public class SwitchTransformer extends java.lang.Object implements Transformer, java.io.Serializable
Modifier and Type | Field and Description |
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private Transformer |
iDefault
The default transformer to call if no tests match
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private Predicate[] |
iPredicates
The tests to consider
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private Transformer[] |
iTransformers
The matching transformers to call
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private static long |
serialVersionUID
Serial version UID
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Constructor and Description |
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SwitchTransformer(Predicate[] predicates,
Transformer[] transformers,
Transformer defaultTransformer)
Constructor that performs no validation.
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Modifier and Type | Method and Description |
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Transformer |
getDefaultTransformer()
Gets the default transformer.
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static Transformer |
getInstance(java.util.Map predicatesAndTransformers)
Create a new Transformer that calls one of the transformers depending
on the predicates.
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static Transformer |
getInstance(Predicate[] predicates,
Transformer[] transformers,
Transformer defaultTransformer)
Factory method that performs validation and copies the parameter arrays.
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Predicate[] |
getPredicates()
Gets the predicates, do not modify the array.
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Transformer[] |
getTransformers()
Gets the transformers, do not modify the array.
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java.lang.Object |
transform(java.lang.Object input)
Transforms the input to result by calling the transformer whose matching
predicate returns true.
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private static final long serialVersionUID
private final Predicate[] iPredicates
private final Transformer[] iTransformers
private final Transformer iDefault
public SwitchTransformer(Predicate[] predicates, Transformer[] transformers, Transformer defaultTransformer)
getInstance
if you want that.predicates
- array of predicates, not cloned, no nullstransformers
- matching array of transformers, not cloned, no nullsdefaultTransformer
- the transformer to use if no match, null means return nullpublic static Transformer getInstance(Predicate[] predicates, Transformer[] transformers, Transformer defaultTransformer)
predicates
- array of predicates, cloned, no nullstransformers
- matching array of transformers, cloned, no nullsdefaultTransformer
- the transformer to use if no match, null means return nullchained
transformerjava.lang.IllegalArgumentException
- if array is nulljava.lang.IllegalArgumentException
- if any element in the array is nullpublic static Transformer getInstance(java.util.Map predicatesAndTransformers)
The Map consists of Predicate keys and Transformer values. A transformer is called if its matching predicate returns true. Each predicate is evaluated until one returns true. If no predicates evaluate to true, the default transformer is called. The default transformer is set in the map with a null key. The ordering is that of the iterator() method on the entryset collection of the map.
predicatesAndTransformers
- a map of predicates to transformersswitch
transformerjava.lang.IllegalArgumentException
- if the map is nulljava.lang.IllegalArgumentException
- if any transformer in the map is nulljava.lang.ClassCastException
- if the map elements are of the wrong typepublic java.lang.Object transform(java.lang.Object input)
transform
in interface Transformer
input
- the input object to transformpublic Predicate[] getPredicates()
public Transformer[] getTransformers()
public Transformer getDefaultTransformer()