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
015package org.apache.tapestry.form.validator;
016
017import org.apache.tapestry.IMarkupWriter;
018import org.apache.tapestry.IRequestCycle;
019import org.apache.tapestry.TapestryUtils;
020import org.apache.tapestry.form.FormComponentContributorContext;
021import org.apache.tapestry.form.IFormComponent;
022import org.apache.tapestry.form.ValidationMessages;
023import org.apache.tapestry.valid.ValidationConstraint;
024import org.apache.tapestry.valid.ValidationStrings;
025import org.apache.tapestry.valid.ValidatorException;
026
027/**
028 * Validates that the input value is not larger than a particular maximum value.
029 * 
030 * @author Howard Lewis Ship
031 * @since 4.0
032 */
033public class Max extends BaseValidator
034{
035    private double _max;
036
037    public Max()
038    {
039    }
040
041    public Max(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 (value.doubleValue() > _max)
056            throw new ValidatorException(buildMessage(messages, field),
057                    ValidationConstraint.TOO_LARGE);
058    }
059
060    private String buildMessage(ValidationMessages messages, IFormComponent field)
061    {
062        return messages.formatValidationMessage(
063                getMessage(),
064                ValidationStrings.VALUE_TOO_LARGE,
065                new Object[]
066                { field.getDisplayName(), new Double(_max) });
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 = TapestryUtils.enquote(buildMessage(context, field));
075
076        StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_max_number(event, '");
077        buffer.append(field.getClientId());
078        buffer.append("', ");
079        buffer.append(_max);
080        buffer.append(", ");
081        buffer.append(message);
082        buffer.append("); }");
083
084        context.addSubmitHandler(buffer.toString());
085    }
086
087    public void setMax(double max)
088    {
089        _max = max;
090    }
091
092}