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.common;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeSupport;

import java.io.Serializable;

import java.lang.reflect.Method;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import java.util.UUID;

import javax.persistence.Basic;

import javax.persistence.Column;

import javax.persistence.FetchType;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.ManyToOne;

import javax.persistence.MappedSuperclass;

import javax.persistence.Transient;

import javax.validation.constraints.Min;

import javax.validation.constraints.NotNull;

import javax.xml.bind.annotation.XmlAccessType;

import javax.xml.bind.annotation.XmlAccessorType;

import javax.xml.bind.annotation.XmlAttribute;

import javax.xml.bind.annotation.XmlElement;

import javax.xml.bind.annotation.XmlID;

import javax.xml.bind.annotation.XmlIDREF;

import javax.xml.bind.annotation.XmlSchemaType;

import javax.xml.bind.annotation.XmlTransient;

import javax.xml.bind.annotation.XmlType;

import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

import org.apache.commons.lang3.StringUtils;

import org.apache.log4j.Logger;

import org.hibernate.annotations.NaturalId;

import org.hibernate.annotations.Type;

import org.hibernate.envers.Audited;

import org.hibernate.search.annotations.Analyze;

import org.hibernate.search.annotations.DocumentId;

import org.hibernate.search.annotations.Field;

import org.hibernate.search.annotations.FieldBridge;

import org.hibernate.search.annotations.Index;

import org.hibernate.search.annotations.Store;

import org.joda.time.DateTime;

import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;

import eu.etaxonomy.cdm.hibernate.search.DateTimeBridge;

import eu.etaxonomy.cdm.hibernate.search.NotNullAwareIdBridge;

import eu.etaxonomy.cdm.hibernate.search.UuidBridge;

import eu.etaxonomy.cdm.jaxb.DateTimeAdapter;

import eu.etaxonomy.cdm.jaxb.UUIDAdapter;

import eu.etaxonomy.cdm.model.NewEntityListener;

import eu.etaxonomy.cdm.model.permission.User;

import eu.etaxonomy.cdm.strategy.match.IMatchStrategyEqual;

import eu.etaxonomy.cdm.strategy.match.IMatchable;

import eu.etaxonomy.cdm.strategy.match.Match;

import eu.etaxonomy.cdm.strategy.match.MatchMode;

/**

 * The base class for all CDM domain classes implementing UUIDs and bean property change event firing.

 * It provides a globally unique UUID and keeps track of creation date and person.

 * The UUID is the same for different versions (see {@link VersionableEntity}) of a CDM object, so a locally unique id exists in addition

 * that allows to safely access and store several objects (=version) with the same UUID.

 *

 * This class together with the {@link eu.etaxonomy.cdm.aspectj.PropertyChangeAspect}

 * will fire bean change events to all registered listeners. Listener registration and event firing

 * is done with the help of the {@link PropertyChangeSupport} class.

 *

 * @author m.doering

 *

 */

@XmlAccessorType(XmlAccessType.FIELD)

@XmlType(name = "CdmBase", propOrder = {

    "created",

    "createdBy"

})

@MappedSuperclass

public abstract class CdmBase implements Serializable, ICdmBase, ISelfDescriptive, Cloneable{

    private static final long serialVersionUID = -3053225700018294809L;

    @SuppressWarnings("unused")

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

    protected static final int CLOB_LENGTH = 65536;

    @Transient

    @XmlTransient

    private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

    @Transient

    @XmlTransient

    private static NewEntityListener newEntityListener;

    //@XmlAttribute(name = "id", required = true)

    @XmlTransient

    @Id

//	@GeneratedValue(generator = "system-increment")  //see also AuditEvent.revisionNumber

//	@GeneratedValue(generator = "enhanced-table")

    @GeneratedValue(generator = "custom-enhanced-table")

    @DocumentId

    @FieldBridge(impl=NotNullAwareIdBridge.class)

    @Match(MatchMode.IGNORE)

    @NotNull

    @Min(0)

    @Audited

    private int id;

    @XmlAttribute(required = true)

    @XmlJavaTypeAdapter(UUIDAdapter.class)

    @XmlID

    @Type(type="uuidUserType")

    @NaturalId // This has the effect of placing a "unique" constraint on the database column

    @Column(length=36)  //TODO needed? Type UUID will always assure that is exactly 36

    @Match(MatchMode.IGNORE)

    @NotNull

    @Field(store = Store.YES, index = Index.YES, analyze = Analyze.NO)

    @FieldBridge(impl = UuidBridge.class)

    @Audited

    protected UUID uuid;

    @XmlElement (name = "Created", type= String.class)

    @XmlJavaTypeAdapter(DateTimeAdapter.class)

    @Type(type="dateTimeUserType")

    @Basic(fetch = FetchType.LAZY)

    @Match(MatchMode.IGNORE)

    @Field(analyze = Analyze.NO)

    @FieldBridge(impl = DateTimeBridge.class)

    @Audited

    private DateTime created;

    @XmlElement (name = "CreatedBy")

    @XmlIDREF

    @XmlSchemaType(name = "IDREF")

    @ManyToOne(fetch=FetchType.LAZY)

    @Match(MatchMode.IGNORE)

    @Audited

    private User createdBy;

    /**

     * Class constructor assigning a unique UUID and creation date.

