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.valid.ValidatorException;
023    
024    /**
025     * Abstract implementation of {@link org.apache.tapestry.form.validator.Validator} that delegates to
026     * some other object.
027     * 
028     * @author Howard Lewis Ship
029     * @since 4.0
030     */
031    public abstract class AbstractValidatorWrapper implements Validator
032    {
033        protected abstract Validator getDelegate();
034    
035        public void validate(IFormComponent field, ValidationMessages messages, Object object)
036                throws ValidatorException
037        {
038            getDelegate().validate(field, messages, object);
039        }
040    
041        public boolean getAcceptsNull()
042        {
043            return getDelegate().getAcceptsNull();
044        }
045    
046        public boolean isRequired()
047        {
048            return getDelegate().isRequired();
049        }
050    
051        public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
052                FormComponentContributorContext context, IFormComponent field)
053        {
054            getDelegate().renderContribution(writer, cycle, context, field);
055        }
056    
057    }