package org.apache.turbine.services.intake.validator;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
   *
   * 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.
   */
  
  import java.text.ParseException;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.turbine.services.intake.IntakeException;
  import org.apache.turbine.services.intake.model.Field;
  import org.apache.turbine.services.intake.model.Group;
  
  /***
   * Validates a DateString field in dependency on another DateString field.
   *
   * <table>
   * <tr>
   *   <th>Name</th><th>Valid Values</th><th>Default Value</th>
   * </tr>
   * <tr>
   *   <td>less-than</td>
   *   <td>&lt;name of other field&gt;</td>
   *   <td>&nbsp;</td>
   * </tr>
   * <tr>
   *   <td>greater-than</td>
   *   <td>&lt;name of other field&gt;</td>
   *   <td>&nbsp;</td>
   * </tr>
   * <tr>
   *   <td>less-than-or-equal</td>
   *   <td>&lt;name of other field&gt;</td>
   *   <td>&nbsp;</td>
   * </tr>
   * <tr>
   *   <td>greater-than-or-equal</td>
   *   <td>&lt;name of other field&gt;</td>
   *   <td>&nbsp;</td>
   * </tr>
   * </table>
   *
   * @author <a href="mailto:tv@apache.org">Thomas Vandahl</a>
   * @version $Id: DateStringValidator.java 534527 2007-05-02 16:10:59Z tv $
   */
  public class DateRangeValidator
          extends DateStringValidator
  {
      /*** List of FieldReferences for multiple comparisons */
      List fieldReferences; 
  
      /*** Callback for the actual compare operation */
      CompareCallback compareCallback; 
  
      public DateRangeValidator(final Map paramMap)
              throws IntakeException
      {
          init(paramMap);
      }
  
      /***
       *  Default constructor
       */
      public DateRangeValidator()
      {
          super();
      }
  
      /***
       * Constructor to use when initialising Object
       *
       * @param paramMap
       * @throws InvalidMaskException
       */
      public void init(final Map paramMap)
              throws InvalidMaskException
      {
          super.init(paramMap);
          
         compareCallback = new CompareCallback()
             {
                 /***
                  * Compare the given values using the compare operation provided
                  * 
                  * @param compare type of compare operation
                  * @param thisValue value of this field
                  * @param refValue value of the reference field
                  * 
                  * @return the result of the comparison
                  */
                 public boolean compareValues(int compare, Object thisValue, Object refValue)
                     throws ClassCastException
                 {
                     boolean result = true;
                     
                     Date thisDate = (Date)thisValue;
                     Date otherDate = (Date)refValue;
                     
                     switch (compare)
                     {
                         case FieldReference.COMPARE_LT:
                             result = thisDate.before(otherDate);
                             break;
                             
                         case FieldReference.COMPARE_LTE:
                             result = !thisDate.after(otherDate);
                             break;
                             
                         case FieldReference.COMPARE_GT:
                             result = thisDate.after(otherDate);
                             break;
                             
                         case FieldReference.COMPARE_GTE:
                             result = !thisDate.before(otherDate);
                             break;
                     }
                     
                     return result;
                 }
             };
         
         fieldReferences = new ArrayList(10);
 
         for (Iterator i = paramMap.entrySet().iterator(); i.hasNext();)
         {
             Map.Entry entry = (Map.Entry)i.next();
             String key = (String)entry.getKey();
             Constraint constraint = (Constraint)entry.getValue();
 
             int compare = FieldReference.getCompareType(key);
             
             if (compare != 0)
             {
                 // found matching constraint
                 FieldReference fieldref = new FieldReference();
                 fieldref.setCompare(compare);
                 fieldref.setFieldName(constraint.getValue());
                 fieldref.setMessage(constraint.getMessage());
                 
                 fieldReferences.add(fieldref);
             }
         }
         
         if (fieldReferences.isEmpty())
         {
             log.warn("No reference field rules have been found.");
         }
     }
     
     /***
      * Determine whether a testValue meets the criteria specified
      * in the constraints defined for this validator
      *
      * @param testField a <code>Field</code> to be tested
      * @exception ValidationException containing an error message if the
      * testValue did not pass the validation tests.
      */
     public void assertValidity(final Field testField)
         throws ValidationException
     {
         super.assertValidity(testField);
         
         Group thisGroup = testField.getGroup();
 
         if (testField.isMultiValued())
         {
             String[] stringValues = (String[])testField.getTestValue();
 
             for (int i = 0; i < stringValues.length; i++)
             {
                 assertValidity(stringValues[i], thisGroup);
             }
         }
         else
         {
             String testValue = (String)testField.getTestValue();
         
             assertValidity(testValue, thisGroup);
         }
     }
 
     /***
      * Determine whether a testValue meets the criteria specified
      * in the constraints defined for this validator
      *
      * @param testValue a <code>String</code> to be tested
      * @param group the group this field belongs to
      * 
      * @exception ValidationException containing an error message if the
      * testValue did not pass the validation tests.
      */
     public void assertValidity(final String testValue, final Group group)
         throws ValidationException
     {
         if (required || StringUtils.isNotEmpty(testValue))
         {
             Date testDate = null;
             
             try
             {
                 testDate = parse(testValue);
             }
             catch (ParseException e)
             {
                 // This should not happen because we succeded with this before, 
                 // but we need to catch the exception anyway
                 errorMessage = getDateFormatMessage();
                 throw new ValidationException(errorMessage);
             }
             
             try
             {
                 FieldReference.checkReferences(fieldReferences, compareCallback, 
                         testDate, group);
             }
             catch (ValidationException e)
             {
                 errorMessage = e.getMessage();
                 throw e;
             }
         }
     }
 }