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The core O/RM functionality as provided by Hibernate
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. 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 Red Hat Inc.
 *
 * 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
 */
package org.hibernate.mapping;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.hibernate.EntityMode;
import org.hibernate.MappingException;
import org.hibernate.cfg.Mappings;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.CompositeNestedGeneratedValueGenerator;
import org.hibernate.id.IdentifierGenerator;
import org.hibernate.id.PersistentIdentifierGenerator;
import org.hibernate.id.factory.IdentifierGeneratorFactory;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.collections.JoinedIterator;
import org.hibernate.property.Setter;
import org.hibernate.tuple.component.ComponentMetamodel;
import org.hibernate.type.Type;
import org.hibernate.type.TypeFactory;

/**
 * The mapping for a component, composite element,
 * composite identifier, etc.
 *
 * @author Gavin King
 * @author Steve Ebersole
 */
public class Component extends SimpleValue implements MetaAttributable {
	private ArrayList properties = new ArrayList();
	private String componentClassName;
	private boolean embedded;
	private String parentProperty;
	private PersistentClass owner;
	private boolean dynamic;
	private Map metaAttributes;
	private String nodeName;
	private boolean isKey;
	private String roleName;

	private java.util.Map tuplizerImpls;

	public Component(Mappings mappings, PersistentClass owner) throws MappingException {
		super( mappings, owner.getTable() );
		this.owner = owner;
	}

	public Component(Mappings mappings, Component component) throws MappingException {
		super( mappings, component.getTable() );
		this.owner = component.getOwner();
	}

	public Component(Mappings mappings, Join join) throws MappingException {
		super( mappings, join.getTable() );
		this.owner = join.getPersistentClass();
	}

	public Component(Mappings mappings, Collection collection) throws MappingException {
		super( mappings, collection.getCollectionTable() );
		this.owner = collection.getOwner();
	}

	public int getPropertySpan() {
		return properties.size();
	}
	public Iterator getPropertyIterator() {
		return properties.iterator();
	}
	public void addProperty(Property p) {
		properties.add(p);
	}
	public void addColumn(Column column) {
		throw new UnsupportedOperationException("Cant add a column to a component");
	}
	public int getColumnSpan() {
		int n=0;
		Iterator iter = getPropertyIterator();
		while ( iter.hasNext() ) {
			Property p = (Property) iter.next();
			n+= p.getColumnSpan();
		}
		return n;
	}
	public Iterator getColumnIterator() {
		Iterator[] iters = new Iterator[ getPropertySpan() ];
		Iterator iter = getPropertyIterator();
		int i=0;
		while ( iter.hasNext() ) {
			iters[i++] = ( (Property) iter.next() ).getColumnIterator();
		}
		return new JoinedIterator(iters);
	}

	public void setTypeByReflection(String propertyClass, String propertyName) {}

	public boolean isEmbedded() {
		return embedded;
	}

	public String getComponentClassName() {
		return componentClassName;
	}

	public Class getComponentClass() throws MappingException {
		try {
			return ReflectHelper.classForName(componentClassName);
		}
		catch (ClassNotFoundException cnfe) {
			throw new MappingException("component class not found: " + componentClassName, cnfe);
		}
	}

	public PersistentClass getOwner() {
		return owner;
	}

	public String getParentProperty() {
		return parentProperty;
	}

	public void setComponentClassName(String componentClass) {
		this.componentClassName = componentClass;
	}

	public void setEmbedded(boolean embedded) {
		this.embedded = embedded;
	}

	public void setOwner(PersistentClass owner) {
		this.owner = owner;
	}

	public void setParentProperty(String parentProperty) {
		this.parentProperty = parentProperty;
	}

	public boolean isDynamic() {
		return dynamic;
	}

	public void setDynamic(boolean dynamic) {
		this.dynamic = dynamic;
	}

	public Type getType() throws MappingException {
		// TODO : temporary initial step towards HHH-1907
		final ComponentMetamodel metamodel = new ComponentMetamodel( this );
		final TypeFactory factory = getMappings().getTypeResolver().getTypeFactory();
		return isEmbedded() ? factory.embeddedComponent( metamodel ) : factory.component( metamodel );
	}

