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Code Issues Projects Releases Wiki Activity

#932 Create class collector and use it where applicable

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- Extract logic for walking through a directory and loading its classes into a separate class
- Replace all implementations with the new ClassCollector
This commit is contained in:
ljacqu 2016-09-07 22:50:12 +02:00
parent f63871600a
commit 10493a3fa3
7 changed files with 210 additions and 250 deletions
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165
src/test/java/fr/xephi/authme/ClassCollector.java Normal file
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@ -0,0 +1,165 @@
package fr.xephi.authme;
import java.io.File;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* Collects available classes by walking through a source directory.
* <p>
* This is a naive, zero dependency collector that walks through a file directory
* and loads classes from the class loader based on the .java files it encounters.
* This is a very slow approach and should be avoided for production code.
* <p>
* For more performant approaches, see e.g. <a href="https://github.com/ronmamo/reflections">org.reflections</a>.
*/
public class ClassCollector {
private final String root;
private final String nonCodePath;
/**
* Constructor. The arguments make up the path from which the collector will start scanning.
*
* @param nonCodePath beginning of the starting path that are not Java packages, e.g. {@code src/main/java/}
* @param packagePath folders following {@code nonCodePath} that are packages, e.g. {@code com/project/app}
*/
public ClassCollector(String nonCodePath, String packagePath) {
if (!nonCodePath.endsWith("/") && !nonCodePath.endsWith("\\")) {
nonCodePath = nonCodePath.concat(File.separator);
}
this.root = nonCodePath + packagePath;
this.nonCodePath = nonCodePath;
}
/**
* Collects all classes from the parent folder and below.
*
* @return all classes
*/
public List<Class<?>> collectClasses() {
return collectClasses(x -> true);
}
/**
* Collects all classes from the parent folder and below which are of type {@link T}.
*
* @param parent the parent which classes need to extend (or be equal to) in order to be collected
* @param <T> the parent type
* @return list of matching classes
*/
@SuppressWarnings("unchecked")
public <T> List<Class<? extends T>> collectClasses(Class<T> parent) {
List<Class<?>> classes = collectClasses(parent::isAssignableFrom);
return new ArrayList<>((List) classes);
}
/**
* Collects all classes from the parent folder and below which match the given predicate.
*
* @param filter the predicate classes need to satisfy in order to be collected
* @return list of matching classes
*/
public List<Class<?>> collectClasses(Predicate<Class<?>> filter) {
File rootFolder = new File(root);
List<Class<?>> collection = new ArrayList<>();
collectClasses(rootFolder, filter, collection);
return collection;
}
/**
* Constructs an instance of all classes which are of the provided type {@code clazz}.
* This method assumes that every class has an accessible no-args constructor for creation.
*
* @param parent the parent which classes need to extend (or be equal to) in order to be instantiated
* @param <T> the parent type
* @return collection of created objects
*/
public <T> List<T> getInstancesOfType(Class<T> parent) {
return getInstancesOfType(parent, (clz) -> {
try {
return canInstantiate(clz) ? clz.newInstance() : null;
} catch (InstantiationException | IllegalAccessException e) {
throw new IllegalStateException(e);
}
});
}
/**
* Constructs an instance of all classes which are of the provided type {@code clazz}
* with the provided {@code instantiator}.
*
* @param parent the parent which classes need to extend (or be equal to) in order to be instantiated
* @param instantiator function which returns an object of the given class, or null to skip the class
* @param <T> the parent type
* @return collection of created objects
*/
public <T> List<T> getInstancesOfType(Class<T> parent, Function<Class<? extends T>, T> instantiator) {
return collectClasses(parent)
.stream()
.map(instantiator)
.filter(o -> o != null)
.collect(Collectors.toList());
}
/**
* Returns whether the given class can be instantiated, i.e. if it is not abstract, an interface, etc.
*
* @param clazz the class to process
* @return true if the class can be instantiated, false otherwise
*/
public static boolean canInstantiate(Class<?> clazz) {
return clazz != null && !clazz.isEnum() && !clazz.isInterface()
&& !clazz.isArray() && !Modifier.isAbstract(clazz.getModifiers());
}
/**
* Recursively collects the classes based on the files in the directory and in its child directories.
*
* @param folder the folder to scan
* @param filter the class predicate
* @param collection collection to add classes to
*/
private void collectClasses(File folder, Predicate<Class<?>> filter, List<Class<?>> collection) {
File[] files = folder.listFiles();
if (files == null) {
throw new IllegalStateException("Could not read files from '" + folder + "'");
}
for (File file : files) {
if (file.isDirectory()) {
collectClasses(file, filter, collection);
} else if (file.isFile()) {
Class<?> clazz = loadTaskClassFromFile(file);
if (clazz != null && filter.test(clazz)) {
collection.add(clazz);
}
}
}
}
/**
* Loads a class from the class loader based on the given file.
*
* @param file the file whose corresponding Java class should be retrieved
* @return the corresponding class, or null if not applicable
*/
private Class<?> loadTaskClassFromFile(File file) {
if (!file.getName().endsWith(".java")) {
return null;
}
String filePath = file.getPath();
String className = filePath
.substring(nonCodePath.length(), filePath.length() - 5)
.replace(File.separator, ".");
try {
return Class.forName(className);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
}

