EDIT

// $Id$

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.view.datasource;

import java.sql.SQLException;

import java.util.HashMap;

import java.util.Map;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Status;

import org.eclipse.core.runtime.jobs.Job;

import org.eclipse.jface.viewers.StructuredViewer;

import eu.etaxonomy.cdm.database.ICdmDataSource;

import eu.etaxonomy.cdm.model.common.CdmMetaData;

import eu.etaxonomy.cdm.model.common.CdmMetaData.MetaDataPropertyName;

import eu.etaxonomy.taxeditor.store.StoreUtil;

import eu.etaxonomy.taxeditor.store.singlesource.widget.DisplayProxy;

/**

 * <p>CdmMetaDataAwareDataSourceContainer class.</p>

 *

 * @author n.hoffmann

 * @created Sep 22, 2010

 * @version 1.0

 */

public class CdmMetaDataAwareDataSourceContainer {

	private class MetaDataJob extends Job{

		/**

		 * @param name

		 */

		public MetaDataJob(String dataSourceName) {

			super("Retrieving meta data for datasource: " + dataSourceName);

		}

		/* (non-Javadoc)

		 * @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor)

		 */

		@Override

		protected IStatus run(IProgressMonitor monitor) {

			if(!monitor.isCanceled()){

				try {

					running = dataSource.testConnection();

				} catch (Exception e) {

					running = false;

				}

			}

			if(!monitor.isCanceled()){

				getMetaDataFromDataSource(dataSource);

			}

			if(!monitor.isCanceled()){

				DisplayProxy.getDefault().asyncExec(new Runnable(){

					@Override

					public void run() {

						viewer.update(CdmMetaDataAwareDataSourceContainer.this, null);

					}

				});

			}

			return monitor.isCanceled() ? Status.CANCEL_STATUS : Status.OK_STATUS;

		}

	}

	/** Constant <code>DEFAULT_ENTRY="-"</code> */

	public static final String DEFAULT_ENTRY = "-";

	private ICdmDataSource dataSource;

	private boolean running;

	private Map<MetaDataPropertyName, String> metaDataMap;

	private StructuredViewer viewer;

	private MetaDataJob job;

	/**

	 * <p>Constructor for CdmMetaDataAwareDataSourceContainer.</p>

	 *

	 * @param dataSource a {@link eu.etaxonomy.cdm.database.ICdmDataSource} object.

	 * @param view a {@link eu.etaxonomy.taxeditor.view.datasource.CdmDataSourceViewPart} object.

	 */

	public CdmMetaDataAwareDataSourceContainer(ICdmDataSource dataSource, CdmDataSourceViewPart view){

		this.dataSource = dataSource;

		this.viewer = view.getViewer();

		metaDataMap = getDefaultMetaDataMap();

		job = new MetaDataJob(dataSource.getName());

		job.setPriority(Job.DECORATE);

		view.getService().schedule(job);

	}

	/**

	 * <p>Getter for the field <code>dataSource</code>.</p>

	 *

	 * @return the dataSource

	 */

	public ICdmDataSource getDataSource() {

		return dataSource;

	}

	private void getMetaDataFromDataSource(ICdmDataSource dataSource){

		try {

			if(isRunning()){

				try {

					for(MetaDataPropertyName metaDataPropertyName : MetaDataPropertyName.values()){

						Object result = dataSource.getSingleValue(metaDataPropertyName.getSqlQuery());

						if(result != null){

							metaDataMap.put(metaDataPropertyName, (String) result);

						}						

					}		

					dataSource.closeOpenConnections();

				} catch (SQLException e) {

					StoreUtil.warn(this.getClass(), "SQLException when trying to access: " + dataSource.getName() + ". " + e.getMessage());

				} 

			}

		} catch (Exception e) {

			StoreUtil.error(this.getClass(), e);

		}

	}

	private Map<MetaDataPropertyName, String> getDefaultMetaDataMap(){

		Map<MetaDataPropertyName, String> resultMap = new HashMap<MetaDataPropertyName, String>(MetaDataPropertyName.values().length);

		for(MetaDataPropertyName metaDataPropertyName : MetaDataPropertyName.values()){

			resultMap.put(metaDataPropertyName, null);

		}

		return resultMap;

	}

	/**

	 * <p>Getter for the field <code>metaDataMap</code>.</p>

	 *

	 * @return the metaDataMap

	 */

	public Map<MetaDataPropertyName, String> getMetaDataMap() {

		return metaDataMap;

	}

	/**

	 * <p>isDataSourceCompatible</p>

	 *

	 * @return a boolean.

	 */

	public boolean isDataSourceCompatible(){

		String version = metaDataMap.get(MetaDataPropertyName.DB_SCHEMA_VERSION);

		return version == null ? false : CdmMetaData.isDbSchemaVersionCompatible(version);

	}

	/**

	 * <p>getMetaData</p>

	 *

	 * @param metaDataPropertyName a {@link eu.etaxonomy.cdm.model.common.CdmMetaData.MetaDataPropertyName} object.

	 * @return a {@link java.lang.String} object.

	 */

	public String getMetaData(MetaDataPropertyName metaDataPropertyName){

		String property = metaDataMap.get(metaDataPropertyName);

		return property != null ? property : DEFAULT_ENTRY;

	}

	/**

	 * <p>isRunning</p>

	 *

	 * @return the running

	 */

	public boolean isRunning() {

		return running;

	}

	/* (non-Javadoc)

	 * @see java.lang.Object#toString()

	 */

	/** {@inheritDoc} */

	@Override

	public String toString() {

		return dataSource.getName();

	}

	/**

	 * <p>dispose</p>

	 */

	public void dispose(){

		job.cancel();

	}

}