SPIClassIterator (Lucene 8.5.1 API)

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

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static <S> SPIClassIterator<S>`	`get(Class<S> clazz)`	Creates a new SPI iterator to lookup services of type `clazz` using the same `ClassLoader` as the argument.
`static <S> SPIClassIterator<S>`	`get(Class<S> clazz, ClassLoader loader)`	Creates a new SPI iterator to lookup services of type `clazz` using the given classloader.
`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

Methods inherited from interface java.util.Iterator
forEachRemaining

- Method Detail
  - get
```
public static <S> SPIClassIterator<S> get(Class<S> clazz)
```
    Creates a new SPI iterator to lookup services of type clazz using the same ClassLoader as the argument.
  - get
```
public static <S> SPIClassIterator<S> get(Class<S> clazz,
                                          ClassLoader loader)
```
    Creates a new SPI iterator to lookup services of type clazz using the given classloader.
  - 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.
    If caller's codesource doesn't have enough permissions to do the check, false is returned (this is fine, because if we get a SecurityException it is for sure no parent).
  - hasNext
```
public boolean hasNext()
```
    Specified by:
    
    hasNext in interface Iterator<S>
  - next
```
public Class<? extends S> next()
```
    Specified by:
    
    next in interface Iterator<S>
  - remove
```
public void remove()
```
    Specified by:
    
    remove in interface Iterator<S>