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The Plasma SDO Module
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/**
 *         PlasmaSDO™ License
 * 
 * This is a community release of PlasmaSDO™, a dual-license 
 * Service Data Object (SDO) 2.1 implementation. 
 * This particular copy of the software is released under the 
 * version 2 of the GNU General Public License. PlasmaSDO™ was developed by 
 * TerraMeta Software, Inc.
 * 
 * Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
 * 
 * General License information can be found below.
 * 
 * This distribution may include materials developed by third
 * parties. For license and attribution notices for these
 * materials, please refer to the documentation that accompanies
 * this distribution (see the "Licenses for Third-Party Components"
 * appendix) or view the online documentation at 
 * .
 *  
 */
package org.plasma.query.visitor;

import org.plasma.query.From;
import org.plasma.query.GroupBy;
import org.plasma.query.OrderBy;
import org.plasma.query.Query;
import org.plasma.query.Where;
import org.plasma.query.model.AbstractProperty;
import org.plasma.query.model.ArithmeticOperator;
import org.plasma.query.model.Clause;
import org.plasma.query.model.Delete;
import org.plasma.query.model.Entity;
import org.plasma.query.model.Expression;
import org.plasma.query.model.GroupOperator;
import org.plasma.query.model.Join;
import org.plasma.query.model.Literal;
import org.plasma.query.model.LogicalOperator;
import org.plasma.query.model.NullLiteral;
import org.plasma.query.model.Property;
import org.plasma.query.model.RelationalOperator;
import org.plasma.query.model.Select;
import org.plasma.query.model.SubqueryOperator;
import org.plasma.query.model.Term;
import org.plasma.query.model.Update;
import org.plasma.query.model.Variable;
import org.plasma.query.model.WildcardOperator;
import org.plasma.query.model.WildcardProperty;


/**
 * Contains "visit" start/end methods called by query traversal 
 * algorithms as various structural nodes
 * are encountered. Helps generalize and separate 
 * the traversal logic from clients only needing 
 * notifications as various specific nodes are traversed.
 */
public interface QueryVisitor 
{
	public VisitorContext getContext();
    
	public void start(Query query);
    public void start(Clause clause);
    public void start(Select select);
    public void start(Update update);
    public void start(Delete delete);
    public void start(From from);
    public void start(Where where);
    public void start(OrderBy orderBy);
    public void start(GroupBy groupBy);
    public void start(Join join);
    public void start(Expression expression);
    public void start(Term term);
    public void start(Property property);
    public void start(WildcardProperty property);
    public void start(AbstractProperty property);
    public void start(Entity entity);
    public void start(GroupOperator operator);
    public void start(RelationalOperator operator);
    public void start(LogicalOperator operator);
    public void start(ArithmeticOperator operator);
    public void start(WildcardOperator operator);
    public void start(SubqueryOperator operator);
    public void start(Literal literal);
    public void start(NullLiteral literal);
    public void start(Variable variable);

    public void end(Query query);
    public void end(Clause clause);
    public void end(Select select);
    public void end(Update update);
    public void end(Delete delete);
    public void end(From from);
    public void end(Where where);
    public void end(OrderBy orderBy);
    public void end(GroupBy groupBy);
    public void end(Join join);
    public void end(Expression expression);
    public void end(Term term);
    public void end(Property property);
    public void end(WildcardProperty property);
    public void end(AbstractProperty property);
    public void end(Entity entity);
    public void end(GroupOperator operator);
    public void end(RelationalOperator operator);
    public void end(LogicalOperator operator);
    public void end(ArithmeticOperator operator);
    public void end(WildcardOperator operator);
    public void end(SubqueryOperator operator);
    public void end(Literal literal);
    public void end(NullLiteral literal);
    public void end(Variable variable);
}