X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=org.simantics.interop.update%2Fsrc%2Forg%2Fsimantics%2Finterop%2Fupdate%2Fmodel%2FPropertyChange.java;fp=org.simantics.interop.update%2Fsrc%2Forg%2Fsimantics%2Finterop%2Fupdate%2Fmodel%2FPropertyChange.java;h=69256b0381ed7549ed4f4484734b6ddbbf306fc6;hb=ab4fc05981803ce2c430f93f34b8b6a8f85a53ce;hp=25d43592f7491662b349674d0bc80d5d61ce69a8;hpb=7554d449f0cd1c4111b85afd75e8abd6d81f56d6;p=simantics%2Finterop.git

diff --git a/org.simantics.interop.update/src/org/simantics/interop/update/model/PropertyChange.java b/org.simantics.interop.update/src/org/simantics/interop/update/model/PropertyChange.java
index 25d4359..69256b0 100644
--- a/org.simantics.interop.update/src/org/simantics/interop/update/model/PropertyChange.java
+++ b/org.simantics.interop.update/src/org/simantics/interop/update/model/PropertyChange.java
@@ -16,11 +16,15 @@ public class PropertyChange {
 	
 	
 	public PropertyChange(GraphChanges changes, Statement first, Statement second) {
+		if (first == null && second == null)
+			throw new IllegalArgumentException("At least one of the stamenents must be non null.");
 		this.pair = new Pair<Statement, Statement>(first, second);
 		this.changes = changes;
 	}
 	
 	public PropertyChange(GraphChanges changes, Pair<Statement, Statement> change) {
+		if (change == null || (change.first == null && change.second == null))
+			throw new IllegalArgumentException("At least one of the stamenents must be non null.");
 		this.pair = change;
 		this.changes = changes;
 	}
@@ -96,4 +100,14 @@ public class PropertyChange {
 		this.visible = visible;
 	}
 	
+	@Override
+	public String toString() {
+		String s = "PropertyChange";
+		if (pair.first != null)
+			s += " (" + (pair.first.getSubject()) + " , " + pair.first.getPredicate() + " , " + pair.first.getObject() + ")";
+		if (pair.second != null)
+			s += " (" + (pair.second.getSubject()) + " , " + pair.second.getPredicate() + " , " + pair.second.getObject() + ")";
+		return s;
+	}
+	
 }