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Some sanity checking.

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git-svn-id: https://samskivert.googlecode.com/svn/trunk@2561 6335cc39-0255-0410-8fd6-9bcaacd3b74c
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samskivert
2009-05-27 22:19:07 +00:00
parent 38f1ab2e1e
commit 926f242b32
1 changed files with 6 additions and 2 deletions
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src/java/com/samskivert/util/DependencyGraph.java
+6 -2
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@@ -101,14 +101,18 @@ public class DependencyGraph<T>
{ {
_orphans.remove(dependant); _orphans.remove(dependant);
DependencyNode<T> dependantNode = _nodes.get(dependant); DependencyNode<T> dependantNode = _nodes.get(dependant);
if (dependantNode == null) {
throw new IllegalArgumentException("Unknown dependant? " + dependant);
}
DependencyNode<T> dependeeNode = _nodes.get(dependee); DependencyNode<T> dependeeNode = _nodes.get(dependee);
if (dependeeNode == null) {
throw new IllegalArgumentException("Unknown dependee? " + dependee);
}
if (dependsOn(dependee, dependant)) { if (dependsOn(dependee, dependant)) {
throw new IllegalArgumentException("Refusing to create circular dependency."); throw new IllegalArgumentException("Refusing to create circular dependency.");
} }
dependantNode.parents.add(dependeeNode); dependantNode.parents.add(dependeeNode);
dependeeNode.children.add(dependantNode); dependeeNode.children.add(dependantNode);
} }
/** /**