	public void setTypeUsingReflection(String className, String propertyName)
		throws MappingException {
	}
	
	public java.util.Map getMetaAttributes() {
		return metaAttributes;
	}
	public MetaAttribute getMetaAttribute(String attributeName) {
		return metaAttributes==null?null:(MetaAttribute) metaAttributes.get(attributeName);
	}

	public void setMetaAttributes(java.util.Map metas) {
		this.metaAttributes = metas;
	}
	
	public Object accept(ValueVisitor visitor) {
		return visitor.accept(this);
	}
	
	public boolean[] getColumnInsertability() {
		boolean[] result = new boolean[ getColumnSpan() ];
		Iterator iter = getPropertyIterator();
		int i=0;
		while ( iter.hasNext() ) {
			Property prop = (Property) iter.next();
			boolean[] chunk = prop.getValue().getColumnInsertability();
			if ( prop.isInsertable() ) {
				System.arraycopy(chunk, 0, result, i, chunk.length);
			}
			i+=chunk.length;
		}
		return result;
	}

	public boolean[] getColumnUpdateability() {
		boolean[] result = new boolean[ getColumnSpan() ];
		Iterator iter = getPropertyIterator();
		int i=0;
		while ( iter.hasNext() ) {
			Property prop = (Property) iter.next();
			boolean[] chunk = prop.getValue().getColumnUpdateability();
			if ( prop.isUpdateable() ) {
				System.arraycopy(chunk, 0, result, i, chunk.length);
			}
			i+=chunk.length;
		}
		return result;
	}
	
	public String getNodeName() {
		return nodeName;
	}
	
	public void setNodeName(String nodeName) {
		this.nodeName = nodeName;
	}
	
	public boolean isKey() {
		return isKey;
	}
	
	public void setKey(boolean isKey) {
		this.isKey = isKey;
	}
	
	public boolean hasPojoRepresentation() {
		return componentClassName!=null;
	}

	public void addTuplizer(EntityMode entityMode, String implClassName) {
		if ( tuplizerImpls == null ) {
			tuplizerImpls = new HashMap();
		}
		tuplizerImpls.put( entityMode, implClassName );
	}

	public String getTuplizerImplClassName(EntityMode mode) {
		// todo : remove this once ComponentMetamodel is complete and merged
		if ( tuplizerImpls == null ) {
			return null;
		}
		return ( String ) tuplizerImpls.get( mode );
	}

	public Map getTuplizerMap() {
		if ( tuplizerImpls == null ) {
			return null;
		}
		return java.util.Collections.unmodifiableMap( tuplizerImpls );
	}

	public Property getProperty(String propertyName) throws MappingException {
		Iterator iter = getPropertyIterator();
		while ( iter.hasNext() ) {
			Property prop = (Property) iter.next();
			if ( prop.getName().equals(propertyName) ) {
				return prop;
			}
		}
		throw new MappingException("component property not found: " + propertyName);
	}

	public String getRoleName() {
		return roleName;
	}

	public void setRoleName(String roleName) {
		this.roleName = roleName;
	}

	public String toString() {
		return getClass().getName() + '(' + properties.toString() + ')';
	}

	private IdentifierGenerator builtIdentifierGenerator;

	public IdentifierGenerator createIdentifierGenerator(
			IdentifierGeneratorFactory identifierGeneratorFactory,
			Dialect dialect,
			String defaultCatalog,
			String defaultSchema,
			RootClass rootClass) throws MappingException {
		if ( builtIdentifierGenerator == null ) {
			builtIdentifierGenerator = buildIdentifierGenerator(
					identifierGeneratorFactory,
					dialect,
					defaultCatalog,
					defaultSchema,
					rootClass
			);
		}
		return builtIdentifierGenerator;
	}

	private IdentifierGenerator buildIdentifierGenerator(
			IdentifierGeneratorFactory identifierGeneratorFactory,
			Dialect dialect,
			String defaultCatalog,
			String defaultSchema,
			RootClass rootClass) throws MappingException {
		final boolean hasCustomGenerator = ! DEFAULT_ID_GEN_STRATEGY.equals( getIdentifierGeneratorStrategy() );
		if ( hasCustomGenerator ) {
			return super.createIdentifierGenerator(
					identifierGeneratorFactory, dialect, defaultCatalog, defaultSchema, rootClass
			);
		}

		final Class entityClass = rootClass.getMappedClass();
		final Class attributeDeclarer; // what class is the declarer of the composite pk attributes
		CompositeNestedGeneratedValueGenerator.GenerationContextLocator locator;

