1 /* 2 * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.xml.bind.annotation.adapters; 27 28 29 30 /** 31 * Built-in {@link XmlAdapter} to handle <tt>xs:token</tt> and its derived types. 32 * 33 * <p> 34 * This adapter removes leading and trailing whitespaces, then truncate any 35 * sequnce of tab, CR, LF, and SP by a single whitespace character ' '. 36 * 37 * @author Kohsuke Kawaguchi 38 * @since JAXB 2.0 39 */ 40 public class CollapsedStringAdapter extends XmlAdapter<String,String> { 41 /** 42 * Removes leading and trailing whitespaces of the string 43 * given as the parameter, then truncate any 44 * sequnce of tab, CR, LF, and SP by a single whitespace character ' '. 45 */ 46 public String unmarshal(String text) { 47 if(text==null) return null; // be defensive 48 49 int len = text.length(); 50 51 // most of the texts are already in the collapsed form. 52 // so look for the first whitespace in the hope that we will 53 // never see it. 54 int s=0; 55 while(s<len) { 56 if(isWhiteSpace(text.charAt(s))) 57 break; 58 s++; 59 } 60 if(s==len) 61 // the input happens to be already collapsed. 62 return text; 63 64 // we now know that the input contains spaces. 65 // let's sit down and do the collapsing normally. 66 67 StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ ); 68 69 if(s!=0) { 70 for( int i=0; i<s; i++ ) 71 result.append(text.charAt(i)); 72 result.append(' '); 73 } 74 75 boolean inStripMode = true; 76 for (int i = s+1; i < len; i++) { 77 char ch = text.charAt(i); 78 boolean b = isWhiteSpace(ch); 79 if (inStripMode && b) 80 continue; // skip this character 81 82 inStripMode = b; 83 if (inStripMode) 84 result.append(' '); 85 else 86 result.append(ch); 87 } 88 89 // remove trailing whitespaces 90 len = result.length(); 91 if (len > 0 && result.charAt(len - 1) == ' ') 92 result.setLength(len - 1); 93 // whitespaces are already collapsed, 94 // so all we have to do is to remove the last one character 95 // if it's a whitespace. 96 97 return result.toString(); 98 } 99 100 /** 101 * No-op. 102 * 103 * Just return the same string given as the parameter. 104 */ 105 public String marshal(String s) { 106 return s; 107 } 108 109 110 /** returns true if the specified char is a white space character. */ 111 protected static boolean isWhiteSpace(char ch) { 112 // most of the characters are non-control characters. 113 // so check that first to quickly return false for most of the cases. 114 if( ch>0x20 ) return false; 115 116 // other than we have to do four comparisons. 117 return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20; 118 } 119 }