001    /*
002     * JRecordBind, fixed-length file (un)marshaller
003     * Copyright 2009, Assist s.r.l., and individual contributors as indicated
004     * by the @authors tag. See the copyright.txt in the distribution for a
005     * full listing of individual contributors.
006     *
007     * This is free software; you can redistribute it and/or modify it
008     * under the terms of the GNU Lesser General Public License as
009     * published by the Free Software Foundation; either version 2.1 of
010     * the License, or (at your option) any later version.
011     *
012     * This software is distributed in the hope that it will be useful,
013     * but WITHOUT ANY WARRANTY; without even the implied warranty of
014     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015     * Lesser General Public License for more details.
016     *
017     * You should have received a copy of the GNU Lesser General Public
018     * License along with this software; if not, write to the Free
019     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021     */
022    
023    package it.assist.jrecordbind.util;
024    
025    import java.lang.reflect.Method;
026    
027    /**
028     * Given an object, looks for methods that start with "get" and return a String.
029     * Then it replaces that String, trimmed, by getting and setting it
030     * 
031     * @author Federico Fissore
032     */
033    public class Trimmer {
034    
035      public void trim(Object obj) throws TrimmerException {
036        try {
037          for (Method readMethod : obj.getClass().getMethods()) {
038            String fieldName = null;
039            String readMethodName = readMethod.getName();
040            if (readMethodName.startsWith("is")) {
041              fieldName = readMethodName.substring(2);
042            } else if (readMethodName.startsWith("get")) {
043              fieldName = readMethodName.substring(3);
044            }
045    
046            if (fieldName != null && String.class.isAssignableFrom(readMethod.getReturnType())) {
047              Method writeMethod = obj.getClass().getMethod("set" + fieldName, String.class);
048              if (writeMethod != null) {
049                String value = (String) readMethod.invoke(obj);
050                if (value != null) {
051                  value = value.trim();
052                  writeMethod.invoke(obj, value);
053                }
054              }
055            }
056          }
057        } catch (Exception e) {
058          throw new TrimmerException(e);
059        }
060      }
061    }