interactivespaces.workbench.project.test.JunitTestClassDetector.java Source code

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Here is the source code for interactivespaces.workbench.project.test.JunitTestClassDetector.java

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/*
 * Copyright (C) 2013 Google Inc.
 *
 * 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 interactivespaces.workbench.project.test;

import interactivespaces.InteractiveSpacesException;

import com.google.common.collect.Lists;
import com.google.common.io.Closeables;

import org.objectweb.asm.ClassReader;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.List;

/**
 * A detector for classes with JUnit tests in them.
 *
 * @author Keith M. Hughes
 */
public class JunitTestClassDetector {

    /**
     * File extension for class files.
     */
    public static final String CLASS_FILE_EXTENSION = ".class";

    /**
     * Find all test classes in the given directory.
     *
     * @param directory
     *          the directory to start looking for classes
     *
     * @return list of all test classes in the directory
     */
    public List<JunitTestClassVisitor> findTestClasses(File directory) {
        List<JunitTestClassVisitor> testClasses = Lists.newArrayList();

        scanDirectory(directory, testClasses);

        return testClasses;
    }

    /**
     * Get all test classes
     *
     * @param directory
     *          the directory to scan
     * @param testClasses
     *          a list to put the found classes in
     */
    private void scanDirectory(File directory, List<JunitTestClassVisitor> testClasses) {
        File[] contents = directory.listFiles();
        if (contents != null) {
            for (File file : contents) {
                if (file.isFile()) {
                    if (file.getName().endsWith(CLASS_FILE_EXTENSION)) {
                        JunitTestClassVisitor classVisitor = classVisitor(file);
                        if (classVisitor.isTestClass() && !classVisitor.isAbstractClass()) {
                            testClasses.add(classVisitor);
                        }
                    }

                } else if (file.isDirectory()) {
                    scanDirectory(file, testClasses);
                }
            }
        }
    }

    private JunitTestClassVisitor classVisitor(File testClassFile) {
        JunitTestClassVisitor classVisitor = new JunitTestClassVisitor();

        InputStream classStream = null;
        try {
            classStream = new BufferedInputStream(new FileInputStream(testClassFile));

            ClassReader classReader = new ClassReader(classStream);
            classReader.accept(classVisitor,
                    ClassReader.SKIP_DEBUG | ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES);
        } catch (Throwable e) {
            throw new InteractiveSpacesException(
                    String.format("Could not process class file %s", testClassFile.getAbsolutePath()), e);
        } finally {
            Closeables.closeQuietly(classStream);
        }

        return classVisitor;
    }
}