Class ConstantTransformer
- java.lang.Object
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- org.apache.commons.collections.functors.ConstantTransformer
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- All Implemented Interfaces:
java.io.Serializable
,Transformer
public class ConstantTransformer extends java.lang.Object implements Transformer, java.io.Serializable
Transformer implementation that returns the same constant each time.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: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.lang.Object
iConstant
The closures to call in turnstatic Transformer
NULL_INSTANCE
Returns null each timeprivate static long
serialVersionUID
Serial version UID
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Constructor Summary
Constructors Constructor Description ConstantTransformer(java.lang.Object constantToReturn)
Constructor that performs no validation.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
getConstant()
Gets the constant.static Transformer
getInstance(java.lang.Object constantToReturn)
Transformer method that performs validation.java.lang.Object
transform(java.lang.Object input)
Transforms the input by ignoring it and returning the stored constant instead.
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Field Detail
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serialVersionUID
private static final long serialVersionUID
Serial version UID- See Also:
- Constant Field Values
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NULL_INSTANCE
public static final Transformer NULL_INSTANCE
Returns null each time
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iConstant
private final java.lang.Object iConstant
The closures to call in turn
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Method Detail
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getInstance
public static Transformer getInstance(java.lang.Object constantToReturn)
Transformer method that performs validation.- Parameters:
constantToReturn
- the constant object to return each time in the factory- Returns:
- the
constant
factory.
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transform
public java.lang.Object transform(java.lang.Object input)
Transforms the input by ignoring it and returning the stored constant instead.- Specified by:
transform
in interfaceTransformer
- Parameters:
input
- the input object which is ignored- Returns:
- the stored constant
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getConstant
public java.lang.Object getConstant()
Gets the constant.- Returns:
- the constant
- Since:
- Commons Collections 3.1
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