2003/12/16 22:15:41

[org.ibex.core.git] / src / org / xwt / Res.java

diff --git a/src/org/xwt/Res.java b/src/org/xwt/Res.java
index c55f1ac..5639080 100644 (file)
--- a/src/org/xwt/Res.java
+++ b/src/org/xwt/Res.java
@@ -13,6 +13,15 @@ import org.bouncycastle.util.encoders.Base64;
 /** Base class for XWT resources */
 public abstract class Res extends JS {
 
+    /** return a resource for a given url */
+    public static final Res fromURL(String url) throws JSExn {
+        if (url.startsWith("http://")) return new Res.HTTP(url);
+        else if (url.startsWith("https://")) return new Res.HTTP(url);
+        else if (url.startsWith("data:")) return new Res.ByteArray(Base64.decode(url.substring(5)), null);
+        else if (url.startsWith("utf8:")) return new Res.ByteArray(url.substring(5).getBytes(), null);
+        throw new JSExn("invalid resource specifier " + url);
+    }
+
     // Base Class //////////////////////////////////////////////////////////////////////
 
     public String typeName() { return "resource"; }
@@ -27,7 +36,7 @@ public abstract class Res extends JS {
 
     public Res addExtension(String extension) { return new Ref(this, extension); }
 
-    public Object get(Object key) {
+    public Object get(Object key) throws JSExn {
         if ("".equals(key)) {
             try {
                 Template t = Template.getTemplate(addExtension(".xwt"));
@@ -177,6 +186,29 @@ public abstract class Res extends JS {
         public InputStream getInputStream(String path) throws IOException { return parent.getInputStream("/" + key + path); }
     }
 
+    /** provides redirection of a specified key */
+    public static class Graft extends Res {
+        Res graftee;
+        Object replaced_key, replaced_val;
+        Graft(Res graftee, Object key, Object val) { this.graftee = graftee; this.replaced_key = key; this.replaced_val = val; }
+        public boolean equals(Object o) { return this == o || graftee.equals(o); }
+        public int hashCode() { return graftee.hashCode(); }
+        public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
+        public Object get(Object key) throws JSExn { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
+        public Object callMethod(Object name, Object a, Object b, Object c, Object[] rest, int nargs) throws JSExn {
+            if (replaced_key.equals(name)) {
+                if (replaced_val instanceof JS) return ((JS)replaced_val).call(a, b, c, rest, nargs);
+                else throw new JSExn("attempted to call non-function (class="+replaced_val.getClass()+")");
+            } else {
+                return graftee.callMethod(name, a, b, c, rest, nargs);
+            }
+        }
+        public Number coerceToNumber() { return graftee.coerceToNumber(); }
+        public String coerceToString() { return graftee.coerceToString(); }
+        public boolean coerceToBoolean() { return graftee.coerceToBoolean(); }
+        public String typeName() { return graftee.typeName(); }
+    }
+
     /** shadow resource which replaces the graft */
     public static class ProgressWatcher extends Res {
         final Res watchee;