Java example source code file (GraphvizGrapher.java)

This example Java source code file (GraphvizGrapher.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

graphvizedge, graphvizgrapher, graphviznode, inject, list, map, member, namefactory, nodeid, override, portidfactory, provider, reflection, string, stringbuilder, util

The GraphvizGrapher.java Java example source code

/**
 * Copyright (C) 2008 Google Inc.
 *
 * 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 com.google.inject.grapher.graphviz;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.inject.Inject;
import com.google.inject.Key;
import com.google.inject.grapher.AbstractInjectorGrapher;
import com.google.inject.grapher.BindingEdge;
import com.google.inject.grapher.DependencyEdge;
import com.google.inject.grapher.ImplementationNode;
import com.google.inject.grapher.InstanceNode;
import com.google.inject.grapher.InterfaceNode;
import com.google.inject.grapher.NameFactory;
import com.google.inject.grapher.NodeId;
import com.google.inject.spi.InjectionPoint;
import java.io.PrintWriter;
import java.lang.reflect.Member;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * {@link com.google.inject.grapher.InjectorGrapher} implementation that writes out a Graphviz DOT
 * file of the graph. Dependencies are bound in {@link GraphvizModule}.
 * <p>
 * Specify the {@link PrintWriter} to output to with {@link #setOut(PrintWriter)}.
 *
 * @author phopkins@gmail.com (Pete Hopkins)
 * @since 4.0
 */
public class GraphvizGrapher extends AbstractInjectorGrapher {
  private final Map<NodeId, GraphvizNode> nodes = Maps.newHashMap();
  private final List<GraphvizEdge> edges = Lists.newArrayList();
  private final NameFactory nameFactory;
  private final PortIdFactory portIdFactory;

  private PrintWriter out;
  private String rankdir = "TB";

  @Inject GraphvizGrapher(@Graphviz NameFactory nameFactory,
      @Graphviz PortIdFactory portIdFactory) {
    this.nameFactory = nameFactory;
    this.portIdFactory = portIdFactory;
  }

  @Override protected void reset() {
    nodes.clear();
    edges.clear();
  }

  public void setOut(PrintWriter out) {
    this.out = out;
  }

  public void setRankdir(String rankdir) {
    this.rankdir = rankdir;
  }

  @Override protected void postProcess() {
    start();
    
    for (GraphvizNode node : nodes.values()) {
      renderNode(node);
    }

    for (GraphvizEdge edge : edges) {
      renderEdge(edge);
    }
    
    finish();
    
    out.flush();
  }

  protected Map<String, String> getGraphAttributes() {
    Map<String, String> attrs = Maps.newHashMap();
    attrs.put("rankdir", rankdir);
    return attrs;
  }

  protected void start() {
    out.println("digraph injector {");
    
    Map<String, String> attrs = getGraphAttributes();
    out.println("graph " + getAttrString(attrs) + ";");
  }

  protected void finish() {
    out.println("}");
  }

  protected void renderNode(GraphvizNode node) {
    Map<String, String> attrs = getNodeAttributes(node);
    out.println(node.getIdentifier() + " " + getAttrString(attrs));
  }
  
  protected Map<String, String> getNodeAttributes(GraphvizNode node) {
    Map<String, String> attrs = Maps.newHashMap();

    attrs.put("label", getNodeLabel(node));
    // remove most of the margin because the table has internal padding
    attrs.put("margin", "\"0.02,0\"");
    attrs.put("shape", node.getShape().toString());
    attrs.put("style", node.getStyle().toString());
    
    return attrs;
  }

  /**
   * Creates the "label" for a node. This is a string of HTML that defines a
   * table with a heading at the top and (in the case of
   * {@link ImplementationNode}s) rows for each of the member fields.
   */
  protected String getNodeLabel(GraphvizNode node) {
    String cellborder = node.getStyle() == NodeStyle.INVISIBLE ? "1" : "0";
    
    StringBuilder html = new StringBuilder();
    html.append("<");
    html.append("<table cellspacing=\"0\" cellpadding=\"5\" cellborder=\"");
    html.append(cellborder).append("\" border=\"0\">");
    
    html.append("<tr>").append("