/**
 * AnalyzerBeans
 * Copyright (C) 2014 Neopost - Customer Information Management
 *
 * 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
 */
package org.eobjects.analyzer.connection;

import java.io.File;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.List;

import org.eobjects.analyzer.util.ReadObjectBuilder;
import org.apache.metamodel.DataContext;
import org.apache.metamodel.DataContextFactory;
import org.apache.metamodel.xml.XmlSaxDataContext;
import org.apache.metamodel.xml.XmlSaxTableDef;

/**
 * Datastore implementation for XML files.
 */
public class XmlDatastore extends UsageAwareDatastore<DataContext> implements FileDatastore {

    private static final long serialVersionUID = 1L;

    private final String _filename;
    private final XmlSaxTableDef[] _tableDefs;

    public XmlDatastore(String name, String filename) {
        this(name, filename, null);
    }

    public XmlDatastore(String name, String filename, XmlSaxTableDef[] tableDefs) {
        super(name);
        _filename = filename;
        _tableDefs = tableDefs;
    }

    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
        ReadObjectBuilder.create(this, XmlDatastore.class).readObject(stream);
    }

    @Override
    public String getFilename() {
        return _filename;
    }

    public XmlSaxTableDef[] getTableDefs() {
        return _tableDefs;
    }

    @Override
    protected UsageAwareDatastoreConnection<DataContext> createDatastoreConnection() {
        final File file = new File(_filename);
        final DataContext dataContext;
        if (_tableDefs == null || _tableDefs.length == 0) {
            dataContext = DataContextFactory.createXmlDataContext(file, true);
        } else {
            dataContext = new XmlSaxDataContext(file, _tableDefs);
        }
        return new DatastoreConnectionImpl<DataContext>(dataContext, this);
    }

    @Override
    public PerformanceCharacteristics getPerformanceCharacteristics() {
        return new PerformanceCharacteristicsImpl(false, true);
    }

    @Override
    protected void decorateIdentity(List<Object> identifiers) {
        super.decorateIdentity(identifiers);
        identifiers.add(_filename);
        identifiers.add(_tableDefs);
    }
}