Class SwitchTransformer<T,R> 
java.lang.Object
org.apache.commons.collections4.functors.SwitchTransformer<T,R> 
- Type Parameters:
- T- the type of the input to the function.
- R- the type of the result of the function.
- All Implemented Interfaces:
- Serializable,- Function<T,,- R> - Transformer<T,- R> 
Transformer implementation calls the transformer whose predicate returns true,
 like a switch statement.
- Since:
- 3.0
- See Also:
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Constructor SummaryConstructorsConstructorDescriptionSwitchTransformer(Predicate<? super T>[] predicates, Transformer<? super T, ? extends R>[] transformers, Transformer<? super T, ? extends R> defaultTransformer) Constructor that performs no validation.
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Method SummaryModifier and TypeMethodDescriptionTransformer<? super T, ? extends R> Gets the default transformer.Gets the predicates.Transformer<? super T,? extends R>[] Gets the transformers.static <I,O> Transformer <I, O> switchTransformer(Map<? extends Predicate<? super I>, ? extends Transformer<? super I, ? extends O>> map) Create a new Transformer that calls one of the transformers depending on the predicates.static <I,O> Transformer <I, O> switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I, ? extends O>[] transformers, Transformer<? super I, ? extends O> defaultTransformer) Factory method that performs validation and copies the parameter arrays.Transforms the input to result by calling the transformer whose matching predicate returns true.Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface org.apache.commons.collections4.Transformerapply
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Constructor Details- 
SwitchTransformerpublic SwitchTransformer(Predicate<? super T>[] predicates, Transformer<? super T, ? extends R>[] transformers, Transformer<? super T, ? extends R> defaultTransformer) Constructor that performs no validation. UseswitchTransformerif you want that.- Parameters:
- predicates- array of predicates, cloned, no nulls
- transformers- matching array of transformers, cloned, no nulls
- defaultTransformer- the transformer to use if no match, null means return null
 
 
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Method Details- 
switchTransformerpublic static <I,O> Transformer<I,O> switchTransformer(Map<? extends Predicate<? super I>, ? extends Transformer<? super I, ? extends O>> map) Create a new Transformer that calls one of the transformers depending on the predicates.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. - Type Parameters:
- I- the input type
- O- the output type
- Parameters:
- map- a map of predicates to transformers
- Returns:
- the switchtransformer
- Throws:
- NullPointerException- if the map is null
- NullPointerException- if any transformer in the map is null
- ClassCastException- if the map elements are of the wrong type
 
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switchTransformerpublic static <I,O> Transformer<I,O> switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I, ? extends O>[] transformers, Transformer<? super I, ? extends O> defaultTransformer) Factory method that performs validation and copies the parameter arrays.- Type Parameters:
- I- the input type
- O- the output type
- Parameters:
- predicates- array of predicates, cloned, no nulls
- transformers- matching array of transformers, cloned, no nulls
- defaultTransformer- the transformer to use if no match, null means return null
- Returns:
- the chainedtransformer
- Throws:
- NullPointerException- if either array is null
- NullPointerException- if any element in the arrays is null
- IllegalArgumentException- if the arrays have different sizes
 
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getDefaultTransformerGets the default transformer.- Returns:
- the default transformer
- Since:
- 3.1
 
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getPredicatesGets the predicates.- Returns:
- a copy of the predicates
- Since:
- 3.1
 
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getTransformersGets the transformers.- Returns:
- a copy of the transformers
- Since:
- 3.1
 
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transform
 
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