/*

  * Copyright 2006-2008 The Kuali Foundation

  * 

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  * http://www.opensource.org/licenses/ecl2.php

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.core.web.format;

 import java.util.Arrays;

 import java.util.List;

 import org.kuali.rice.core.util.RiceKeyConstants;

 /**

  * This class is a formatter for little-b boolean classes, that cannot accept a null.

  */

 public class LittleBooleanFormatter extends Formatter {

     static final List TRUE_VALUES = Arrays.asList(new String[] { "yes", "y", "true", "t", "on", "1", "enabled" });

     static final List FALSE_VALUES = Arrays.asList(new String[] { "no", "n", "false", "f", "off", "0", "disabled" });

     protected Object convertToObject(String target) {

         if (Formatter.isEmptyValue(target))

             return Boolean.FALSE;

         String stringValue = target.getClass().isArray() ? unwrapString(target) : (String) target;

         stringValue = stringValue.trim().toLowerCase();

         if (TRUE_VALUES.contains(stringValue))

             return Boolean.TRUE;

         if (FALSE_VALUES.contains(stringValue))

             return Boolean.FALSE;

         throw new FormatException("converting", RiceKeyConstants.ERROR_BOOLEAN, stringValue);

     }

     public Object format(Object target) {

         if (target == null)

             return "No";

         if (target instanceof String) {

             return target;

         }

         boolean isTrue = ((Boolean) target).booleanValue();

         return isTrue ? "Yes" : "No";

     }

     protected Object getNullObjectValue() {

         return Boolean.FALSE;

     }

 }