001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.uon; 014 015import static org.apache.juneau.internal.StringUtils.*; 016 017import org.apache.juneau.internal.*; 018 019/** 020 * Utility methods for the UON and UrlEncoding serializers and parsers. 021 */ 022public final class UonUtils { 023 024 private static final AsciiSet needsQuoteChars = AsciiSet.create("),=\n\t\r\b\f "); 025 private static final AsciiSet maybeNeedsQuotesFirstChar = AsciiSet.create("),=\n\t\r\b\f tfn+-.#0123456789"); 026 027 /** 028 * Returns <jk>true</jk> if the specified string needs to be quoted per UON notation. 029 * 030 * <p> 031 * For example, strings that start with '(' or '@' or look like boolean or numeric values need to be quoted. 032 * 033 * @param s The string to test. 034 * @return <jk>true</jk> if the specified string needs to be quoted per UON notation. 035 */ 036 public static final boolean needsQuotes(String s) { 037 char c0 = s.isEmpty() ? 0 : s.charAt(0); 038 return ( 039 s.isEmpty() 040 || c0 == '@' 041 || c0 == '(' 042 || needsQuoteChars.contains(s) 043 || ( 044 maybeNeedsQuotesFirstChar.contains(c0) 045 && ( 046 "true".equals(s) 047 || "false".equals(s) 048 || "null".equals(s) 049 || isNumeric(s) 050 ) 051 ) 052 ); 053 } 054}