Introspector (Jadex Active Component Platform 2.5-SNAPSHOT API.)

java.lang.Object
- jadex.commons.beans.Introspector

```
public class Introspector
extends Object
```
The Introspector is a utility for developers to figure out which properties, events, and methods a JavaBean supports.
The Introspector class walks over the class/superclass chain of the target bean class. At each level it checks if there is a matching BeanInfo class which provides explicit information about the bean, and if so uses that explicit information. Otherwise it uses the low level reflection APIs to study the target class and uses design patterns to analyze its behaviour and then proceeds to continue the introspection with its baseclass.

To look for the explicit information of a bean:
1. The Introspector appends "BeanInfo" to the qualified name of the bean class, try to use the new class as the "BeanInfo" class. If the "BeanInfo" class exsits and returns non-null value when queried for explicit information, use the explicit information
2. If the first step fails, the Introspector will extract a simple class name of the bean class by removing the package name from the qualified name of the bean class, append "BeanInfo" to it. And look for the simple class name in the packages defined in the "BeanInfo" search path (The default "BeanInfo" search path is sun.beans.infos). If it finds a "BeanInfo" class and the "BeanInfo" class returns non-null value when queried for explicit information, use the explicit information

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`IGNORE_ALL_BEANINFO` Constant values to indicate that the `Introspector` will ignore all `BeanInfo` class.
`static int`	`IGNORE_IMMEDIATE_BEANINFO` Constant values to indicate that the `Introspector` will ignore the `BeanInfo` class of the current bean class.
`static int`	`USE_ALL_BEANINFO` Constant values to indicate that the `Introspector` will use all `BeanInfo` class which have been found.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String`	`decapitalize(String name)` Decapitalizes a given string according to the rule: If the first or only character is Upper Case, it is made Lower Case UNLESS the second character is also Upper Case, when the String is returned unchanged
`static void`	`flushCaches()` Flushes all `BeanInfo` caches.
`static void`	`flushFromCaches(Class<?> clazz)` Flushes the `BeanInfo` caches of the specified bean class
`static BeanInfo`	`getBeanInfo(Class<?> beanClass)` Gets the `BeanInfo` object which contains the information of the properties, events and methods of the specified bean class.
`static BeanInfo`	`getBeanInfo(Class<?> beanClass, Class<?> stopClass)` Gets the `BeanInfo` object which contains the information of the properties, events and methods of the specified bean class.
`static BeanInfo`	`getBeanInfo(Class<?> beanClass, int flags)` Gets the `BeanInfo` object which contains the information of the properties, events and methods of the specified bean class.
`static String[]`	`getBeanInfoSearchPath()` Gets an array of search packages.
`static void`	`setBeanInfoSearchPath(String[] path)` Sets the search packages.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - IGNORE_ALL_BEANINFO
```
public static final int IGNORE_ALL_BEANINFO
```
    Constant values to indicate that the Introspector will ignore all BeanInfo class.
    
    See Also:
    
    Constant Field Values
  - IGNORE_IMMEDIATE_BEANINFO
```
public static final int IGNORE_IMMEDIATE_BEANINFO
```
    Constant values to indicate that the Introspector will ignore the BeanInfo class of the current bean class.
    
    See Also:
    
    Constant Field Values
  - USE_ALL_BEANINFO
```
public static final int USE_ALL_BEANINFO
```
    Constant values to indicate that the Introspector will use all BeanInfo class which have been found. This is the default one.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - decapitalize
```
public static String decapitalize(String name)
```
    Decapitalizes a given string according to the rule:
    - If the first or only character is Upper Case, it is made Lower Case
    - UNLESS the second character is also Upper Case, when the String is returned unchanged
    Parameters:
    
    name - - the String to decapitalize
    
    Returns:
    
    the decapitalized version of the String
  - flushCaches
```
public static void flushCaches()
```
    Flushes all BeanInfo caches.
  - flushFromCaches
```
public static void flushFromCaches(Class<?> clazz)
```
    Flushes the BeanInfo caches of the specified bean class
    
    Parameters:
    
    clazz - the specified bean class
  - getBeanInfo
```
public static BeanInfo getBeanInfo(Class<?> beanClass)
                            throws IntrospectionException
```
    Gets the BeanInfo object which contains the information of the properties, events and methods of the specified bean class.
    The Introspector will cache the BeanInfo object. Subsequent calls to this method will be answered with the cached data.
    
    Parameters:
    
    beanClass - the specified bean class.
    
    Returns:
    
    the BeanInfo of the bean class.
    
    Throws:
    
    IntrospectionException
  - getBeanInfo
```
public static BeanInfo getBeanInfo(Class<?> beanClass,
                                   Class<?> stopClass)
                            throws IntrospectionException
```
    Gets the BeanInfo object which contains the information of the properties, events and methods of the specified bean class. It will not introspect the "stopclass" and its super class.
    The Introspector will cache the BeanInfo object. Subsequent calls to this method will be answered with the cached data.
    
    Parameters:
    
    beanClass - the specified beanClass.
    
    stopClass - the sopt class which should be super class of the bean class. May be null.
    
    Returns:
    
    the BeanInfo of the bean class.
    
    Throws:
    
    IntrospectionException
  - getBeanInfo
```
public static BeanInfo getBeanInfo(Class<?> beanClass,
                                   int flags)
                            throws IntrospectionException
```
    Gets the BeanInfo object which contains the information of the properties, events and methods of the specified bean class.
    1. If flag==IGNORE_ALL_BEANINFO, the Introspector will ignore all BeanInfo class.
    2. If flag==IGNORE_IMMEDIATE_BEANINFO, the Introspector will ignore the BeanInfo class of the current bean class.
    3. If flag==USE_ALL_BEANINFO, the Introspector will use all BeanInfo class which have been found.
    The Introspector will cache the BeanInfo object. Subsequent calls to this method will be answered with the cached data.
    Parameters:
    
    beanClass - the specified bean class.
    
    flags - the flag to control the usage of the explicit BeanInfo class.
    
    Returns:
    
    the BeanInfo of the bean class.
    
    Throws:
    
    IntrospectionException
  - getBeanInfoSearchPath
```
public static String[] getBeanInfoSearchPath()
```
    Gets an array of search packages.
    
    Returns:
    
    an array of search packages.
  - setBeanInfoSearchPath
```
public static void setBeanInfoSearchPath(String[] path)
```
    Sets the search packages.
    
    Parameters:
    
    path - the new search packages to be set.

Class Introspector

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

IGNORE_ALL_BEANINFO

IGNORE_IMMEDIATE_BEANINFO

USE_ALL_BEANINFO

Method Detail

decapitalize

flushCaches

flushFromCaches

getBeanInfo

getBeanInfo

getBeanInfo

getBeanInfoSearchPath

setBeanInfoSearchPath