Class ClassLoaderUtils
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- org.thymeleaf.util.ClassLoaderUtils
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public final class ClassLoaderUtils extends
Utility class for obtaining a correct classloader on which to operate from a specific class.
- Since:
- 2.0.6
- Author:
- Daniel Fernández
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static <?>
className)
Try to obtain a class by name, returningnull
if not found.static
resourceName)
Try to obtain a resource by name, returningnull
if it could not be located.static
resourceName)
Try to obtain a resource by name, returningnull
if it could not be located.static
<?> clazz)
Try to obtain a classloader, following these priorities:static boolean
className)
Checks whether a class is present at the application's class path.static boolean
resourceName)
Checks whether a resource is present at the application's class path.static <?>
className)
Obtain a class by name, throwing an exception if it is not present.static
resourceName)
Obtain a resource by name, throwing an exception if it is not present.
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Method Detail
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getClassLoader
public static getClassLoader(<?> clazz)
Try to obtain a classloader, following these priorities:
- If there is a thread context class loader, return it.
- Else if there is a class loader related to the class passed as argument, return it.
- Else return the system class loader.
- Parameters:
clazz
- the class which loader will be obtained in the second step. Can be null (that will skip that second step).- Returns:
- a non-null, safe classloader to use.
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loadClass
public static <?> loadClass( className) throws
Obtain a class by name, throwing an exception if it is not present.
First the context class loader will be used. If this class loader is not able to load the class, then the class class loader (
ClassLoaderUtils.class.getClassLoader()
) will be used if it is different from the thread context one. Last, the System class loader will be tried.This method does never return
null
.- Parameters:
className
- the name of the class to be obtained.- Returns:
- the loaded class (null never returned).
- Throws:
- if the class could not be loaded.
- Since:
- 3.0.3
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findClass
public static <?> findClass( className)
Try to obtain a class by name, returning
null
if not found.This method works very similarly to
loadClass(String)
but will just returnnull
if the class is not found by the sequence of class loaders being tried.- Parameters:
className
- the name of the class to be obtained.- Returns:
- the found class, or
null
if it could not be found. - Since:
- 3.0.3
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isClassPresent
public static boolean isClassPresent( className)
Checks whether a class is present at the application's class path.
This method works very similarly to
findClass(String)
but will just returntrue
orfalse
depending on whether the class could be found or not.- Parameters:
className
- the name of the class to be checked.- Returns:
true
if the class was found (by any class loader),false
if not.- Since:
- 3.0.3
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findResource
public static findResource( resourceName)
Try to obtain a resource by name, returning
null
if it could not be located.First the context class loader will be used. If this class loader is not able to locate the resource, then the class class loader (
ClassLoaderUtils.class.getClassLoader()
) will be used if it is different from the thread context one. Last, the System class loader will be tried.- Parameters:
resourceName
- the name of the resource to be obtained.- Returns:
- the found resource, or
null
if it could not be located. - Since:
- 3.0.3
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isResourcePresent
public static boolean isResourcePresent( resourceName)
Checks whether a resource is present at the application's class path.
This method works very similarly to
findResource(String)
but will just returntrue
orfalse
depending on whether the resource could be located or not.- Parameters:
resourceName
- the name of the resource to be checked.- Returns:
true
if the class was located (by any class loader),false
if not.- Since:
- 3.0.3
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loadResourceAsStream
public static loadResourceAsStream( resourceName) throws
Obtain a resource by name, throwing an exception if it is not present.
First the context class loader will be used. If this class loader is not able to locate the resource, then the class class loader (
ClassLoaderUtils.class.getClassLoader()
) will be used if it is different from the thread context one. Last, the System class loader will be tried.This method does never return
null
.- Parameters:
resourceName
- the name of the resource to be obtained.- Returns:
- an input stream on the resource (null never returned).
- Throws:
- if the resource could not be located.
- Since:
- 3.0.3
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findResourceAsStream
public static findResourceAsStream( resourceName)
Try to obtain a resource by name, returning
null
if it could not be located.This method works very similarly to
loadResourceAsStream(String)
but will just returnnull
if the resource cannot be located by the sequence of class loaders being tried.- Parameters:
resourceName
- the name of the resource to be obtained.- Returns:
- an input stream on the resource, or
null
if it could not be located. - Since:
- 3.0.3
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