     * UUID can be changed later via setUuid method.

     */

    public CdmBase() {

        this.uuid = UUID.randomUUID();

        this.created = new DateTime().withMillisOfSecond(0);

    }

    public static void setNewEntityListener(NewEntityListener nel) {

        newEntityListener = nel;

    }

    public static void fireOnCreateEvent(CdmBase cdmBase) {

        if(newEntityListener != null) {

            newEntityListener.onCreate(cdmBase);

        }

    }

    /**

     * see {@link PropertyChangeSupport#addPropertyChangeListener(PropertyChangeListener)}

     * @param listener

     */

    public void addPropertyChangeListener(PropertyChangeListener listener) {

        propertyChangeSupport.addPropertyChangeListener(listener);

    }

    /**

     * see {@link PropertyChangeSupport#addPropertyChangeListener(String, PropertyChangeListener)}

     */

    public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {

        propertyChangeSupport.addPropertyChangeListener(propertyName, listener);

    }

    /**

     * see {@link PropertyChangeSupport#addPropertyChangeListener(PropertyChangeListener)}

     */

    public void removePropertyChangeListener(PropertyChangeListener listener) {

        propertyChangeSupport.removePropertyChangeListener(listener);

    }

    /**

     * @see PropertyChangeSupport#addPropertyChangeListener(String, PropertyChangeListener)

     */

    public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {

        propertyChangeSupport.removePropertyChangeListener(propertyName, listener);

    }

    public boolean hasListeners(String propertyName) {

        return propertyChangeSupport.hasListeners(propertyName);

    }

    public void firePropertyChange(String property, String oldval, String newval) {

        propertyChangeSupport.firePropertyChange(property, oldval, newval);

    }

    public void firePropertyChange(String property, int oldval, int newval) {

        propertyChangeSupport.firePropertyChange(property, oldval, newval);

    }

    public void firePropertyChange(String property, float oldval, float newval) {

        propertyChangeSupport.firePropertyChange(property, oldval, newval);

    }

    public void firePropertyChange(String property, boolean oldval, boolean newval) {

        propertyChangeSupport.firePropertyChange(property, oldval, newval);

    }

    public void firePropertyChange(String property, Object oldval, Object newval) {

        propertyChangeSupport.firePropertyChange(property, oldval, newval);

    }

    public void firePropertyChange(PropertyChangeEvent evt) {

        propertyChangeSupport.firePropertyChange(evt);

    }

    /**

     * This method was initially added to {@link CdmBase} to fix #5161.

     * It can be overridden by subclasses such as {@link IdentifiableEntity}

     * to explicitly initialize listeners. This is needed e.g. after de-serialization

     * as listeners are not serialized due to the @Transient annotation.

     * However, it can be generally used for other use-cases as well

     */

    public void initListener() {}

    /**

     * Adds an item to a set of <code>this</code> object and fires the according

     * {@link PropertyChangeEvent}. Workaround as long as add and remove is not yet

     * implemented in aspectJ.

     * @param set the set the new item is added to

     * @param newItem the new item to be added to the set

     * @param propertyName the name of the set as property in <code>this</code> object

     */

    protected <T extends CdmBase> void addToSetWithChangeEvent(Set<T> set, T newItem, String propertyName ){

        Set<T> oldValue = new HashSet<>(set);

        set.add(newItem);

        firePropertyChange(new PropertyChangeEvent(this, propertyName, oldValue, set));

    }

    /**

     * Removes an item from a set of <code>this</code> object and fires the according

     * {@link PropertyChangeEvent}. Workaround as long as add and remove is not yet

     * implemented in aspectJ.

