Author: jkaputin
Date: Wed Sep 28 07:15:43 2005
New Revision: 292189
URL: http://svn.apache.org/viewcvs?rev=292189&view=rev
Log:
Removed '*' and made import statements explicit.
Added:
incubator/woden/java/src/org/apache/woden/internal/util/ObjectRegistry.java
Added:
incubator/woden/java/src/org/apache/woden/internal/util/ObjectRegistry.java
URL:
http://svn.apache.org/viewcvs/incubator/woden/java/src/org/apache/woden/internal/util/ObjectRegistry.java?rev=292189&view=auto
==============================================================================
--- incubator/woden/java/src/org/apache/woden/internal/util/ObjectRegistry.java
(added)
+++ incubator/woden/java/src/org/apache/woden/internal/util/ObjectRegistry.java
Wed Sep 28 07:15:43 2005
@@ -0,0 +1,55 @@
+/*
+ * (c) Copyright IBM Corp 2001, 2005
+ */
+
+package org.apache.woden.internal.util;
+
+import java.util.Hashtable;
+
+/**
+ * The <em>ObjectRegistry</em> is used to do name-to-object reference lookups.
+ * If an <em>ObjectRegistry</em> is passed as a constructor argument, then this
+ * <em>ObjectRegistry</em> will be a cascading registry: when a lookup is
+ * invoked, it will first look in its own table for a name, and if it's not
+ * there, it will cascade to the parent <em>ObjectRegistry</em>.
+ * All registration is always local. [??]
+ *
+ * @author Sanjiva Weerawarana
+ * @author Matthew J. Duftler
+ */
+public class ObjectRegistry {
+ Hashtable reg = new Hashtable ();
+ ObjectRegistry parent = null;
+
+ public ObjectRegistry () {
+ }
+
+ public ObjectRegistry (ObjectRegistry parent) {
+ this.parent = parent;
+ }
+
+ // register an object
+ public void register (String name, Object obj) {
+ reg.put (name, obj);
+ }
+
+ // unregister an object (silent if unknown name)
+ public void unregister (String name) {
+ reg.remove (name);
+ }
+
+ // lookup an object: cascade up if needed
+ public Object lookup (String name) throws IllegalArgumentException {
+ Object obj = reg.get (name);
+
+ if (obj == null && parent != null) {
+ obj = parent.lookup (name);
+ }
+
+ if (obj == null) {
+ throw new IllegalArgumentException ("object '" + name + "' not in
registry");
+ }
+
+ return obj;
+ }
+}
\ No newline at end of file
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