001    // Copyright 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.form.validator;
016    
017    import java.util.Date;
018    
019    import org.apache.tapestry.form.IFormComponent;
020    import org.apache.tapestry.form.ValidationMessages;
021    import org.apache.tapestry.valid.ValidationConstraint;
022    import org.apache.tapestry.valid.ValidationStrings;
023    import org.apache.tapestry.valid.ValidatorException;
024    
025    /**
026     * Expects the value to be a {@link Date}, and constrains the date to follow a particular date.
027     * 
028     * @author Howard M. Lewis Ship
029     * @since 4.0
030     */
031    
032    public class MinDate extends BaseValidator
033    {
034        private Date _minDate;
035    
036        public MinDate()
037        {
038        }
039    
040        public MinDate(String initializer)
041        {
042            super(initializer);
043        }
044    
045        public void setMinDate(Date minDate)
046        {
047            _minDate = minDate;
048        }
049    
050        public void validate(IFormComponent field, ValidationMessages messages, Object object)
051                throws ValidatorException
052        {
053            Date date = (Date) object;
054    
055            if (date.before(_minDate))
056                throw new ValidatorException(buildMessage(messages, field),
057                        ValidationConstraint.TOO_SMALL);
058        }
059    
060        private String buildMessage(ValidationMessages messages, IFormComponent field)
061        {
062            return messages.formatValidationMessage(
063                    getMessage(),
064                    ValidationStrings.DATE_TOO_EARLY,
065                    new Object[]
066                    { field.getDisplayName(), _minDate });
067        }
068    
069    }