com.arrow.acs.ManifestUtils.java Source code

Introduction

Here is the source code for com.arrow.acs.ManifestUtils.java

Source

/*******************************************************************************
 * Copyright (c) 2017 Arrow Electronics, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License 2.0
 * which accompanies this distribution, and is available at
 * http://apache.org/licenses/LICENSE-2.0
 *
 * Contributors:
 *     Arrow Electronics, Inc.
 *******************************************************************************/
package com.arrow.acs;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;

public class ManifestUtils {
    private final static Loggable LOGGER = new Loggable(ManifestUtils.class.getName()) {
    };

    public static Manifest readManifest(Class<?> clazz) {
        String method = "readManifest";
        String jarFile = null;
        String path = clazz.getProtectionDomain().getCodeSource().getLocation().toString();
        for (String token : path.split("/")) {
            token = token.replace("!", "").toLowerCase().trim();
            if (token.endsWith(".jar")) {
                jarFile = token;
                break;
            }
        }
        LOGGER.logInfo(method, "className: %s, path: %s, jarFile: %s", clazz.getName(), path, jarFile);
        InputStream is = null;
        try {
            if (!StringUtils.isEmpty(jarFile)) {
                Enumeration<URL> enumeration = Thread.currentThread().getContextClassLoader()
                        .getResources(JarFile.MANIFEST_NAME);
                while (enumeration.hasMoreElements()) {
                    URL url = enumeration.nextElement();
                    for (String token : url.toString().split("/")) {
                        token = token.replace("!", "").toLowerCase();
                        if (token.equals(jarFile)) {
                            LOGGER.logInfo(method, "loading manifest from: %s", url.toString());
                            return new Manifest(is = url.openStream());
                        }
                    }
                }
            } else {
                URL url = new URL(path + "/META-INF/MANIFEST.MF");
                LOGGER.logInfo(method, "loading manifest from: %s", url.toString());
                return new Manifest(is = url.openStream());
            }
        } catch (IOException e) {
        } finally {
            IOUtils.closeQuietly(is);
        }
        LOGGER.logError(method, "manifest file not found for: %s", clazz.getName());
        return null;
    }
}