/*
* Copyright 1999-2012 Alibaba Group.
*
* 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.
*/
/**
* (created at 2011-2-9)
*/
package com.alibaba.cobar.parser.ast.fragment.tableref;
import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
/**
* @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
*/
public class NaturalJoin implements TableReference {
private final boolean isOuter;
/**
* make sense only if {@link #isOuter} is true. Eigher <code>LEFT</code> or
* <code>RIGHT</code>
*/
private final boolean isLeft;
private final TableReference leftTableRef;
private final TableReference rightTableRef;
public NaturalJoin(boolean isOuter, boolean isLeft, TableReference leftTableRef, TableReference rightTableRef) {
super();
this.isOuter = isOuter;
this.isLeft = isLeft;
this.leftTableRef = leftTableRef;
this.rightTableRef = rightTableRef;
}
public boolean isOuter() {
return isOuter;
}
public boolean isLeft() {
return isLeft;
}
public TableReference getLeftTableRef() {
return leftTableRef;
}
public TableReference getRightTableRef() {
return rightTableRef;
}
@Override
public Object removeLastConditionElement() {
return null;
}
@Override
public boolean isSingleTable() {
return false;
}
@Override
public int getPrecedence() {
return TableReference.PRECEDENCE_JOIN;
}
@Override
public void accept(SQLASTVisitor visitor) {
visitor.visit(this);
}
}