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 // Copyright 2006, 2007, 2008 The Apache Software Foundation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.validator;
A validator that enforces that the value is not null and not the empty string. This validator is not configurable.
public final class Required extends AbstractValidator<VoidObject>
    public Required()
    {
        super(nullObject.class"required");
    }
    public void validate(Field fieldVoid constraintValueMessageFormatter formatterObject value)
            throws ValidationException
    {
        if (value == null || InternalUtils.isEmptyCollection(value) || InternalUtils.isBlank(value.toString()))
            throw new ValidationException(buildMessage(formatterfield));
    }
    private String buildMessage(MessageFormatter formatterField field)
    {
        return formatter.format(field.getLabel());
    }

    
The exception to the rule.
    public boolean isRequired()
    {
        return true;
    }
    public void render(Field fieldVoid constraintValueMessageFormatter formatterMarkupWriter writer,
                       FormSupport formSupport)
    {
        formSupport.addValidation(field"required"buildMessage(formatterfield), null);
    }
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