2
src/test/java/fr/xephi/authme/TestHelper.java
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@ -28,6 +28,8 @@ import static org.mockito.Mockito.verify;
*/
public final class TestHelper {
public static final String SOURCES_FOLDER = "src/main/java/";
public static final String TEST_SOURCES_FOLDER = "src/test/java/";
public static final String PROJECT_ROOT = "/fr/xephi/authme/";
private TestHelper() {

39
src/test/java/fr/xephi/authme/events/EventsConsistencyTest.java
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@ -1,14 +1,14 @@
package fr.xephi.authme.events;
import fr.xephi.authme.ClassCollector;
import fr.xephi.authme.TestHelper;
import org.apache.commons.lang.reflect.MethodUtils;
import org.bukkit.event.Event;
import org.junit.BeforeClass;
import org.junit.Test;
import java.io.File;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import static org.hamcrest.Matchers.equalTo;
@ -20,25 +20,14 @@ import static org.junit.Assert.assertThat;
*/
public class EventsConsistencyTest {
private static final String SRC_FOLDER = "src/main/java/";
private static final String EVENTS_FOLDER = SRC_FOLDER + "/fr/xephi/authme/events/";
private static final String EVENTS_FOLDER = TestHelper.PROJECT_ROOT + "events/";
private static List<Class<? extends Event>> classes;
@BeforeClass
public static void scanEventClasses() {
File eventsFolder = new File(EVENTS_FOLDER);
File[] filesInFolder = eventsFolder.listFiles();
if (filesInFolder == null || filesInFolder.length == 0) {
throw new IllegalStateException("Could not read folder '" + EVENTS_FOLDER + "'. Is it correct?");
}
ClassCollector classCollector = new ClassCollector(TestHelper.SOURCES_FOLDER, EVENTS_FOLDER);
classes = classCollector.collectClasses(Event.class);
classes = new ArrayList<>();
for (File file : filesInFolder) {
Class<? extends Event> clazz = getEventClassFromFile(file);
if (clazz != null) {
classes.add(clazz);
}
}
if (classes.isEmpty()) {
throw new IllegalStateException("Did not find any AuthMe event classes. Is the folder correct?");
}
@ -74,22 +63,4 @@ public class EventsConsistencyTest {
private static boolean canBeInstantiated(Class<?> clazz) {
return !clazz.isInterface() && !clazz.isEnum() && !Modifier.isAbstract(clazz.getModifiers());
}
@SuppressWarnings("unchecked")
private static Class<? extends Event> getEventClassFromFile(File file) {
String fileName = file.getPath();
String className = fileName
.substring(SRC_FOLDER.length(), fileName.length() - ".java".length())
.replace(File.separator, ".");
try {
Class<?> clazz = EventsConsistencyTest.class.getClassLoader().loadClass(className);
if (Event.class.isAssignableFrom(clazz)) {
return (Class<? extends Event>) clazz;
}
return null;
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Could not load class '" + className + "'", e);
}
}
}

