PrerequisiteChecker (julielab-java-utilities 1.4.2 API)

java.lang.Object
- de.julielab.java.utilities.prerequisites.PrerequisiteChecker

```
public class PrerequisiteChecker
extends Object
```
This is a class meant for chaining together calls like PrerequisiteChecker.checkThat().notNull(ob1, ob2).notEmpty(coll).withNames("ob1", "ob2", "coll").execute(). In case that any of the checks fail on execute(), a message will be recorded for each failed check. Then, an IllegalArgumentException is thrown explaining what went wrong.

Field Summary

Fields
Modifier and Type Field Description

static String PREREQUISITE_CHECKS_ENABLED

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static PrerequisiteChecker`	`checkThat()`
`void`	`execute()`	Checks for null items and, if found, generates an error message.
`PrerequisiteChecker`	`notEmpty(Collection<?>... collections)`
`PrerequisiteChecker`	`notNull(Object... objects)`
`PrerequisiteChecker`	`supplyNotEmpty(Supplier<Collection<?>>... collections)`
`PrerequisiteChecker`	`supplyNotNull(Supplier<?>... objectSuppliers)`
`PrerequisiteChecker`	`withNames(String... names)`	Sets the names for all items previously added to the checker, possibly in multiple calls.

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

- Field Detail
  - PREREQUISITE_CHECKS_ENABLED
```
public static final String PREREQUISITE_CHECKS_ENABLED
```
    See Also:
    
    Constant Field Values
- Method Detail
  - checkThat
```
public static PrerequisiteChecker checkThat()
```
  - withNames
```
public PrerequisiteChecker withNames(String... names)
```
    Sets the names for all items previously added to the checker, possibly in multiple calls. The number of names may lower or even higher than the number of given items. In the first case, the names will be assigned to the checked items from left to right in a continuous manner while the remaining items will receive null as their name. In the second case, all superfluous names will simply be ignored.
    
    Parameters:
    
    names - The names to give to the last list of items to check
    
    Returns:
    
    This object for chaining.
  - notNull
```
public PrerequisiteChecker notNull(Object... objects)
```
  - notEmpty
```
public PrerequisiteChecker notEmpty(Collection<?>... collections)
```
  - supplyNotEmpty
```
public PrerequisiteChecker supplyNotEmpty(Supplier<Collection<?>>... collections)
```
  - supplyNotNull
```
public PrerequisiteChecker supplyNotNull(Supplier<?>... objectSuppliers)
```
  - execute
```
public void execute()
```
    Checks for null items and, if found, generates an error message.