SimpleGraphSessionImpl.java

/**
 * OpenSpotLight - Open Source IT Governance Platform
 *
 * Copyright (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA
 * or third-party contributors as indicated by the @author tags or express
 * copyright attribution statements applied by the authors.  All third-party
 * contributions are distributed under license by CARAVELATECH CONSULTORIA E
 * TECNOLOGIA EM INFORMATICA LTDA.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License  for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 ***********************************************************************
 * OpenSpotLight - Plataforma de Governança de TI de Código Aberto
 *
 * Direitos Autorais Reservados (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA
 * EM INFORMATICA LTDA ou como contribuidores terceiros indicados pela etiqueta
 * @author ou por expressa atribuição de direito autoral declarada e atribuída pelo autor.
 * Todas as contribuições de terceiros estão distribuídas sob licença da
 * CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA.
 *
 * Este programa é software livre; você pode redistribuí-lo e/ou modificá-lo sob os
 * termos da Licença Pública Geral Menor do GNU conforme publicada pela Free Software
 * Foundation.
 *
 * Este programa é distribuído na expectativa de que seja útil, porém, SEM NENHUMA
 * GARANTIA; nem mesmo a garantia implícita de COMERCIABILIDADE OU ADEQUAÇÃO A UMA
 * FINALIDADE ESPECÍFICA. Consulte a Licença Pública Geral Menor do GNU para mais detalhes.
 *
 * Você deve ter recebido uma cópia da Licença Pública Geral Menor do GNU junto com este
 * programa; se não, escreva para:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
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 */

package org.openspotlight.graph;

import java.util.HashMap;
import java.util.Map;

import org.openspotlight.common.Disposable;
import org.openspotlight.graph.internal.NodeAndLinkSupport;
import org.openspotlight.graph.manipulation.GraphReader;
import org.openspotlight.graph.manipulation.GraphTransientWriter;
import org.openspotlight.security.authz.PolicyEnforcement;
import org.openspotlight.security.idm.User;
import org.openspotlight.storage.PartitionFactory;
import org.openspotlight.storage.StorageSession;

import com.google.inject.Provider;

public class SimpleGraphSessionImpl implements SimpleGraphSession {

    private final PartitionFactory                factory;

    private final Map<GraphLocation, GraphReader> readerCache = new HashMap<GraphLocation, GraphReader>();
    private final GraphTransientWriter            transientWriter;
    protected final Provider<StorageSession>      sessionProvider;

    public SimpleGraphSessionImpl(
                                  final Provider<StorageSession> sessionProvider,
                                  final PartitionFactory factory) {
        transientWriter = new GraphTransientWriterImpl();
        this.sessionProvider = sessionProvider;
        this.factory = factory;
    }

    @Override
    public void closeResources() {
        if (sessionProvider instanceof Disposable) {
            ((Disposable) sessionProvider).closeResources();
        }
    }

    @Override
    public void flushChangedProperties(final Node node) {
        final StorageSession session = sessionProvider.get();
        final org.openspotlight.storage.domain.StorageNode stNode = NodeAndLinkSupport
                .retrievePreviousNode(factory, session,
                        from(GraphLocation.SERVER).getContext(node), node,
                        false);
        session.flushTransient();
    }

    @Override
    public GraphReader from(final GraphLocation location) {
        GraphReader reader = readerCache.get(location);
        if (reader == null) {
            reader = new GraphReaderImpl(sessionProvider, location, factory);
            readerCache.put(location, reader);
        }
        return reader;
    }

    @Override
    public PolicyEnforcement getPolicyEnforcement() {
        throw new UnsupportedOperationException();
    }

    @Override
    public User getUser() {
        throw new UnsupportedOperationException();
    }

    @Override
    public GraphTransientWriter toTransient() {
        return transientWriter;
    }

}