40
src/test/java/fr/xephi/authme/settings/properties/SettingsClassConsistencyTest.java
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@ -2,15 +2,14 @@ package fr.xephi.authme.settings.properties;
import com.github.authme.configme.SettingsHolder;
import com.github.authme.configme.properties.Property;
import fr.xephi.authme.ClassCollector;
import fr.xephi.authme.ReflectionTestUtils;
import fr.xephi.authme.TestHelper;
import org.junit.BeforeClass;
import org.junit.Test;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@ -24,25 +23,14 @@ import static org.junit.Assert.fail;
*/
public class SettingsClassConsistencyTest {
private static final String SETTINGS_FOLDER = "src/main/java/fr/xephi/authme/settings/properties";
private static final String SETTINGS_FOLDER = TestHelper.PROJECT_ROOT + "settings/properties";
private static List<Class<? extends SettingsHolder>> classes;
@BeforeClass
public static void scanForSettingsClasses() {
File settingsFolder = new File(SETTINGS_FOLDER);
File[] filesInFolder = settingsFolder.listFiles();
if (filesInFolder == null || filesInFolder.length == 0) {
throw new IllegalStateException("Could not read folder '" + SETTINGS_FOLDER + "'. Is it correct?");
}
classes = new ArrayList<>();
for (File file : filesInFolder) {
Class<? extends SettingsHolder> clazz = getSettingsClassFromFile(file);
if (clazz != null) {
classes.add(clazz);
}
}
System.out.println("Found " + classes.size() + " SettingsClass implementations");
ClassCollector collector = new ClassCollector(TestHelper.SOURCES_FOLDER, SETTINGS_FOLDER);
classes = collector.collectClasses(SettingsHolder.class);
System.out.println("Found " + classes.size() + " SettingsHolder implementations");
}
/**
@ -93,22 +81,4 @@ public class SettingsClassConsistencyTest {
int modifiers = field.getModifiers();
return Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers);
}
@SuppressWarnings("unchecked")
private static Class<? extends SettingsHolder> getSettingsClassFromFile(File file) {
String fileName = file.getPath();
String className = fileName
.substring("src/main/java/".length(), fileName.length() - ".java".length())
.replace(File.separator, ".");
try {
Class<?> clazz = SettingsClassConsistencyTest.class.getClassLoader().loadClass(className);
if (SettingsHolder.class.isAssignableFrom(clazz)) {
return (Class<? extends SettingsHolder>) clazz;
}
return null;
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Could not load class '" + className + "'", e);
}
}
}

110
src/test/java/tools/ToolsRunner.java
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@ -1,23 +1,23 @@
package tools;
import fr.xephi.authme.ClassCollector;
import fr.xephi.authme.TestHelper;
import tools.utils.AutoToolTask;
import tools.utils.ToolTask;
import tools.utils.ToolsConstants;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;
/**
* Runner for executing tool tasks.
*/
public final class ToolsRunner {
private ToolsRunner() {
private Map<String, ToolTask> tasks;
private ToolsRunner(Map<String, ToolTask> tasks) {
this.tasks = tasks;
}
/**
@ -26,19 +26,23 @@ public final class ToolsRunner {
* @param args .
*/
public static void main(String... args) {
// Collect tasks and show them
File toolsFolder = new File(ToolsConstants.TOOLS_SOURCE_ROOT);
Map<String, ToolTask> tasks = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
collectTasksInDirectory(toolsFolder, tasks);
// Note ljacqu 20151212: If the tools folder becomes a lot bigger, it will make sense to restrict the depth
// of this recursive collector
ClassCollector collector = new ClassCollector(TestHelper.TEST_SOURCES_FOLDER, "tools");
Map<String, ToolTask> tasks = new HashMap<>();
for (ToolTask task : collector.getInstancesOfType(ToolTask.class)) {
tasks.put(task.getTaskName(), task);
}
ToolsRunner runner = new ToolsRunner(tasks);
if (args == null || args.length == 0) {
promptAndExecuteTask(tasks);
runner.promptAndExecuteTask();
} else {
executeAutomaticTasks(tasks, args);
runner.executeAutomaticTasks(args);
}
}
private static void promptAndExecuteTask(Map<String, ToolTask> tasks) {
private void promptAndExecuteTask() {
System.out.println("The following tasks are available:");
for (String key : tasks.keySet()) {
System.out.println("- " + key);
@ -57,7 +61,7 @@ public final class ToolsRunner {
scanner.close();
}
private static void executeAutomaticTasks(Map<String, ToolTask> tasks, String... requests) {
private void executeAutomaticTasks(String... requests) {
for (String taskName : requests) {
ToolTask task = tasks.get(taskName);
if (task == null) {
@ -69,80 +73,4 @@ public final class ToolsRunner {
}
}
}
/**
* Add all implementations of {@link ToolTask} from the given folder to the provided collection.
*
* @param dir The directory to scan
* @param taskCollection The collection to add results to
*/
// Note ljacqu 20151212: If the tools folder becomes a lot bigger, it will make sense to restrict the depth
// of this recursive collector
private static void collectTasksInDirectory(File dir, Map<String, ToolTask> taskCollection) {
File[] files = dir.listFiles();
if (files == null) {
throw new IllegalStateException("Cannot read folder '" + dir + "'");
}
for (File file : files) {
if (file.isDirectory()) {
collectTasksInDirectory(file, taskCollection);
} else if (file.isFile()) {
ToolTask task = getTaskFromFile(file);
if (task != null) {
taskCollection.put(task.getTaskName(), task);
}
}
}
}
/**
* Return a {@link ToolTask} instance defined by the given source file.
*
* @param file The file to load
* @return ToolTask instance, or null if not applicable
*/
private static ToolTask getTaskFromFile(File file) {
Class<? extends ToolTask> taskClass = loadTaskClassFromFile(file);
if (taskClass == null) {
return null;
}
try {
Constructor<? extends ToolTask> constructor = taskClass.getConstructor();
return constructor.newInstance();
} catch (NoSuchMethodException | InvocationTargetException |
IllegalAccessException | InstantiationException e) {
throw new IllegalStateException("Cannot instantiate task '" + taskClass + "'");
}
}
/**
* Return the class the file defines if it implements {@link ToolTask}.
*
* @return The class instance, or null if not applicable
*/
@SuppressWarnings("unchecked")
private static Class<? extends ToolTask> loadTaskClassFromFile(File file) {
if (!file.getName().endsWith(".java")) {
return null;
}
String filePath = file.getPath();
String className = "tools." + filePath
.substring(ToolsConstants.TOOLS_SOURCE_ROOT.length(), filePath.length() - 5)
.replace(File.separator, ".");
try {
Class<?> clazz = ToolsRunner.class.getClassLoader().loadClass(className);
return ToolTask.class.isAssignableFrom(clazz) && isInstantiable(clazz)
? (Class<? extends ToolTask>) clazz
: null;
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
private static boolean isInstantiable(Class<?> clazz) {
return !clazz.isInterface() && !Modifier.isAbstract(clazz.getModifiers());
}
}

