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Hibernate example source code file (AbstractMapComponentNode.java)

This example Hibernate source code file (AbstractMapComponentNode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

abstractmapcomponentnode, ast, collectiontype, collectiontype, fromelement, fromreferencenode, fromreferencenode, hqlsqltokentypes, semanticexception, semanticexception, string, string, type, unsupportedoperationexception, util

The Hibernate AbstractMapComponentNode.java source code

/*
 * Copyright (c) 2009, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.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.internal.util.StringHelper;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.type.CollectionType;
import org.hibernate.type.Type;
import antlr.SemanticException;
import antlr.collections.AST;

/**
 * TODO : javadoc
 *
 * @author Steve Ebersole
 */
public abstract class AbstractMapComponentNode extends FromReferenceNode implements HqlSqlTokenTypes {
	private String[] columns;

	public FromReferenceNode getMapReference() {
		return ( FromReferenceNode ) getFirstChild();
	}

	public String[] getColumns() {
		return columns;
	}

	public void setScalarColumnText(int i) throws SemanticException {
		ColumnHelper.generateScalarColumns( this, getColumns(), i );
	}

	public void resolve(
			boolean generateJoin,
			boolean implicitJoin,
			String classAlias,
			AST parent) throws SemanticException {
		if ( parent != null ) {
			throw attemptedDereference();
		}

		FromReferenceNode mapReference = getMapReference();
		mapReference.resolve( true, true );
		if ( mapReference.getDataType().isCollectionType() ) {
			CollectionType collectionType = (CollectionType) mapReference.getDataType();
			if ( Map.class.isAssignableFrom( collectionType.getReturnedClass() ) ) {
				FromElement sourceFromElement = mapReference.getFromElement();
				setFromElement( sourceFromElement );
				setDataType( resolveType( sourceFromElement.getQueryableCollection() ) );
				this.columns = resolveColumns( sourceFromElement.getQueryableCollection() );
				initText( this.columns );
				setFirstChild( null );
				return;
			}
		}

		throw nonMap();
	}

	private void initText(String[] columns) {
		String text = StringHelper.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 attemptedDereference() {
		return new SemanticException( expressionDescription() + " expression cannot be further de-referenced" );
	}

	protected SemanticException nonMap() {
		return new SemanticException( expressionDescription() + " expression did not reference map property" );
	}

	public void resolveIndex(AST parent) throws SemanticException {
		throw new UnsupportedOperationException( expressionDescription() + " expression cannot be the source for an index operation" );
	}
}

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