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Relational Persistence for Java
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//$Id: ClassMetadata.java 7516 2005-07-16 22:20:48Z oneovthafew $
package org.hibernate.metadata;

import java.io.Serializable;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.EntityMode;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.type.Type;

/**
 * Exposes entity class metadata to the application
 *
 * @see org.hibernate.SessionFactory#getClassMetadata(Class)
 * @author Gavin King
 */
public interface ClassMetadata {

	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // stuff that is persister-centric and/or EntityInfo-centric ~~~~~~~~~~~~~~
	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	/**
	 * The name of the entity
	 */
	public String getEntityName();

	/**
	 * Get the name of the identifier property (or return null)
	 */
	public String getIdentifierPropertyName();

	/**
	 * Get the names of the class' persistent properties
	 */
	public String[] getPropertyNames();

	/**
	 * Get the identifier Hibernate type
	 */
	public Type getIdentifierType();

	/**
	 * Get the Hibernate types of the class properties
	 */
	public Type[] getPropertyTypes();

	/**
	 * Get the type of a particular (named) property
	 */
	public Type getPropertyType(String propertyName) throws HibernateException;

	/**
	 * Does this class support dynamic proxies?
	 */
	public boolean hasProxy();

	/**
	 * Are instances of this class mutable?
	 */
	public boolean isMutable();

	/**
	 * Are instances of this class versioned by a timestamp or version number column?
	 */
	public boolean isVersioned();

	/**
	 * Get the index of the version property
	 */
	public int getVersionProperty();

	/**
	 * Get the nullability of the class' persistent properties
	 */
	public boolean[] getPropertyNullability();


	/**
	 * Get the "laziness" of the properties of this class
	 */
	public boolean[] getPropertyLaziness();

	/**
	 * Does this class have an identifier property?
	 */
	public boolean hasIdentifierProperty();

	/**
	 * Does this entity declare a natural id?
	 */
	public boolean hasNaturalIdentifier();

	/**
	 * Which properties hold the natural id?
	 */
	public int[] getNaturalIdentifierProperties();
	
	/**
	 * Does this entity have mapped subclasses?
	 */
	public boolean hasSubclasses();
	
	/**
	 * Does this entity extend a mapped superclass?
	 */
	public boolean isInherited();
	
	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	// stuff that is tuplizer-centric, but is passed a session ~~~~~~~~~~~~~~~~
	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	/**
	 * Return the values of the mapped properties of the object
	 */
	public Object[] getPropertyValuesToInsert(Object entity, Map mergeMap, SessionImplementor session) 
	throws HibernateException;


	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	// stuff that is Tuplizer-centric ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	/**
	 * The persistent class, or null
	 */
	public Class getMappedClass(EntityMode entityMode);

	/**
	 * Create a class instance initialized with the given identifier
	 */
	public Object instantiate(Serializable id, EntityMode entityMode) throws HibernateException;

	/**
	 * Get the value of a particular (named) property
	 */
	public Object getPropertyValue(Object object, String propertyName, EntityMode entityMode) throws HibernateException;

	/**
	 * Extract the property values from the given entity.
	 *
	 * @param entity The entity from which to extract the property values.
	 * @param entityMode The entity-mode of the given entity
	 * @return The property values.
	 * @throws HibernateException
	 */
	public Object[] getPropertyValues(Object entity, EntityMode entityMode) throws HibernateException;

	/**
	 * Set the value of a particular (named) property
	 */
	public void setPropertyValue(Object object, String propertyName, Object value, EntityMode entityMode) throws HibernateException;

	/**
	 * Set the given values to the mapped properties of the given object
	 */
	public void setPropertyValues(Object object, Object[] values, EntityMode entityMode) throws HibernateException;

	/**
	 * Get the identifier of an instance (throw an exception if no identifier property)
	 */
	public Serializable getIdentifier(Object entity, EntityMode entityMode) throws HibernateException;

	/**
	 * Set the identifier of an instance (or do nothing if no identifier property)
	 */
	public void setIdentifier(Object object, Serializable id, EntityMode entityMode) throws HibernateException;

	/**
	 * Does the class implement the Lifecycle interface?
	 */
	public boolean implementsLifecycle(EntityMode entityMode);

	/**
	 * Does the class implement the Validatable interface?
	 */
	public boolean implementsValidatable(EntityMode entityMode);

	/**
	 * Get the version number (or timestamp) from the object's version property
	 * (or return null if not versioned)
	 */
	public Object getVersion(Object object, EntityMode entityMode) throws HibernateException;

}