X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=system%2Fgeneral%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fsystem%2Fgraph%2Fcomponent%2FCheckExternallyRequiredVisitor.java;h=86ba2761b51dd110a21b9efcb4e9001e146d82d3;hb=8de36ff0206c996baf3ee4adc3e2293b12ff5f39;hp=9e412b6fdbacbb5b3f4e8de6cb4feb1e63bea8b9;hpb=9bc96feb1a8b20fdb87edbfca54297e206229112;p=utils

diff --git a/system/general/src/main/java/org/wamblee/system/graph/component/CheckExternallyRequiredVisitor.java b/system/general/src/main/java/org/wamblee/system/graph/component/CheckExternallyRequiredVisitor.java
index 9e412b6f..86ba2761 100644
--- a/system/general/src/main/java/org/wamblee/system/graph/component/CheckExternallyRequiredVisitor.java
+++ b/system/general/src/main/java/org/wamblee/system/graph/component/CheckExternallyRequiredVisitor.java
@@ -1,35 +1,48 @@
 /*
  * Copyright 2008 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.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * 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.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import org.wamblee.system.core.SystemAssemblyException;
 import org.wamblee.system.graph.Edge;
+import org.wamblee.system.graph.Graph;
 import org.wamblee.system.graph.Node;
 import org.wamblee.system.graph.Visitor;
 
+import java.util.List;
+
 /**
  * Visitor that checks whether all required external interfaces of the container
- * are provided. 
+ * are provided.
+ * 
  * @author Erik Brakkee
- *
  */
 public class CheckExternallyRequiredVisitor implements Visitor {
-    
-    public CheckExternallyRequiredVisitor() { 
-        // Empty.
+    private Log LOG = LogFactory.getLog(CheckExternallyRequiredVisitor.class);
+
+    private Graph graph;
+
+    /**
+     * Creates a new CheckExternallyRequiredVisitor object.
+     * 
+     */
+    public CheckExternallyRequiredVisitor(Graph aGraph) {
+        graph = aGraph;
     }
 
     @Override
@@ -39,12 +52,35 @@ public class CheckExternallyRequiredVisitor implements Visitor {
 
     @Override
     public void visitNode(Node aNode) {
-        if ( aNode instanceof ExternalRequiredInterfaceNode) { 
-            ExternalRequiredInterfaceNode required = (ExternalRequiredInterfaceNode) aNode; 
-            if ( !required.getRequired().isOptional() && required.getRequired().getProvider() == null) { 
-                throw new SystemAssemblyException(aNode + ": External required interface is not provided");
+        if (aNode instanceof ExternalRequiredInterfaceNode) {
+            ExternalRequiredInterfaceNode required = (ExternalRequiredInterfaceNode) aNode;
+
+            if (!required.getRequired().isOptional() &&
+                (required.getRequired().getProvider() == null)) {
+                throw new SystemAssemblyException(aNode +
+                    ": External required interface is not provided");
+            }
+
+            List<Edge> edges = graph.findIncoming(aNode);
+
+            if (edges.isEmpty()) {
+                LOG.warn(aNode + ": Superfluous required interface");
+            }
+
+            for (Edge edge : edges) {
+                Node from = edge.getFrom();
+                assert from instanceof RequiredInterfaceNode;
+
+                RequiredInterfaceNode reqNode = (RequiredInterfaceNode) from;
+
+                if (!reqNode.getRequired().isOptional() &&
+                    required.getRequired().isOptional()) {
+                    throw new SystemAssemblyException(
+                        aNode +
+                            ": externally required interface is optional but a corresponding internal required interface is mandatory: " +
+                            reqNode);
+                }
             }
         }
     }
-
 }