.
        }
        return false;
    }

}