X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=system%2Fgeneral%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fsystem%2Fgraph%2Fcomponent%2FCheckStartupDependenciesVisitor.java;fp=system%2Fgeneral%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fsystem%2Fgraph%2Fcomponent%2FCheckStartupDependenciesVisitor.java;h=5b50e0925c0b57ce16f3796d2651133a2f9b0ee6;hb=aa78ce0aeaa36871bd926eefa1eabf9cb3254c7a;hp=0000000000000000000000000000000000000000;hpb=436718e7b7ee0bb9f37db496dbde5c011d5f84e3;p=utils

diff --git a/system/general/src/main/java/org/wamblee/system/graph/component/CheckStartupDependenciesVisitor.java b/system/general/src/main/java/org/wamblee/system/graph/component/CheckStartupDependenciesVisitor.java
new file mode 100644
index 00000000..5b50e092
--- /dev/null
+++ b/system/general/src/main/java/org/wamblee/system/graph/component/CheckStartupDependenciesVisitor.java
@@ -0,0 +1,57 @@
+/*
+ * 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 java.util.ArrayList;
+import java.util.List;
+
+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;
+
+public class CheckStartupDependenciesVisitor implements Visitor {
+    
+    private Graph _graph; 
+    private List<Node> _available; 
+    
+    public CheckStartupDependenciesVisitor(Graph aGraph) { 
+        _graph = aGraph; 
+        _available = new ArrayList<Node>();
+    }
+
+    @Override
+    public void visitEdge(Edge aEdge) {
+        // Empty
+    }
+
+    @Override
+    public void visitNode(Node aNode) {
+        List<Edge> edges = _graph.findOutgoing(aNode);
+        
+        // check dependencies.
+        for (Edge edge: edges) { 
+            Node dep = edge.getTo();
+            if ( !_available.contains(dep)) { 
+                throw new SystemAssemblyException(aNode + ": required dependency '" + dep + "' was not started");
+            }
+        }
+        
+        _available.add(aNode);
+    }
+
+}