org.apache.lucene.util

Class SPIClassIterator<S>

java.lang.Object

org.apache.lucene.util.SPIClassIterator<S>

All Implemented Interfaces:

Iterator<Class<? extends S>>

public final class SPIClassIterator<S>
extends Object
implements Iterator<Class<? extends S>>

Helper class for loading SPI classes from classpath (META-INF files). This is a light impl of ServiceLoader but is guaranteed to be bug-free regarding classpath order and does not instantiate or initialize the classes found.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Method Summary

Methods

Modifier and Type	Method and Description
static <S> SPIClassIterator<S>	get(Class<S> clazz)
static <S> SPIClassIterator<S>	get(Class<S> clazz, ClassLoader loader)
boolean	hasNext()
static boolean	isParentClassLoader(ClassLoader parent, ClassLoader child) Utility method to check if some class loader is a (grand-)parent of or the same as another one.
Class<? extends S>	next()
void	remove()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

get

public static <S> SPIClassIterator<S> get(Class<S> clazz)

get

public static <S> SPIClassIterator<S> get(Class<S> clazz,
                          ClassLoader loader)

isParentClassLoader

public static boolean isParentClassLoader(ClassLoader parent,
                          ClassLoader child)

Utility method to check if some class loader is a (grand-)parent of or the same as another one. This means the child will be able to load all classes from the parent, too.

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Class<? extends S>>

next

public Class<? extends S> next()

Specified by:

next in interface Iterator<Class<? extends S>>

remove

public void remove()

Specified by:

remove in interface Iterator<Class<? extends S>>