    001    // Copyright 2007, 2008 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.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.FieldValidator;
    018    import org.apache.tapestry5.MarkupWriter;
    019    import org.apache.tapestry5.ValidationException;
    020
    021    import java.util.List;
    022
    023    /**
    024     * Aggregates together a number of field validator instances as a single unit.
    025     */
    026    public final class CompositeFieldValidator implements FieldValidator
    027    {
    028        private final FieldValidator[] validators;
    029
    030        public CompositeFieldValidator(List<FieldValidator> validators)
    031        {
    032            this.validators = validators.toArray(new FieldValidator[validators.size()]);
    033        }
    034
    035        @SuppressWarnings("unchecked")
    036        public void validate(Object value) throws ValidationException
    037        {
    038            for (FieldValidator fv : validators)
    039                fv.validate(value);
    040        }
    041
    042        public void render(MarkupWriter writer)
    043        {
    044            for (FieldValidator fv : validators)
    045                fv.render(writer);
    046        }
    047
    048        public boolean isRequired()
    049        {
    050            for (FieldValidator fv : validators)
    051            {
    052                if (fv.isRequired()) return true;
    053            }
    054
    055            return false;
    056        }
    057
    058    }