raimund@1504: package de.intevation.flys.client.client.utils;
raimund@1504: 
raimund@1504: import java.util.Map;
raimund@1504: 
raimund@1507: import com.google.gwt.core.client.GWT;
raimund@1504: import com.google.gwt.i18n.client.NumberFormat;
raimund@1504: 
raimund@1504: import com.smartgwt.client.widgets.form.fields.FormItem;
raimund@1504: 
raimund@1507: import de.intevation.flys.client.client.FLYSConstants;
raimund@1507: 
raimund@1504: /**
raimund@1504:  * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
raimund@1504:  */
raimund@1507: public class DoubleValidator implements Validator {
raimund@1507: 
raimund@1507:     /** The interface that provides i18n messages. */
raimund@1507:     protected FLYSConstants MSG = GWT.create(FLYSConstants.class);
raimund@1504: 
felix@2929: 
felix@2929:     /** Statically determine doubility of String value. */
felix@2929:     public static boolean isDouble(Object obj) {
felix@2929:         if (obj == null) {
felix@2929:             return false;
felix@2929:         }
felix@2929: 
felix@2929:         boolean valid = true;
felix@2929:         String v = obj.toString();
felix@2929: 
felix@2929:         NumberFormat f = NumberFormat.getDecimalFormat();
felix@2929: 
felix@2929:         try {
felix@2929:             if (v == null) {
felix@2929:                 throw new NumberFormatException("empty");
felix@2929:             }
felix@2929: 
felix@2929:             double value = f.parse(v);
felix@2929:         }
felix@2929:         catch (NumberFormatException nfe) {
felix@2929:             valid = false;
felix@2929:         }
felix@2929:         return valid;
sascha@2937: 
felix@2929:     }
felix@2929: 
felix@3351: 
raimund@1504:     /**
felix@3351:      * @return true if items value can be converted to double, if false,
felix@3351:      *         expect error message in \param errors map.
raimund@1504:      */
raimund@1507:     public boolean validate(FormItem item, Map errors) {
raimund@1504:         boolean valid = true;
raimund@1504: 
raimund@1536:         if(item.getValue() == null) {
raimund@1536:             return false;
raimund@1536:         }
raimund@1507:         String v = item.getValue().toString();
raimund@1504: 
raimund@1504:         NumberFormat f = NumberFormat.getDecimalFormat();
raimund@1504: 
raimund@1504:         try {
raimund@1504:             if (v == null) {
raimund@1504:                 throw new NumberFormatException("empty");
raimund@1504:             }
raimund@1504: 
raimund@1504:             double value = f.parse(v);
raimund@1504: 
raimund@1504:             errors.remove(item.getFieldName());
raimund@1504:         }
raimund@1504:         catch (NumberFormatException nfe) {
raimund@1504:             errors.put(item.getFieldName(), MSG.wrongFormat());
raimund@1504: 
raimund@1504:             item.focusInItem();
raimund@1504: 
raimund@1504:             valid = false;
raimund@1504:         }
raimund@1504:         return valid;
raimund@1504:     }
raimund@1504: }
felix@3351: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
raimund@1504: