Package org.apache.drill.common.scanner

Class ClassPathScanner

java.lang.Object

org.apache.drill.common.scanner.ClassPathScanner

public final class ClassPathScanner
extends Object

Classpath scanning utility. The classpath should be scanned once at startup from a DrillConfig instance. fromPrescan(DrillConfig) The DrillConfig provides: - the list of packages to scan. (drill.classpath.scanning.packages) IMPLEMENTATIONS_SCAN_PACKAGES - the list of base classes to scan for implementations. (drill.classpath.scanning.base.classes) IMPLEMENTATIONS_SCAN_CLASSES - the list of annotations to scan for. (drill.classpath.scanning.annotations) IMPLEMENTATIONS_SCAN_ANNOTATIONS Only the class directories and jars containing a drill-module.conf will be scanned. Drill core packages are scanned at build time and the result is saved in a JSON file. At runtime only the locations that have not been scanned yet will be scanned.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	IMPLEMENTATIONS_SCAN_CACHE	Configuration pathname to turn off build time caching.

Constructor Summary

Constructors

Constructor	Description
ClassPathScanner()

Method Summary

Modifier and Type	Method	Description
static Set<URL>	forResource(String resourcePathname, boolean returnRootPathname)	Gets URLs of any classpath resources with given resource pathname.
static ScanResult	fromPrescan(DrillConfig config)
static Collection<URL>	getConfigURLs(String resourcePathName)

Methods inherited from class java.lang.Object

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

Field Details

IMPLEMENTATIONS_SCAN_CACHE

public static final String IMPLEMENTATIONS_SCAN_CACHE

Configuration pathname to turn off build time caching.

See Also:

• Constant Field Values

Constructor Details

ClassPathScanner

public ClassPathScanner()

Method Details

getConfigURLs

public static Collection<URL> getConfigURLs(String resourcePathName)

forResource

public static Set<URL> forResource(String resourcePathname,
 boolean returnRootPathname)

Gets URLs of any classpath resources with given resource pathname.

Parameters:

resourcePathname - resource pathname of classpath resource instances to scan for (relative to specified class loaders' classpath roots)

returnRootPathname - whether to collect classpath root portion of URL for each resource instead of full URL of each resource

Returns:

empty set if none

fromPrescan

public static ScanResult fromPrescan(DrillConfig config)