Lookup (Jenkins core 2.356 API)

java.lang.Object
- hudson.Lookup

```
public class Lookup
extends Object
```
Type-safe instance map.

Author:

Kohsuke Kawaguchi

Constructor Summary

Constructors
Constructor Description

Lookup()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`<T> T`	`get(Class<T> type)`
`<T> T`	`set(Class<T> type, T instance)`
`<T> T`	`setIfNull(Class<T> type, T instance)`	Overwrites the value only if the current value is null.

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

- Constructor Detail
  - Lookup
```
public Lookup()
```
- Method Detail
  - get
```
public <T> T get(Class<T> type)
```
  - set
```
public <T> T set(Class<T> type,
                 T instance)
```
  - setIfNull
```
public <T> T setIfNull(Class<T> type,
                       T instance)
```
    Overwrites the value only if the current value is null.
    
    Returns:
    
    If the value was null, return the instance value. Otherwise return the current value, which is non-null.