| /* |
| * Copyright (c) 2004, 2018 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0, which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package javax.xml.bind.annotation.adapters; |
| |
| |
| |
| /** |
| * Built-in {@link XmlAdapter} to handle {@code xs:token} and its derived types. |
| * |
| * <p> |
| * This adapter removes leading and trailing whitespaces, then truncate any |
| * sequence of tab, CR, LF, and SP by a single whitespace character ' '. |
| * |
| * @author Kohsuke Kawaguchi |
| * @since 1.6, JAXB 2.0 |
| */ |
| public class CollapsedStringAdapter extends XmlAdapter<String,String> { |
| /** |
| * Removes leading and trailing whitespaces of the string |
| * given as the parameter, then truncate any |
| * sequence of tab, CR, LF, and SP by a single whitespace character ' '. |
| */ |
| public String unmarshal(String text) { |
| if(text==null) return null; // be defensive |
| |
| int len = text.length(); |
| |
| // most of the texts are already in the collapsed form. |
| // so look for the first whitespace in the hope that we will |
| // never see it. |
| int s=0; |
| while(s<len) { |
| if(isWhiteSpace(text.charAt(s))) |
| break; |
| s++; |
| } |
| if(s==len) |
| // the input happens to be already collapsed. |
| return text; |
| |
| // we now know that the input contains spaces. |
| // let's sit down and do the collapsing normally. |
| |
| StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ ); |
| |
| if(s!=0) { |
| for( int i=0; i<s; i++ ) |
| result.append(text.charAt(i)); |
| result.append(' '); |
| } |
| |
| boolean inStripMode = true; |
| for (int i = s+1; i < len; i++) { |
| char ch = text.charAt(i); |
| boolean b = isWhiteSpace(ch); |
| if (inStripMode && b) |
| continue; // skip this character |
| |
| inStripMode = b; |
| if (inStripMode) |
| result.append(' '); |
| else |
| result.append(ch); |
| } |
| |
| // remove trailing whitespaces |
| len = result.length(); |
| if (len > 0 && result.charAt(len - 1) == ' ') |
| result.setLength(len - 1); |
| // whitespaces are already collapsed, |
| // so all we have to do is to remove the last one character |
| // if it's a whitespace. |
| |
| return result.toString(); |
| } |
| |
| /** |
| * No-op. |
| * |
| * Just return the same string given as the parameter. |
| */ |
| public String marshal(String s) { |
| return s; |
| } |
| |
| |
| /** returns true if the specified char is a white space character. */ |
| protected static boolean isWhiteSpace(char ch) { |
| // most of the characters are non-control characters. |
| // so check that first to quickly return false for most of the cases. |
| if( ch>0x20 ) return false; |
| |
| // other than we have to do four comparisons. |
| return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20; |
| } |
| } |