/*
* Copyright 2014 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.ExpressionTree;
import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.MemberSelectTree;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* @author deminguyen@google.com (Demi Nguyen)
*/
@RunWith(JUnit4.class)
public class NonNullLiteralTest extends CompilerBasedAbstractTest {
@Test
public void shouldMatchPrimitiveLiterals() {
writeFile("A.java",
"public class A {",
" public int getInt() {",
" return 2;",
" }",
" public long getLong() {",
" return 3L;",
" }",
" public float getFloat() {",
" return 4.0f;",
" }",
" public double getDouble() {",
" return 5.0d;",
" }",
" public boolean getBool() {",
" return true;",
" }",
" public char getChar() {",
" return 'c';",
" }",
" public String getString() {",
" return \"test string\";",
" }",
"}"
);
assertCompiles(nonNullLiteralMatches(true, Matchers.nonNullLiteral()));
}
@Test
public void shouldMatchClassLiteral() {
writeFile("A.java",
"import java.lang.reflect.Type;",
"public class A {",
" public void testClassLiteral() {",
" Type klass = String.class;",
" }",
"}"
);
assertCompiles(nonNullLiteralMatches(true, Matchers.nonNullLiteral()));
}
@Test
public void shouldNotMatchClassDeclaration() {
writeFile("A.java",
"public class A {",
" protected class B {",
" private class C {",
" }",
" }",
"}"
);
assertCompiles(nonNullLiteralMatches(false, Matchers.nonNullLiteral()));
}
@Test
public void shouldNotMatchMemberAccess() {
writeFile("A.java",
"package com.google;",
"public class A {",
" public String stringVar;",
" public void testMemberAccess() {",
" this.stringVar = new String();",
" }",
"}"
);
writeFile("B.java",
"import com.google.A;",
"public class B {",
" public void testInstanceMemberAccess() {",
" A foo = new A();",
" foo.stringVar = new String();",
" }",
"}"
);
assertCompiles(nonNullLiteralMatches(false, Matchers.nonNullLiteral()));
}
private Scanner nonNullLiteralMatches(
final boolean shouldMatch, final Matcher<ExpressionTree> toMatch) {
return new Scanner() {
@Override
public Void visitLiteral(LiteralTree node, VisitorState visitorState) {
assertTrue(node.toString(), !shouldMatch ^ toMatch.matches(node, visitorState));
return super.visitLiteral(node, visitorState);
}
@Override
public Void visitMemberSelect(MemberSelectTree node, VisitorState visitorState) {
assertTrue(node.toString(), !shouldMatch ^ toMatch.matches(node, visitorState));
return super.visitMemberSelect(node, visitorState);
}
};
}
}