package java.lang;

public abstract class ClassLoader {

    /**
     * Finds the resource with the given name.  A resource is some data
     * (images, audio, text, etc) that can be accessed by class code in a way
     * that is independent of the location of the code.
     *
     * <p> The name of a resource is a '<tt>/</tt>'-separated path name that
     * identifies the resource.
     *
     * <p> This method will first search the parent class loader for the
     * resource; if the parent is <tt>null</tt> the path of the class loader
     * built-in to the virtual machine is searched.  That failing, this method
     * will invoke {@link #findResource(String)} to find the resource.  </p>
     *
     * @apiNote When overriding this method it is recommended that an
     * implementation ensures that any delegation is consistent with the {@link
     * #getResources(java.lang.String) getResources(String)} method.
     *
     * @param  name
     *         The resource name
     *
     * @return  A <tt>URL</tt> object for reading the resource, or
     *          <tt>null</tt> if the resource could not be found or the invoker
     *          doesn't have adequate  privileges to get the resource.
     *
     * @since  1.1
     */
    public URL getResource(String name) {
        URL url;
        if (parent != null) {
            url = parent.getResource(name);
        } else {
            url = getBootstrapResource(name);
        }
        if (url == null) {
            url = findResource(name);
        }
        return url;
    }

    /**
     * Find resources from the VM's built-in classloader.
     */
    private static URL getBootstrapResource(String name) {
        URLClassPath ucp = getBootstrapClassPath();
        Resource res = ucp.getResource(name);
        return res != null ? res.getURL() : null;
    }

    /**
     * Find a resource of the specified name from the search path used to load
     * classes.  This method locates the resource through the system class
     * loader (see {@link #getSystemClassLoader()}).
     *
     * @param  name
     *         The resource name
     *
     * @return  A {@link java.net.URL <tt>URL</tt>} object for reading the
     *          resource, or <tt>null</tt> if the resource could not be found
     *
     * @since  1.1
     */
    public static URL getSystemResource(String name) {
        ClassLoader system = getSystemClassLoader();
        if (system == null) {
            return getBootstrapResource(name);
        }
        return system.getResource(name);
    }
}

URL url = Loader.getResource("log4j.xml");

package org.apache.log4j.helpers;

/**
 * Load resources (or images) from various sources
 */
public class Loader  { 

  static final String TSTR = "Caught Exception while in Loader.getResource. This may be innocuous.";

  // We conservatively assume that we are running under Java 1.x
  static private boolean java1 = true;
  
  static private boolean ignoreTCL = false;
  
  static {
    String prop = OptionConverter.getSystemProperty("java.version", null);
    
    if(prop != null) {
      int i = prop.indexOf('.');
      if(i != -1) {	
	if(prop.charAt(i+1) != '1')
	  java1 = false;
      } 
    }
    String ignoreTCLProp = OptionConverter.getSystemProperty("log4j.ignoreTCL", null);
    if(ignoreTCLProp != null) {
      ignoreTCL = OptionConverter.toBoolean(ignoreTCLProp, true);      
    }   
  }
  

  /**
     This method will search for <code>resource</code> in different
     places. The search order is as follows:

     <ol>

     <p><li>Search for <code>resource</code> using the thread context
     class loader under Java2. If that fails, search for
     <code>resource</code> using the class loader that loaded this
     class (<code>Loader</code>). Under JDK 1.1, only the the class
     loader that loaded this class (<code>Loader</code>) is used.

     <p><li>Try one last time with
     <code>ClassLoader.getSystemResource(resource)</code>, that is is
     using the system class loader in JDK 1.2 and virtual machine's
     built-in class loader in JDK 1.1.

