org.apache.hadoop.util.TestJarFinder.java Source code

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Here is the source code for org.apache.hadoop.util.TestJarFinder.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.util;

import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Assert;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.Properties;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

public class TestJarFinder {

    @Test
    public void testJar() throws Exception {

        //picking a class that is for sure in a JAR in the classpath
        String jar = JarFinder.getJar(LogFactory.class);
        Assert.assertTrue(new File(jar).exists());
    }

    private static void delete(File file) throws IOException {
        if (file.getAbsolutePath().length() < 5) {
            throw new IllegalArgumentException(
                    MessageFormat.format("Path [{0}] is too short, not deleting", file.getAbsolutePath()));
        }
        if (file.exists()) {
            if (file.isDirectory()) {
                File[] children = file.listFiles();
                if (children != null) {
                    for (File child : children) {
                        delete(child);
                    }
                }
            }
            if (!file.delete()) {
                throw new RuntimeException(
                        MessageFormat.format("Could not delete path [{0}]", file.getAbsolutePath()));
            }
        }
    }

    @Test
    public void testExpandedClasspath() throws Exception {
        //picking a class that is for sure in a directory in the classpath
        //in this case the JAR is created on the fly
        String jar = JarFinder.getJar(TestJarFinder.class);
        Assert.assertTrue(new File(jar).exists());
    }

    @Test
    public void testExistingManifest() throws Exception {
        File dir = GenericTestUtils.getTestDir(TestJarFinder.class.getName() + "-testExistingManifest");
        delete(dir);
        dir.mkdirs();

        File metaInfDir = new File(dir, "META-INF");
        metaInfDir.mkdirs();
        File manifestFile = new File(metaInfDir, "MANIFEST.MF");
        Manifest manifest = new Manifest();
        OutputStream os = new FileOutputStream(manifestFile);
        manifest.write(os);
        os.close();

        File propsFile = new File(dir, "props.properties");
        Writer writer = new FileWriter(propsFile);
        new Properties().store(writer, "");
        writer.close();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JarOutputStream zos = new JarOutputStream(baos);
        JarFinder.jarDir(dir, "", zos);
        JarInputStream jis = new JarInputStream(new ByteArrayInputStream(baos.toByteArray()));
        Assert.assertNotNull(jis.getManifest());
        jis.close();
    }

    @Test
    public void testNoManifest() throws Exception {
        File dir = GenericTestUtils.getTestDir(TestJarFinder.class.getName() + "-testNoManifest");
        delete(dir);
        dir.mkdirs();
        File propsFile = new File(dir, "props.properties");
        Writer writer = new FileWriter(propsFile);
        new Properties().store(writer, "");
        writer.close();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JarOutputStream zos = new JarOutputStream(baos);
        JarFinder.jarDir(dir, "", zos);
        JarInputStream jis = new JarInputStream(new ByteArrayInputStream(baos.toByteArray()));
        Assert.assertNotNull(jis.getManifest());
        jis.close();
    }
}