/*
 * Copyright (c) 2011-2015 EPFL DATA Laboratory
 * Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
 *
 * All rights reserved.
 *
 * 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 ch.epfl.data.squall.api.sql.visitors.squall;

import java.util.ArrayList;
import java.util.List;

import ch.epfl.data.squall.expressions.ValueExpression;
import ch.epfl.data.squall.predicates.AndPredicate;
import ch.epfl.data.squall.predicates.BetweenPredicate;
import ch.epfl.data.squall.predicates.ComparisonPredicate;
import ch.epfl.data.squall.predicates.LikePredicate;
import ch.epfl.data.squall.predicates.OrPredicate;
import ch.epfl.data.squall.predicates.Predicate;
import ch.epfl.data.squall.predicates.booleanPrimitive;
import ch.epfl.data.squall.visitors.PredicateVisitor;

public class VECollectPredVisitor implements PredicateVisitor {
    private final List<ValueExpression> _veList = new ArrayList<ValueExpression>();

    public List<ValueExpression> getExpressions() {
	return _veList;
    }

    @Override
    public void visit(AndPredicate and) {
	visit(and.getInnerPredicates());
    }

    @Override
    public void visit(BetweenPredicate between) {
	visit(between.getInnerPredicates());
    }

    @Override
    public void visit(booleanPrimitive bool) {

    }

    @Override
    public void visit(ComparisonPredicate comparison) {
	_veList.addAll(comparison.getExpressions());
    }

    @Override
    public void visit(LikePredicate like) {
	_veList.addAll(like.getExpressions());
    }

    private void visit(List<Predicate> predList) {
	for (final Predicate pred : predList)
	    pred.accept(this);
    }

    @Override
    public void visit(OrPredicate or) {
	visit(or.getInnerPredicates());
    }

}