SelectAbstractCommand.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
 *
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package org.openspotlight.graph.query;

import org.openspotlight.graph.query.info.SelectByLinkCountInfo;
import org.openspotlight.graph.query.info.SelectByLinkTypeInfo;
import org.openspotlight.graph.query.info.SelectByNodeTypeInfo;
import org.openspotlight.graph.query.info.SelectInfo;
import org.openspotlight.graph.query.info.SelectStatementInfo;

/**
 * The Class SLSelectAbstractCommand.
 * 
 * @author Vitor Hugo Chagas
 */
public abstract class SelectAbstractCommand {

    /**
     * Gets the execute command.
     * 
     * @param select the select
     * @param selectInfo the select info
     * @param commandDO the command do
     * @return the execute command
     */
    public static SelectAbstractCommand getCommand(final Select select,
                                                      final SelectInfo selectInfo,
                                                      final SelectCommandDO commandDO) {
        SelectAbstractCommand command = null;
        if (select instanceof SelectByNodeType) {
            final SelectByNodeTypeInfo selectByNodeTypeInfo = SelectByNodeTypeInfo.class.cast(selectInfo);
            command = new SelectByNodeTypeExecuteCommand(selectByNodeTypeInfo, commandDO);
        } else if (select instanceof SelectByLinkType) {
            final SelectByLinkTypeInfo selectByLinkTypeInfo = SelectByLinkTypeInfo.class.cast(selectInfo);
            command = new SelectByLinkTypeExecuteCommand(selectByLinkTypeInfo, commandDO);
        } else if (select instanceof SelectByLinkCount) {
            final SelectByLinkCountInfo selectByLinkCountInfo = SelectByLinkCountInfo.class.cast(selectInfo);
            command = new SelectByLinkCountExecuteCommand(selectByLinkCountInfo, commandDO);
        } else if (select instanceof SelectStatement) {
            final SelectStatementInfo selectStatementInfo = SelectStatementInfo.class.cast(selectInfo);
            if (selectStatementInfo.getByLinkInfoList().isEmpty()) {
                command = new SelectByNodeTypeCommand(selectStatementInfo, commandDO);
            } else {
                command = new SelectByLinkTypeCommand(selectStatementInfo, commandDO);
            }
        }
        return command;
    }

    /**
     * Execute.
     */
    public abstract void execute();
}