     * @param set the set the item is to be removed from

     * @param itemToRemove the item to be removed from the set

     * @param propertyName the name of the set as property in <code>this</code> object

     */

    protected <T extends CdmBase> void removeFromSetWithChangeEvent(Set<T> set, T itemToRemove, String propertyName ){

        Set<T> oldValue = new HashSet<T>(set);

        set.remove(itemToRemove);

        firePropertyChange(new PropertyChangeEvent(this, propertyName, oldValue, set));

    }

    @Override

    public UUID getUuid() {

        return uuid;

    }

    @Override

    public void setUuid(UUID uuid) {

        this.uuid = uuid;

    }

    @Override

    public int getId() {

        return this.id;

    }

    @Override

    public void setId(int id) {  //see #265 (private ?)

        this.id = id;

    }

    @Override

    public DateTime getCreated() {

        return created;

    }

    @Override

    public void setCreated(DateTime created) {

        if (created != null){

            created = created.withMillisOfSecond(0);

            //created.set(Calendar.MILLISECOND, 0);  //old, can be deleted

        }

        this.created = created;

    }

    @Override

    public User getCreatedBy() {

        return this.createdBy;

    }

    @Override

    public void setCreatedBy(User createdBy) {

        this.createdBy = createdBy;

    }

// ************************** Hibernate proxies *******************/

    /**

     * If entity is a HibernateProxy it returns the initialized object.

     * Otherwise entity itself is returned.

     * @param entity

     * @return

     * @throws ClassCastException

     */

    public static <T> T deproxy(T entity) {

        return HibernateProxyHelper.deproxy(entity);

    }

    /**

     * These methods are present due to HHH-1517 - that in a one-to-many

     * relationship with a superclass at the "one" end, the proxy created

     * by hibernate is the superclass, and not the subclass, resulting in

     * a ClassCastException when you try to cast it.

     *

     * Hopefully this will be resolved through improvements with the creation of

     * proxy objects by hibernate and the following methods will become redundant,

     * but for the time being . . .

     * @param <T>

     * @param object

     * @param clazz

     * @return

     * @throws ClassCastException

     */

    //non-static does not work because javassist already unwrapps the proxy before calling the method

     public static <T extends CdmBase> T deproxy(Object object, Class<T> clazz) throws ClassCastException {

         return HibernateProxyHelper.deproxy(object, clazz);

     }

     @Override

     public boolean isInstanceOf(Class<? extends CdmBase> clazz) throws ClassCastException {

         return HibernateProxyHelper.isInstanceOf(this, clazz);

     }

    @Override

    @XmlTransient

    @Transient

    public boolean isPersited() {

        return id != 0;

    }

// ************* Object overrides *************************/

    /**

     * Is <code>true</code> if UUID and created timestamp (is this really needed/make sense?)

     * is the same for the passed Object and this one.

     * This method is final as subclasses should not override it.<BR>

     *

     * The contract should be the same for all persistable entities.

     * 2 instances are equal if they represent the same entity in a given

     * database.<BR>

     * NOTE: currently the method is only final in {@link VersionableEntity#equals(Object)}.

     * For discussion see #7202.

     * <BR><BR>

     *

     * If one wants to compare 2 CdmBase entities content wise you may use e.g. a

     * {@link IMatchStrategyEqual match strategy} and make sure

     * {@link IMatchable matching} is implemented for the respective CdmBase subclass.

     * You may adapt your match strategy to your own needs.

     *

     * See {@link http://www.hibernate.org/109.html hibernate109}, {@link http://www.geocities.com/technofundo/tech/java/equalhash.html geocities},

     * or {@link http://www.ibm.com/developerworks/java/library/j-jtp05273.html ibm}

     * for more information about equals and hashcode.

     * <BR>

     * See also https://dev.e-taxonomy.eu/redmine/issues/7155 and related tickets for discussion.

     *

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

     *

     */

    @Override

    public boolean equals(Object obj) {

        if (obj == this){

            return true;

        }

        if (obj == null){

            return false;

        }

        if (!CdmBase.class.isAssignableFrom(obj.getClass())){

            return false;

        }

        ICdmBase cdmObj = (ICdmBase)obj;

        UUID objUuid = cdmObj.getUuid();

        if (objUuid == null){

            throw new NullPointerException("CdmBase is missing UUID");

        }

        boolean uuidEqual = objUuid.equals(this.getUuid());

        //TODO is this still needed?

//        boolean createdEqual = CdmUtils.nullSafeEqual(cdmObj.getCreated(), this.getCreated());

        boolean createdEqual = true; //preliminary, to test im createdEqual is still needed #7201

        if (! uuidEqual || !createdEqual){

                return false;

        }

        return true;

    }

    /** Overrides {@link java.lang.Object#hashCode()}

     *  See {@link http://www.hibernate.org/109.html hibernate109}, {@link http://www.geocities.com/technofundo/tech/java/equalhash.html geocities}

     * or {@link http://www.ibm.com/developerworks/java/library/j-jtp05273.html ibm}

     * for more information about equals and hashcode.

