EDIT

/**

* 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.cdm.model.metadata;

import java.util.ArrayList;

import java.util.Comparator;

import java.util.List;

import java.util.UUID;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.validation.constraints.NotNull;

import javax.xml.bind.annotation.XmlAttribute;

import org.apache.log4j.Logger;

import org.hibernate.annotations.Type;

import org.joda.time.DateTime;

import eu.etaxonomy.cdm.common.monitor.IProgressMonitor;

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

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

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

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

/**

 * @author a.mueller

 * @since 07.09.2009

 */

@Entity

public class CdmMetaData extends CdmBase{

    private static final long serialVersionUID = -3033376680593279078L;

	@SuppressWarnings("unused")

	private static final Logger logger = Logger.getLogger(CdmMetaData.class);

	private static final String UNNAMED = "- UNNAMED -";

	/* It is a little bit confusing that this specific information is located in

	 * a generic class for metadata. Think about moving the schema version

	 *

	 */

	/**

	 * The database schema version number.

	 * It is recommended to have the first two numbers equal to the CDM Library version number.

	 * But it is not obligatory as there may be cases when the library number changes but the

	 * schema version is not changing.

	 * The third should be incremented if the schema changes in a way that SCHEMA_VALIDATION.UPDATE

	 * will probably not work or will not be enough to transform old data into new data.

	 * The fourth number should be incremented when minor schema changes take place that can

	 * be handled by SCHEMA_VALIDATION.UPDATE

	 * The last number represents the date of change.

	 */

	private static final String dbSchemaVersion = "5.5.0.0.20190221";

//  private static final String dbSchemaVersion = "4.7.0.0.201710040000";

//  private static final String dbSchemaVersion = "5.0.0.0.20180514";

	/* END OF CONFUSION */

	   /**

     * The {@link TermType type} of this term. Needs to be the same type in a {@link DefinedTermBase defined term}

     * and in it's {@link TermVocabulary vocabulary}.

     */

    @XmlAttribute(name ="PropertyName")

    @Column(name="propertyName", length=20)

    @NotNull

    @Type(type = "eu.etaxonomy.cdm.hibernate.EnumUserType",

        parameters = {@org.hibernate.annotations.Parameter(name  = "enumClass", value = "eu.etaxonomy.cdm.model.metadata.CdmMetaDataPropertyName")}

    )

	private CdmMetaDataPropertyName propertyName;

	private String value;

//********************* Constructor *********************************************/

	/**

	 * Simple constructor to be used by Spring

	 */

	protected CdmMetaData(){

		super();

	}

	public CdmMetaData(CdmMetaDataPropertyName propertyName, String value) {

		super();

		this.propertyName = propertyName;

		this.value = value;

	}

// ******************** STATIC **********************************/

    /**

     * @return a list of default metadata objects

     */

    public static final List<CdmMetaData> defaultMetaData(){

        List<CdmMetaData> result = new ArrayList<>();

        // schema version

        result.add(new CdmMetaData(CdmMetaDataPropertyName.DB_SCHEMA_VERSION, dbSchemaVersion));

        // database create time

        result.add(new CdmMetaData(CdmMetaDataPropertyName.DB_CREATE_DATE, new DateTime().toString()));

        result.add(new CdmMetaData(CdmMetaDataPropertyName.INSTANCE_ID, UUID.randomUUID().toString()));

        result.add(new CdmMetaData(CdmMetaDataPropertyName.INSTANCE_NAME, UNNAMED));

        return result;

    }

//****************** instance methods ****************************/

	/**

	 * @return the propertyName

	 */

	public CdmMetaDataPropertyName getPropertyName() {

		return propertyName;

	}

	/**

	 * @param propertyName the propertyName to set

	 */

	public void setPropertyName(CdmMetaDataPropertyName propertyName) {

		this.propertyName = propertyName;

	}

	/**

	 * @return the value

	 */

	public String getValue() {

		return value;

	}

	/**

	 * @param value the value to set

	 */

	public void setValue(String value) {

		this.value = value;

	}

//******************** Version comparator **********************************/

	public static class VersionComparator implements Comparator<String>{

		Integer depth;

		IProgressMonitor monitor;

		public VersionComparator(Integer depth, IProgressMonitor monitor){

			this.depth = depth;

			this.monitor = monitor;

		}

		@Override

        public int compare(String version1, String version2) {

			int result = 0;

			if (version1.equals(version2)){

			    return 0;

			}

			String[] version1Split = version1.split("\\.");

			String[] version2Split = version2.split("\\.");

			if(version1Split.length == 1 || version2Split.length == 1){

				throwException("Tried to compare version but given Strings don't seem to " +

						"contain version numbers. version1: " + version1 + ", version2:" + version2);

			}

			if(depth != null && (version1Split.length < depth || version2Split.length < depth )){

				throwException("Desired depth can not be achieved with the given strings. depth: " + depth  + ", version1: " + version1 + ", version2:" + version2);

			}

			//use the shorter version to avoid arrayOutOfBoundsException, if version2Split.length < version1Split.length but > depth

			int length = (version1Split.length < version2Split.length) ? version1Split.length: version2Split.length;

			if (depth != null){

			    length = length<depth?length:depth;

			}

			for (int i = 0; i < length; i++){

				Long version1Part = Long.valueOf(version1Split[i]);

				Long version2Part = Long.valueOf(version2Split[i]);

				int partCompare = version1Part.compareTo(version2Part);

				if (partCompare != 0){

					return partCompare;

				}

			}

			return result;

		}

		private Throwable throwException(String message){

			RuntimeException exception =  new RuntimeException(message);

			if (monitor != null){

				monitor.warning(message, exception);

			}

			throw exception;

		}

	}

	/**

	 * Compares two version string. If version1 is higher than version2 a positive result is returned.

	 * If both are equal 0 is returned, otherwise -1 is returned.

	 * @see Comparator#compare(Object, Object)

	 * @param version1

	 * @param version2

	 * @param depth

	 * @param monitor

	 * @return

	 */

	public static int compareVersion(String version1, String version2, Integer depth, IProgressMonitor monitor){

		VersionComparator versionComparator = new VersionComparator(depth, monitor);

		return versionComparator.compare(version1, version2);

	}

	public static boolean isDbSchemaVersionCompatible(String version){

		return compareVersion(dbSchemaVersion, version, 3, null) == 0;

	}

	public static String getDbSchemaVersion() {

		return dbSchemaVersion;

	}

}