picard.cmdline

Class ClassFinder

java.lang.Object

picard.cmdline.ClassFinder

public class ClassFinder
extends java.lang.Object

Utility class that can scan for classes in the classpath and find all the ones annotated with a particular annotation.

Author:

Tim Fennell

Constructor Summary

Constructors

Constructor and Description
ClassFinder()
ClassFinder(java.lang.ClassLoader loader)
ClassFinder(java.io.File jarFile)

Method Summary

Modifier and Type	Method and Description
void	find(java.lang.String packageName, java.lang.Class<?> parentType) Scans the classpath for classes within the specified package and sub-packages that extend the parentType.
java.util.Set<java.lang.Class<?>>	getClasses() Fetches the set of classes discovered so far.
protected void	handleItem(java.lang.String name) Checks an item to see if it is a class and is annotated with the specified annotation.
protected void	scanDir(java.io.File file, java.lang.String path) Scans a directory on the filesystem for classes.
protected void	scanJar(java.io.File file, java.lang.String packagePath) Scans the entries in a ZIP/JAR file for classes under the parent package.
java.lang.String	toClassName(java.lang.String filename) Convert a filename to a class name by removing '.class' and converting '/'s to '.'s.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassFinder

public ClassFinder()

ClassFinder

public ClassFinder(java.lang.ClassLoader loader)

ClassFinder

public ClassFinder(java.io.File jarFile)
            throws java.io.IOException

Throws:

java.io.IOException

Method Detail

toClassName

public java.lang.String toClassName(java.lang.String filename)

Convert a filename to a class name by removing '.class' and converting '/'s to '.'s.

find

public void find(java.lang.String packageName,
                 java.lang.Class<?> parentType)

Scans the classpath for classes within the specified package and sub-packages that extend the parentType. This method can be called repeatedly with different packages. Classes are accumulated internally and can be accessed by calling getClasses().

scanJar

protected void scanJar(java.io.File file,
                       java.lang.String packagePath)
                throws java.io.IOException

Scans the entries in a ZIP/JAR file for classes under the parent package.

Parameters:

file - the jar file to be scanned

packagePath - the top level package to start from

Throws:

java.io.IOException

scanDir

protected void scanDir(java.io.File file,
                       java.lang.String path)

Scans a directory on the filesystem for classes.

Parameters:

file - the directory or file to examine

path - the package path acculmulated so far (e.g. edu/mit/broad)

handleItem

protected void handleItem(java.lang.String name)

Checks an item to see if it is a class and is annotated with the specified annotation. If so, adds it to the set, otherwise ignores it.

Parameters:

name - the path equivelant to the package + class/item name

getClasses

public java.util.Set<java.lang.Class<?>> getClasses()

Fetches the set of classes discovered so far.