54
src/test/java/tools/checktestmocks/CheckTestMocks.java
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@ -1,15 +1,14 @@
package tools.checktestmocks;
import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.Sets;
import fr.xephi.authme.ClassCollector;
import fr.xephi.authme.TestHelper;
import fr.xephi.authme.util.StringUtils;
import org.mockito.Mock;
import tools.utils.AutoToolTask;
import tools.utils.InjectorUtils;
import tools.utils.ToolsConstants;
import java.io.File;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
@ -38,33 +37,13 @@ public class CheckTestMocks implements AutoToolTask {
@Override
public void executeDefault() {
readAndCheckFiles(new File(ToolsConstants.TEST_SOURCE_ROOT));
ClassCollector collector = new ClassCollector(TestHelper.SOURCES_FOLDER, TestHelper.PROJECT_ROOT);
for (Class<?> clazz : collector.collectClasses(c -> isTestClassWithMocks(c))) {
checkClass(clazz);
}
System.out.println(StringUtils.join("\n", errors));
}
/**
* Recursively reads directories and checks the contained classes.
*
* @param dir the directory to read
*/
private void readAndCheckFiles(File dir) {
File[] files = dir.listFiles();
if (files == null) {
throw new IllegalStateException("Cannot read folder '" + dir + "'");
}
for (File file : files) {
if (file.isDirectory()) {
readAndCheckFiles(file);
} else if (file.isFile()) {
Class<?> clazz = loadTestClass(file);
if (clazz != null) {
checkClass(clazz);
}
// else System.out.format("No @Mock fields found in class of file '%s'%n", file.getName())
}
}
}
/**
* Checks the given test class' @Mock fields against the corresponding production class' @Inject fields.
*
@ -91,20 +70,6 @@ public class CheckTestMocks implements AutoToolTask {
errors.add(clazz.getSimpleName() + ": " + message);
}
private static Class<?> loadTestClass(File file) {
String fileName = file.getPath();
String className = fileName
// Strip source folders and .java ending
.substring("src/test/java/".length(), fileName.length() - 5)
.replace(File.separator, ".");
try {
Class<?> clazz = CheckTestMocks.class.getClassLoader().loadClass(className);
return isTestClassWithMocks(clazz) ? clazz : null;
} catch (ClassNotFoundException e) {
throw new UnsupportedOperationException(e);
}
}
private static Set<Class<?>> getMocks(Class<?> clazz) {
Set<Class<?>> result = new HashSet<>();
for (Field field : clazz.getDeclaredFields()) {
@ -147,12 +112,7 @@ public class CheckTestMocks implements AutoToolTask {
}
private static String formatClassList(Collection<Class<?>> coll) {
Collection<String> classNames = Collections2.transform(coll, new Function<Class<?>, String>() {
@Override
public String apply(Class<?> input) {
return input.getSimpleName();
}
});
Collection<String> classNames = Collections2.transform(coll, Class::getSimpleName);
return StringUtils.join(", ", classNames);
}

