2 * Copyright 2008 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.system.graph.component;
18 import org.wamblee.system.core.SystemAssemblyException;
19 import org.wamblee.system.graph.Edge;
20 import org.wamblee.system.graph.Node;
21 import org.wamblee.system.graph.Visitor;
24 * Visitor that checks externally required services:
29 * @author Erik Brakkee
32 public class CheckExternallyRequiredVisitor implements Visitor {
34 public CheckExternallyRequiredVisitor() {
39 public void visitEdge(Edge aEdge) {
44 public void visitNode(Node aNode) {
45 if ( aNode instanceof ExternalRequiredInterfaceNode) {
46 ExternalRequiredInterfaceNode required = (ExternalRequiredInterfaceNode) aNode;
47 if ( !required.getRequired().isOptional() && required.getRequired().getProvider() == null) {
48 throw new SystemAssemblyException(aNode + ": External required interface is not provided");