jdplus.toolkit.desktop.plugin.workspace.WorkspaceItemRepositoryLoader Maven / Gradle / Ivy

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package jdplus.toolkit.desktop.plugin.workspace;

import java.lang.Iterable;
import java.util.Optional;
import java.util.ServiceLoader;
import java.util.stream.StreamSupport;

/**
 * Custom service loader for {@link jdplus.toolkit.desktop.plugin.workspace.WorkspaceItemRepository}.
 * 
This class is thread-safe.
 * Properties:
 * 

 * Quantifier: OPTIONAL
 * Fallback: null
 * Preprocessing: null
 * Mutability: NONE
 * Singleton: false
 * Name: null
 * Backend: null
 * Cleaner: null
 * Batch: false
 * Batch name: null
 * 
 */
public final class WorkspaceItemRepositoryLoader {
  private final Iterable source = ServiceLoader.load(WorkspaceItemRepository.class);

  private final Optional resource = doLoad();

  private Optional doLoad() {
    return StreamSupport.stream(source.spliterator(), false)
        .findFirst();
  }

  /**
   * Gets an optional {@link jdplus.toolkit.desktop.plugin.workspace.WorkspaceItemRepository} instance.
   * 
This method is thread-safe.
   * @return the current non-null value
   */
  public Optional get() {
    return resource;
  }

  /**
   * Gets an optional {@link jdplus.toolkit.desktop.plugin.workspace.WorkspaceItemRepository} instance.
   * 
This is equivalent to the following code: new WorkspaceItemRepositoryLoader().get()
   * 
Therefore, the returned value might be different at each call.
   * 
This method is thread-safe.
   * @return a non-null value
   */
  public static Optional load() {
    return new WorkspaceItemRepositoryLoader().get();
  }
}