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  package org.apache.cayenne.access;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.cayenne.Cayenne;
  import org.apache.cayenne.PersistenceState;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.map.DeleteRule;
  import org.apache.cayenne.map.ObjRelationship;
  import org.apache.cayenne.query.ObjectSelect;
  import org.apache.cayenne.test.jdbc.DBHelper;
  import org.apache.cayenne.test.jdbc.TableHelper;
  import org.apache.cayenne.testdo.testmap.Artist;
  import org.apache.cayenne.testdo.testmap.Painting;
  import org.apache.cayenne.unit.di.runtime.CayenneProjects;
  import org.apache.cayenne.unit.di.runtime.RuntimeCase;
  import org.apache.cayenne.unit.di.runtime.UseCayenneRuntime;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  @UseCayenneRuntime(CayenneProjects.TESTMAP_PROJECT)
  public class DeleteObjectIT extends RuntimeCase {
  
      @Inject
      protected DataContext context;
  
      @Inject
      protected DBHelper dbHelper;
  
      protected TableHelper tArtist;
      protected TableHelper tPainting;
  
      @Before
      public void setUp() throws Exception {
          tArtist = new TableHelper(dbHelper, "ARTIST");
          tArtist.setColumns("ARTIST_ID", "ARTIST_NAME");
  
          tPainting = new TableHelper(dbHelper, "PAINTING");
          tPainting.setColumns("PAINTING_ID", "PAINTING_TITLE", "ARTIST_ID");
      }
  
      protected void createHollowDataSet() throws Exception {
          tArtist.insert(1, "artist1");
          tPainting.insert(1, "painting1", 1);
      }
  
      protected void createObjectDataSet() throws Exception {
          tArtist.insert(1, "artist1");
      }
  
      protected void createObjectsDataSet() throws Exception {
          tArtist.insert(1, "artist1");
          tArtist.insert(2, "artist2");
      }
  
      protected void createObjectsRelationshipCollectionDataSet() throws Exception {
          tArtist.insert(1, "artist1");
          tPainting.insert(1, "painting1", 1);
          tPainting.insert(2, "painting2", 1);
          tPainting.insert(3, "painting3", 1);
      }
  
      @Test
      public void testDeleteObject() throws Exception {
          createObjectDataSet();
  
          Artist artist = Cayenne.objectForPK(context, Artist.class, 1);
          assertEquals(PersistenceState.COMMITTED, artist.getPersistenceState());
          context.deleteObject(artist);
          assertEquals(PersistenceState.DELETED, artist.getPersistenceState());
          context.commitChanges();
          assertEquals(PersistenceState.TRANSIENT, artist.getPersistenceState());
          assertNull(artist.getObjectContext());
      }
  
      @Test
      public void testDeleteObjects1() throws Exception {
          createObjectsDataSet();
  
          List<Artist> artists = ObjectSelect.query(Artist.class).select(context);
          assertEquals(2, artists.size());
  
          for (Artist object : artists) {
              assertEquals(PersistenceState.COMMITTED, object.getPersistenceState());
          }
  
          context.deleteObjects(artists);
  
          for (Artist object : artists) {
              assertEquals(PersistenceState.DELETED, object.getPersistenceState());
          }
      }
  
      // Similar to testDeleteObjects2, but extract ObjectContext instead of
      // DataContext.
      @Test
      public void testDeleteObjects2() throws Exception {
          createObjectsDataSet();
  
          List<Artist> artists = ObjectSelect.query(Artist.class).select(context);
          assertEquals(2, artists.size());
  
          for (Artist object : artists) {
              assertEquals(PersistenceState.COMMITTED, object.getPersistenceState());
          }
  
          artists.get(0).getObjectContext().deleteObjects(artists);
  
          for (Artist object : artists) {
              assertEquals(PersistenceState.DELETED, object.getPersistenceState());
          }
  
          artists.get(0).getObjectContext().commitChanges();
  
          for (Artist object : artists) {
              assertEquals(PersistenceState.TRANSIENT, object.getPersistenceState());
          }
      }
  
      @Test
      public void testDeleteObjectsRelationshipCollection() throws Exception {
          createObjectsRelationshipCollectionDataSet();
  
          Artist artist = Cayenne.objectForPK(context, Artist.class, 1);
          List<Painting> paintings = artist.getPaintingArray();
  
          assertEquals(3, paintings.size());
  
          // create a clone to be able to inspect paintings after deletion
          List<Painting> paintingsClone = new ArrayList<Painting>(paintings);
  
          for (Painting object : paintingsClone) {
              assertEquals(PersistenceState.COMMITTED, object.getPersistenceState());
          }
  
          context.deleteObjects(paintings);
  
          // as Painting -> Artist has Nullify rule, relationship list has to be
          // cleaned up,
          // and no exceptions thrown on concurrent modification...
          ObjRelationship r = context.getEntityResolver().getObjEntity(Painting.class).getRelationship("toArtist");
          assertEquals(DeleteRule.NULLIFY, r.getDeleteRule());
          assertEquals(0, paintings.size());
  
          for (Painting object : paintingsClone) {
              assertEquals(PersistenceState.DELETED, object.getPersistenceState());
          }
      }
  
      @Test
      public void testDeleteObjectInIterator() throws Exception {
          createObjectsRelationshipCollectionDataSet();
  
          Artist artist = Cayenne.objectForPK(context, Artist.class, 1);
          List<Painting> paintings = artist.getPaintingArray();
  
          assertEquals(3, paintings.size());
  
          // create a clone to be able to inspect paintings after deletion
          List<Painting> paintingsClone = new ArrayList<Painting>(paintings);
  
          for (Painting object : paintingsClone) {
              assertEquals(PersistenceState.COMMITTED, object.getPersistenceState());
          }
  
          Iterator<Painting> deleteIt = paintings.iterator();
          while (deleteIt.hasNext()) {
              Painting object = deleteIt.next();
              deleteIt.remove();
              context.deleteObjects(object);
          }
  
          // relationship list has to be cleaned up,
          // and no exceptions thrown on concurrent modification...
          assertEquals(0, paintings.size());
  
          for (Painting object : paintingsClone) {
              assertEquals(PersistenceState.DELETED, object.getPersistenceState());
          }
      }
  
      @Test
      public void testDeleteHollow() throws Exception {
          createHollowDataSet();
  
          List<Painting> paintings = ObjectSelect.query(Painting.class).select(context);
  
          Painting p = paintings.get(0);
          Artist a = p.getToArtist();
  
          assertEquals(PersistenceState.HOLLOW, a.getPersistenceState());
          context.deleteObjects(a);
          assertEquals(PersistenceState.DELETED, a.getPersistenceState());
      }
  
      @Test
      public void testDeleteNew() throws Exception {
          Artist artist = context.newObject(Artist.class);
          artist.setArtistName("a");
  
          assertEquals(PersistenceState.NEW, artist.getPersistenceState());
          context.deleteObjects(artist);
          assertEquals(PersistenceState.TRANSIENT, artist.getPersistenceState());
          context.rollbackChanges();
          assertEquals(PersistenceState.TRANSIENT, artist.getPersistenceState());
      }
  
  }
  