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/**
* <copyright>
*
* Copyright (c) 2005, 2006 Springsite BV (The Netherlands) and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Martin Taal
* Davide Marchignoli
* </copyright>
*
* $Id: OneToOneMapper.java,v 1.4 2006/11/15 17:17:52 mtaal Exp $
*/
package org.eclipse.emf.teneo.hibernate.mapper;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.teneo.annotations.pamodel.PAnnotatedEReference;
import org.eclipse.emf.teneo.annotations.pamodel.PAnnotatedEStructuralFeature;
import org.eclipse.emf.teneo.annotations.pannotation.OneToOne;
import org.eclipse.emf.teneo.annotations.pannotation.PannotationPackage;
import org.eclipse.emf.teneo.simpledom.Element;
/**
* Maps a {@link OneToOne} element to its {@link MappingContext}.
* <p>
* Assumes that the given {@link PAnnotatedEStructuralFeature} is a normal OneToOne, i.e.
* <ul>
* <li>it is a {@link PAnnotatedEReference};
* <li>it has a {@link OneToOne} annotation;
* <li>each attribute on the {@link OneToOne} annotation is set possibly except for {@link OneToOne#getMappedBy()};
* <li>TODO requirements on JoinColumns/PrimaryKeyJoinColumn
* </ul>
*
* @author <a href="mailto:marchign at elver.org">Davide Marchignoli</a>
* @author <a href="mailto:mtaal at elver.org">Martin Taal</a>
*/
class OneToOneMapper extends AbstractAssociationMapper {
private static final Log log = LogFactory.getLog(OneToOneMapper.class);
public OneToOneMapper(MappingContext hbmContext) {
super(hbmContext);
}
/** Process the one-to-one */
public void process(PAnnotatedEReference paReference) {
if (getOtherSide(paReference) == null
|| paReference.getOneToOne().eIsSet(PannotationPackage.eINSTANCE.getOneToOne_MappedBy())) {
if (!paReference.getPrimaryKeyJoinColumns().isEmpty()) {
createOneToOne(paReference);
} else {
createManyToOne(paReference);
}
} else {
createOneToOne(paReference);
}
}
/** Create hibernate many-to-one mapping */
private void createManyToOne(PAnnotatedEReference paReference) {
log.debug("Generating many to one mapping for onetoone" + paReference);
final OneToOne oto = paReference.getOneToOne();
final EReference eref = paReference.getAnnotatedEReference();
String specifiedName = oto.getTargetEntity();
final EClass referedTo = eref.getEReferenceType();
final boolean isEasyEMFGenerated = getHbmContext().isEasyEMFGenerated(referedTo);
if (isEasyEMFGenerated) {
specifiedName = getHbmContext().getImpl(referedTo).getName();
}
final Element associationElement = addManyToOne(paReference, (specifiedName != null ? specifiedName
: getHbmContext().getEntityName(eref.getEReferenceType())), !isEasyEMFGenerated);
addCascadesForSingle(associationElement, oto.getCascade());
if (isEObject(specifiedName)) {
addColumns(associationElement, eref.getName(), getAnyTypeColumns(eref.getName(), true), true, false);
} else {
if (getHbmContext().isEasyEMFGenerated(eref.getEContainingClass())) {
addFetchType(associationElement, oto.getFetch());
} else {
associationElement.addAttribute("lazy", "false");
}
final List joinColumns = getJoinColumns(paReference);
final boolean forceNullable = (oto.isOptional() || getHbmContext().isCurrentElementFeatureMap());
addJoinColumns(associationElement, joinColumns, forceNullable);
associationElement.addAttribute("unique", "true");
}
}
/** Create hibernate one-to-one mapping */
private void createOneToOne(PAnnotatedEReference paReference) {
if (log.isDebugEnabled())
log.debug("Generating one to one bidirectional inverse mapping for " + paReference);
final OneToOne oto = paReference.getOneToOne();
String targetName = oto.getTargetEntity();
if (targetName == null) {
targetName = getHbmContext().getEntityName(paReference.getAnnotatedEReference().getEReferenceType());
}
final EClass referedTo = paReference.getAnnotatedEReference().getEReferenceType();
final boolean isEasyEMFGenerated = getHbmContext().isEasyEMFGenerated(referedTo);
if (isEasyEMFGenerated) {
targetName = getHbmContext().getImpl(referedTo).getName();
}
final EReference eref = paReference.getAnnotatedEReference();
final EReference otherSide = eref.getEOpposite();
final Element associationElement = addOneToOne(getHbmContext().getPropertyName(eref), targetName,
!isEasyEMFGenerated);
addCascadesForSingle(associationElement, oto.getCascade());
// add the other-side
if (otherSide != null) {
associationElement.addAttribute("property-ref", getHbmContext().getPropertyName(otherSide));
}
addFetchType(associationElement, oto.getFetch());
if (paReference.getPrimaryKeyJoinColumns().size() > 0) {
associationElement.addAttribute("constrained", "true");
}
}
/**
* @return
*/
private Element addOneToOne(String assocName, String targetEntity, boolean isEntity) {
if (isEntity) {
return getHbmContext().getCurrent().addElement("one-to-one").addAttribute("name", assocName).addAttribute(
"entity-name", targetEntity);
} else {
return getHbmContext().getCurrent().addElement("one-to-one").addAttribute("name", assocName).addAttribute(
"class", targetEntity);
}
}
}
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