/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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 com.querydsl.sql;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
import com.querydsl.core.types.Ops;
public class DB2TemplatesTest extends AbstractSQLTemplatesTest {
@Override
protected SQLTemplates createTemplates() {
return new DB2Templates();
}
@Test
public void precedence() {
// Expressions within parentheses are evaluated first. When the order of evaluation is not
// specified by parentheses, prefix operators are applied before multiplication and division,
// and multiplication, division, and concatenation are applied before addition and subtraction.
// Operators at the same precedence level are applied from left to right.
int p1 = getPrecedence(Ops.NEGATE);
int p2 = getPrecedence(Ops.MULT, Ops.DIV, Ops.CONCAT);
int p3 = getPrecedence(Ops.ADD, Ops.SUB);
int p4 = getPrecedence(Ops.EQ, Ops.NE, Ops.LT, Ops.GT, Ops.LOE, Ops.GOE);
int p5 = getPrecedence(Ops.IS_NULL, Ops.IS_NOT_NULL, Ops.LIKE, Ops.LIKE_ESCAPE, Ops.BETWEEN, Ops.IN, Ops.NOT_IN, Ops.EXISTS);
int p6 = getPrecedence(Ops.NOT);
int p7 = getPrecedence(Ops.AND);
int p8 = getPrecedence(Ops.OR);
assertTrue(p1 < p2);
assertTrue(p2 < p3);
assertTrue(p3 < p4);
assertTrue(p4 < p5);
assertTrue(p5 < p6);
assertTrue(p6 < p7);
assertTrue(p7 < p8);
}
}