com.taobao.android.dexposed

类 ClassUtils

java.lang.Object

com.taobao.android.dexposed.ClassUtils

public class ClassUtils
extends java.lang.Object

Operates on classes without using reflection.

This class handles invalid null inputs as best it can. Each method documents its behaviour in more detail.

The notion of a canonical name includes the human readable name for the type, for example int[]. The non-canonical method variants work with the JVM names, such as [I.

从以下版本开始:

2.0

字段概要

字段

限定符和类型	字段和说明
static java.lang.String	INNER_CLASS_SEPARATOR The inner class separator String: "$".
static char	INNER_CLASS_SEPARATOR_CHAR The inner class separator character: '$' == 36.
static java.lang.String	PACKAGE_SEPARATOR The package separator String: ".".
static char	PACKAGE_SEPARATOR_CHAR The package separator character: '.' == 46.
static java.lang.String	STRING_EMPTY Empty string.

构造器概要

构造器

构造器和说明
ClassUtils() ClassUtils instances should NOT be constructed in standard programming.

方法概要

方法

限定符和类型	方法和说明
static java.util.List<java.lang.String>	convertClassesToClassNames(java.util.List<java.lang.Class<?>> classes) Given a List of Class objects, this method converts them into class names.
static java.util.List<java.lang.Class<?>>	convertClassNamesToClasses(java.util.List<java.lang.String> classNames) Given a List of class names, this method converts them into classes.
static java.lang.String	deleteWhitespace(java.lang.String str) Deletes all whitespaces from a String as defined by Character.isWhitespace(char).
static java.util.List<java.lang.Class<?>>	getAllInterfaces(java.lang.Class<?> cls) Gets a List of all interfaces implemented by the given class and its superclasses.
static java.util.List<java.lang.Class<?>>	getAllSuperclasses(java.lang.Class<?> cls) Gets a List of superclasses for the given class.
static java.lang.Class<?>	getClass(java.lang.ClassLoader classLoader, java.lang.String className) Returns the (initialized) class represented by className using the classLoader.
static java.lang.Class<?>	getClass(java.lang.ClassLoader classLoader, java.lang.String className, boolean initialize) Returns the class represented by className using the classLoader.
static java.lang.Class<?>	getClass(java.lang.String className) Returns the (initialized) class represented by className using the current thread's context class loader.
static java.lang.Class<?>	getClass(java.lang.String className, boolean initialize) Returns the class represented by className using the current thread's context class loader.
static java.lang.String	getPackageName(java.lang.Class<?> cls) Gets the package name of a Class.
static java.lang.String	getPackageName(java.lang.Object object, java.lang.String valueIfNull) Gets the package name of an Object.
static java.lang.String	getPackageName(java.lang.String className) Gets the package name from a String.
static java.lang.String	getShortClassName(java.lang.Class<?> cls) Gets the class name minus the package name from a Class.
static java.lang.String	getShortClassName(java.lang.Object object, java.lang.String valueIfNull) Gets the class name minus the package name for an Object.
static java.lang.String	getShortClassName(java.lang.String className) Gets the class name minus the package name from a String.
static java.lang.String	getSimpleName(java.lang.Class<?> cls) Null-safe version of aClass.getSimpleName()
static java.lang.String	getSimpleName(java.lang.Object object, java.lang.String valueIfNull) Null-safe version of aClass.getSimpleName()
static boolean	isEmpty(java.lang.CharSequence cs) Checks if a CharSequence is empty ("") or null.
static java.lang.Class<?>[]	toClass(java.lang.Object... array) Converts an array of Object in to an array of Class objects.

从类继承的方法 java.lang.Object

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

字段详细资料

PACKAGE_SEPARATOR_CHAR

public static final char PACKAGE_SEPARATOR_CHAR

The package separator character: '.' == 46.

另请参阅:

常量字段值

PACKAGE_SEPARATOR

public static final java.lang.String PACKAGE_SEPARATOR

The package separator String: ".".

