X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=system%2Fgeneral%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fsystem%2Fgraph%2Fcomponent%2FLinkVisitor.java;h=79f021c5e34ef63638e0d8407625257d3ca758e5;hb=dec278a67997ea8e85d10662e31548afd8890ed3;hp=088f05856ffdc1d28c90198651345ef55614fd84;hpb=aa78ce0aeaa36871bd926eefa1eabf9cb3254c7a;p=utils

diff --git a/system/general/src/main/java/org/wamblee/system/graph/component/LinkVisitor.java b/system/general/src/main/java/org/wamblee/system/graph/component/LinkVisitor.java
index 088f0585..79f021c5 100644
--- a/system/general/src/main/java/org/wamblee/system/graph/component/LinkVisitor.java
+++ b/system/general/src/main/java/org/wamblee/system/graph/component/LinkVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2008 the original author or authors.
+ * Copyright 2005-2010 the original author or authors.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -12,45 +12,47 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- */
+ */ 
 package org.wamblee.system.graph.component;
 
 import org.wamblee.system.core.ProvidedInterface;
 import org.wamblee.system.core.SystemAssemblyException;
-import org.wamblee.system.graph.DefaultEdge;
 import org.wamblee.system.graph.Edge;
 import org.wamblee.system.graph.Node;
 import org.wamblee.system.graph.Visitor;
 
 /**
  * Visitor that creates links between required and provided interfaces as
- * described by the edges in the graph.
+ * described by the edges in the graph. Specically it links together (1)
+ * required and provided interfaces of internal component of a container and (2)
+ * the providers of externally required interfaces and internal required
+ * interfaces.
  * 
  * @author Erik Brakkee
- * 
  */
 public class LinkVisitor implements Visitor {
-
     @Override
     public void visitEdge(Edge aEdge) {
         Node from = aEdge.getFrom();
         Node to = aEdge.getTo();
+
         if (from instanceof RequiredInterfaceNode) {
             RequiredInterfaceNode required = (RequiredInterfaceNode) from;
-            if (to instanceof ProvidedInterfaceNode) {
 
+            if (to instanceof ProvidedInterfaceNode) {
                 ProvidedInterfaceNode provided = (ProvidedInterfaceNode) to;
                 required.getRequired().setProvider(provided.getProvided());
-
             } else if (to instanceof ExternalRequiredInterfaceNode) {
                 ExternalRequiredInterfaceNode external = (ExternalRequiredInterfaceNode) to;
                 ProvidedInterface provider = external.getRequired()
-                        .getProvider();
-                if (provider == null && !required.getRequired().isOptional()) {
-                    throw new SystemAssemblyException("Mandatory interface '"
-                            + from + "' is not provided.");
+                    .getProvider();
+
+                if ((provider == null) && !required.getRequired().isOptional()) {
+                    throw new SystemAssemblyException("Mandatory interface '" +
+                        from + "' is not provided.");
                 }
-                if ( provider != null ) { 
+
+                if (provider != null) {
                     required.getRequired().setProvider(provider);
                 }
             }
@@ -64,5 +66,4 @@ public class LinkVisitor implements Visitor {
     public void visitNode(Node aNode) {
         // Empty.
     }
-
 }