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  package org.apache.cayenne.configuration.runtime;
  
  import org.apache.cayenne.DataChannel;
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.access.DataContext;
  import org.apache.cayenne.access.DataDomain;
  import org.apache.cayenne.access.DataRowStore;
  import org.apache.cayenne.access.DataRowStoreFactory;
  import org.apache.cayenne.access.ObjectStore;
  import org.apache.cayenne.cache.NestedQueryCache;
  import org.apache.cayenne.cache.QueryCache;
  import org.apache.cayenne.configuration.ObjectContextFactory;
  import org.apache.cayenne.configuration.ObjectStoreFactory;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.event.EventManager;
  import org.apache.cayenne.tx.TransactionFactory;
  
  /**
   * @since 3.1
   */
  public class DataContextFactory implements ObjectContextFactory {
  
      @Inject
      protected DataDomain dataDomain;
  
      @Inject
      protected EventManager eventManager;
  
      @Inject
      protected DataRowStoreFactory dataRowStoreFactory;
      
      @Inject
      protected ObjectStoreFactory objectStoreFactory;
      
      @Inject
      protected QueryCache queryCache;
      
      @Inject
      protected TransactionFactory transactionFactory;
  
      @Override
      public ObjectContext createContext() {
          return createdFromDataDomain(dataDomain);
      }
  
      @Override
      public ObjectContext createContext(DataChannel parent) {
  
          // this switch may go away once we figure out clean property configuration...
          if (parent instanceof DataDomain) {
              return createdFromDataDomain((DataDomain) parent);
          }
          else if (parent instanceof DataContext) {
              return createFromDataContext((DataContext) parent);
          }
          else {
              return createFromGenericChannel(parent);
          }
      }
  
      protected ObjectContext createFromGenericChannel(DataChannel parent) {
  
          // for new dataRowStores use the same name for all stores
          // it makes it easier to track the event subject
          DataRowStore snapshotCache = (dataDomain.isSharedCacheEnabled())
                  ? dataDomain.getSharedSnapshotCache()
                  : dataRowStoreFactory.createDataRowStore(dataDomain.getName());
  
          DataContext context = newInstance(
                  parent, objectStoreFactory.createObjectStore(snapshotCache));
          context.setValidatingObjectsOnCommit(dataDomain.isValidatingObjectsOnCommit());
          context.setQueryCache(new NestedQueryCache(queryCache));
          return context;
      }
  
      protected ObjectContext createFromDataContext(DataContext parent) {
          // child ObjectStore should not have direct access to snapshot cache, so do not
          // pass it in constructor.
          ObjectStore objectStore = objectStoreFactory.createObjectStore(null);
  
          DataContext context = newInstance(parent, objectStore);
  
          context.setValidatingObjectsOnCommit(parent.isValidatingObjectsOnCommit());
          context.setUsingSharedSnapshotCache(parent.isUsingSharedSnapshotCache());
          context.setQueryCache(new NestedQueryCache(queryCache));
          context.setTransactionFactory(transactionFactory);
  
          return context;
      }
  
      protected ObjectContext createdFromDataDomain(DataDomain parent) {
  
          // for new dataRowStores use the same name for all stores
          // it makes it easier to track the event subject
          DataRowStore snapshotCache = (parent.isSharedCacheEnabled())
                  ? parent.getSharedSnapshotCache()
                  : dataRowStoreFactory.createDataRowStore(parent.getName());
  
          DataContext context = newInstance(
                  parent, objectStoreFactory.createObjectStore(snapshotCache));
          context.setValidatingObjectsOnCommit(parent.isValidatingObjectsOnCommit());
          context.setQueryCache(new NestedQueryCache(queryCache));
          context.setTransactionFactory(transactionFactory);
          return context;
      }
      
      protected DataContext newInstance(DataChannel parent, ObjectStore objectStore) {
          return new DataContext(parent, objectStore);
      }
  }
  