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 org.apache.tapestry.IMarkupWriter;
018    import org.apache.tapestry.IRequestCycle;
019    import org.apache.tapestry.TapestryUtils;
020    import org.apache.tapestry.form.FormComponentContributorContext;
021    import org.apache.tapestry.form.IFormComponent;
022    import org.apache.tapestry.form.ValidationMessages;
023    import org.apache.tapestry.valid.ValidationConstraint;
024    import org.apache.tapestry.valid.ValidationStrings;
025    import org.apache.tapestry.valid.ValidatorException;
026    
027    /**
028     * Expects the object to be a number, and checks that the value not smaller than a specified value.
029     * 
030     * @author Howard Lewis Ship
031     * @since 4.0
032     */
033    public class Min extends BaseValidator
034    {
035        private double _min;
036    
037        public Min()
038        {
039        }
040    
041        public Min(String initializer)
042        {
043            super(initializer);
044        }
045    
046        /**
047         * Does comparison based on the {@link Number#doubleValue()}.
048         */
049    
050        public void validate(IFormComponent field, ValidationMessages messages, Object object)
051                throws ValidatorException
052        {
053            Number value = (Number) object;
054    
055            if (_min > value.doubleValue())
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.VALUE_TOO_SMALL,
065                    new Object[]
066                    { field.getDisplayName(), new Double(_min) });
067        }
068    
069        public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
070                FormComponentContributorContext context, IFormComponent field)
071        {
072            context.includeClasspathScript("/org/apache/tapestry/form/validator/NumberValidator.js");
073    
074            String message = buildMessage(context, field);
075    
076            StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_min_number(event, '");
077            buffer.append(field.getClientId());
078            buffer.append("', ");
079            buffer.append(_min);
080            buffer.append(", ");
081            buffer.append(TapestryUtils.enquote(message));
082            buffer.append("); }");
083    
084            context.addSubmitHandler(buffer.toString());
085        }
086    
087        public void setMin(double min)
088        {
089            _min = min;
090        }
091    
092    }