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// Copyright 2014 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.lib.testutil;
import com.google.common.base.Preconditions;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* A helper class to find all classes on the current classpath. This is used to automatically create
* JUnit 3 and 4 test suites.
*/
final class Classpath {
private static final String CLASS_EXTENSION = ".class";
/**
* Finds all classes that live in or below the given package.
*/
static Set<Class<?>> findClasses(String packageName) {
Set<Class<?>> result = new LinkedHashSet<>();
String pathPrefix = (packageName + '.').replace('.', '/');
for (String entryName : getClassPath()) {
File classPathEntry = new File(entryName);
if (classPathEntry.exists()) {
try {
Set<String> classNames;
if (classPathEntry.isDirectory()) {
classNames = findClassesInDirectory(classPathEntry, pathPrefix);
} else {
classNames = findClassesInJar(classPathEntry, pathPrefix);
}
for (String className : classNames) {
Class<?> clazz = Class.forName(className);
result.add(clazz);
}
} catch (IOException e) {
throw new AssertionError("Can't read classpath entry "
+ entryName + ": " + e.getMessage());
} catch (ClassNotFoundException e) {
throw new AssertionError("Class not found even though it is on the classpath "
+ entryName + ": " + e.getMessage());
}
}
}
return result;
}
private static Set<String> findClassesInDirectory(File classPathEntry, String pathPrefix) {
Set<String> result = new TreeSet<>();
File directory = new File(classPathEntry, pathPrefix);
innerFindClassesInDirectory(result, directory, pathPrefix);
return result;
}
/**
* Finds all classes and sub packages in the given directory that are below the given package and
* add them to the respective sets.
*
* @param directory Directory to inspect
* @param pathPrefix Prefix for the path to the classes that are requested
* (ex: {@code com/google/foo/bar})
*/
private static void innerFindClassesInDirectory(Set<String> classNames, File directory,
String pathPrefix) {
Preconditions.checkArgument(pathPrefix.endsWith("/"));
if (directory.exists()) {
for (File f : directory.listFiles()) {
String name = f.getName();
if (name.endsWith(CLASS_EXTENSION)) {
String clzName = getClassName(pathPrefix + name);
classNames.add(clzName);
} else if (f.isDirectory()) {
findClassesInDirectory(f, pathPrefix + name + "/");
}
}
}
}
/**
* Returns a set of all classes in the jar that start with the given prefix.
*/
private static Set<String> findClassesInJar(File jarFile, String pathPrefix) throws IOException {
Set<String> classNames = new TreeSet<>();
try (ZipFile zipFile = new ZipFile(jarFile)) {
Enumeration<? extends ZipEntry> entries = zipFile.entries();
while (entries.hasMoreElements()) {
String entryName = entries.nextElement().getName();
if (entryName.startsWith(pathPrefix) && entryName.endsWith(CLASS_EXTENSION)) {
classNames.add(getClassName(entryName));
}
}
}
return classNames;
}
/**
* Given the absolute path of a class file, return the class name.
*/
private static String getClassName(String className) {
int classNameEnd = className.length() - CLASS_EXTENSION.length();
return className.substring(0, classNameEnd).replace('/', '.');
}
/**
* Gets the class path from the System Property "java.class.path" and splits
* it up into the individual elements.
*/
private static String[] getClassPath() {
String classPath = System.getProperty("java.class.path");
String separator = System.getProperty("path.separator", ":");
return classPath.split(Pattern.quote(separator));
}
}
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