     </ol>
  */
  static public URL getResource(String resource) {
    ClassLoader classLoader = null;
    URL url = null;
    
    try {
  	if(!java1 && !ignoreTCL) {
  	  classLoader = getTCL();
  	  if(classLoader != null) {
  	    LogLog.debug("Trying to find ["+resource+"] using context classloader "
  			 +classLoader+".");
  	    url = classLoader.getResource(resource);      
  	    if(url != null) {
  	      return url;
  	    }
  	  }
  	}
  	
  	// We could not find resource. Ler us now try with the
  	// classloader that loaded this class.
  	classLoader = Loader.class.getClassLoader(); 
  	if(classLoader != null) {
  	  LogLog.debug("Trying to find ["+resource+"] using "+classLoader
  		       +" class loader.");
  	  url = classLoader.getResource(resource);
  	  if(url != null) {
  	    return url;
  	  }
  	}
    } catch(IllegalAccessException t) {
        LogLog.warn(TSTR, t);
    } catch(InvocationTargetException t) {
        if (t.getTargetException() instanceof InterruptedException
                || t.getTargetException() instanceof InterruptedIOException) {
            Thread.currentThread().interrupt();
        }
        LogLog.warn(TSTR, t);
    } catch(Throwable t) {
      //  can't be InterruptedException or InterruptedIOException
      //    since not declared, must be error or RuntimeError.
      LogLog.warn(TSTR, t);
    }
    
    // Last ditch attempt: get the resource from the class path. It
    // may be the case that clazz was loaded by the Extentsion class
    // loader which the parent of the system class loader. Hence the
    // code below.
    LogLog.debug("Trying to find ["+resource+
  		   "] using ClassLoader.getSystemResource().");
    return ClassLoader.getSystemResource(resource);
  } 
  
  /**
     Are we running under JDK 1.x?        
  */
  public static boolean isJava1() {
    return java1;
  }
  
  /**
    * Get the Thread Context Loader which is a JDK 1.2 feature. If we
    * are running under JDK 1.1 or anything else goes wrong the method
    * returns <code>null<code>.
    *
    *  */
  private static ClassLoader getTCL() throws IllegalAccessException, 
    InvocationTargetException {

    // Are we running on a JDK 1.2 or later system?
    Method method = null;
    try {
      method = Thread.class.getMethod("getContextClassLoader", null);
    } catch (NoSuchMethodException e) {
      // We are running on JDK 1.1
      return null;
    }
    
    return (ClassLoader) method.invoke(Thread.currentThread(), null);
  }

<!-- *******************************
     ***** CACHE CONFIGURATION *****
     ******************************* -->                
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
    <property name="cacheManager" ref="ehcache"/>
</bean>
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
    <property name="configLocation" value="classpath:config/ehcache.xml"/>
    <property name="shared" value="true"/>
</bean>

public class EhCacheManagerFactoryBean implements FactoryBean<CacheManager>, InitializingBean, DisposableBean {
	private Resource configLocation;
	/**
	 * Set the location of the EhCache config file. A typical value is "/WEB-INF/ehcache.xml".
	 * <p>Default is "ehcache.xml" in the root of the class path, or if not found,
	 * "ehcache-failsafe.xml" in the EhCache jar (default EhCache initialization).
	 * @see net.sf.ehcache.CacheManager#create(java.io.InputStream)
	 * @see net.sf.ehcache.CacheManager#CacheManager(java.io.InputStream)
	 */
	public void setConfigLocation(Resource configLocation) {
		this.configLocation = configLocation;
	}

