Now basing the implementation on a component graph.

[utils] / system / general / src / main / java / org / wamblee / system / graph / component / CheckExternallyRequiredVisitor.java

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
new file mode 100644 (file)
index 0000000..025608a
--- /dev/null
+++ b/system/general/src/main/java/org/wamblee/system/graph/component/CheckExternallyRequiredVisitor.java
@@ -0,0 +1,53 @@
+/*
+ * 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.wamblee.system.core.SystemAssemblyException;
+import org.wamblee.system.graph.Edge;
+import org.wamblee.system.graph.Node;
+import org.wamblee.system.graph.Visitor;
+
+/**
+ * Visitor that checks externally required services: 
+ * <ul>
+ *   <li>
+ * </ul>
+ * 
+ * @author Erik Brakkee
+ *
+ */
+public class CheckExternallyRequiredVisitor implements Visitor {
+    
+    public CheckExternallyRequiredVisitor() { 
+        // Empty.
+    }
+
+    @Override
+    public void visitEdge(Edge aEdge) {
+        // Empty.
+    }
+
+    @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");
+            }
+        }
+    }
+
+}