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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.component.chain.dependencies.ordering;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Signals that the dependency graph contains cycles. A DOT language
* representation of the cycle is available to help solve the problem (<a
* href="http://graphviz.org/">GraphViz</a>).
*
* @author Tony Vaagenes
*/
@SuppressWarnings("serial")
public class CycleDependenciesException extends RuntimeException {
public Map<String, NameProvider> cycleNodes;
CycleDependenciesException(Map<String, NameProvider> cycleNodes) {
super("The following set of dependencies lead to a cycle:\n"
+ createDotString(cycleNodes));
this.cycleNodes = cycleNodes;
}
private static String createDotString(Map<String, NameProvider> cycleNodes) {
StringBuilder res = new StringBuilder();
res.append("digraph dependencyGraph {\n");
Set<Node> used = new HashSet<>();
for (Node node: cycleNodes.values()) {
if (!node.ready())
node.dotDependenciesString(res, used);
}
res.append("}");
return res.toString();
}
public String dotString() {
return createDotString(cycleNodes);
}
}
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