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 // 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.coerce;

Converts a value (possibly null) to an alternate data type; typically from String to boolean or a number type.

Typically, a ValueConverter will select a particular TypeConverterto perform the conversion. The ValueConverterImplimplementation also makes use of built-in java.beans.PropertyEditors.

Howard M. Lewis Ship
public interface ValueConverter
Performs a conversion of a value to a particular type.

value The value to be converted (may be null)
desiredType the type that will be converted to
org.apache.hivemind.ApplicationRuntimeException if the value can not be converted
the value converted to the indicated type. May return the input value if it is already assignable to the desiredType.
    Object coerceValue(Object valueClass desiredType);
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