Package org.jdesktop.swingx.util
Class Contract
- java.lang.Object
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- org.jdesktop.swingx.util.Contract
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public class Contract extends java.lang.Object
Utility class for checking contracts.
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Constructor Summary
Constructors Modifier Constructor Description private
Contract()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static <T> T
asNotNull(T input, java.lang.String message)
Tests the input parameter against null.
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Method Detail
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asNotNull
public static <T> T asNotNull(T input, java.lang.String message)
Tests the input parameter against null. If the input is an array, checks all of its elements as well. Returns the unchanged parameter if not null, throws a NullPointerException otherwise.PENDING: type of exception? there are raging debates, some favour an IllegalArgument?
PENDING: the implementation uses a unchecked type cast to an array. can we do better, how?
- Type Parameters:
T
- the type of the input parameter- Parameters:
input
- the argument to check against null.message
- the text of the exception if the argument is null- Returns:
- the input if not null
- Throws:
java.lang.NullPointerException
- if input is null
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