Package org.eclipse.aether.util.graph.manager

Class NoopDependencyManager

java.lang.Object
org.eclipse.aether.util.graph.manager.NoopDependencyManager
All Implemented Interfaces:
org.eclipse.aether.collection.DependencyManager
public final class NoopDependencyManager extends Object implements org.eclipse.aether.collection.DependencyManager
A dependency manager that performs no dependency management operations.

Overview

This is a null-object implementation of DependencyManager that effectively disables all dependency management. It always returns null for management operations and returns itself for child manager derivation, making it a true no-op implementation.

When to Use

  • Testing: When you want to disable dependency management for tests
  • Simple Resolution: When you want pure dependency resolution without management
  • Performance: When dependency management overhead is not needed
  • Legacy Systems: When working with systems that handle management externally

Thread Safety

This implementation is completely thread-safe and stateless. The INSTANCE can be safely shared across multiple threads and throughout the entire application lifecycle.

Comparison with Other Managers

See Also:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final org.eclipse.aether.collection.DependencyManager
    INSTANCE
    A ready-made singleton instance of this dependency manager.

  • Constructor Summary

    Constructors
    Constructor
    Description
    NoopDependencyManager()
    Creates a new instance of this dependency manager.

  • Method Summary

    Modifier and Type
    Method
    Description
    org.eclipse.aether.collection.DependencyManager
    deriveChildManager(org.eclipse.aether.collection.DependencyCollectionContext context)
    Returns this same instance as the child manager (no-op behavior).
    boolean
    equals(Object obj)
     
    int
    hashCode()
     
    org.eclipse.aether.collection.DependencyManagement
    manageDependency(org.eclipse.aether.graph.Dependency dependency)
    Returns null, indicating no dependency management should be applied.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • INSTANCE

      public static final org.eclipse.aether.collection.DependencyManager INSTANCE
      A ready-made singleton instance of this dependency manager.

      This instance can be safely reused throughout an entire application regardless of multi-threading, as this implementation is completely stateless and thread-safe. Using this instance is preferred over creating new instances for performance reasons.

  • Constructor Details

    • NoopDependencyManager

      public NoopDependencyManager()
      Creates a new instance of this dependency manager.

      Note: Usually, INSTANCE should be used instead of creating new instances, as this implementation is stateless and the singleton provides better performance characteristics.

  • Method Details

    • deriveChildManager

      public org.eclipse.aether.collection.DependencyManager deriveChildManager(org.eclipse.aether.collection.DependencyCollectionContext context)
      Returns this same instance as the child manager (no-op behavior).
      Specified by:
      deriveChildManager in interface org.eclipse.aether.collection.DependencyManager
      Parameters:
      context - the dependency collection context (validated but not used)
      Returns:
      this same instance
      Throws:
      NullPointerException - if context is null

    • manageDependency

      public org.eclipse.aether.collection.DependencyManagement manageDependency(org.eclipse.aether.graph.Dependency dependency)
      Returns null, indicating no dependency management should be applied.
      Specified by:
      manageDependency in interface org.eclipse.aether.collection.DependencyManager
      Parameters:
      dependency - the dependency to manage (validated but not used)
      Returns:
      null (no management)
      Throws:
      NullPointerException - if dependency is null

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object