org.hibernate.hql.internal.ast.tree.AbstractMapComponentNode Maven / Gradle / Ivy
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Hibernate's core ORM functionality
/*
* 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 .
*/
package org.hibernate.hql.internal.ast.tree;
import java.util.Map;
import org.hibernate.hql.internal.antlr.HqlSqlTokenTypes;
import org.hibernate.hql.internal.ast.util.ColumnHelper;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.type.CollectionType;
import org.hibernate.type.Type;
import antlr.SemanticException;
import antlr.collections.AST;
/**
* Basic support for KEY, VALUE and ENTRY based "qualified identification variables".
*
* @author Steve Ebersole
*/
public abstract class AbstractMapComponentNode extends FromReferenceNode implements HqlSqlTokenTypes {
private FromElement mapFromElement;
private String[] columns;
public FromReferenceNode getMapReference() {
return (FromReferenceNode) getFirstChild();
}
public String[] getColumns() {
return columns;
}
@Override
public void setScalarColumnText(int i) throws SemanticException {
ColumnHelper.generateScalarColumns( this, getColumns(), i );
}
@Override
public void resolve(
boolean generateJoin,
boolean implicitJoin,
String classAlias,
AST parent,
AST parentPredicate) throws SemanticException {
if ( mapFromElement == null ) {
final FromReferenceNode mapReference = getMapReference();
mapReference.resolve( true, true );
FromElement sourceFromElement = null;
if ( isAliasRef( mapReference ) ) {
final QueryableCollection collectionPersister = mapReference.getFromElement().getQueryableCollection();
if ( Map.class.isAssignableFrom( collectionPersister.getCollectionType().getReturnedClass() ) ) {
sourceFromElement = mapReference.getFromElement();
}
}
else {
if ( mapReference.getDataType().isCollectionType() ) {
final CollectionType collectionType = (CollectionType) mapReference.getDataType();
if ( Map.class.isAssignableFrom( collectionType.getReturnedClass() ) ) {
sourceFromElement = mapReference.getFromElement();
}
}
}
if ( sourceFromElement == null ) {
throw nonMap();
}
mapFromElement = sourceFromElement;
}
setFromElement( mapFromElement );
setDataType( resolveType( mapFromElement.getQueryableCollection() ) );
this.columns = resolveColumns( mapFromElement.getQueryableCollection() );
initText( this.columns );
setFirstChild( null );
}
public FromElement getMapFromElement() {
return mapFromElement;
}
private boolean isAliasRef(FromReferenceNode mapReference) {
return ALIAS_REF == mapReference.getType();
}
private void initText(String[] columns) {
String text = String.join( ", ", columns );
if ( columns.length > 1 && getWalker().isComparativeExpressionClause() ) {
text = "(" + text + ")";
}
setText( text );
}
protected abstract String expressionDescription();
protected abstract String[] resolveColumns(QueryableCollection collectionPersister);
protected abstract Type resolveType(QueryableCollection collectionPersister);
protected SemanticException nonMap() {
return new SemanticException( expressionDescription() + " expression did not reference map property" );
}
@Override
public void resolveIndex(AST parent) throws SemanticException {
throw new UnsupportedOperationException( expressionDescription() + " expression cannot be the source for an index operation" );
}
protected MapKeyEntityFromElement findOrAddMapKeyEntityFromElement(QueryableCollection collectionPersister) {
if ( !collectionPersister.getIndexType().isEntityType() ) {
return null;
}
for ( FromElement destination : getFromElement().getDestinations() ) {
if ( destination instanceof MapKeyEntityFromElement ) {
return (MapKeyEntityFromElement) destination;
}
}
return MapKeyEntityFromElement.buildKeyJoin( getFromElement() );
}
}