org.hibernate.sql.JoinFragment#LEFT_OUTER_JOIN源码实例Demo

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

/**
 * Use an inner join if it is a non-null association and this
 * is the "first" join in a series
 */
protected int getJoinType(boolean nullable, int currentDepth) {
	//TODO: this is too conservative; if all preceding joins were 
	//      also inner joins, we could use an inner join here
	return !nullable && currentDepth==0 ? 
				JoinFragment.INNER_JOIN : 
				JoinFragment.LEFT_OUTER_JOIN;
}
 

/**
 * Count the number of instances of Joinable which are actually
 * also instances of PersistentCollection which are being fetched
 * by outer join
 */
protected static final int countCollectionPersisters(List associations)
throws MappingException {
	int result = 0;
	Iterator iter = associations.iterator();
	while ( iter.hasNext() ) {
		OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
		if ( oj.getJoinType()==JoinFragment.LEFT_OUTER_JOIN && oj.getJoinable().isCollection() ) {
			result++;
		}
	}
	return result;
}
 

/**
 * We can use an inner join for first many-to-many association
 */
protected int getJoinType(
		AssociationType type, 
		FetchMode config, 
		String path, 
		Set visitedAssociations,
		String lhsTable,
		String[] lhsColumns,
		boolean nullable,
		int currentDepth)
throws MappingException {

	int joinType = super.getJoinType(
			type, 
			config, 
			path, 
			lhsTable, 
			lhsColumns, 
			nullable, 
			currentDepth,
			null
		);
	//we can use an inner join for the many-to-many
	if ( joinType==JoinFragment.LEFT_OUTER_JOIN && "".equals(path) ) {
		joinType=JoinFragment.INNER_JOIN;
	}
	return joinType;
}
 

/**
 * Translates an AST join type (i.e., the token type) into a JoinFragment.XXX join type.
 *
 * @param astJoinType The AST join type (from HqlSqlTokenTypes or SqlTokenTypes)
 * @return a JoinFragment.XXX join type.
 * @see JoinFragment
 * @see SqlTokenTypes
 */
public static int toHibernateJoinType(int astJoinType) {
	switch ( astJoinType ) {
		case LEFT_OUTER:
			return JoinFragment.LEFT_OUTER_JOIN;
		case INNER:
			return JoinFragment.INNER_JOIN;
		case RIGHT_OUTER:
			return JoinFragment.RIGHT_OUTER_JOIN;
		default:
			throw new AssertionFailure( "undefined join type " + astJoinType );
	}
}
 

protected void initPersisters(final List associations, final LockMode lockMode) throws MappingException {
	
	final int joins = countEntityPersisters(associations);
	final int collections = countCollectionPersisters(associations);

	collectionOwners = collections==0 ? null : new int[collections];
	collectionPersisters = collections==0 ? null : new CollectionPersister[collections];
	collectionSuffixes = BasicLoader.generateSuffixes( joins + 1, collections );

	persisters = new Loadable[joins];
	aliases = new String[joins];
	owners = new int[joins];
	ownerAssociationTypes = new EntityType[joins];
	lockModeArray = ArrayHelper.fillArray(lockMode, joins);
	
	int i=0;
	int j=0;
	Iterator iter = associations.iterator();
	while ( iter.hasNext() ) {
		final OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
		if ( !oj.isCollection() ) {
			
			persisters[i] = (Loadable) oj.getJoinable();
			aliases[i] = oj.getRHSAlias();
			owners[i] = oj.getOwner(associations);
			ownerAssociationTypes[i] = (EntityType) oj.getJoinableType();
			i++;
			
		}
		else {
			
			QueryableCollection collPersister = (QueryableCollection) oj.getJoinable();
			if ( oj.getJoinType()==JoinFragment.LEFT_OUTER_JOIN ) {
				//it must be a collection fetch
				collectionPersisters[j] = collPersister;
				collectionOwners[j] = oj.getOwner(associations);
				j++;
			}

			if ( collPersister.isOneToMany() ) {
				persisters[i] = (Loadable) collPersister.getElementPersister();
				aliases[i] = oj.getRHSAlias();
				i++;
			}
		}
	}

	if ( ArrayHelper.isAllNegative(owners) ) owners = null;
	if ( collectionOwners!=null && ArrayHelper.isAllNegative(collectionOwners) ) {
		collectionOwners = null;
	}
}
 

/**
 * Generate a select list of columns containing all properties of the entity classes
 */
protected final String selectString(List associations)
throws MappingException {

	if ( associations.size()==0 ) {
		return "";
	}
	else {
		StringBuffer buf = new StringBuffer( associations.size() * 100 )
			.append(", ");
		int entityAliasCount=0;
		int collectionAliasCount=0;
		for ( int i=0; i<associations.size(); i++ ) {
			OuterJoinableAssociation join = (OuterJoinableAssociation) associations.get(i);
			OuterJoinableAssociation next = (i == associations.size() - 1)
			        ? null
			        : ( OuterJoinableAssociation ) associations.get( i + 1 );
			final Joinable joinable = join.getJoinable();
			final String entitySuffix = ( suffixes == null || entityAliasCount >= suffixes.length )
			        ? null
			        : suffixes[entityAliasCount];
			final String collectionSuffix = ( collectionSuffixes == null || collectionAliasCount >= collectionSuffixes.length )
			        ? null
			        : collectionSuffixes[collectionAliasCount];
			final String selectFragment = joinable.selectFragment(
					next == null ? null : next.getJoinable(),
					next == null ? null : next.getRHSAlias(),
					join.getRHSAlias(),
					entitySuffix,
			        collectionSuffix,
					join.getJoinType()==JoinFragment.LEFT_OUTER_JOIN
			);
			buf.append(selectFragment);
			if ( joinable.consumesEntityAlias() ) entityAliasCount++;
			if ( joinable.consumesCollectionAlias() && join.getJoinType()==JoinFragment.LEFT_OUTER_JOIN ) collectionAliasCount++;
			if (
				i<associations.size()-1 &&
				selectFragment.trim().length()>0
			) {
				buf.append(", ");
			}
		}
		return buf.toString();
	}
}