first pass at the 0.4 architecture. not ready for use or integration yet, but is functional with some manual build/config work

apps/routerconsole/java/src/net/i2p/router/web/ContextHelper.java

@@ -0,0 +1,24 @@
+package net.i2p.router.web;
+
+import java.util.List;
+import net.i2p.data.Hash;
+import net.i2p.router.RouterContext;
+
+class ContextHelper {
+    public static RouterContext getContext(String contextId) {
+        List contexts = RouterContext.listContexts();
+        if ( (contexts == null) || (contexts.size() <= 0) ) 
+            throw new IllegalStateException("No contexts?  wtf");
+        if ( (contextId == null) || (contextId.trim().length() <= 0) )
+            return (RouterContext)contexts.get(0);
+        for (int i = 0; i < contexts.size(); i++) {
+            RouterContext context = (RouterContext)contexts.get(i);
+            Hash hash = context.routerHash();
+            if (hash == null) continue;
+            if (hash.toBase64().startsWith(contextId))
+                return context;
+        }
+        // not found, so just give them the first we can find
+        return (RouterContext)contexts.get(0);
+    }
+}