/**
* ***************************************************************
* JADE - Java Agent DEvelopment Framework is a framework to develop
* multi-agent systems in compliance with the FIPA specifications.
* Copyright (C) 2000 CSELT S.p.A.
*
* GNU Lesser General Public License
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation,
* version 2.1 of the License.
*
* This library 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 library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* **************************************************************
*/
package jade.content.schema;
import jade.content.abs.*;
import jade.content.onto.OntologyException;
/**
* This class represents the schema of a generic content element in
* an ontology.
* @author Federico Bergenti - Universita` di Parma
*/
public class ContentElementSchema extends ObjectSchemaImpl {
public static final String BASE_NAME = "ContentElement";
private static ContentElementSchema baseSchema = new ContentElementSchema();
/**
* Construct a schema that vinculates an entity to be a generic
* content element
*/
private ContentElementSchema() {
super(BASE_NAME);
}
/**
* Creates a <code>ContentElementSchema</code> with a given type-name.
* @param typeName The name of this <code>ContentElementSchema</code>.
*/
protected ContentElementSchema(String typeName) {
super(typeName);
}
/**
* Retrieve the generic base schema for all content elements.
* @return the generic base schema for all content elements.
*/
public static ObjectSchema getBaseSchema() {
return baseSchema;
}
/**
* Creates an Abstract descriptor to hold a content element of
* the proper type.
*/
public AbsObject newInstance() throws OntologyException {
throw new OntologyException("AbsContentElement cannot be instantieted");
}
/**
Return true if
- s is the base schema for the XXXSchema class this schema is
an instance of (e.g. s is ConceptSchema.getBaseSchema() and this
schema is an instance of ConceptSchema)
- s is the base schema for a super-class of the XXXSchema class
this schema is an instance of (e.g. s is TermSchema.getBaseSchema()
and this schema is an instance of ConceptSchema)
*/
protected boolean descendsFrom(ObjectSchema s) {
if (s != null) {
if (s.equals(getBaseSchema())) {
return true;
}
return super.descendsFrom(s);
}
else {
return false;
}
}
}