CayenneDataObjectEncoder.java

gistfile1.txt

package is.landsvirkjun.admin.util;

import java.util.HashMap;
import java.util.Map;

import org.apache.cayenne.CayenneDataObject;
import org.apache.cayenne.DataObjectUtils;
import org.apache.cayenne.ObjectContext;
import org.apache.tapestry5.ValueEncoder;

public class CayenneDataObjectEncoder implements ValueEncoder<CayenneDataObject> {

	private static Map<Integer,ObjectContext> _dcs = new HashMap<Integer,ObjectContext>();

	private static final String DIVIDER = "-";

	public String toClient( CayenneDataObject cayenneDataObject ) {
		ObjectContext oc = cayenneDataObject.getObjectContext();
		Integer hash = null;

		if( oc != null ) {
			hash = oc.hashCode();
		}
		else {
			hash = -1;
		}

		_dcs.put( hash, oc );
		String entityName = cayenneDataObject.getObjEntity().getName();
		Integer id = DataObjectUtils.intPKForObject( cayenneDataObject );
		String identifier = hash + DIVIDER + entityName + DIVIDER + id;
		return identifier;
	}

	public CayenneDataObject toValue( String string ) {
		String[] parts = string.split( DIVIDER );
		ObjectContext oc = _dcs.get( Integer.valueOf( parts[0] ) );
		String entityName = parts[1];
		Integer id = Integer.valueOf( parts[2] );
		return (CayenneDataObject)DataObjectUtils.objectForPK( oc, entityName, id );
	}
}