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;
27 * Visitor that creates links between required and provided interfaces as
28 * described by the edges in the graph. Specically it links together (1)
29 * required and provided interfaces of internal component of a container and
30 * (2) the providers of externally required interfaces and internal required
33 * @author Erik Brakkee
35 public class LinkVisitor implements Visitor {
39 * @param aEdge DOCUMENT ME!
42 public void visitEdge(Edge aEdge) {
43 Node from = aEdge.getFrom();
44 Node to = aEdge.getTo();
46 if (from instanceof RequiredInterfaceNode) {
47 RequiredInterfaceNode required = (RequiredInterfaceNode) from;
49 if (to instanceof ProvidedInterfaceNode) {
50 ProvidedInterfaceNode provided = (ProvidedInterfaceNode) to;
51 required.getRequired().setProvider(provided.getProvided());
52 } else if (to instanceof ExternalRequiredInterfaceNode) {
53 ExternalRequiredInterfaceNode external = (ExternalRequiredInterfaceNode) to;
54 ProvidedInterface provider = external.getRequired()
57 if ((provider == null) && !required.getRequired().isOptional()) {
58 throw new SystemAssemblyException("Mandatory interface '"
59 + from + "' is not provided.");
62 if (provider != null) {
63 required.getRequired().setProvider(provider);
66 } else if (from instanceof ProvidedInterfaceNode) {
67 // Provided interfaces can only be published after the system has
75 * @param aNode DOCUMENT ME!
78 public void visitNode(Node aNode) {