50
src/test/java/tools/dependencygraph/DrawDependency.java
View File

@ -5,6 +5,8 @@ import ch.jalu.injector.handlers.instantiation.Instantiation;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Multimap;
import fr.xephi.authme.ClassCollector;
import fr.xephi.authme.TestHelper;
import fr.xephi.authme.command.ExecutableCommand;
import fr.xephi.authme.converter.Converter;
import fr.xephi.authme.initialization.DataFolder;
@ -16,7 +18,6 @@ import tools.utils.InjectorUtils;
import tools.utils.ToolTask;
import tools.utils.ToolsConstants;
import java.io.File;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.nio.file.Files;
@ -34,15 +35,12 @@ import java.util.Scanner;
public class DrawDependency implements ToolTask {
private static final String DOT_FILE = ToolsConstants.TOOLS_SOURCE_ROOT + "dependencygraph/graph.dot";
// Package root
private static final String ROOT_PACKAGE = "fr.xephi.authme";
private static final List<Class<?>> SUPER_TYPES = ImmutableList.of(ExecutableCommand.class,
SynchronousProcess.class, AsynchronousProcess.class, EncryptionMethod.class, Converter.class, Listener.class);
/** Annotation types by which dependencies are identified. */
private static final List<Class<? extends Annotation>> ANNOTATION_TYPES =
ImmutableList.<Class<? extends Annotation>>of(DataFolder.class);
private static final List<Class<? extends Annotation>> ANNOTATION_TYPES = ImmutableList.of(DataFolder.class);
private boolean mapToSupertype;
// Map with the graph's nodes: value is one of the key's dependencies
@ -59,7 +57,10 @@ public class DrawDependency implements ToolTask {
mapToSupertype = "y".equalsIgnoreCase(scanner.nextLine());
// Gather all connections
readAndProcessFiles(new File(ToolsConstants.MAIN_SOURCE_ROOT));
ClassCollector collector = new ClassCollector(TestHelper.SOURCES_FOLDER, TestHelper.PROJECT_ROOT);
for (Class<?> clazz : collector.collectClasses()) {
processClass(clazz);
}
// Prompt user for simplification of graph
System.out.println("Do you want to remove classes that are not used as dependency elsewhere?");
@ -93,28 +94,6 @@ public class DrawDependency implements ToolTask {
System.out.format("Run 'dot -Tpng %s -o graph.png' to generate image (requires GraphViz)%n", DOT_FILE);
}
/**
* Recursively reads the given directory and processes the files.
*
* @param dir the directory to read
*/
private void readAndProcessFiles(File dir) {
File[] files = dir.listFiles();
if (files == null) {
throw new IllegalStateException("Cannot read folder '" + dir + "'");
}
for (File file : files) {
if (file.isDirectory()) {
readAndProcessFiles(file);
} else if (file.isFile()) {
Class<?> clazz = loadClass(file);
if (clazz != null) {
processClass(clazz);
}
}
}
}
private void processClass(Class<?> clazz) {
List<String> dependencies = getDependencies(clazz);
if (dependencies != null) {
@ -134,21 +113,6 @@ public class DrawDependency implements ToolTask {
return clazz;
}
// Load Class object for the class in the given file
private static Class<?> loadClass(File file) {
final String fileName = file.getPath().replace(File.separator, ".");
if (!fileName.endsWith(".java")) {
return null;
}
final String className = fileName
.substring(fileName.indexOf(ROOT_PACKAGE), fileName.length() - ".java".length());
try {
return DrawDependency.class.getClassLoader().loadClass(className);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
private List<String> getDependencies(Class<?> clazz) {
Instantiation<?> instantiation = InjectorUtils.getInstantiationMethod(clazz);
return instantiation == null ? null : formatInjectionDependencies(instantiation);