* Rewrote handling of URL based locators to use a shared UrlAssetInfo.

 * The AssetInfo.openStream() must create a new stream each time (required by javadoc/spec)

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8592 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/asset/AssetInfo.java

@@ -66,6 +66,10 @@ public abstract class AssetInfo {
     /**
      * Implementations of this method should return an {@link InputStream}
      * allowing access to the data represented by the {@link AssetKey}.
+     * <p>
+     * Each invocation of this method should return a new stream to the
+     * asset data, starting at the beginning of the file.
+     * 
      * @return The asset data.
      */
     public abstract InputStream openStream();

engine/src/desktop/com/jme3/asset/plugins/ClasspathLocator.java

@@ -32,14 +32,17 @@
 
 package com.jme3.asset.plugins;
 
-import com.jme3.asset.*;
+import com.jme3.asset.AssetInfo;
+import com.jme3.asset.AssetKey;
+import com.jme3.asset.AssetLoadException;
+import com.jme3.asset.AssetLocator;
+import com.jme3.asset.AssetManager;
+import com.jme3.asset.AssetNotFoundException;
 import com.jme3.system.JmeSystem;
 import java.io.File;
 import java.io.IOException;
-import java.io.InputStream;
 import java.net.URISyntaxException;
 import java.net.URL;
-import java.net.URLConnection;
 import java.util.logging.Logger;
 
 /**
@@ -51,25 +54,6 @@ public class ClasspathLocator implements AssetLocator {
     private static final Logger logger = Logger.getLogger(ClasspathLocator.class.getName());
     private String root = "";
 
-    private static class ClasspathAssetInfo extends AssetInfo {
-
-        private URLConnection conn;
-
-        public ClasspathAssetInfo(AssetManager manager, AssetKey key, URLConnection conn){
-            super(manager, key);
-            this.conn = conn;
-        }
-
-        @Override
-        public InputStream openStream() {
-            try{
-                return conn.getInputStream();
-            }catch (IOException ex){
-                return null; // failure..
-            }
-        }
-    }
-
     public ClasspathLocator(){
     }
 
@@ -127,10 +111,11 @@ public class ClasspathLocator implements AssetLocator {
         }
         
         try{
-            URLConnection conn = url.openConnection();
-            conn.setUseCaches(false);
-            return new ClasspathAssetInfo(manager, key, conn);
+            return UrlAssetInfo.create(manager, key, url);
         }catch (IOException ex){
+            // This is different handling than URL locator
+            // since classpath locating would return null at the getResource() 
+            // call, otherwise there's a more critical error...
             throw new AssetLoadException("Failed to read URL " + url, ex);
         }
     }

engine/src/desktop/com/jme3/asset/plugins/UrlAssetInfo.java

@@ -0,0 +1,66 @@
+package com.jme3.asset.plugins;
+
+import com.jme3.asset.AssetInfo;
+import com.jme3.asset.AssetKey;
+import com.jme3.asset.AssetLoadException;
+import com.jme3.asset.AssetManager;
+import com.jme3.asset.AssetNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLConnection;
+
+/**
+ * Handles loading of assets from a URL
+ * 
+ * @author Kirill Vainer
+ */
+public class UrlAssetInfo extends AssetInfo {
+    
+    private URL url;
+    private InputStream in;
+    
+    public static UrlAssetInfo create(AssetManager assetManager, AssetKey key, URL url) throws IOException {
+        // Check if URL can be reached. This will throw
+        // IOException which calling code will handle.
+        URLConnection conn = url.openConnection();
+        conn.setUseCaches(false);
+        InputStream in = conn.getInputStream();
+        
+        // For some reason url cannot be reached?
+        if (in == null){
+            return null;
+        }else{
+            return new UrlAssetInfo(assetManager, key, url, in);
+        }
+    }
+    
+    private UrlAssetInfo(AssetManager assetManager, AssetKey key, URL url, InputStream in) throws IOException {
+        super(assetManager, key);
+        this.url = url;
+        this.in = in;
+    }
+    
+    public boolean hasInitialConnection(){
+        return in != null;
+    }
+    
+    @Override
+    public InputStream openStream() {
+        if (in != null){
+            // Reuse the already existing stream (only once)
+            InputStream in2 = in;
+            in = null;
+            return in2;
+        }else{
+            // Create a new stream for subsequent invocations.
+            try {
+                URLConnection conn = url.openConnection();
+                conn.setUseCaches(false);
+                return conn.getInputStream();
+            } catch (IOException ex) {
+                throw new AssetLoadException("Failed to read URL " + url, ex);
+            }
+        }
+    }
+}

engine/src/desktop/com/jme3/asset/plugins/UrlLocator.java

@@ -53,21 +53,6 @@ public class UrlLocator implements AssetLocator {
     private static final Logger logger = Logger.getLogger(UrlLocator.class.getName());
     private URL root;
 
-    private static class UrlAssetInfo extends AssetInfo {
-
-        private InputStream in;
-
-        public UrlAssetInfo(AssetManager manager, AssetKey key, InputStream in){
-            super(manager, key);
-            this.in = in;
-        }
-
-        @Override
-        public InputStream openStream() {
-            return in;
-        }
-    }
-
     public void setRootPath(String rootPath) {
         try {
             this.root = new URL(rootPath);
@@ -78,22 +63,9 @@ public class UrlLocator implements AssetLocator {
 
     public AssetInfo locate(AssetManager manager, AssetKey key) {
         String name = key.getName();
-        
         try{
             URL url = new URL(root, name);
-            URLConnection conn = url.openConnection();
-            conn.setUseCaches(false);
-            conn.setDoOutput(false);
-            InputStream in;
-            try {
-                in = conn.getInputStream();
-                if (in == null)
-                    return null;
-            } catch (FileNotFoundException ex){
-                return null;
-            }
-            
-            return new UrlAssetInfo(manager, key, in);
+            return UrlAssetInfo.create(manager, key, url);
         }catch (IOException ex){
             logger.log(Level.WARNING, "Error while locating " + name, ex);
             return null;