Class ClassLoaders
- java.lang.Object
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- org.apache.commons.discovery.resource.ClassLoaders
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public class ClassLoaders extends java.lang.Object
There are many different contexts in which loaders can be used. This provides a holder for a set of class loaders, so that they don't have to be build back up everytime...- Author:
- Richard A. Sitze, Craig R. McClanahan, Costin Manolache
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Field Summary
Fields Modifier and Type Field Description protected java.util.Vector
classLoaders
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Constructor Summary
Constructors Constructor Description ClassLoaders()
Construct a new class loader set
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.ClassLoader
get(int idx)
static ClassLoaders
getAppLoaders(java.lang.Class spi, java.lang.Class factory, boolean prune)
Utility method.static ClassLoaders
getLibLoaders(java.lang.Class spi, java.lang.Class factory, boolean prune)
Utility method.boolean
isAncestor(java.lang.ClassLoader classLoader)
Check to see ifclassLoader
is an ancestor of any contained class loader.void
put(java.lang.ClassLoader classLoader)
Specify a new class loader to be used in searching.void
put(java.lang.ClassLoader classLoader, boolean prune)
Specify a new class loader to be used in searching.int
size()
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Method Detail
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size
public int size()
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get
public java.lang.ClassLoader get(int idx)
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put
public void put(java.lang.ClassLoader classLoader)
Specify a new class loader to be used in searching. The order of loaders determines the order of the result. It is recommended to add the most specific loaders first.
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put
public void put(java.lang.ClassLoader classLoader, boolean prune)
Specify a new class loader to be used in searching. The order of loaders determines the order of the result. It is recommended to add the most specific loaders first.- Parameters:
prune
- if true, verify that the class loader is not an Ancestor (@see isAncestor) before adding it to our list.
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isAncestor
public boolean isAncestor(java.lang.ClassLoader classLoader)
Check to see ifclassLoader
is an ancestor of any contained class loader. This can be used to eliminate redundant class loaders IF all class loaders defer to parent class loaders before resolving a class. It may be that this is not always true. Therefore, this check is not done internally to eliminate redundant class loaders, but left to the discretion of the user.
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getLibLoaders
public static ClassLoaders getLibLoaders(java.lang.Class spi, java.lang.Class factory, boolean prune)
Utility method. Returns a preloaded ClassLoaders instance containing the following class loaders, in order:- spi.getClassLoader
- seeker.getClassLoader
- System Class Loader
- Parameters:
spi
- WHAT is being looked for (an implementation of this class, a default property file related to this class).factory
- WHO is performing the lookup.prune
- Determines if ancestors are allowed to be loaded or not.
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getAppLoaders
public static ClassLoaders getAppLoaders(java.lang.Class spi, java.lang.Class factory, boolean prune)
Utility method. Returns a preloaded ClassLoaders instance containing the following class loaders, in order:- Thread Context Class Loader
- spi.getClassLoader
- seeker.getClassLoader
- System Class Loader
- Parameters:
spi
- WHAT is being looked for (an implementation of this class, a default property file related to this class).factory
- WHO is performing the lookup (factory).prune
- Determines if ancestors are allowed to be loaded or not.
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