     */

    @Override

    public int hashCode() {

           int hashCode = 7;

           if(this.getUuid() != null) {

               //this unfortunately leads to errors when loading maps via hibernate

               //as hibernate computes hash values for CdmBase objects used as key at

               // a time when the uuid is not yet loaded from the database. Therefore

               //the hash values later change and give wrong results when retrieving

               //data from the map (map.get(key) returns null, though there is an entry

               //for key in the map.

               //see further comments in #2114

               int result = 29 * hashCode + this.getUuid().hashCode();

//		       int shresult = 29 * hashCode + Integer.valueOf(this.getId()).hashCode();

               return result;

           } else {

               return 29 * hashCode;

           }

    }

    /**

     * Overrides {@link java.lang.Object#toString()}.

     * This returns an String that identifies the object well without being necessarily unique. Internally the method is delegating the

     * call to {link {@link #instanceToString()}.<br>

     * <b>Specification:</b> This method should never call other object' methods so it can be well used for debugging

     * without problems like lazy loading, unreal states etc.

     * <p>

     * <b>Note</b>: If overriding this method's javadoc always copy or link the above requirement.

     * If not overwritten by a subclass method returns the class, id and uuid as a string for any CDM object.

     * <p>

     * <b>For example</b>: Taxon#13&lt;b5938a98-c1de-4dda-b040-d5cc5bfb3bc0&gt;

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

     */

    @Override

    public String toString() {

        return instanceToString();

    }

    /**

     * This returns an String that identifies the cdm instance well without being necessarily unique.

     * The string representation combines the class name the {@link #id} and {@link #uuid}.

     * <p>

     * <b>For example</b>: Taxon#13&lt;b5938a98-c1de-4dda-b040-d5cc5bfb3bc0&gt;

     * @return

     */

    public String instanceToString() {

        return this.getClass().getSimpleName()+"#"+this.getId()+"<"+this.getUuid()+">";

    }

// **************** invoke methods **************************/

    protected void invokeSetMethod(Method method, Object object){

        try {

            method.invoke(object, this);

        } catch (Exception e) {

            e.printStackTrace();

            //TODO handle exceptioin;

        }

    }

    protected void invokeSetMethodWithNull(Method method, Object object){

        try {

            Object[] nul = new Object[]{null};

            method.invoke(object, nul);

        } catch (Exception e) {

            e.printStackTrace();

            //TODO handle exceptioin;

        }

    }

    @Transient

	@Override

	public String getUserFriendlyTypeName(){

		return getClass().getSimpleName();

	}

	@Transient

	@Override

	public String getUserFriendlyDescription(){

		return toString();

	}

	@Override

	public String getUserFriendlyFieldName(String field){

		return field;

	}

// ********************* HELPER ****************************************/

    protected <T extends CdmBase> boolean replaceInList(List<T> list,

            T newObject, T oldObject){

        boolean result = false;

        for (int i = 0; i < list.size(); i++){

            if (list.get(i).equals(oldObject)){

                list.set(i, newObject);

                result = true;

            }

        }

        return result;

    }

    /**

     * Returns <code>true</code> if the given String is blank.

     * @param str the String to check

     * @see StringUtils#isBlank(String)

     * @return <code>true</code> if str is blank, <code>false</code> otherwise

     */

    protected static boolean isBlank(String str) {

        return StringUtils.isBlank(str);

    }

    /**

     * Returns <code>true</code> if the given String is not blank.

     * @param str the String to check

     * @see StringUtils#isNotBlank(String)

     * @return <code>true</code> if str is not blank, <code>false</code> otherwise

     */

    protected static boolean isNotBlank(String str) {

        return StringUtils.isNotBlank(str);

    }

// **************** EMPTY ************************/

    /**

     * Checks if the entity is completely empty

     * and therefore can be removed.<BR>

     *

     * To be implemented by subclasses if used

     *

     * @return <code>true</code> if empty

     */

    protected boolean checkEmpty(){

        //nothing to check; id, uuid, created and createdBy are not relevant

        return true;

    }

//********************** CLONE *****************************************/

//    protected void clone(CdmBase clone){

//        clone.setCreatedBy(createdBy);

//        clone.setId(id);

//        clone.propertyChangeSupport=new PropertyChangeSupport(clone);

//        //Constructor Attributes

//        //clone.setCreated(created);

//        //clone.setUuid(getUuid());

//

//    }

    @Override

    public CdmBase clone() throws CloneNotSupportedException{

        CdmBase result = (CdmBase)super.clone();

        result.propertyChangeSupport=new PropertyChangeSupport(result);

        //TODO ?

        result.setId(0);

        result.setUuid(UUID.randomUUID());

        result.setCreated(new DateTime());

        result.setCreatedBy(null);

        //no changes to: -

        return result;

    }

}