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'Databene Formats' is an open source software library for supporting data file and other formats like CSV, fixed width files, XLS, Properties and Regex. It is designed for multithreaded use and high performance.
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/*
 * Copyright (C) 2011-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 org.databene.formats.dot;

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Map;

import org.databene.commons.Encodings;
import org.databene.commons.IOUtil;
import org.databene.commons.StringUtil;
import org.databene.commons.collection.OrderedNameMap;

/**
 * Writes Dot files.
 * Created: 24.05.2014 09:29:45
 * @since 0.8.2
 * @author Volker Bergmann
 */

public class DotWriter {

	public static void persist(DotGraphModel model, OutputStream os) {
		persist(model, os, Encodings.UTF_8);
	}
		
	public static void persist(DotGraphModel model, OutputStream os, String encoding) {
		PrintWriter out = null;
		try {
			out = new PrintWriter(new OutputStreamWriter(os, encoding));
			// header
			out.print(model.isDirected() ? "digraph" : "graph");
			if (!StringUtil.isEmpty(model.getName()))
				out.print(" " + model.getName());
			out.println(" {");
			
			// graph attributes
			new AttributesWriter("graph")
				.add("charset", encoding)
				.add("rankdir", model.getRankDir())
				.write(out);
			
			// node attributes
			new AttributesWriter("node")
				.add("shape", model.getNodeShape())
				.add("fontsize", model.getNodeFontSize())
				.add("style", model.getNodeStyle())
				.add("fillcolor", DotUtil.normalizeColor(model.getNodeFillColor()))
				.write(out);
			
			// edge attributes
			new AttributesWriter("edge")
				.add("arrowhead", model.getEdgeArrowHead())
				.add("arrowtail", model.getEdgeArrowTail())
				.add("style", model.getEdgeStyle())
				.write(out);
			
			// persist nodes
			for (int i = 0; i < model.getNodeCount(); i++) {
				Object node = model.getNode(i);
				writeNode(node, model, out);
			}
			
			// persist edges
			for (int i = 0; i < model.getNodeCount(); i++) {
				Object node = model.getNode(i);
				writeEdges(node, model, out);
			}
			
			// end
			out.println("}");
		} catch (UnsupportedEncodingException e) {
			throw new UnsupportedOperationException("Not a supported encoding: " + encoding, e);
		} finally {
			IOUtil.close(out);
		}
	}

	private static void writeNode(Object node, DotGraphModel model, PrintWriter out) {
		out.print("\t" + model.getNodeId(node));
		String label = model.getNodeLabel(node);
		if (label != null)
			label = '"' + label + '"';
		new AttributesWriter()
			.add("label", label)
			.add("fillcolor", DotUtil.normalizeColor(model.getNodeFillColor(node)))
			.write(out);
	}
	
	private static void writeEdges(Object node, DotGraphModel model, PrintWriter out) {
		for (int i = 0; i < model.getEdgeCountOfNode(node); i++) {
			Object edge = model.getEdgeOfNode(node, i);
			writeEdge(node, edge, model, out);
		}
	}

	private static void writeEdge(Object sourceNode, Object edge, DotGraphModel model, PrintWriter out) {
		Object target = model.getTargetNodeOfEdge(sourceNode, edge);
		out.print("\t" + model.getNodeId(sourceNode) + " " + (model.isDirected() ? "->" : "--") + " " + model.getNodeId(target));
		new AttributesWriter()
			.add("arrowhead", model.getEdgeArrowHead(edge))
			.add("headlabel", model.getEdgeHeadLabel(edge))
			.add("arrowtail", model.getEdgeArrowTail(edge))
			.add("taillabel", model.getEdgeTailLabel(edge))
			.add("style", model.getEdgeStyle(edge))
			.write(out);
	}
	
	static class AttributesWriter {
		String label;
		OrderedNameMap