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// Copyright 2014 Google Inc. 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.
// All Rights Reserved.
package com.google.devtools.build.lib.graph;
import java.io.PrintWriter;
/**
* <p> An implementation of GraphVisitor for displaying graphs in dot
* format. </p>
*/
public class DotOutputVisitor<T> implements GraphVisitor<T> {
/**
* Constructs a dot output visitor.
*
* The visitor writes to writer 'out', and rendering node labels as
* strings using the specified displayer, 'disp'.
*/
public DotOutputVisitor(PrintWriter out, LabelSerializer<T> disp) {
// assert disp != null;
// assert out != null;
this.out = out;
this.disp = disp;
}
private final LabelSerializer<T> disp;
protected final PrintWriter out;
private boolean closeAtEnd = false;
@Override
public void beginVisit() {
out.println("digraph mygraph {");
}
@Override
public void endVisit() {
out.println("}");
out.flush();
if (closeAtEnd) {
out.close();
}
}
@Override
public void visitEdge(Node<T> lhs, Node<T> rhs) {
String s_lhs = disp.serialize(lhs);
String s_rhs = disp.serialize(rhs);
out.println("\"" + s_lhs + "\" -> \"" + s_rhs + "\"");
}
@Override
public void visitNode(Node<T> node) {
out.println("\"" + disp.serialize(node) + "\"");
}
/******************************************************************
* *
* Factories *
* *
******************************************************************/
/**
* Create a DotOutputVisitor for output to a writer; uses default
* LabelSerializer.
*/
public static <U> DotOutputVisitor<U> create(PrintWriter writer) {
return new DotOutputVisitor<U>(writer, new DefaultLabelSerializer<U>());
}
/**
* The default implementation of LabelSerializer simply serializes
* each node using its toString method.
*/
private static class DefaultLabelSerializer<T> implements LabelSerializer<T> {
@Override
public String serialize(Node<T> node) {
return node.getLabel().toString();
}
}
}
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