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.ProvidedInterface;
19 import org.wamblee.system.core.SystemAssemblyException;
20 import org.wamblee.system.graph.DefaultEdge;
21 import org.wamblee.system.graph.Edge;
22 import org.wamblee.system.graph.Node;
23 import org.wamblee.system.graph.Visitor;
26 * Visitor that creates links between required and provided interfaces as
27 * described by the edges in the graph.
29 * @author Erik Brakkee
32 public class LinkVisitor implements Visitor {
35 public void visitEdge(Edge aEdge) {
36 Node from = aEdge.getFrom();
37 Node to = aEdge.getTo();
38 if (from instanceof RequiredInterfaceNode) {
39 RequiredInterfaceNode required = (RequiredInterfaceNode) from;
40 if (to instanceof ProvidedInterfaceNode) {
42 ProvidedInterfaceNode provided = (ProvidedInterfaceNode) to;
43 required.getRequired().setProvider(provided.getProvided());
45 } else if (to instanceof ExternalRequiredInterfaceNode) {
46 ExternalRequiredInterfaceNode external = (ExternalRequiredInterfaceNode) to;
47 ProvidedInterface provider = external.getRequired()
49 if (provider == null && !required.getRequired().isOptional()) {
50 throw new SystemAssemblyException("Mandatory interface '"
51 + from + "' is not provided.");
53 if ( provider != null ) {
54 required.getRequired().setProvider(provider);
57 } else if (from instanceof ProvidedInterfaceNode) {
58 // Provided interfaces can only be published after the system has
64 public void visitNode(Node aNode) {