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 value, a string, is of a minimum length.
029 * 
030 * @author Howard Lewis Ship
031 * @since 4.0
032 */
033public class MinLength extends BaseValidator
034{
035    private int _minLength;
036
037    public MinLength()
038    {
039    }
040
041    public MinLength(String initializer)
042    {
043        super(initializer);
044    }
045
046    public void setMinLength(int minLength)
047    {
048        _minLength = minLength;
049    }
050
051    public int getMinLength()
052    {
053        return _minLength;
054    }
055
056    public void validate(IFormComponent field, ValidationMessages messages, Object object)
057            throws ValidatorException
058    {
059        String string = (String) object;
060
061        if (string.length() < _minLength)
062            throw new ValidatorException(buildMessage(messages, field),
063                    ValidationConstraint.MINIMUM_WIDTH);
064    }
065
066    protected String buildMessage(ValidationMessages messages, IFormComponent field)
067    {
068        return messages.formatValidationMessage(
069                getMessage(),
070                ValidationStrings.VALUE_TOO_SHORT,
071                new Object[]
072                { new Integer(_minLength), field.getDisplayName() });
073    }
074
075    public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
076            FormComponentContributorContext context, IFormComponent field)
077    {
078        context.includeClasspathScript("/org/apache/tapestry/form/validator/StringValidator.js");
079
080        StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_min_length(event, '");
081        buffer.append(field.getClientId());
082        buffer.append("', ");
083        buffer.append(_minLength);
084        buffer.append(", ");
085        buffer.append(TapestryUtils.enquote(buildMessage(context, field)));
086        buffer.append("); }");
087
088        context.addSubmitHandler(buffer.toString());
089    }
090}