guru.nidi.graphviz.model.Serializer Maven / Gradle / Ivy
/*
* Copyright © 2015 Stefan Niederhauser ([email protected])
*
* 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 guru.nidi.graphviz.model;
import guru.nidi.graphviz.attribute.*;
import java.util.*;
import java.util.Map.Entry;
import java.util.stream.Stream;
class Serializer {
private final MutableGraph graph;
private final StringBuilder str;
Serializer(MutableGraph graph) {
this.graph = graph;
str = new StringBuilder();
}
String serialize() {
toplevelGraph(graph);
return str.toString();
}
private void toplevelGraph(MutableGraph graph) {
final boolean useDir = hasDifferentlyDirectedSubgraphs(graph);
str.append(graph.strict ? "strict " : "").append(graph.directed || useDir ? "digraph " : "graph ");
if (!graph.name.isContentEmpty()) {
str.append(graph.name.serialized()).append(' ');
}
doGraph(graph, useDir);
}
private void subGraph(MutableGraph graph, boolean useDir) {
if (!graph.name.isContentEmpty() || graph.cluster) {
str.append("subgraph ")
.append((graph.cluster ? Label.of("cluster_" + graph.name) : graph.name).serialized())
.append(' ');
}
doGraph(graph, useDir);
}
private void doGraph(MutableGraph graph, boolean useDir) {
str.append("{\n");
if (useDir && graph.graphAttrs.get("dir") == null) {
attributes("edge", Attributes.attr("dir", graph.directed ? "forward" : "none"));
}
graphAttrs(graph);
final List nodes = new ArrayList<>();
final List graphs = new ArrayList<>();
final Collection linkSources = linkedNodes(graph.nodes);
linkSources.addAll(linkedNodes(graph.subgraphs));
for (final LinkSource linkSource : linkSources) {
if (linkSource instanceof MutableNode) {
final MutableNode node = (MutableNode) linkSource;
final int i = indexOfName(nodes, node.name);
if (i < 0) {
nodes.add(node);
} else {
nodes.set(i, node.copy().merge(nodes.get(i)));
}
} else {
graphs.add((MutableGraph) linkSource);
}
}
nodes(graph, nodes);
graphs(graphs, nodes, useDir);
edges(nodes, useDir);
edges(graphs, useDir);
str.append('}');
}
private boolean hasDifferentlyDirectedSubgraphs(MutableGraph graph) {
return Stream.concat(linkedNodes(graph.nodes).stream(), linkedNodes(graph.subgraphs).stream())
.filter(n -> n instanceof MutableGraph)
.map(n -> (MutableGraph) n)
.anyMatch(sub -> sub.directed != graph.directed);
}
private void graphAttrs(MutableGraph graph) {
attributes("graph", graph.graphAttrs);
attributes("node", graph.nodeAttrs);
attributes("edge", graph.linkAttrs);
}
private int indexOfName(List nodes, Label name) {
for (int i = 0; i < nodes.size(); i++) {
if (nodes.get(i).name.equals(name)) {
return i;
}
}
return -1;
}
private void attributes(String name, Attributes attributed) {
if (!attributed.isEmpty()) {
str.append(name);
attrs(attributed);
str.append('\n');
}
}
private Collection linkedNodes(Collection nodes) {
final Set visited = new LinkedHashSet<>();
for (final LinkSource node : nodes) {
linkedNodes(node, visited);
}
return visited;
}
private void linkedNodes(LinkSource linkSource, Set visited) {
if (!visited.contains(linkSource)) {
visited.add(linkSource);
for (final Link link : linkSource.links()) {
linkedNodes(link.to.asLinkSource(), visited);
}
}
}
private void nodes(MutableGraph graph, List nodes) {
for (final MutableNode node : nodes) {
if (!node.attributes.isEmpty()
|| (graph.nodes.contains(node) && node.links.isEmpty() && !isLinked(node, nodes))) {
node(node);
str.append('\n');
}
}
}
private void node(MutableNode node) {
str.append(node.name.serialized());
attrs(node.attributes);
}
private boolean isLinked(MutableNode node, List nodes) {
for (final MutableNode m : nodes) {
for (final Link link : m.links) {
if (isNode(link.to, node)) {
return true;
}
}
}
return false;
}
private boolean isLinked(MutableGraph graph, List linkSources) {
for (final LinkSource linkSource : linkSources) {
for (final Link link : linkSource.links()) {
if (link.to.equals(graph)) {
return true;
}
}
}
return false;
}
private boolean isNode(LinkTarget target, MutableNode node) {
return target == node || (target instanceof ImmutablePortNode && ((ImmutablePortNode) target).node() == node);
}
private void graphs(List graphs, List nodes, boolean useDir) {
for (final MutableGraph graph : graphs) {
if (graph.links.isEmpty() && !isLinked(graph, nodes) && !isLinked(graph, graphs)) {
subGraph(graph, useDir);
str.append('\n');
}
}
}
private void edges(List linkSources, boolean useDir) {
for (final LinkSource linkSource : linkSources) {
for (final Link link : linkSource.links()) {
linkTarget(link.from, useDir);
str.append(graph.directed || useDir ? " -> " : " -- ");
linkTarget(link.to, useDir);
attrs(link.attributes);
str.append('\n');
}
}
}
private void linkTarget(Object linkable, boolean useDir) {
if (linkable instanceof MutableNode) {
str.append(((MutableNode) linkable).name.serialized());
} else if (linkable instanceof ImmutablePortNode) {
port((ImmutablePortNode) linkable);
} else if (linkable instanceof MutableGraph) {
subGraph((MutableGraph) linkable, useDir);
} else {
throw new IllegalStateException("unexpected link target " + linkable);
}
}
private void port(ImmutablePortNode portNode) {
str.append(portNode.name().serialized());
final String record = portNode.port().record();
if (record != null) {
str.append(':').append(SimpleLabel.of(record).serialized());
}
final Compass compass = portNode.port().compass();
if (compass != null) {
str.append(':').append(compass.value);
}
}
private void attrs(Attributes attrs) {
if (!attrs.isEmpty()) {
str.append(" [");
boolean first = true;
for (final Entry attr : attrs) {
if (attr.getValue() != null) {
if (first) {
first = false;
} else {
str.append(',');
}
attr(attr.getKey(), attr.getValue());
}
}
str.append(']');
}
}
private void attr(String key, Object value) {
str.append(SimpleLabel.of(key).serialized())
.append('=')
.append(SimpleLabel.of(value).serialized());
}
}
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