001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package javax.xml.bind.annotation.adapters;
018    
019    public final class NormalizedStringAdapter extends XmlAdapter<String, String> {
020    
021        public String marshal(String v) {
022            return v;
023        }
024    
025        public String unmarshal(String v) {
026            if (v == null) {
027                return null;
028            }
029            int i;
030            for (i = v.length() - 1; i >= 0 && !isWhiteSpaceExceptSpace(v.charAt(i)); i--);
031            if (i < 0) {
032                return v;
033            }
034            char buf[] = v.toCharArray();
035            buf[i--] = ' ';
036            for(; i >= 0; i--) {
037                if(isWhiteSpaceExceptSpace(buf[i])) {
038                    buf[i] = ' ';
039                }
040            }
041            return new String(buf);
042        }
043    
044        protected static boolean isWhiteSpaceExceptSpace(char ch) {
045            if (ch >= ' ') {
046                return false;
047            } else {
048                return ch == '\t' || ch == '\n' || ch == '\r';
049            }
050        }
051    
052    }