org.apache.commons.collections.functors
public class ConstantTransformer extends Object implements Transformer, Serializable
No check is made that the object is immutable. In general, only immutable objects should use the constant factory. Mutable objects should use the prototype factory.
Since: Commons Collections 3.0
Version: $Revision: 348444 $ $Date: 2005-11-23 14:06:56 +0000 (Wed, 23 Nov 2005) $
Field Summary | |
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static Transformer | NULL_INSTANCE Returns null each time |
Constructor Summary | |
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ConstantTransformer(Object constantToReturn)
Constructor that performs no validation.
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Method Summary | |
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Object | getConstant()
Gets the constant.
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static Transformer | getInstance(Object constantToReturn)
Transformer method that performs validation.
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Object | transform(Object input)
Transforms the input by ignoring it and returning the stored constant instead.
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getInstance
if you want that.
Parameters: constantToReturn the constant to return each time
Returns: the constant
Since: Commons Collections 3.1
Parameters: constantToReturn the constant object to return each time in the factory
Returns: the constant
factory.
Parameters: input the input object which is ignored
Returns: the stored constant