DefaultQueryVisitor.java

/*
 * Copyright (c) 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Florent Guillaume
 */

package org.eclipse.ecr.core.query.sql.model;

/**
 * A default implementation of a visitor that visits depth-first in standard
 * expression order.
 *
 * @author Florent Guillaume
 */
public class DefaultQueryVisitor implements IVisitor {

    private static final long serialVersionUID = 1L;

    @Override
    public void visitQuery(SQLQuery node) {
        node.select.accept(this);
        node.from.accept(this);
        if (node.where != null) {
            node.where.accept(this);
        }
        if (node.orderBy != null) {
            node.orderBy.accept(this);
        }
        if (node.groupBy != null) {
            node.groupBy.accept(this);
        }
        if (node.having != null) {
            node.having.accept(this);
        }
    }

    @Override
    public void visitSelectClause(SelectClause node) {
        SelectList elements = node.elements;
        for (int i = 0; i < elements.size(); i++) {
            elements.get(i).accept(this);
        }
    }

    @Override
    public void visitFromClause(FromClause node) {
    }

    @Override
    public void visitWhereClause(WhereClause node) {
        node.predicate.accept(this);
    }

    @Override
    public void visitGroupByClause(GroupByClause node) {
    }

    @Override
    public void visitHavingClause(HavingClause node) {
        if (node.predicate != null) {
            node.predicate.accept(this);
        }
    }

    @Override
    public void visitOrderByClause(OrderByClause node) {
        node.elements.accept(this);
    }

    @Override
    public void visitOrderByList(OrderByList node) {
        for (OrderByExpr aNode : node) {
            aNode.accept(this);
        }
    }

    @Override
    public void visitOrderByExpr(OrderByExpr node) {
        node.reference.accept(this);
    }

    @Override
    public void visitExpression(Expression node) {
        if (node.rvalue == null) {
            if (node.isSuffix()) {
                // IS NULL, IS NOT NULL
                node.lvalue.accept(this);
                node.operator.accept(this);
            } else {
                // NOT
                node.operator.accept(this);
                node.lvalue.accept(this);
            }
        } else {
            node.lvalue.accept(this);
            node.operator.accept(this);
            node.rvalue.accept(this);
        }
    }

    @Override
    public void visitMultiExpression(MultiExpression node) {
        for (Operand operand : node.values) {
            operand.accept(this);
        }
    }

    @Override
    public void visitOperator(Operator node) {
    }

    @Override
    public void visitReference(Reference node) {
    }

    @Override
    public void visitReferenceList(ReferenceList node) {
        for (Reference reference : node) {
            reference.accept(this);
        }
    }

    @Override
    public void visitLiteral(Literal node) {
    }

    @Override
    public void visitLiteralList(LiteralList node) {
        for (Literal literal : node) {
            literal.accept(this);
        }
    }

    @Override
    public void visitDateLiteral(DateLiteral node) {
        visitLiteral(node);
    }

    @Override
    public void visitStringLiteral(StringLiteral node) {
        visitLiteral(node);
    }

    @Override
    public void visitDoubleLiteral(DoubleLiteral node) {
        visitLiteral(node);
    }

    @Override
    public void visitIntegerLiteral(IntegerLiteral node) {
        visitLiteral(node);
    }

    @Override
    public void visitFunction(Function node) {
        for (Operand operand : node.args) {
            operand.accept(this);
        }
    }

    @Override
    public void visitOperandList(OperandList node) {
        for (Operand operand : node) {
            operand.accept(this);
        }
    }

}