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/*******************************************************************************
* Copyright (c) 2006, 2008 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.internal.context;
import java.util.Iterator;
import org.eclipse.jpt.core.MappingKeys;
import org.eclipse.jpt.core.context.ColumnMapping;
import org.eclipse.jpt.core.context.Embeddable;
import org.eclipse.jpt.core.context.Entity;
import org.eclipse.jpt.core.context.JoinColumn;
import org.eclipse.jpt.core.context.PersistentAttribute;
import org.eclipse.jpt.core.context.PersistentType;
import org.eclipse.jpt.core.context.RelationshipMapping;
import org.eclipse.jpt.core.context.java.JavaPersistentAttribute;
public class MappingTools
{
/**
* Default join table name from the JPA spec:
* The concatenated names of the two associated primary
* entity tables, separated by a underscore.
*
* [owning table name]_[target table name]
*/
public static String buildJoinTableDefaultName(RelationshipMapping relationshipMapping) {
if (!relationshipMapping.isRelationshipOwner()) {
return null;
}
String owningTableName = relationshipMapping.getTypeMapping().getTableName();
if (owningTableName == null) {
return null;
}
Entity targetEntity = relationshipMapping.getResolvedTargetEntity();
if (targetEntity == null) {
return null;
}
String targetTableName = targetEntity.getTableName();
if (targetTableName == null) {
return null;
}
return owningTableName + '_' + targetTableName;
}
/**
* return the join column's default name;
* which is typically <attribute name>_<referenced column name>
* but, if we don't have an attribute name (e.g. in a unidirectional
* OneToMany or ManyToMany) is
* <target entity name>_<referenced column name>
*/
// <attribute name>_<referenced column name>
// or
// <target entity name>_<referenced column name>
public static String buildJoinColumnDefaultName(JoinColumn joinColumn) {
if (joinColumn.getOwner().joinColumnsSize() != 1) {
return null;
}
String prefix = joinColumn.getOwner().getAttributeName();
if (prefix == null) {
prefix = targetEntityName(joinColumn);
}
if (prefix == null) {
return null;
}
// TODO not sure which of these is correct...
// (the spec implies that the referenced column is always the
// primary key column of the target entity)
// String targetColumn = this.targetPrimaryKeyColumnName();
String targetColumn = joinColumn.getReferencedColumnName();
if (targetColumn == null) {
return null;
}
return prefix + '_' + targetColumn;
}
/**
* return the name of the target entity
*/
protected static String targetEntityName(JoinColumn joinColumn) {
Entity targetEntity = joinColumn.getOwner().getTargetEntity();
return (targetEntity == null) ? null : targetEntity.getName();
}
public static String buildJoinColumnDefaultReferencedColumnName(JoinColumn joinColumn) {
if (joinColumn.getOwner().joinColumnsSize() != 1) {
return null;
}
return targetPrimaryKeyColumnName(joinColumn);
}
/**
* return the name of the single primary key column of the target entity
*/
protected static String targetPrimaryKeyColumnName(JoinColumn joinColumn) {
Entity targetEntity = joinColumn.getOwner().getTargetEntity();
return (targetEntity == null) ? null : targetEntity.getPrimaryKeyColumnName();
}
public static Embeddable getEmbeddableFor(JavaPersistentAttribute persistentAttribute) {
String qualifiedTypeName = persistentAttribute.getResourcePersistentAttribute().getQualifiedTypeName();
if (qualifiedTypeName == null) {
return null;
}
PersistentType persistentType = persistentAttribute.getPersistenceUnit().getPersistentType(qualifiedTypeName);
if (persistentType != null) {
if (persistentType.getMappingKey() == MappingKeys.EMBEDDABLE_TYPE_MAPPING_KEY) {
return (Embeddable) persistentType.getMapping();
}
}
return null;
}
public static ColumnMapping getColumnMapping(String attributeName, Embeddable embeddable) {
if (attributeName == null || embeddable == null) {
return null;
}
for (Iterator<PersistentAttribute> stream = embeddable.getPersistentType().allAttributes(); stream.hasNext();) {
PersistentAttribute persAttribute = stream.next();
if (attributeName.equals(persAttribute.getName())) {
if (persAttribute.getMapping() instanceof ColumnMapping) {
return (ColumnMapping) persAttribute.getMapping();
}
}
}
return null;
}
}
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