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Hibernate example source code file (AbstractEntityJoinWalker.java)

This example Hibernate source code file (AbstractEntityJoinWalker.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

abstractentityjoinwalker, abstractentityjoinwalker, arraylist, loadable, loadqueryinfluencers, lockoptions, lockoptions, mappingexception, mappingexception, outerjoinloadable, select, sessionfactoryimplementor, string, string, util

The Hibernate AbstractEntityJoinWalker.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, 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.loader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.FetchMode;
import org.hibernate.LockOptions;
import org.hibernate.MappingException;
import org.hibernate.engine.spi.CascadeStyle;
import org.hibernate.engine.spi.LoadQueryInfluencers;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.profile.Fetch;
import org.hibernate.engine.profile.FetchProfile;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.sql.JoinFragment;
import org.hibernate.sql.Select;
import org.hibernate.type.AssociationType;

/**
 * Abstract walker for walkers which begin at an entity (criteria
 * queries and entity loaders).
 *
 * @author Gavin King
 */
public abstract class AbstractEntityJoinWalker extends JoinWalker {

	private final OuterJoinLoadable persister;
	private final String alias;

	public AbstractEntityJoinWalker(
			OuterJoinLoadable persister,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers) {
		this( persister, factory, loadQueryInfluencers, null );
	}

	public AbstractEntityJoinWalker(
			OuterJoinLoadable persister,
			SessionFactoryImplementor factory,
			LoadQueryInfluencers loadQueryInfluencers,
			String alias) {
		super( factory, loadQueryInfluencers );
		this.persister = persister;
		this.alias = ( alias == null ) ? generateRootAlias( persister.getEntityName() ) : alias;
	}

	protected final void initAll(
			final String whereString,
			final String orderByString,
			final LockOptions lockOptions) throws MappingException {
		initAll( whereString, orderByString, lockOptions, AssociationInitCallback.NO_CALLBACK );
	}

	protected final void initAll(
			final String whereString,
			final String orderByString,
			final LockOptions lockOptions,
			final AssociationInitCallback callback) throws MappingException {
		walkEntityTree( persister, getAlias() );
		List allAssociations = new ArrayList();
		allAssociations.addAll( associations );
		allAssociations.add( OuterJoinableAssociation.createRoot( persister.getEntityType(), alias, getFactory() ) );
		initPersisters( allAssociations, lockOptions, callback );
		initStatementString( whereString, orderByString, lockOptions );
	}

	protected final void initProjection(
			final String projectionString,
			final String whereString,
			final String orderByString,
			final String groupByString,
			final LockOptions lockOptions) throws MappingException {
		walkEntityTree( persister, getAlias() );
		persisters = new Loadable[0];
		initStatementString(projectionString, whereString, orderByString, groupByString, lockOptions);
	}

	private void initStatementString(
			final String condition,
			final String orderBy,
			final LockOptions lockOptions) throws MappingException {
		initStatementString(null, condition, orderBy, "", lockOptions);
	}

	private void initStatementString(
			final String projection,
			final String condition,
			final String orderBy,
			final String groupBy,
			final LockOptions lockOptions) throws MappingException {

		final int joins = countEntityPersisters( associations );
		suffixes = BasicLoader.generateSuffixes( joins + 1 );

		JoinFragment ojf = mergeOuterJoins( associations );

		Select select = new Select( getDialect() )
				.setLockOptions( lockOptions )
				.setSelectClause(
						projection == null ?
								persister.selectFragment( alias, suffixes[joins] ) + selectString( associations ) :
								projection
				)
				.setFromClause(
						getDialect().appendLockHint( lockOptions.getLockMode(), persister.fromTableFragment( alias ) ) +
								persister.fromJoinFragment( alias, true, true )
				)
				.setWhereClause( condition )
				.setOuterJoins(
						ojf.toFromFragmentString(),
						ojf.toWhereFragmentString() + getWhereFragment()
				)
				.setOrderByClause( orderBy( associations, orderBy ) )
				.setGroupByClause( groupBy );

		if ( getFactory().getSettings().isCommentsEnabled() ) {
			select.setComment( getComment() );
		}
		sql = select.toStatementString();
	}

	protected String getWhereFragment() throws MappingException {
		// here we do not bother with the discriminator.
		return persister.whereJoinFragment(alias, true, true);
	}

	/**
	 * The superclass deliberately excludes collections
	 */
	protected boolean isJoinedFetchEnabled(AssociationType type, FetchMode config, CascadeStyle cascadeStyle) {
		return isJoinedFetchEnabledInMapping( config, type );
	}

	protected final boolean isJoinFetchEnabledByProfile(OuterJoinLoadable persister, PropertyPath path, int propertyNumber) {
		if ( !getLoadQueryInfluencers().hasEnabledFetchProfiles() ) {
			// perf optimization
			return false;
		}

		// ugh, this stuff has to be made easier...
		final String fullPath = path.getFullPath();
		String rootPropertyName = persister.getSubclassPropertyName( propertyNumber );
		int pos = fullPath.lastIndexOf( rootPropertyName );
		String relativePropertyPath = pos >= 0
				? fullPath.substring( pos )
				: rootPropertyName;
		String fetchRole = persister.getEntityName() + "." + relativePropertyPath;

		Iterator profiles = getLoadQueryInfluencers().getEnabledFetchProfileNames().iterator();
		while ( profiles.hasNext() ) {
			final String profileName = ( String ) profiles.next();
			final FetchProfile profile = getFactory().getFetchProfile( profileName );
			final Fetch fetch = profile.getFetchByRole( fetchRole );
			if ( fetch != null && Fetch.Style.JOIN == fetch.getStyle() ) {
				return true;
			}
		}
		return false;
	}

	public abstract String getComment();

	protected final Loadable getPersister() {
		return persister;
	}

	protected final String getAlias() {
		return alias;
	}

	public String toString() {
		return getClass().getName() + '(' + getPersister().getEntityName() + ')';
	}
}

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