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 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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 *
 *    http://www.apache.org/licenses/LICENSE-2.0
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 *  KIND, either express or implied.  See the License for the
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package org.apache.cayenne.configuration.server;

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);
    }
}