	@Override
	public void afterPropertiesSet() throws CacheException, IOException {
		logger.info("Initializing EhCache CacheManager");
		InputStream is = (this.configLocation != null ? this.configLocation.getInputStream() : null);
		try {
			Configuration configuration = (is != null ?
					ConfigurationFactory.parseConfiguration(is) : ConfigurationFactory.parseConfiguration());
			if (this.cacheManagerName != null) {
				configuration.setName(this.cacheManagerName);
			}
			if (this.shared) {
				// Old-school EhCache singleton sharing...
				// No way to find out whether we actually created a new CacheManager
				// or just received an existing singleton reference.
				this.cacheManager = CacheManager.create(configuration);
			}
			else if (this.acceptExisting) {
				// EhCache 2.5+: Reusing an existing CacheManager of the same name.
				// Basically the same code as in CacheManager.getInstance(String),
				// just storing whether we're dealing with an existing instance.
				synchronized (CacheManager.class) {
					this.cacheManager = CacheManager.getCacheManager(this.cacheManagerName);
					if (this.cacheManager == null) {
						this.cacheManager = new CacheManager(configuration);
					}
					else {
						this.locallyManaged = false;
					}
				}
			}
			else {
				// Throwing an exception if a CacheManager of the same name exists already...
				this.cacheManager = new CacheManager(configuration);
			}
		}
		finally {
			if (is != null) {
				is.close();
			}
		}
	}
}

InputStream is = (this.configLocation != null ? this.configLocation.getInputStream() : null);
Configuration configuration = (is != null ?
					ConfigurationFactory.parseConfiguration(is) : ConfigurationFactory.parseConfiguration());

package net.sf.ehcache.config;

public final class ConfigurationFactory {

    private static final String DEFAULT_CLASSPATH_CONFIGURATION_FILE = "/ehcache.xml";
    private static final String FAILSAFE_CLASSPATH_CONFIGURATION_FILE = "/ehcache-failsafe.xml";

    /**
     * Configures a bean from an XML input stream.
     */
    public static Configuration parseConfiguration(final InputStream inputStream) throws CacheException {

        LOG.debug("Configuring ehcache from InputStream");

        Configuration configuration = new Configuration();
        try {
            InputStream translatedInputStream = translateSystemProperties(inputStream);
            final SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
            final BeanHandler handler = new BeanHandler(configuration);
            parser.parse(translatedInputStream, handler);
        } catch (Exception e) {
            throw new CacheException("Error configuring from input stream. Initial cause was " + e.getMessage(), e);
        }
        configuration.setSource(ConfigurationSource.getConfigurationSource(inputStream));
        return configuration;
    }

    /**
     * Configures a bean from an XML file in the classpath.
     */
    public static Configuration parseConfiguration() throws CacheException {
        ClassLoader standardClassloader = ClassLoaderUtil.getStandardClassLoader();
        URL url = null;
        if (standardClassloader != null) {
            url = standardClassloader.getResource(DEFAULT_CLASSPATH_CONFIGURATION_FILE);
        }
        if (url == null) {
            url = ConfigurationFactory.class.getResource(DEFAULT_CLASSPATH_CONFIGURATION_FILE);
        }
        if (url != null) {
            LOG.debug("Configuring ehcache from ehcache.xml found in the classpath: " + url);
        } else {
            url = ConfigurationFactory.class.getResource(FAILSAFE_CLASSPATH_CONFIGURATION_FILE);

            LOG.warn("No configuration found. Configuring ehcache from ehcache-failsafe.xml "
                    + " found in the classpath: {}", url);

        }
        Configuration configuration = parseConfiguration(url);
        configuration.setSource(ConfigurationSource.getConfigurationSource());
        return configuration;
    }
}

<property name="configLocation" value="classpath:config/ehcache.xml"/>

private Resource configLocation;

Resource resource = appContext.getResource("file:c:\\testing.txt");

Resource resource = appContext.getResource("url:http://www.yourdomain.com/testing.txt");

Resource resource = appContext.getResource("classpath:com/mkyong/common/testing.txt");

package org.springframework.core.io;

import org.springframework.util.ResourceUtils;

/**
 * Strategy interface for loading resources (e.. class path or file system
 * resources). An {@link org.springframework.context.ApplicationContext}
 * is required to provide this functionality, plus extended
 * {@link org.springframework.core.io.support.ResourcePatternResolver} support.
 *
 * <p>{@link DefaultResourceLoader} is a standalone implementation that is
 * usable outside an ApplicationContext, also used by {@link ResourceEditor}.
 *
 * <p>Bean properties of type Resource and Resource array can be populated
 * from Strings when running in an ApplicationContext, using the particular
 * context's resource loading strategy.
 *
 * @see Resource
 * @see org.springframework.core.io.support.ResourcePatternResolver
 * @see org.springframework.context.ApplicationContext
 * @see org.springframework.context.ResourceLoaderAware
 */
public interface ResourceLoader {

