1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.myfaces.trinidad.util; 20 21 import org.apache.myfaces.trinidad.logging.TrinidadLogger; 22 23 /** 24 * The FastMessageFormat class is a greatly reduced version 25 * of the java.text.MessageFormat class. It's also much faster 26 * and much less expensive to create, which is especially 27 * valuable when it is created and thrown away many times - 28 * a common use case in web applications. 29 * <p> 30 * The only syntax supported by this class is simple index-based 31 * replacement, namely: 32 * <pre> 33 * some{1}text{0}here{2}andthere 34 * </pre> 35 * Unlike MessageFormat, single quotes are NOT used for escaping. 36 * So, the following pattern could be used to include a left bracket: 37 * <pre> 38 * some{text{0} 39 * </pre> 40 * <p> 41 * @version $Name: $ ($Revision: adfrt/faces/adf-faces-api/src/main/java/oracle/adf/view/faces/util/FastMessageFormat.java#0 $) $Date: 10-nov-2005.19:08:37 $ 42 */ 43 public class FastMessageFormat 44 { 45 /** 46 * Creates a FastMessageFormat based on the given format string. 47 */ 48 public FastMessageFormat(String formatString) 49 { 50 if (formatString == null) 51 throw new NullPointerException(); 52 53 _formatText = formatString.toCharArray(); 54 } 55 56 57 /** 58 * This formatter will only replace patterns of the type "{[0-9]}" 59 * for which there is an associated token. 60 * Any other use of '{}' will be interpreted as literal text. 61 * This aims to have the same behavior as TrFastMessageFormatUtils.format 62 * on the client. 63 * <p> 64 * @param source an array of strings (tokens) 65 */ 66 public String format(Object[] source) 67 { 68 int formatLength = _formatText.length; 69 int length = 0; 70 int tokenCount = source.length; 71 for (int i = 0; i < tokenCount; i++) 72 { 73 Object sourceString = source[i]; 74 if (sourceString != null) 75 { 76 length += sourceString.toString().length(); 77 } 78 } 79 80 // The following buffer size is just an initial estimate. It is legal for 81 // any given pattern, such as {0}, to occur more than once, in which case 82 // the buffer size will expand automatically if need be. 83 StringBuilder buffer = new StringBuilder(length + formatLength); 84 85 int lastStart = 0; 86 for (int i = 0; i < formatLength; i++) 87 { 88 char ch = _formatText[i]; 89 if (ch == '{') 90 { 91 // Only check for single digit patterns that have an associated token. 92 if (i + 2 < formatLength && _formatText[i + 2] == '}') 93 { 94 int tokenIndex = _formatText[i + 1] - '0'; 95 if (tokenIndex >= 0 && tokenIndex < tokenCount) 96 { 97 buffer.append(_formatText, lastStart, i - lastStart); 98 Object sourceString = source[tokenIndex]; 99 if (sourceString != null) 100 buffer.append(sourceString.toString()); 101 102 i += 2; 103 lastStart = i + 1; 104 } 105 } 106 } 107 // ELSE: Do nothing. The character will be added in later. 108 } 109 110 buffer.append(_formatText, lastStart, formatLength - lastStart); 111 112 return new String(buffer); 113 } 114 115 private final char[] _formatText; 116 private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger( 117 FastMessageFormat.class); 118 } 119 120 121 122