SMACK-286 Made ProviderManager much more configurable.

Separated the reading of provider files from the ProviderManager.  Manager now only manages.  Added ability to add collections of providers to the manager via a ProviderLoader, of which there is one default implementation which loads from the default file format.  Now provider files can be programmatically added at any time.  Also updated the configuration abilities so that a provider file can also be set via VM arg, as well as the smack configuration itself. Introduced Java Util Logging as well.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_4_0@13861 b35dd754-fafc-0310-a699-88a17e54d16e

test-unit/org/jivesoftware/smackx/provider/ProviderConfigTest.java

@@ -0,0 +1,55 @@
+package org.jivesoftware.smackx.provider;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import junit.framework.Assert;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.provider.ExtensionProviderInfo;
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.provider.IQProviderInfo;
+import org.jivesoftware.smack.provider.ProviderFileLoader;
+import org.jivesoftware.smack.provider.ProviderLoader;
+import org.jivesoftware.smack.provider.ProviderManager;
+import org.jivesoftware.smack.util.FileUtils;
+import org.junit.Test;
+import org.xmlpull.v1.XmlPullParser;
+
+public class ProviderConfigTest {
+    
+    @Test
+    public void addGenericLoaderProvider() {
+        ProviderManager.getInstance().addLoader(new ProviderLoader() {
+            
+            @Override
+            public Collection<IQProviderInfo> getIQProviderInfo() {
+                ArrayList<IQProviderInfo> l = new ArrayList<IQProviderInfo>(1);
+                l.add(new IQProviderInfo("provider", "test:provider",  new TestIQProvider()));
+                return l;
+            }
+            
+            @Override
+            public Collection<ExtensionProviderInfo> getExtensionProviderInfo() {
+                return null;
+            }
+        });
+        
+        Assert.assertNotNull(ProviderManager.getInstance().getIQProvider("provider", "test:provider"));
+    }
+    
+    @Test
+    public void addClasspathFileLoaderProvider() throws Exception{
+        ProviderManager.getInstance().addLoader(new ProviderFileLoader(FileUtils.getStreamForUrl("classpath:org/jivesoftware/smackx/provider/test.providers", null)));
+        Assert.assertNotNull(ProviderManager.getInstance().getIQProvider("provider", "test:file_provider"));
+    }
+
+    public static class TestIQProvider implements IQProvider {
+
+        @Override
+        public IQ parseIQ(XmlPullParser parser) throws Exception {
+            return null;
+        }
+        
+    }
+}