    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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.FieldValidator;
    018import org.apache.tapestry5.MarkupWriter;
    019import org.apache.tapestry5.ValidationException;
    020
    021import java.util.List;
    022
    023/**
    024 * Aggregates together a number of field validator instances as a single unit.
    025 */
    026public 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}