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.hivemind.util.PropertyUtils;
018    import org.apache.tapestry.IMarkupWriter;
019    import org.apache.tapestry.IRequestCycle;
020    import org.apache.tapestry.form.FormComponentContributorContext;
021    import org.apache.tapestry.form.IFormComponent;
022    
023    /**
024     * Abstract implementation of {@link org.apache.tapestry.form.validator.Validator}.
025     * 
026     * @author Howard Lewis Ship
027     * @since 4.0
028     */
029    
030    public abstract class BaseValidator implements Validator
031    {
032        private String _message;
033    
034        public String getMessage()
035        {
036            return _message;
037        }
038    
039        public void setMessage(String message)
040        {
041            _message = message;
042        }
043    
044        public BaseValidator()
045        {
046        }
047    
048        public BaseValidator(String initializer)
049        {
050            PropertyUtils.configureProperties(this, initializer);
051        }
052    
053        /**
054         * Returns false.
055         */
056    
057        public boolean getAcceptsNull()
058        {
059            return false;
060        }
061    
062        /**
063         * Does nothing.
064         */
065    
066        public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
067                FormComponentContributorContext context, IFormComponent field)
068        {
069        }
070    
071        /**
072         * Returns false. Subclasses may override.
073         */
074    
075        public boolean isRequired()
076        {
077            return false;
078        }
079    }