		// IMPL NOTE : See the javadoc discussion on CompositeNestedGeneratedValueGenerator wrt the
		//		various scenarios for which we need to account here
		if ( rootClass.getIdentifierMapper() != null ) {
			// we have the @IdClass /  case
			attributeDeclarer = resolveComponentClass();
		}
		else if ( rootClass.getIdentifierProperty() != null ) {
			// we have the "@EmbeddedId" /  case
			attributeDeclarer = resolveComponentClass();
		}
		else {
			// we have the "straight up" embedded (again the hibernate term) component identifier
			attributeDeclarer = entityClass;
		}

		locator = new StandardGenerationContextLocator( rootClass.getEntityName() );
		final CompositeNestedGeneratedValueGenerator generator = new CompositeNestedGeneratedValueGenerator( locator );

		Iterator itr = getPropertyIterator();
		while ( itr.hasNext() ) {
			final Property property = (Property) itr.next();
			if ( property.getValue().isSimpleValue() ) {
				final SimpleValue value = (SimpleValue) property.getValue();

				if ( DEFAULT_ID_GEN_STRATEGY.equals( value.getIdentifierGeneratorStrategy() ) ) {
					// skip any 'assigned' generators, they would have been handled by
					// the StandardGenerationContextLocator
					continue;
				}

				final IdentifierGenerator valueGenerator = value.createIdentifierGenerator(
						identifierGeneratorFactory,
						dialect,
						defaultCatalog,
						defaultSchema,
						rootClass
				);
				generator.addGeneratedValuePlan(
						new ValueGenerationPlan(
								property.getName(),
								valueGenerator,
								injector( property, attributeDeclarer )
						)
				);
			}
		}
		return generator;
	}

	private Setter injector(Property property, Class attributeDeclarer) {
		return property.getPropertyAccessor( attributeDeclarer )
				.getSetter( attributeDeclarer, property.getName() );
	}

	private Class resolveComponentClass() {
		try {
			return getComponentClass();
		}
		catch ( Exception e ) {
			return null;
		}
	}

	public static class StandardGenerationContextLocator
			implements CompositeNestedGeneratedValueGenerator.GenerationContextLocator {
		private final String entityName;

		public StandardGenerationContextLocator(String entityName) {
			this.entityName = entityName;
		}

		public Serializable locateGenerationContext(SessionImplementor session, Object incomingObject) {
			return session.getEntityPersister( entityName, incomingObject ).getIdentifier( incomingObject, session );
		}
	}

	public static class ValueGenerationPlan implements CompositeNestedGeneratedValueGenerator.GenerationPlan {
		private final String propertyName;
		private final IdentifierGenerator subGenerator;
		private final Setter injector;

		public ValueGenerationPlan(
				String propertyName,
				IdentifierGenerator subGenerator,
				Setter injector) {
			this.propertyName = propertyName;
			this.subGenerator = subGenerator;
			this.injector = injector;
		}

		/**
		 * {@inheritDoc}
		 */
		public void execute(SessionImplementor session, Object incomingObject, Object injectionContext) {
			final Object generatedValue = subGenerator.generate( session, incomingObject );
			injector.set( injectionContext, generatedValue, session.getFactory() );
		}

		public void registerPersistentGenerators(Map generatorMap) {
			if ( PersistentIdentifierGenerator.class.isInstance( subGenerator ) ) {
				generatorMap.put( ( (PersistentIdentifierGenerator) subGenerator ).generatorKey(), subGenerator );
			}
		}
	}

}