| /* |
| * Copyright (c) 2014, 2020 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Tomas Kraus - Initial API and implementation |
| package org.eclipse.persistence.internal.helper; |
| |
| /** |
| * INTERNAL: |
| * <p><b>Purpose</b>: Define any useful {@link String} constants and methods that are missing from the base Java.</p> |
| */ |
| public class StringHelper { |
| |
| /** Horizontal tab. */ |
| public static final char TAB = '\t'; |
| |
| /** Line feed. */ |
| public static final char LF = '\n'; |
| |
| /** Form feed */ |
| public static final char FF = '\f'; |
| |
| /** Carriage return */ |
| public static final char CR = '\r'; |
| |
| /** Space. */ |
| public static final char SPACE = ' '; |
| |
| /** Left brace. */ |
| public static final char LEFT_BRACE = '{'; |
| |
| /** Right brace. */ |
| public static final char RIGHT_BRACE = '}'; |
| |
| /** Left bracket. */ |
| public static final char LEFT_BRACKET = '('; |
| |
| /** Right bracket. */ |
| public static final char RIGHT_BRACKET = ')'; |
| |
| /** Dot. */ |
| public static final char DOT = '.'; |
| |
| /** Vertical bar. */ |
| public static final char VERTICAL_BAR = '|'; |
| |
| /** Vertical bar. */ |
| public static final char QUESTION_MARK = '?'; |
| |
| /** Empty {@link String}. */ |
| public static final String EMPTY_STRING = ""; |
| |
| /** <code>"null"</code> {@link String}. */ |
| public static final String NULL_STRING = "null"; |
| |
| /** |
| * Never return null but replace it with <code>"null"</code> {@link String}. |
| * @param str String to be checked for null and eventually replaced with |
| * <code>"null"</code> {@link String}. |
| * @return Provided string when not null or <code>"null"</code> {@link String}. |
| */ |
| public static final String nonNullString(String str) { |
| return str != null ? str : NULL_STRING; |
| } |
| |
| /** |
| * Checks if {@link String} is {@code null}, is empty ({@code ""}) or contains white spaces only. |
| * @param str {@link String} to be checked. |
| * @return Value of {@code true} if @link String} is {@code null}, is empty ({@code ""}) or contains white spaces |
| * only or {@code false} otherwise |
| */ |
| public static final boolean isBlank(final String str) { |
| return str == null || str.trim().length() == 0; |
| } |
| } |