Java ClassLoader Load getConfigFileInputStream(String configFilePath)

Description

get Config File Input Stream

License

Open Source License

Declaration

public static InputStream getConfigFileInputStream(String configFilePath) throws IOException 

Method Source Code

//package com.java2s;
/*//from   w w w  .ja va 2 s  . co  m
 * Copyright (c) 2013 Yahoo! Inc. 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. See accompanying LICENSE file.
 */

import java.io.*;
import java.net.URL;
import java.util.*;

public class Main {
    public static InputStream getConfigFileInputStream(String configFilePath) throws IOException {
        if (null == configFilePath) {
            throw new IOException("Could not find config file, name not specified");
        }

        HashSet<URL> resources = new HashSet<URL>(findResources(configFilePath));

        if (resources.isEmpty()) {
            File configFile = new File(configFilePath);

            if (configFile.exists()) {
                return new FileInputStream(configFile);
            }
        } else if (resources.size() > 1) {
            throw new IOException("Found multiple " + configFilePath
                    + " resources. You're probably bundling the Storm jars with your topology jar. " + resources);
        } else {

            //          LOG.debug("Using "+configFilePath+" from resources");
            URL resource = resources.iterator().next();

            return resource.openStream();
        }

        return null;
    }

    public static List<URL> findResources(String name) {
        try {
            Enumeration<URL> resources = Thread.currentThread().getContextClassLoader().getResources(name);
            List<URL> ret = new ArrayList<URL>();

            while (resources.hasMoreElements()) {
                ret.add(resources.nextElement());
            }

            return ret;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Related

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2. getAllArquillianLibs()
3. getAsProperties(final String name)
4. getBaseDir()
5. getBytes(File file)
6. getContentFromFile(String fileName, Object context)
7. getDirectories(String path)
8. getFile(final String filename)
9. getFile(final String name)