	/** Pseudo URL prefix for loading from the class path: "classpath:" */
	String CLASSPATH_URL_PREFIX = ResourceUtils.CLASSPATH_URL_PREFIX;


	/**
	 * Return a Resource handle for the specified resource.
	 * The handle should always be a reusable resource descriptor,
	 * allowing for multiple {@link Resource#getInputStream()} calls.
	 * <p><ul>
	 * <li>Must support fully qualified URLs, e.g. "file:C:/test.dat".
	 * <li>Must support classpath pseudo-URLs, e.g. "classpath:test.dat".
	 * <li>Should support relative file paths, e.g. "WEB-INF/test.dat".
	 * (This will be implementation-specific, typically provided by an
	 * ApplicationContext implementation.)
	 * </ul>
	 * <p>Note that a Resource handle does not imply an existing resource;
	 * you need to invoke {@link Resource#exists} to check for existence.
	 * @param location the resource location
	 * @return a corresponding Resource handle
	 * @see #CLASSPATH_URL_PREFIX
	 * @see org.springframework.core.io.Resource#exists
	 * @see org.springframework.core.io.Resource#getInputStream
	 */
	Resource getResource(String location);

	/**
	 * Expose the ClassLoader used by this ResourceLoader.
	 * <p>Clients which need to access the ClassLoader directly can do so
	 * in a uniform manner with the ResourceLoader, rather than relying
	 * on the thread context ClassLoader.
	 * @return the ClassLoader (only {@code null} if even the system
	 * ClassLoader isn't accessible)
	 * @see org.springframework.util.ClassUtils#getDefaultClassLoader()
	 */
	ClassLoader getClassLoader();

}

package org.springframework.core.io;

import java.net.MalformedURLException;
import java.net.URL;

import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;

/**
 * Default implementation of the {@link ResourceLoader} interface.
 * Used by {@link ResourceEditor}, and serves as base class for
 * {@link org.springframework.context.support.AbstractApplicationContext}.
 * Can also be used standalone.
 *
 * <p>Will return a {@link UrlResource} if the location value is a URL,
 * and a {@link ClassPathResource} if it is a non-URL path or a
 * "classpath:" pseudo-URL.
 *
 * @see FileSystemResourceLoader
 * @see org.springframework.context.support.ClassPathXmlApplicationContext
 */
public class DefaultResourceLoader implements ResourceLoader {

	private ClassLoader classLoader;


	/**
	 * Create a new DefaultResourceLoader.
	 * <p>ClassLoader access will happen using the thread context class loader
	 * at the time of this ResourceLoader's initialization.
	 * @see java.lang.Thread#getContextClassLoader()
	 */
	public DefaultResourceLoader() {
		this.classLoader = ClassUtils.getDefaultClassLoader();
	}

	/**
	 * Create a new DefaultResourceLoader.
	 * @param classLoader the ClassLoader to load class path resources with, or {@code null}
	 * for using the thread context class loader at the time of actual resource access
	 */
	public DefaultResourceLoader(ClassLoader classLoader) {
		this.classLoader = classLoader;
	}


	/**
	 * Specify the ClassLoader to load class path resources with, or {@code null}
	 * for using the thread context class loader at the time of actual resource access.
	 * <p>The default is that ClassLoader access will happen using the thread context
	 * class loader at the time of this ResourceLoader's initialization.
	 */
	public void setClassLoader(ClassLoader classLoader) {
		this.classLoader = classLoader;
	}

