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// Copyright 2017 The Bazel Authors. 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.devtools.build.android;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.truth.FailureStrategy;
import com.google.common.truth.Subject;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nullable;
/**
* A testing utility that allows .java/.class related assertions against Paths.
*/
public class ClassPathsSubject extends Subject<ClassPathsSubject, Path> {
ClassPathsSubject(FailureStrategy failureStrategy, @Nullable Path subject) {
super(failureStrategy, subject);
}
void exists() {
if (getSubject() == null) {
fail("should not be null.");
}
if (!Files.exists(getSubject())) {
fail("exists.");
}
}
/**
* Check that the contents of the java file at the current path, is equivalent to the given
* expected contents (modulo header comments and surrounding whitespace).
*
* @param contents expected contents
*/
public void javaContentsIsEqualTo(String... contents) {
if (getSubject() == null) {
fail("should not be null.");
}
exists();
try {
assertThat(
trimWhitespace(
stripJavaHeaderComments(
Files.readAllLines(getSubject(), StandardCharsets.UTF_8))))
.containsExactly((Object[]) contents)
.inOrder();
} catch (IOException e) {
fail(e.toString());
}
}
private List<String> stripJavaHeaderComments(List<String> strings) {
List<String> result = new ArrayList<>();
boolean inComment = false;
for (String string : strings) {
if (string.trim().startsWith("/*")) {
inComment = true;
continue;
}
if (inComment) {
if (string.trim().startsWith("*/")) {
inComment = false;
continue;
}
continue;
}
result.add(string);
}
return result;
}
private List<String> trimWhitespace(List<String> strings) {
return Lists.transform(strings, new Function<String, String>() {
@Override
public String apply(String s) {
return s.trim();
}
});
}
/**
* Check the class file with the given name, assuming the current path is part of the classpath.
*
* @param className the fully qualified class name
*/
public ClassNameSubject withClass(String className) {
if (getSubject() == null) {
fail("should not be null.");
}
exists();
return new ClassNameSubject(failureStrategy, getSubject(), className);
}
static final class ClassNameSubject extends Subject<ClassNameSubject, String> {
private final Path basePath;
public ClassNameSubject(
FailureStrategy failureStrategy, Path basePath, String subject) {
super(failureStrategy, subject);
this.basePath = basePath;
}
public void classContentsIsEqualTo(
ImmutableMap<String, Integer> intFields,
ImmutableMap<String, List<Integer>> intArrayFields,
boolean areFieldsFinal) throws Exception {
String expectedClassName = getSubject();
URLClassLoader urlClassLoader = new URLClassLoader(new URL[]{basePath.toUri().toURL()});
Class<?> innerClass = urlClassLoader.loadClass(expectedClassName);
assertThat(innerClass.getSuperclass()).isEqualTo(Object.class);
assertThat(innerClass.getEnclosingClass().toString())
.endsWith(expectedClassName.substring(0, expectedClassName.indexOf('$')));
ImmutableMap.Builder<String, Integer> actualIntFields = ImmutableMap.builder();
ImmutableMap.Builder<String, List<Integer>> actualIntArrayFields = ImmutableMap.builder();
for (Field f : innerClass.getFields()) {
int fieldModifiers = f.getModifiers();
assertThat(Modifier.isFinal(fieldModifiers)).isEqualTo(areFieldsFinal);
assertThat(Modifier.isPublic(fieldModifiers)).isTrue();
assertThat(Modifier.isStatic(fieldModifiers)).isTrue();
Class<?> fieldType = f.getType();
if (fieldType.isPrimitive()) {
assertThat(fieldType).isEqualTo(Integer.TYPE);
actualIntFields.put(f.getName(), (Integer) f.get(null));
} else {
assertThat(fieldType.isArray()).isTrue();
int[] asArray = (int[]) f.get(null);
ImmutableList.Builder<Integer> list = ImmutableList.builder();
for (int i : asArray) {
list.add(i);
}
actualIntArrayFields.put(f.getName(), list.build());
}
}
assertThat(actualIntFields.build()).containsExactlyEntriesIn(intFields).inOrder();
assertThat(actualIntArrayFields.build()).containsExactlyEntriesIn(intArrayFields).inOrder();
}
}
}
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