// Copyright 2004, 2005 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
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to format output (convert object values to strings values) and to process input (convert strings to object values and validate them).
Note that this interface represents validation as supported in Tapestry 2.x to 3.0. It has been
outdated (and will eventually be deprecated) by new support in Tapestry 4.0, centered around the
The input string will already have been trimmed. It may be null.
ValidatorExceptionif the string cannot be converted into an object, or the object is not valid (due to other constraints).