	/**
	 * Return the ClassLoader to load class path resources with.
	 * <p>Will get passed to ClassPathResource's constructor for all
	 * ClassPathResource objects created by this resource loader.
	 * @see ClassPathResource
	 */
	@Override
	public ClassLoader getClassLoader() {
		return (this.classLoader != null ? this.classLoader : ClassUtils.getDefaultClassLoader());
	}


	@Override
	public Resource getResource(String location) {
		Assert.notNull(location, "Location must not be null");
		if (location.startsWith("/")) {
			return getResourceByPath(location);
		}
		else if (location.startsWith(CLASSPATH_URL_PREFIX)) {
			return new ClassPathResource(location.substring(CLASSPATH_URL_PREFIX.length()), getClassLoader());
		}
		else {
			try {
				// Try to parse the location as a URL...
				URL url = new URL(location);
				return new UrlResource(url);
			}
			catch (MalformedURLException ex) {
				// No URL -> resolve as resource path.
				return getResourceByPath(location);
			}
		}
	}

	/**
	 * Return a Resource handle for the resource at the given path.
	 * <p>The default implementation supports class path locations. This should
	 * be appropriate for standalone implementations but can be overridden,
	 * e.g. for implementations targeted at a Servlet container.
	 * @param path the path to the resource
	 * @return the corresponding Resource handle
	 * @see ClassPathResource
	 * @see org.springframework.context.support.FileSystemXmlApplicationContext#getResourceByPath
	 * @see org.springframework.web.context.support.XmlWebApplicationContext#getResourceByPath
	 */
	protected Resource getResourceByPath(String path) {
		return new ClassPathContextResource(path, getClassLoader());
	}


	/**
	 * ClassPathResource that explicitly expresses a context-relative path
	 * through implementing the ContextResource interface.
	 */
	protected static class ClassPathContextResource extends ClassPathResource implements ContextResource {

		public ClassPathContextResource(String path, ClassLoader classLoader) {
			super(path, classLoader);
		}

		@Override
		public String getPathWithinContext() {
			return getPath();
		}

		@Override
		public Resource createRelative(String relativePath) {
			String pathToUse = StringUtils.applyRelativePath(getPath(), relativePath);
			return new ClassPathContextResource(pathToUse, getClassLoader());
		}
	}

}

@Override
public Resource getResource(String location) {
	Assert.notNull(location, "Location must not be null");
	if (location.startsWith("/")) {
		return getResourceByPath(location);
	}
	else if (location.startsWith(CLASSPATH_URL_PREFIX)) {
		return new ClassPathResource(location.substring(CLASSPATH_URL_PREFIX.length()), getClassLoader());
	}
	else {
		try {
			// Try to parse the location as a URL...
			URL url = new URL(location);
			return new UrlResource(url);
		}
		catch (MalformedURLException ex) {
			// No URL -> resolve as resource path.
			return getResourceByPath(location);
		}
	}
}

package org.springframework.core.io;

import java.io.IOException;
import java.io.InputStream;

/**
 * Simple interface for objects that are sources for an {@link InputStream}.
 *
 * <p>This is the base interface for Spring's more extensive {@link Resource} interface.
 *
 * <p>For single-use streams, {@link InputStreamResource} can be used for any
 * given {@code InputStream}. Spring's {@link ByteArrayResource} or any
 * file-based {@code Resource} implementation can be used as a concrete
 * instance, allowing one to read the underlying content stream multiple times.
 * This makes this interface useful as an abstract content source for mail
 * attachments, for example.
 *
 */
public interface InputStreamSource {

	/**
	 * Return an {@link InputStream}.
	 * <p>It is expected that each call creates a <i>fresh</i> stream.
	 * <p>This requirement is particularly important when you consider an API such
	 * as JavaMail, which needs to be able to read the stream multiple times when
	 * creating mail attachments. For such a use case, it is <i>required</i>
	 * that each {@code getInputStream()} call returns a fresh stream.
	 * @return the input stream for the underlying resource (must not be {@code null})
	 * @throws IOException if the stream could not be opened
	 * @see org.springframework.mail.javamail.MimeMessageHelper#addAttachment(String, InputStreamSource)
	 */
	InputStream getInputStream() throws IOException;
}


package org.springframework.core.io;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URL;

