ExpressionCombiner (Knopflerfish OSGi 6.1.3 javadoc)

```
@ProviderType
public interface ExpressionCombiner
```
An ExpressionCombiner can be used to combine requirement expressions into a single complex requirement expression using the and, or and not operators.

Since:

1.1

ThreadSafe

Method Summary

Methods
Modifier and Type	Method and Description
`AndExpression`	`and(RequirementExpression expr1, RequirementExpression expr2)` Combine two `RequirementExpression`s into a requirement expression using the `and` operator.
`AndExpression`	`and(RequirementExpression expr1, RequirementExpression expr2, RequirementExpression... moreExprs)` Combine multiple `RequirementExpression`s into a requirement expression using the `and` operator.
`IdentityExpression`	`identity(Requirement req)` Wrap a `Requirement` in an `IdentityExpression`.
`NotExpression`	`not(RequirementExpression expr)` Return the negation of a `RequirementExpression`.
`OrExpression`	`or(RequirementExpression expr1, RequirementExpression expr2)` Combine two `RequirementExpression`s into a requirement expression using the `or` operator.
`OrExpression`	`or(RequirementExpression expr1, RequirementExpression expr2, RequirementExpression... moreExprs)` Combine multiple `RequirementExpression`s into a requirement expression using the `or` operator.

- Method Detail
  - and
```
AndExpression and(RequirementExpression expr1,
                RequirementExpression expr2)
```
    Combine two RequirementExpressions into a requirement expression using the and operator.
    
    Parameters:
    expr1 - The first requirement expression to combine into the returned requirement expression.
    expr2 - The second requirement expression to combine into the returned requirement expression
    
    Returns:
    An AndExpression representing an and of the specified requirement expressions.
  - and
```
AndExpression and(RequirementExpression expr1,
                RequirementExpression expr2,
                RequirementExpression... moreExprs)
```
    Combine multiple RequirementExpressions into a requirement expression using the and operator.
    
    Parameters:
    expr1 - The first requirement expression to combine into the returned requirement expression.
    expr2 - The second requirement expression to combine into the returned requirement expression
    moreExprs - Optional, additional requirement expressions to combine into the returned requirement expression.
    
    Returns:
    An AndExpression representing an and of the specified requirement expressions.
  - identity
```
IdentityExpression identity(Requirement req)
```
    Wrap a Requirement in an IdentityExpression. This can be useful when working with a combination of Requirements and RequirementExpresions.
    
    Parameters:
    req - The requirement to wrap in a requirement expression.
    
    Returns:
    An IdentityExpression representing the specified requirement.
  - not
```
NotExpression not(RequirementExpression expr)
```
    Return the negation of a RequirementExpression.
    
    Parameters:
    expr - The requirement expression to negate.
    
    Returns:
    A NotExpression representing the not of the specified requirement expression.
  - or
```
OrExpression or(RequirementExpression expr1,
              RequirementExpression expr2)
```
    Combine two RequirementExpressions into a requirement expression using the or operator.
    
    Parameters:
    expr1 - The first requirement expression to combine into the returned requirement expression.
    expr2 - The second requirement expression to combine into the returned requirement expression
    
    Returns:
    An OrExpression representing an or of the specified requirement expressions.
  - or
```
OrExpression or(RequirementExpression expr1,
              RequirementExpression expr2,
              RequirementExpression... moreExprs)
```
    Combine multiple RequirementExpressions into a requirement expression using the or operator.
    
    Parameters:
    expr1 - The first requirement expression to combine into the returned requirement expression.
    expr2 - The second requirement expression to combine into the returned requirement expression
    moreExprs - Optional, additional requirement expressions to combine into the returned requirement expression.
    
    Returns:
    An OrExpression representing an or of the specified requirement expressions.

Interface ExpressionCombiner

Method Summary

Method Detail

and

and

identity

not

or

or