/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.query.criteria.internal.path;
import java.io.Serializable;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.persistence.criteria.Join;
import javax.persistence.criteria.Root;
import javax.persistence.metamodel.EntityType;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.CriteriaSubqueryImpl;
import org.hibernate.query.criteria.internal.FromImplementor;
import org.hibernate.query.criteria.internal.PathSource;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
/**
* Hibernate implementation of the JPA {@link Root} contract
*
* @author Steve Ebersole
*/
public class RootImpl<X> extends AbstractFromImpl<X,X> implements Root<X>, Serializable {
private final EntityType<X> entityType;
private final boolean allowJoins;
private final Set<TreatedRoot<? extends X>> treats = new LinkedHashSet<>();
public RootImpl(CriteriaBuilderImpl criteriaBuilder, EntityType<X> entityType) {
this( criteriaBuilder, entityType, true );
}
public RootImpl(CriteriaBuilderImpl criteriaBuilder, EntityType<X> entityType, boolean allowJoins) {
super( criteriaBuilder, entityType.getJavaType() );
this.entityType = entityType;
this.allowJoins = allowJoins;
}
public EntityType<X> getEntityType() {
return entityType;
}
public EntityType<X> getModel() {
return getEntityType();
}
@Override
protected FromImplementor<X, X> createCorrelationDelegate() {
return new RootImpl<X>( criteriaBuilder(), getEntityType() );
}
@Override
public RootImpl<X> correlateTo(CriteriaSubqueryImpl subquery) {
return (RootImpl<X>) super.correlateTo( subquery );
}
@Override
protected boolean canBeJoinSource() {
return allowJoins;
}
@Override
@SuppressWarnings("ThrowableResultOfMethodCallIgnored")
protected RuntimeException illegalJoin() {
return allowJoins ? super.illegalJoin() : new IllegalArgumentException( "UPDATE/DELETE criteria queries cannot define joins" );
}
@Override
@SuppressWarnings("ThrowableResultOfMethodCallIgnored")
protected RuntimeException illegalFetch() {
return allowJoins ? super.illegalFetch() : new IllegalArgumentException( "UPDATE/DELETE criteria queries cannot define fetches" );
}
public String renderTableExpression(RenderingContext renderingContext) {
prepareAlias( renderingContext );
return getModel().getName() + " as " + getAlias();
}
@Override
public String getPathIdentifier() {
return getAlias();
}
@Override
public String render(RenderingContext renderingContext) {
prepareAlias( renderingContext );
return getAlias();
}
@Override
public String renderProjection(RenderingContext renderingContext) {
return render( renderingContext );
}
public Set<TreatedRoot<? extends X>> getTreats() {
return treats;
}
@Override
public <T extends X> RootImpl<T> treatAs(Class<T> treatAsType) {
TreatedRoot<T> treatedRoot = new TreatedRoot<T>( this, treatAsType );
treats.add(treatedRoot);
return treatedRoot;
}
public static class TreatedRoot<T> extends RootImpl<T> {
private final RootImpl<? super T> original;
private final Class<T> treatAsType;
public TreatedRoot(RootImpl<? super T> original, Class<T> treatAsType) {
super(
original.criteriaBuilder(),
original.criteriaBuilder().getEntityManagerFactory().getMetamodel().entity( treatAsType )
);
this.original = original;
this.treatAsType = treatAsType;
}
@Override
public String getAlias() {
return original.getAlias();
}
@Override
public void prepareAlias(RenderingContext renderingContext) {
// NOTE : we call `original#prepareAlias` here and during render
// since in some cases only one or the other will be called
original.prepareAlias( renderingContext );
}
@Override
public String render(RenderingContext renderingContext) {
original.prepareAlias( renderingContext );
return getTreatFragment();
}
protected String getTreatFragment() {
return "treat(" + original.getAlias() + " as " + treatAsType.getName() + ")";
}
@Override
public String getPathIdentifier() {
return getTreatFragment();
}
@Override
protected PathSource getPathSourceForSubPaths() {
return this;
}
}
}