Package org.springframework.core

Class PrioritizedParameterNameDiscoverer

java.lang.Object

org.springframework.core.PrioritizedParameterNameDiscoverer

All Implemented Interfaces:

ParameterNameDiscoverer

Direct Known Subclasses:

DefaultParameterNameDiscoverer

public class PrioritizedParameterNameDiscoverer
extends Object
implements ParameterNameDiscoverer

ParameterNameDiscoverer implementation that tries several discoverer delegates in succession. Those added first in the addDiscoverer method have the highest priority. If one returns null, the next will be tried.

The default behavior is to return null if no discoverer matches.

Since:

2.0

Author:

Rod Johnson, Juergen Hoeller

Constructor Summary

Constructors

Constructor	Description
PrioritizedParameterNameDiscoverer()

Method Summary

Modifier and Type	Method	Description
void	addDiscoverer(ParameterNameDiscoverer pnd)	Add a further ParameterNameDiscoverer delegate to the list of discoverers that this PrioritizedParameterNameDiscoverer checks.
String[]	getParameterNames(Constructor<?> ctor)	Return parameter names for a constructor, or null if they cannot be determined.
String[]	getParameterNames(Method method)	Return parameter names for a method, or null if they cannot be determined.

Methods inherited from class java.lang.Object

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

Constructor Details

PrioritizedParameterNameDiscoverer

public PrioritizedParameterNameDiscoverer()

Method Details

addDiscoverer

public void addDiscoverer(ParameterNameDiscoverer pnd)

Add a further ParameterNameDiscoverer delegate to the list of discoverers that this PrioritizedParameterNameDiscoverer checks.

getParameterNames

@Nullable
public String[] getParameterNames(Method method)

Description copied from interface: ParameterNameDiscoverer

Return parameter names for a method, or null if they cannot be determined.

Individual entries in the array may be null if parameter names are only available for some parameters of the given method but not for others. However, it is recommended to use stub parameter names instead wherever feasible.

Specified by:

getParameterNames in interface ParameterNameDiscoverer

Parameters:

method - the method to find parameter names for

Returns:

an array of parameter names if the names can be resolved, or null if they cannot

getParameterNames

@Nullable
public String[] getParameterNames(Constructor<?> ctor)

Description copied from interface: ParameterNameDiscoverer

Return parameter names for a constructor, or null if they cannot be determined.

Individual entries in the array may be null if parameter names are only available for some parameters of the given constructor but not for others. However, it is recommended to use stub parameter names instead wherever feasible.

Specified by:

getParameterNames in interface ParameterNameDiscoverer

Parameters:

ctor - the constructor to find parameter names for

Returns:

an array of parameter names if the names can be resolved, or null if they cannot