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() {<FILL_FUNCTION_BODY>}

    /**
     * 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();
    }

}

        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);
        }
    
<methods>public non-sealed void <init>() ,public long contentLength() throws java.io.IOException,public boolean exists() ,public java.io.File getFile() throws java.io.IOException,public boolean isReadable() ,public long lastModified() throws java.io.IOException<variables>