/**
 * Interface for a resource descriptor that abstracts from the actual
 * type of underlying resource, such as a file or class path resource.
 *
 * <p>An InputStream can be opened for every resource if it exists in
 * physical form, but a URL or File handle can just be returned for
 * certain resources. The actual behavior is implementation-specific.
 *
 */
public interface Resource extends InputStreamSource {

	boolean exists();

	boolean isReadable();

	boolean isOpen();

	URL getURL() throws IOException;

	URI getURI() throws IOException;

	File getFile() throws IOException;

	long contentLength() throws IOException;

	long lastModified() throws IOException;

	Resource createRelative(String relativePath) throws IOException;

	String getFilename();

	String getDescription();
}

package org.springframework.core.io;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

/**
 * {@link Resource} implementation for class path resources.
 * Uses either a given ClassLoader or a given Class for loading resources.
 *
 * <p>Supports resolution as {@code java.io.File} if the class path
 * resource resides in the file system, but not for resources in a JAR.
 * Always supports resolution as URL.
 *
 * @see ClassLoader#getResourceAsStream(String)
 * @see Class#getResourceAsStream(String)
 */
public class ClassPathResource extends AbstractFileResolvingResource {

	private final String path;

	private ClassLoader classLoader;

	private Class<?> clazz;


	/**
	 * Create a new {@code ClassPathResource} for {@code ClassLoader} usage.
	 * A leading slash will be removed, as the ClassLoader resource access
	 * methods will not accept it.
	 * <p>The thread context class loader will be used for
	 * loading the resource.
	 * @param path the absolute path within the class path
	 * @see java.lang.ClassLoader#getResourceAsStream(String)
	 * @see org.springframework.util.ClassUtils#getDefaultClassLoader()
	 */
	public ClassPathResource(String path) {
		this(path, (ClassLoader) null);
	}

	/**
	 * Create a new {@code ClassPathResource} for {@code ClassLoader} usage.
	 * A leading slash will be removed, as the ClassLoader resource access
	 * methods will not accept it.
	 * @param path the absolute path within the classpath
	 * @param classLoader the class loader to load the resource with,
	 * or {@code null} for the thread context class loader
	 * @see ClassLoader#getResourceAsStream(String)
	 */
	public ClassPathResource(String path, ClassLoader classLoader) {
		Assert.notNull(path, "Path must not be null");
		String pathToUse = StringUtils.cleanPath(path);
		if (pathToUse.startsWith("/")) {
			pathToUse = pathToUse.substring(1);
		}
		this.path = pathToUse;
		this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());
	}

	/**
	 * Create a new {@code ClassPathResource} for {@code Class} usage.
	 * The path can be relative to the given class, or absolute within
	 * the classpath via a leading slash.
	 * @param path relative or absolute path within the class path
	 * @param clazz the class to load resources with
	 * @see java.lang.Class#getResourceAsStream
	 */
	public ClassPathResource(String path, Class<?> clazz) {
		Assert.notNull(path, "Path must not be null");
		this.path = StringUtils.cleanPath(path);
		this.clazz = clazz;
	}

	/**
	 * Create a new {@code ClassPathResource} with optional {@code ClassLoader}
	 * and {@code Class}. Only for internal usage.
	 * @param path relative or absolute path within the classpath
	 * @param classLoader the class loader to load the resource with, if any
	 * @param clazz the class to load resources with, if any
	 */
	protected ClassPathResource(String path, ClassLoader classLoader, Class<?> clazz) {
		this.path = StringUtils.cleanPath(path);
		this.classLoader = classLoader;
		this.clazz = clazz;
	}


	/**
	 * Return the path for this resource (as resource path within the class path).
	 */
	public final String getPath() {
		return this.path;
	}

