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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.apache.tapestry.ValueEncoder

ValueEncoder
public interface ValueEncoder (Code)
Used by Select (and similar components) to encode server side values into client-side strings, and back.

Most often a custom implementation is needed for entity type objects, where the ValueEncoder.toClient(Object) method extracts a primary key, and the ValueEncoder.toValue(String) re-acquires the corresponding entity object.
See Also:   SelectModel





Method Summary
 StringtoClient(V value)
     Converts a value into a client-side representation.
 VtoValue(String clientValue)
     Converts a client-side representation, provided by ValueEncoder.toClient(Object) , back into a server-side value.



Method Detail
toClient
String toClient(V value)(Code)
Converts a value into a client-side representation. The value should be parseable by ValueEncoder.toValue(String) . In some cases, what is returned is an identifier used to locate the true object, rather than a string representation of the value itself.
Parameters:
  value - to be encoded a string representation of the value, or the value's identity



toValue
V toValue(String clientValue)(Code)
Converts a client-side representation, provided by ValueEncoder.toClient(Object) , back into a server-side value.
Parameters:
  clientValue - string representation of the value's identity the corresponding entity, or null if not found



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