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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
 //
 //     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.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.

Author(s):
Howard M. Lewis Ship
Since:
4.0
public interface ValueConverter
{
    
Performs a conversion of a value to a particular type.

Parameters:
value The value to be converted (may be null)
desiredType the type that will be converted to
Throws:
org.apache.hivemind.ApplicationRuntimeException if the value can not be converted
Returns:
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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