/*
* Copyright 2013 Google Inc. 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 com.google.errorprone.matchers;
import static org.junit.Assert.assertTrue;
import com.google.errorprone.Scanner;
import com.google.errorprone.VisitorState;
import com.sun.source.tree.CompoundAssignmentTree;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.Tree.Kind;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.HashSet;
import java.util.Set;
/**
* @author adgar@google.com (Mike Edgar)
*/
@RunWith(JUnit4.class)
public class CompoundAssignmentTest extends CompilerBasedAbstractTest {
@Test(expected = IllegalArgumentException.class)
public void cannotConstructWithInvalidKind() {
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS_ASSIGNMENT);
operators.add(Kind.IF);
assertCompiles(compoundAssignmentMatches(true, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>anything(),
Matchers.<ExpressionTree>anything())));
}
@Test(expected = IllegalArgumentException.class)
public void cannotConstructWithBinaryOperator() {
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS);
operators.add(Kind.PLUS_ASSIGNMENT);
assertCompiles(compoundAssignmentMatches(true, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>anything(),
Matchers.<ExpressionTree>anything())));
}
@Test
public void shouldMatch() {
writeFile("A.java",
"public class A {",
" public void getHash(int a, long b) {",
" long c = a;",
" c += b;",
" }",
"}"
);
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS_ASSIGNMENT);
operators.add(Kind.LEFT_SHIFT_ASSIGNMENT);
assertCompiles(compoundAssignmentMatches(true, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>anything(),
Matchers.<ExpressionTree>anything())));
}
@Test
public void shouldNotMatchWhenOperatorDiffers() {
writeFile("A.java",
"public class A {",
" public void getHash(int a, long b) {",
" long c = a;",
" c -= b;",
" }",
"}"
);
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS_ASSIGNMENT);
assertCompiles(compoundAssignmentMatches(false, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>anything(),
Matchers.<ExpressionTree>anything())));
}
@Test
public void shouldNotMatchWhenLeftOperandMatcherFails() {
writeFile("A.java",
"public class A {",
" public void getHash(int a, long b) {",
" long c = a;",
" c += b;",
" }",
"}"
);
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS_ASSIGNMENT);
assertCompiles(compoundAssignmentMatches(false, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>isArrayType(),
Matchers.<ExpressionTree>anything())));
}
@Test
public void shouldNotMatchWhenRightOperandMatcherFails() {
writeFile("A.java",
"public class A {",
" public void getHash(int a, long b) {",
" long c = a;",
" c += b;",
" }",
"}"
);
Set<Kind> operators = new HashSet<Kind>();
operators.add(Kind.PLUS_ASSIGNMENT);
assertCompiles(compoundAssignmentMatches(false, new CompoundAssignment(
operators,
Matchers.<ExpressionTree>anything(),
Matchers.<ExpressionTree>isArrayType())));
}
private Scanner compoundAssignmentMatches(
final boolean shouldMatch, final CompoundAssignment toMatch) {
return new Scanner() {
@Override
public Void visitCompoundAssignment(CompoundAssignmentTree node, VisitorState visitorState) {
assertTrue(node.toString(),
!shouldMatch ^ toMatch.matches(node, visitorState));
return super.visitCompoundAssignment(node, visitorState);
}
};
}
}