	/**
	 * Return the ClassLoader that this resource will be obtained from.
	 */
	public final ClassLoader getClassLoader() {
		return (this.clazz != null ? this.clazz.getClassLoader() : this.classLoader);
	}


	/**
	 * This implementation checks for the resolution of a resource URL.
	 * @see java.lang.ClassLoader#getResource(String)
	 * @see java.lang.Class#getResource(String)
	 */
	@Override
	public boolean exists() {
		return (resolveURL() != null);
	}

	/**
	 * Resolves a URL for the underlying class path resource.
	 * @return the resolved URL, or {@code null} if not resolvable
	 */
	protected URL resolveURL() {
		if (this.clazz != null) {
			return this.clazz.getResource(this.path);
		}
		else if (this.classLoader != null) {
			return this.classLoader.getResource(this.path);
		}
		else {
			return ClassLoader.getSystemResource(this.path);
		}
	}

	/**
	 * This implementation opens an InputStream for the given class path resource.
	 * @see java.lang.ClassLoader#getResourceAsStream(String)
	 * @see java.lang.Class#getResourceAsStream(String)
	 */
	@Override
	public InputStream getInputStream() throws IOException {
		InputStream is;
		if (this.clazz != null) {
			is = this.clazz.getResourceAsStream(this.path);
		}
		else if (this.classLoader != null) {
			is = this.classLoader.getResourceAsStream(this.path);
		}
		else {
			is = ClassLoader.getSystemResourceAsStream(this.path);
		}
		if (is == null) {
			throw new FileNotFoundException(getDescription() + " cannot be opened because it does not exist");
		}
		return is;
	}

	/**
	 * This implementation returns a URL for the underlying class path resource,
	 * if available.
	 * @see java.lang.ClassLoader#getResource(String)
	 * @see java.lang.Class#getResource(String)
	 */
	@Override
	public URL getURL() throws IOException {
		URL url = resolveURL();
		if (url == null) {
			throw new FileNotFoundException(getDescription() + " cannot be resolved to URL because it does not exist");
		}
		return url;
	}

	/**
	 * This implementation creates a ClassPathResource, applying the given path
	 * relative to the path of the underlying resource of this descriptor.
	 * @see org.springframework.util.StringUtils#applyRelativePath(String, String)
	 */
	@Override
	public Resource createRelative(String relativePath) {
		String pathToUse = StringUtils.applyRelativePath(this.path, relativePath);
		return new ClassPathResource(pathToUse, this.classLoader, this.clazz);
	}

	/**
	 * This implementation returns the name of the file that this class path
	 * resource refers to.
	 * @see org.springframework.util.StringUtils#getFilename(String)
	 */
	@Override
	public String getFilename() {
		return StringUtils.getFilename(this.path);
	}

	/**
	 * This implementation returns a description that includes the class path location.
	 */
	@Override
	public String getDescription() {
		StringBuilder builder = new StringBuilder("class path resource [");
		String pathToUse = path;
		if (this.clazz != null && !pathToUse.startsWith("/")) {
			builder.append(ClassUtils.classPackageAsResourcePath(this.clazz));
			builder.append('/');
		}
		if (pathToUse.startsWith("/")) {
			pathToUse = pathToUse.substring(1);
		}
		builder.append(pathToUse);
		builder.append(']');
		return builder.toString();
	}

	/**
	 * This implementation compares the underlying class path locations.
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		if (obj instanceof ClassPathResource) {
			ClassPathResource otherRes = (ClassPathResource) obj;
			return (this.path.equals(otherRes.path) &&
					ObjectUtils.nullSafeEquals(this.classLoader, otherRes.classLoader) &&
					ObjectUtils.nullSafeEquals(this.clazz, otherRes.clazz));
		}
		return false;
	}

	/**
	 * This implementation returns the hash code of the underlying
	 * class path location.
	 */
	@Override
	public int hashCode() {
		return this.path.hashCode();
	}

}