added sources for Slick

Former-commit-id: 1647fa32ef6894bd7db44f741f07c2f4dcdf9054
Former-commit-id: 0e5810dcfbe1fd59b13e7cabe9f1e93c5542da2d

lib/slick-source/org/newdawn/slick/util/ResourceLoader.java

@@ -0,0 +1,120 @@
+package org.newdawn.slick.util;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.ArrayList;
+
+/**
+ * A simple wrapper around resource loading should anyone decide to change
+ * their minds how this is meant to work in the future.
+ * 
+ * @author Kevin Glass
+ */
+public class ResourceLoader {
+	/** The list of locations to be searched */
+	private static ArrayList locations = new ArrayList();
+	
+	static {
+		locations.add(new ClasspathLocation());
+		locations.add(new FileSystemLocation(new File(".")));
+	}
+	
+	/**
+	 * Add a location that will be searched for resources
+	 * 
+	 * @param location The location that will be searched for resoruces
+	 */
+	public static void addResourceLocation(ResourceLocation location) {
+		locations.add(location);
+	}
+	
+	/**
+	 * Remove a location that will be no longer be searched for resources
+	 * 
+	 * @param location The location that will be removed from the search list
+	 */
+	public static void removeResourceLocation(ResourceLocation location) {
+		locations.remove(location);
+	}
+	
+	/**
+	 * Remove all the locations, no resources will be found until
+	 * new locations have been added
+	 */
+	public static void removeAllResourceLocations() {
+		locations.clear();
+	}
+	
+	/**
+	 * Get a resource
+	 * 
+	 * @param ref The reference to the resource to retrieve
+	 * @return A stream from which the resource can be read
+	 */
+	public static InputStream getResourceAsStream(String ref) {
+		InputStream in = null;
+		
+		for (int i=0;i<locations.size();i++) {
+			ResourceLocation location = (ResourceLocation) locations.get(i);
+			in = location.getResourceAsStream(ref);
+			if (in != null) {
+				break;
+			}
+		}
+		
+		if (in == null)
+		{
+			throw new RuntimeException("Resource not found: "+ref);
+		}
+			
+		return new BufferedInputStream(in);
+	}
+	
+	/**
+	 * Check if a resource is available from any given resource loader
+	 * 
+	 * @param ref A reference to the resource that should be checked
+	 * @return True if the resource can be located
+	 */
+	public static boolean resourceExists(String ref) {
+		URL url = null;
+		
+		for (int i=0;i<locations.size();i++) {
+			ResourceLocation location = (ResourceLocation) locations.get(i);
+			url = location.getResource(ref);
+			if (url != null) {
+				return true;
+			}
+		}
+		
+		return false;
+	}
+	
+	/**
+	 * Get a resource as a URL
+	 * 
+	 * @param ref The reference to the resource to retrieve
+	 * @return A URL from which the resource can be read
+	 */
+	public static URL getResource(String ref) {
+
+		URL url = null;
+		
+		for (int i=0;i<locations.size();i++) {
+			ResourceLocation location = (ResourceLocation) locations.get(i);
+			url = location.getResource(ref);
+			if (url != null) {
+				break;
+			}
+		}
+		
+		if (url == null)
+		{
+			throw new RuntimeException("Resource not found: "+ref);
+		}
+			
+		return url;
+	}
+}