001    /*
002      Copyright (C) 2003 Laurent Martelli <laurent@aopsys.com>
003      
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful, but
010      WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012      Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public
015      License along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
017      USA */
018    
019    package org.objectweb.jac.aspects.gui.web;
020    
021    import java.io.PrintWriter;
022    import java.text.ParsePosition;
023    import org.objectweb.jac.aspects.gui.FloatFormat;
024    import org.objectweb.jac.core.rtti.FieldItem;
025    import org.objectweb.jac.aspects.gui.Format;
026    
027    /**
028     * HTML editor and viewer for percentage values. It can handle short,
029     * int, long, float, and double. In the case of short, int and long,
030     * the percentage value is considered to be between 0 and 100, while
031     * in the case of float and double it must be between 0 and 1.
032     */
033    public abstract class FormatEditor extends AbstractFieldEditor 
034        implements HTMLEditor
035    {
036        public FormatEditor(Object substance, FieldItem field) {
037            super(substance,field);
038            initFormat(field);
039        }
040    
041        /** Stores the default format of the float */
042        protected Format format;
043    
044        protected abstract void initFormat(FieldItem field);
045    
046        public void setField(FieldItem field) {
047            super.setField(field);
048            initFormat(field);
049        }
050    
051        // HTMLEditor interface
052    
053        public void genHTML(PrintWriter out) {
054            out.print("<input type=\"text\" name=\""+label+"\" size=\""+width+"\" style=\"width:"+width+"ex\" "+
055                      "value=\""+(value!=null?(format.format(value)):"")+"\"");
056            printAttributes(out);
057            out.println(">");
058        }
059    
060        protected boolean doReadValue(Object parameter) {
061            if (parameter==null)
062                return false;
063            Object parsedValue = parse((String)parameter);
064            if (parsedValue==null) {
065                return false;
066            } else {
067                setValue(parsedValue);
068                return true;
069            }
070        }
071    
072        protected Object parse(String s) {
073            ParsePosition pos = new ParsePosition(0);
074            return format.parse(s,pos);        
075        }
076    }
077