com.espertech.esper.common.internal.util

Class ResourceLoader

java.lang.Object

com.espertech.esper.common.internal.util.ResourceLoader

public class ResourceLoader
extends Object

Utility class for loading or resolving external resources via URL and class path.

Constructor Summary

Constructors

Constructor and Description
ResourceLoader()

Method Summary

Modifier and Type	Method and Description
static URL	getClasspathResourceAsURL(String resourceName, String resource, ClassLoader classLoader) Returns an URL from an application resource in the classpath.
static URL	resolveClassPathOrURLResource(String resourceName, String urlOrClasspathResource, ClassLoader classLoader) Resolve a resource into a URL using the URL string or classpath-relative filename and using a name for any exceptions thrown.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ResourceLoader

public ResourceLoader()

Method Detail

resolveClassPathOrURLResource

public static URL resolveClassPathOrURLResource(String resourceName,
                                                String urlOrClasspathResource,
                                                ClassLoader classLoader)
                                         throws FileNotFoundException

Resolve a resource into a URL using the URL string or classpath-relative filename and using a name for any exceptions thrown.

Parameters:

resourceName - is the name for use in exceptions

urlOrClasspathResource - is a URL string or classpath-relative filename

classLoader - class loader

Returns:

URL or null if resolution was unsuccessful

Throws:

FileNotFoundException - resource not found

getClasspathResourceAsURL

public static URL getClasspathResourceAsURL(String resourceName,
                                            String resource,
                                            ClassLoader classLoader)
                                     throws FileNotFoundException

Returns an URL from an application resource in the classpath.

The method first removes the '/' character from the resource name if the first character is '/'.

The lookup order is as follows:

If a thread context class loader exists, use Thread.currentThread().getResourceAsStream to obtain an InputStream.

If no input stream was returned, use the Configuration.class.getResourceAsStream. to obtain an InputStream.

If no input stream was returned, use the Configuration.class.getClassLoader().getResourceAsStream. to obtain an InputStream.

If no input stream was returned, throw an Exception.

Parameters:

resourceName - is the name for use in exceptions

resource - is the classpath-relative filename to resolve into a URL

classLoader - class loader

Returns:

URL for resource

Throws:

FileNotFoundException - resource not found