Package org.apache.lucene.util
Class AttributeFactory
- java.lang.Object
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- org.apache.lucene.util.AttributeFactory
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- Direct Known Subclasses:
AttributeFactory.StaticImplementationAttributeFactory
public abstract class AttributeFactory extends Object
An AttributeFactory creates instances ofAttributeImpls.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static classAttributeFactory.StaticImplementationAttributeFactory<A extends AttributeImpl>Expert: AttributeFactory returning an instance of the givenclazzfor the attributes it implements.
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Field Summary
Fields Modifier and Type Field Description static AttributeFactoryDEFAULT_ATTRIBUTE_FACTORYThis is the default factory that createsAttributeImpls using the class name of the suppliedAttributeinterface class by appendingImplto it.
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Constructor Summary
Constructors Constructor Description AttributeFactory()
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract AttributeImplcreateAttributeInstance(Class<? extends Attribute> attClass)Returns anAttributeImplfor the suppliedAttributeinterface class.static <A extends AttributeImpl>
AttributeFactorygetStaticImplementation(AttributeFactory delegate, Class<A> clazz)Returns an AttributeFactory returning an instance of the givenclazzfor the attributes it implements.
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Field Detail
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DEFAULT_ATTRIBUTE_FACTORY
public static final AttributeFactory DEFAULT_ATTRIBUTE_FACTORY
This is the default factory that createsAttributeImpls using the class name of the suppliedAttributeinterface class by appendingImplto it.
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Method Detail
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createAttributeInstance
public abstract AttributeImpl createAttributeInstance(Class<? extends Attribute> attClass) throws UndeclaredThrowableException
Returns anAttributeImplfor the suppliedAttributeinterface class.- Throws:
UndeclaredThrowableException- A wrapper runtime exception thrown if the constructor of the attribute class throws a checked exception. Note that attributes should not throw or declare checked exceptions; this may be verified and fail early in the future.
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getStaticImplementation
public static <A extends AttributeImpl> AttributeFactory getStaticImplementation(AttributeFactory delegate, Class<A> clazz)
Returns an AttributeFactory returning an instance of the givenclazzfor the attributes it implements. The givenclazzmust have a public no-arg constructor. For all other attributes it calls the given delegate factory as fallback. This method can be used to prefer a specificAttributeImplwhich combines multiple attributes over separate classes.Please save instances created by this method in a static final field, because on each call, this does reflection for creating a
MethodHandle.
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