INNER_CLASS_SEPARATOR_CHAR

public static final char INNER_CLASS_SEPARATOR_CHAR

The inner class separator character: '$' == 36.

另请参阅:

常量字段值

INNER_CLASS_SEPARATOR

public static final java.lang.String INNER_CLASS_SEPARATOR

The inner class separator String: "$".

STRING_EMPTY

public static final java.lang.String STRING_EMPTY

Empty string.

另请参阅:

常量字段值

构造器详细资料

ClassUtils

public ClassUtils()

ClassUtils instances should NOT be constructed in standard programming. Instead, the class should be used as ClassUtils.getShortClassName(cls).

This constructor is public to permit tools that require a JavaBean instance to operate.

方法详细资料

getShortClassName

public static java.lang.String getShortClassName(java.lang.Object object,
                                 java.lang.String valueIfNull)

Gets the class name minus the package name for an Object.

参数:

object - the class to get the short name for, may be null

valueIfNull - the value to return if null

返回:

the class name of the object without the package name, or the null value

getShortClassName

public static java.lang.String getShortClassName(java.lang.Class<?> cls)

Gets the class name minus the package name from a Class.

Consider using the Java 5 API Class.getSimpleName() instead. The one known difference is that this code will return "Map.Entry" while the java.lang.Class variant will simply return "Entry".

参数:

cls - the class to get the short name for.

返回:

the class name without the package name or an empty string

getShortClassName

public static java.lang.String getShortClassName(java.lang.String className)

Gets the class name minus the package name from a String.

The string passed in is assumed to be a class name - it is not checked.

Note that this method differs from Class.getSimpleName() in that this will return "Map.Entry" whilst the java.lang.Class variant will simply return "Entry".

参数:

className - the className to get the short name for

返回:

the class name of the class without the package name or an empty string

getSimpleName

public static java.lang.String getSimpleName(java.lang.Class<?> cls)

Null-safe version of aClass.getSimpleName()

参数:

cls - the class for which to get the simple name.

返回:

the simple class name.

从以下版本开始:

3.0

另请参阅:

Class.getSimpleName()

getSimpleName

public static java.lang.String getSimpleName(java.lang.Object object,
                             java.lang.String valueIfNull)

Null-safe version of aClass.getSimpleName()

参数:

object - the object for which to get the simple class name.

valueIfNull - the value to return if object is null

返回:

the simple class name.

从以下版本开始:

3.0

另请参阅:

Class.getSimpleName()

getPackageName

public static java.lang.String getPackageName(java.lang.Object object,
                              java.lang.String valueIfNull)

Gets the package name of an Object.

参数:

object - the class to get the package name for, may be null

valueIfNull - the value to return if null

返回:

the package name of the object, or the null value

getPackageName

public static java.lang.String getPackageName(java.lang.Class<?> cls)

Gets the package name of a Class.

参数:

cls - the class to get the package name for, may be null.

返回:

the package name or an empty string

getPackageName

public static java.lang.String getPackageName(java.lang.String className)

Gets the package name from a String.

The string passed in is assumed to be a class name - it is not checked.

If the class is unpackaged, return an empty string.

参数:

className - the className to get the package name for, may be null

返回:

the package name or an empty string

getAllSuperclasses

public static java.util.List<java.lang.Class<?>> getAllSuperclasses(java.lang.Class<?> cls)

Gets a List of superclasses for the given class.

参数:

cls - the class to look up, may be null

返回:

the List of superclasses in order going up from this one null if null input

getAllInterfaces

public static java.util.List<java.lang.Class<?>> getAllInterfaces(java.lang.Class<?> cls)

Gets a List of all interfaces implemented by the given class and its superclasses.

The order is determined by looking through each interface in turn as declared in the source file and following its hierarchy up. Then each superclass is considered in the same way. Later duplicates are ignored, so the order is maintained.

