spark.utils

Class ClassUtils

java.lang.Object

spark.utils.ClassUtils

public abstract class ClassUtils
extends Object

Miscellaneous class utility methods. Mainly for internal use within the framework.

Since:

1.1 Code copied from Spring source. Modifications made (mostly removal of methods) by Per Wendel.

Author:

Juergen Hoeller, Keith Donald, Rob Harrop, Sam Brannen

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARRAY_SUFFIX Suffix for array class names: "[]"

Constructor Summary

Constructors

Constructor and Description
ClassUtils()

Method Summary

Modifier and Type	Method and Description
static String	classPackageAsResourcePath(Class<?> clazz) Given an input class object, return a string which consists of the class's package name as a pathname, i.e., all dots ('.') are replaced by slashes ('/').
static Class<?>	forName(String name, ClassLoader classLoader) Replacement for Class.forName() that also returns Class instances for primitives (e.g."int") and array class names (e.g.
static ClassLoader	getDefaultClassLoader() Return the default ClassLoader to use: typically the thread context ClassLoader, if available; the ClassLoader that loaded the ClassUtils class will be used as fallback.
static Class<?>	resolvePrimitiveClassName(String name) Resolve the given class name as primitive class, if appropriate, according to the JVM's naming rules for primitive classes.

Methods inherited from class java.lang.Object

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

Field Detail

ARRAY_SUFFIX

public static final String ARRAY_SUFFIX

Suffix for array class names: "[]"

See Also:

Constant Field Values

Constructor Detail

ClassUtils

public ClassUtils()

Method Detail

getDefaultClassLoader

public static ClassLoader getDefaultClassLoader()

Return the default ClassLoader to use: typically the thread context ClassLoader, if available; the ClassLoader that loaded the ClassUtils class will be used as fallback.

Call this method if you intend to use the thread context ClassLoader in a scenario where you absolutely need a non-null ClassLoader reference: for example, for class path resource loading (but not necessarily for Class.forName, which accepts a null ClassLoader reference as well).

Returns:

the default ClassLoader (never null)

See Also:

Thread.getContextClassLoader()

forName

public static Class<?> forName(String name,
                               ClassLoader classLoader)
                        throws ClassNotFoundException,
                               LinkageError

Replacement for Class.forName() that also returns Class instances for primitives (e.g."int") and array class names (e.g. "String[]"). Furthermore, it is also capable of resolving inner class names in Java source style (e.g. "java.lang.Thread.State" instead of "java.lang.Thread$State").

Parameters:

name - the name of the Class

classLoader - the class loader to use (may be null, which indicates the default class loader)

Returns:

Class instance for the supplied name

Throws:

ClassNotFoundException - if the class was not found

LinkageError - if the class file could not be loaded

See Also:

Class.forName(String, boolean, ClassLoader)

resolvePrimitiveClassName

public static Class<?> resolvePrimitiveClassName(String name)

Resolve the given class name as primitive class, if appropriate, according to the JVM's naming rules for primitive classes.

Also supports the JVM's internal class names for primitive arrays. Does not support the "[]" suffix notation for primitive arrays; this is only supported by forName(String, ClassLoader).

Parameters:

name - the name of the potentially primitive class

Returns:

the primitive class, or null if the name does not denote a primitive class or primitive array class

classPackageAsResourcePath

public static String classPackageAsResourcePath(Class<?> clazz)

Given an input class object, return a string which consists of the class's package name as a pathname, i.e., all dots ('.') are replaced by slashes ('/'). Neither a leading nor trailing slash is added. The result could be concatenated with a slash and the name of a resource and fed directly to ClassLoader.getResource(). For it to be fed to Class.getResource instead, a leading slash would also have to be prepended to the returned value.

Parameters:

clazz - the input class. A null value or the default (empty) package will result in an empty string ("") being returned.

Returns:

a path which represents the package name

See Also:

ClassLoader.getResource(java.lang.String), Class.getResource(java.lang.String)