/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.topicmaps.query.parser;
import java.util.Collection;
import java.util.List;
/**
* INTERNAL: Common superclass for or clauses and other kinds of clauses.
*/
public abstract class AbstractClause {
/**
* INTERNAL: Returns all the variables bound by this clause when it
* is satisfied.
*/
public abstract Collection getAllVariables();
/**
* INTERNAL: Returns all the literals used by this clause as
* parameters. (Literals in the second half of pair arguments are
* ignored.)
*/
public abstract Collection getAllLiterals();
/**
* INTERNAL: Returns the arguments of this clause. For OrClause this
* is the list of all arguments to all the subclauses in the OrClause.
* Likewise for NotClause.
*/
public abstract List getArguments();
}