参数:

cls - the class to look up, may be null

返回:

the List of interfaces in order, null if null input

convertClassNamesToClasses

public static java.util.List<java.lang.Class<?>> convertClassNamesToClasses(java.util.List<java.lang.String> classNames)

Given a List of class names, this method converts them into classes.

A new List is returned. If the class name cannot be found, null is stored in the List. If the class name in the List is null, null is stored in the output List.

参数:

classNames - the classNames to change

返回:

a List of Class objects corresponding to the class names, null if null input

抛出:

java.lang.ClassCastException - if classNames contains a non String entry

convertClassesToClassNames

public static java.util.List<java.lang.String> convertClassesToClassNames(java.util.List<java.lang.Class<?>> classes)

Given a List of Class objects, this method converts them into class names.

A new List is returned. null objects will be copied into the returned list as null.

参数:

classes - the classes to change

返回:

a List of class names corresponding to the Class objects, null if null input

抛出:

java.lang.ClassCastException - if classes contains a non-Class entry

getClass

public static java.lang.Class<?> getClass(java.lang.ClassLoader classLoader,
                          java.lang.String className,
                          boolean initialize)
                                   throws java.lang.ClassNotFoundException

Returns the class represented by className using the classLoader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".

参数:

classLoader - the class loader to use to load the class

className - the class name

initialize - whether the class must be initialized

返回:

the class represented by className using the classLoader

抛出:

java.lang.ClassNotFoundException - if the class is not found

getClass

public static java.lang.Class<?> getClass(java.lang.ClassLoader classLoader,
                          java.lang.String className)
                                   throws java.lang.ClassNotFoundException

Returns the (initialized) class represented by className using the classLoader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".

参数:

classLoader - the class loader to use to load the class

className - the class name

返回:

the class represented by className using the classLoader

抛出:

java.lang.ClassNotFoundException - if the class is not found

getClass

public static java.lang.Class<?> getClass(java.lang.String className)
                                   throws java.lang.ClassNotFoundException

Returns the (initialized) class represented by className using the current thread's context class loader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".

参数:

className - the class name

返回:

the class represented by className using the current thread's context class loader

抛出:

java.lang.ClassNotFoundException - if the class is not found

getClass

public static java.lang.Class<?> getClass(java.lang.String className,
                          boolean initialize)
                                   throws java.lang.ClassNotFoundException

Returns the class represented by className using the current thread's context class loader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".

参数:

className - the class name

initialize - whether the class must be initialized

返回:

the class represented by className using the current thread's context class loader

抛出:

java.lang.ClassNotFoundException - if the class is not found

toClass

public static java.lang.Class<?>[] toClass(java.lang.Object... array)

Converts an array of Object in to an array of Class objects. If any of these objects is null, a null element will be inserted into the array.

This method returns null for a null input array.

参数:

array - an Object array

返回:

a Class array, null if null array input

从以下版本开始:

2.4

deleteWhitespace

public static java.lang.String deleteWhitespace(java.lang.String str)

Deletes all whitespaces from a String as defined by Character.isWhitespace(char).

 StringUtils.deleteWhitespace(null)         = null
 StringUtils.deleteWhitespace("")           = ""
 StringUtils.deleteWhitespace("abc")        = "abc"
 StringUtils.deleteWhitespace("   ab  c  ") = "abc"
 

参数:

str - the String to delete whitespace from, may be null

返回:

the String without whitespaces, null if null String input

isEmpty

public static boolean isEmpty(java.lang.CharSequence cs)

Checks if a CharSequence is empty ("") or null.

 StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true
 StringUtils.isEmpty(" ")       = false
 StringUtils.isEmpty("bob")     = false
 StringUtils.isEmpty("  bob  ") = false
 

NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is available in isBlank().

参数:

cs - the CharSequence to check, may be null

返回:

true if the CharSequence is empty or null

从以下版本开始:

3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)