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.apache.commons.logging.Log;
19 import org.apache.commons.logging.LogFactory;
21 import org.wamblee.system.core.SystemAssemblyException;
22 import org.wamblee.system.graph.Edge;
23 import org.wamblee.system.graph.Graph;
24 import org.wamblee.system.graph.Node;
25 import org.wamblee.system.graph.Visitor;
27 import java.util.List;
31 * Visitor that checks whether all required external interfaces of the
32 * container are provided.
34 * @author Erik Brakkee
36 public class CheckExternallyRequiredVisitor implements Visitor {
40 private Log LOG = LogFactory.getLog(CheckExternallyRequiredVisitor.class);
48 * Creates a new CheckExternallyRequiredVisitor object.
50 * @param aGraph DOCUMENT ME!
52 public CheckExternallyRequiredVisitor(Graph aGraph) {
59 * @param aEdge DOCUMENT ME!
62 public void visitEdge(Edge aEdge) {
69 * @param aNode DOCUMENT ME!
72 public void visitNode(Node aNode) {
73 if (aNode instanceof ExternalRequiredInterfaceNode) {
74 ExternalRequiredInterfaceNode required = (ExternalRequiredInterfaceNode) aNode;
76 if (!required.getRequired().isOptional()
77 && (required.getRequired().getProvider() == null)) {
78 throw new SystemAssemblyException(aNode
79 + ": External required interface is not provided");
82 List<Edge> edges = graph.findIncoming(aNode);
84 if (edges.isEmpty()) {
85 LOG.warn(aNode + ": Superfluous required interface");
88 for (Edge edge : edges) {
89 Node from = edge.getFrom();
90 assert from instanceof RequiredInterfaceNode;
92 RequiredInterfaceNode reqNode = (RequiredInterfaceNode) from;
94 if (!reqNode.getRequired().isOptional()
95 && required.getRequired().isOptional()) {
96 throw new SystemAssemblyException(aNode
97 + ": externally required interface is optional but a corresponding internal required interface is mandatory: "