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 * "License"); you may not use this file except in compliance
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package org.apache.wink.common.internal.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Enumeration;

import org.apache.wink.common.internal.i18n.Messages;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FileLoader {

    protected FileLoader() {
    }

    private static final Logger logger = LoggerFactory.getLogger(FileLoader.class);

    /**
     * search for file using classloaders only and returns URL to the file if
     * found
     * 
     * @param fileName
     * @return
     * @throws FileNotFoundException
     */
    public static URL loadFile(String fileName) throws FileNotFoundException {
        Enumeration resources;
        try {
            resources = loadFileUsingClassLoaders(fileName);
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
            throw new FileNotFoundException(fileName);
        }
        if (!resources.hasMoreElements()) {
            throw new FileNotFoundException(fileName);
        }
        return resources.nextElement();
    }

    /**
     * 

* loads file *

* first searches for file in file system *

* if not found, searchs for file using classloaders * * @param fileName * @return * @throws FileNotFoundException * @throws URISyntaxException */ public static InputStream loadFileAsStream(String fileName) throws FileNotFoundException { if (fileName == null || fileName.trim().equals("")) { //$NON-NLS-1$ throw new NullPointerException(Messages.getMessage("variableIsNull", "fileName")); //$NON-NLS-1$ //$NON-NLS-2$ } logger.trace("Searching for {} in file system.", fileName); //$NON-NLS-1$ File file = new File(fileName); if (file.isFile()) { // since file is a normal file, return it logger.trace("File {} found in file system.", fileName); //$NON-NLS-1$ return new FileInputStream(file); } // file is not a normal file, try to find it using classloaders Enumeration resources; try { resources = loadFileUsingClassLoaders(fileName); } catch (IOException e) { logger.error(e.getMessage(), e); throw new FileNotFoundException(fileName); } if (!resources.hasMoreElements()) { throw new FileNotFoundException(fileName); } URL url = resources.nextElement(); try { return url.openStream(); } catch (IOException e) { logger.error(e.getMessage(), e); throw new FileNotFoundException(fileName); } } /** * find file using class loaders * * @param filename * @return * @throws IOException */ public static Enumeration loadFileUsingClassLoaders(String filename) throws IOException { /* * TODO: perhaps desirable to move this code to * org.apache.wink.common.internal.utils.ClassUtils? */ logger.trace("Searching for {} using thread context classloader.", filename); //$NON-NLS-1$ ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Enumeration resources = loadFileUsingClassLoader(classLoader, filename); if (resources.hasMoreElements()) { return resources; } logger.trace("Searching for {} using current classloader.", filename); //$NON-NLS-1$ classLoader = FileLoader.class.getClassLoader(); resources = loadFileUsingClassLoader(classLoader, filename); if (resources.hasMoreElements()) { return resources; } logger.trace("Searching for {} using system classloader.", filename); //$NON-NLS-1$ return ClassLoader.getSystemResources(filename); } private static Enumeration loadFileUsingClassLoader(ClassLoader classLoader, String filename) throws IOException { Enumeration resources = null; if (classLoader != null) { resources = classLoader.getResources(filename); } return resources; } }





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