collectionsecondpass.java

一个Java持久层类库

//$Id: CollectionSecondPass.java 10196 2006-08-03 07:53:27Z [e-mail] $
package org.hibernate.cfg;

import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.MappingException;
import org.hibernate.mapping.Collection;
import org.hibernate.mapping.IndexedCollection;
import org.hibernate.mapping.OneToMany;
import org.hibernate.mapping.Selectable;
import org.hibernate.mapping.Value;

/**
 * Collection second pass
 *
 * @author Emmanuel Bernard
 */
public abstract class CollectionSecondPass implements SecondPass {
	private static Logger log = LoggerFactory.getLogger( CollectionSecondPass.class );
	Mappings mappings;
	Collection collection;
	private Map localInheritedMetas;

	public CollectionSecondPass(Mappings mappings, Collection collection, java.util.Map inheritedMetas) {
		this.collection = collection;
		this.mappings = mappings;
		this.localInheritedMetas = inheritedMetas;
	}

	public CollectionSecondPass(Mappings mappings, Collection collection) {
		this(mappings, collection, Collections.EMPTY_MAP);
	}

	public void doSecondPass(java.util.Map persistentClasses)
			throws MappingException {
		if ( log.isDebugEnabled() )
			log.debug( "Second pass for collection: " + collection.getRole() );

		secondPass( persistentClasses, localInheritedMetas ); // using local since the inheritedMetas at this point is not the correct map since it is always the empty map
		collection.createAllKeys();

		if ( log.isDebugEnabled() ) {
			String msg = "Mapped collection key: " + columns( collection.getKey() );
			if ( collection.isIndexed() )
				msg += ", index: " + columns( ( (IndexedCollection) collection ).getIndex() );
			if ( collection.isOneToMany() ) {
				msg += ", one-to-many: "
					+ ( (OneToMany) collection.getElement() ).getReferencedEntityName();
			}
			else {
				msg += ", element: " + columns( collection.getElement() );
			}
			log.debug( msg );
		}
	}

	abstract public void secondPass(java.util.Map persistentClasses, java.util.Map inheritedMetas)
			throws MappingException;

	private static String columns(Value val) {
		StringBuffer columns = new StringBuffer();
		Iterator iter = val.getColumnIterator();
		while ( iter.hasNext() ) {
			columns.append( ( (Selectable) iter.next() ).getText() );
			if ( iter.hasNext() ) columns.append( ", " );
		}
		return columns.toString();
	}
}