ohair@286: /*
mkos@397:  * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package javax.xml.bind.annotation.adapters;
ohair@286: 
ohair@286: 
ohair@286: 
ohair@286: /**
ohair@286:  * Built-in {@link XmlAdapter} to handle <tt>xs:token</tt> and its derived types.
ohair@286:  *
ohair@286:  * <p>
ohair@286:  * This adapter removes leading and trailing whitespaces, then truncate any
ohair@286:  * sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
ohair@286:  *
ohair@286:  * @author Kohsuke Kawaguchi
ohair@286:  * @since JAXB 2.0
ohair@286:  */
ohair@286: public class CollapsedStringAdapter extends XmlAdapter<String,String> {
ohair@286:     /**
ohair@286:      * Removes leading and trailing whitespaces of the string
ohair@286:      * given as the parameter, then truncate any
ohair@286:      * sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
ohair@286:      */
ohair@286:     public String unmarshal(String text) {
ohair@286:         if(text==null)  return null;        // be defensive
ohair@286: 
ohair@286:         int len = text.length();
ohair@286: 
ohair@286:         // most of the texts are already in the collapsed form.
ohair@286:         // so look for the first whitespace in the hope that we will
ohair@286:         // never see it.
ohair@286:         int s=0;
ohair@286:         while(s<len) {
ohair@286:             if(isWhiteSpace(text.charAt(s)))
ohair@286:                 break;
ohair@286:             s++;
ohair@286:         }
ohair@286:         if(s==len)
ohair@286:             // the input happens to be already collapsed.
ohair@286:             return text;
ohair@286: 
ohair@286:         // we now know that the input contains spaces.
ohair@286:         // let's sit down and do the collapsing normally.
ohair@286: 
mkos@397:         StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ );
ohair@286: 
ohair@286:         if(s!=0) {
ohair@286:             for( int i=0; i<s; i++ )
ohair@286:                 result.append(text.charAt(i));
ohair@286:             result.append(' ');
ohair@286:         }
ohair@286: 
ohair@286:         boolean inStripMode = true;
ohair@286:         for (int i = s+1; i < len; i++) {
ohair@286:             char ch = text.charAt(i);
ohair@286:             boolean b = isWhiteSpace(ch);
ohair@286:             if (inStripMode && b)
ohair@286:                 continue; // skip this character
ohair@286: 
ohair@286:             inStripMode = b;
ohair@286:             if (inStripMode)
ohair@286:                 result.append(' ');
ohair@286:             else
ohair@286:                 result.append(ch);
ohair@286:         }
ohair@286: 
ohair@286:         // remove trailing whitespaces
ohair@286:         len = result.length();
ohair@286:         if (len > 0 && result.charAt(len - 1) == ' ')
ohair@286:             result.setLength(len - 1);
ohair@286:         // whitespaces are already collapsed,
ohair@286:         // so all we have to do is to remove the last one character
ohair@286:         // if it's a whitespace.
ohair@286: 
ohair@286:         return result.toString();
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * No-op.
ohair@286:      *
ohair@286:      * Just return the same string given as the parameter.
ohair@286:      */
ohair@286:     public String marshal(String s) {
ohair@286:         return s;
ohair@286:     }
ohair@286: 
ohair@286: 
ohair@286:     /** returns true if the specified char is a white space character. */
ohair@286:     protected static boolean isWhiteSpace(char ch) {
ohair@286:         // most of the characters are non-control characters.
ohair@286:         // so check that first to quickly return false for most of the cases.
ohair@286:         if( ch>0x20 )   return false;
ohair@286: 
ohair@286:         // other than we have to do four comparisons.
ohair@286:         return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
ohair@286:     }
ohair@286: }