fix exception in SemanticGraph#makeSoftCopy if there is no root.

sebschu · Stanford NLP · commit 6f3509f73c19 · 2015-03-20T21:37:11.000-07:00
diff --git a/src/edu/stanford/nlp/semgraph/SemanticGraph.java b/src/edu/stanford/nlp/semgraph/SemanticGraph.java
@@ -1741,7 +1741,8 @@ public List<SemanticGraphEdge> getShortestDirectedPathEdges(IndexedWord source,
   
   public SemanticGraph makeSoftCopy() {
     SemanticGraph newSg = new SemanticGraph();
-    newSg.setRoot(this.getFirstRoot());
+    if ( ! this.roots.isEmpty())
+      newSg.setRoot(this.getFirstRoot());
     for (SemanticGraphEdge edge : this.edgeIterable()) {
       newSg.addEdge(edge.getSource(), edge.getTarget(), edge.getRelation(), edge.getWeight(), edge.isExtra());
     }

Original file line number	Diff line number	Diff line change
`@@ -1741,7 +1741,8 @@ public List<SemanticGraphEdge> getShortestDirectedPathEdges(IndexedWord source,`
`1741`	`1741`
`1742`	`1742`	`public SemanticGraph makeSoftCopy() {`
`1743`	`1743`	`SemanticGraph newSg = new SemanticGraph();`
`1744`		`- newSg.setRoot(this.getFirstRoot());`
	`1744`	`+ if ( ! this.roots.isEmpty())`
	`1745`	`+ newSg.setRoot(this.getFirstRoot());`
`1745`	`1746`	`for (SemanticGraphEdge edge : this.edgeIterable()) {`
`1746`	`1747`	`newSg.addEdge(edge.getSource(), edge.getTarget(), edge.getRelation(), edge.getWeight(), edge.isExtra());`
`1747`	`1748`	`}`