org.eclipse.aether.util.graph.transformer

## Class ConflictResolver.ScopeSelector

- java.lang.Object
- - org.eclipse.aether.util.graph.transformer.ConflictResolver.ScopeSelector

- Direct Known Subclasses:
    JavaScopeSelector
  Enclosing class:
    ConflictResolver

      public abstract static class ConflictResolver.ScopeSelector
      extends Object

  An extension point of `ConflictResolver` that determines the effective scope of a dependency from a potentially conflicting set of `derived scopes`. The scope selector gets invoked after the `ConflictResolver.VersionSelector` has picked the winning node.

  Note: Implementations must be stateless.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ConflictResolver.ScopeSelector()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `ConflictResolver.ScopeSelector` | `getInstance(DependencyNode root, DependencyGraphTransformationContext context)` Retrieves the scope selector for use during the specified graph transformation.
    `abstract void` | `selectScope(ConflictResolver.ConflictContext context)` Determines the effective scope of the dependency given by `ConflictResolver.ConflictContext.getWinner()`.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### ConflictResolver.ScopeSelector

          public ConflictResolver.ScopeSelector()

  - ### Method Detail

    - #### getInstance

          public ConflictResolver.ScopeSelector getInstance(DependencyNode root,
                                                   DependencyGraphTransformationContext context)
                                                     throws RepositoryException

      Retrieves the scope selector for use during the specified graph transformation. The conflict resolver calls this method once per `ConflictResolver.transformGraph(DependencyNode, DependencyGraphTransformationContext)` invocation to allow implementations to prepare any auxiliary data that is needed for their operation. Given that implementations must be stateless, a new instance needs to be returned to hold such auxiliary data. The default implementation simply returns the current instance which is appropriate for implementations which do not require auxiliary data.
      Parameters:
        `root` - The root node of the (possibly cyclic!) graph to transform, must not be `null`.
        `context` - The graph transformation context, must not be `null`.
      Returns:
        The scope selector to use for the given graph transformation, never `null`.
      Throws:
        `RepositoryException` - If the instance could not be retrieved.

    - #### selectScope

          public abstract void selectScope(ConflictResolver.ConflictContext context)
                                    throws RepositoryException

      Determines the effective scope of the dependency given by `ConflictResolver.ConflictContext.getWinner()`. Implementations will usually iterate `ConflictResolver.ConflictContext.getItems()`, inspect `ConflictResolver.ConflictItem.getScopes()` and eventually call `ConflictResolver.ConflictContext.setScope(String)` to deliver the effective scope.
      Parameters:
        `context` - The conflict context, must not be `null`.
      Throws:
        `RepositoryException` - If the scope selection failed.

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