ERMemoryAdaptor.java

package er.memoryadaptor;

import com.webobjects.eoaccess.EOAdaptor;
import com.webobjects.eoaccess.EOAdaptorContext;
import com.webobjects.eoaccess.EOModel;
import com.webobjects.eoaccess.EOSQLExpressionFactory;
import com.webobjects.eoaccess.EOSchemaGeneration;
import com.webobjects.eoaccess.EOSynchronizationFactory;
import com.webobjects.foundation.NSDictionary;

/**
 * ERMemoryAdaptor is an EOAdaptor implementation that runs entirely in memory.  There is currently
 * no persistent datastore, but this provides a useful mechanism for writing testcases or simply
 * testing a model without the overhead of setting up a database.  Internally, ERMemoryAdaptor
 * just keeps a dictionary that maps entities to arrays of row dictionaries (it looks a lot like
 * the snapshot cache).
 * 
 * @author mschrag
 */
public class ERMemoryAdaptor extends EOAdaptor {

	private Object _syncFactory;

	public ERMemoryAdaptor(String name) {
		super(name);
	}

	@Override
	public void setConnectionDictionary(NSDictionary dictionary) {
		if (dictionary == null) {
			super.setConnectionDictionary(NSDictionary.<String, Object> emptyDictionary());
		}
		else {
			super.setConnectionDictionary(dictionary);
		}
	}

	@Override
	public void assertConnectionDictionaryIsValid() {
		// DO NOTHING
	}

	@Override
	public EOAdaptorContext createAdaptorContext() {
		return new ERMemoryAdaptorContext(this);
	}

	@Override
	public boolean isValidQualifierType(String typeName, EOModel model) {
		return true;
	}

	// Required for Migrations
	@Override
	public Class defaultExpressionClass() {
		return ERMemoryExpression.class;
	}

	@Override
	public EOSQLExpressionFactory expressionFactory() {
		return null; // new ERMemoryExpressionFactory(this);
	}

	@Override
	public EOSchemaGeneration synchronizationFactory() {
		if (_syncFactory == null) {
			_syncFactory = new ERMemorySynchronizationFactory(this);
		}
		return (EOSchemaGeneration) _syncFactory;
	}

	// MS: This has to return null to prevent a stack overflow in 5.4.
	@Override
	public EOSynchronizationFactory schemaSynchronizationFactory() {
		return null;
	}
}