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.form.FormComponentContributorContext;
020    import org.apache.tapestry.form.IFormComponent;
021    import org.apache.tapestry.form.ValidationMessages;
022    import org.apache.tapestry.json.JSONLiteral;
023    import org.apache.tapestry.json.JSONObject;
024    import org.apache.tapestry.valid.ValidationConstants;
025    import org.apache.tapestry.valid.ValidationConstraint;
026    import org.apache.tapestry.valid.ValidationStrings;
027    import org.apache.tapestry.valid.ValidatorException;
028    
029    /**
030     * Validates that the value, a string, is of a minimum length.
031     * 
032     * @author Howard Lewis Ship
033     * @since 4.0
034     */
035    public class MinLength extends BaseValidator
036    {
037        private int _minLength;
038    
039        public MinLength()
040        {
041        }
042    
043        public MinLength(String initializer)
044        {
045            super(initializer);
046        }
047    
048        public void setMinLength(int minLength)
049        {
050            _minLength = minLength;
051        }
052    
053        public int getMinLength()
054        {
055            return _minLength;
056        }
057    
058        public void validate(IFormComponent field, ValidationMessages messages, Object object)
059                throws ValidatorException
060        {
061            String string = (String) object;
062    
063            if (string.length() < _minLength)
064                throw new ValidatorException(buildMessage(messages, field),
065                        ValidationConstraint.MINIMUM_WIDTH);
066        }
067    
068        protected String buildMessage(ValidationMessages messages, IFormComponent field)
069        {
070            return messages.formatValidationMessage(
071                    getMessage(),
072                    ValidationStrings.VALUE_TOO_SHORT,
073                    new Object[]
074                    { new Integer(_minLength), field.getDisplayName() });
075        }
076    
077        public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
078                FormComponentContributorContext context, IFormComponent field)
079        {
080            JSONObject profile = context.getProfile();
081            
082            if (!profile.has(ValidationConstants.CONSTRAINTS)) {
083                profile.put(ValidationConstants.CONSTRAINTS, new JSONObject());
084            }
085            JSONObject cons = profile.getJSONObject(ValidationConstants.CONSTRAINTS);
086            
087            accumulateProperty(cons, field.getClientId(), 
088                    new JSONLiteral("[tapestry.form.validation.isText,{"
089                            + "minlength:" + _minLength + "}]"));
090            
091            accumulateProfileProperty(field, profile, 
092                    ValidationConstants.CONSTRAINTS, buildMessage(context, field));
093        }
094    }