From 1ef043e85670629b857984ada6d38172f3a230bf Mon Sep 17 00:00:00 2001
From: jjenista <jjenista>
Date: Fri, 21 Oct 2011 21:16:00 +0000
Subject: [PATCH] some extras for multiviewmaps

---
 Robust/src/Util/JoinOpSetUnion.java | 16 ++++++++++++++++
 Robust/src/Util/MultiViewMap.java   | 20 ++++++++++++++++----
 2 files changed, 32 insertions(+), 4 deletions(-)
 create mode 100644 Robust/src/Util/JoinOpSetUnion.java

diff --git a/Robust/src/Util/JoinOpSetUnion.java b/Robust/src/Util/JoinOpSetUnion.java
new file mode 100644
index 00000000..452cbff3
--- /dev/null
+++ b/Robust/src/Util/JoinOpSetUnion.java
@@ -0,0 +1,16 @@
+package Util;
+
+import java.util.Set;
+
+public class JoinOpSetUnion implements JoinOp<Set> {
+  public Set join( Set a, Set b ) {
+    Set out = new HashSet();
+    if( a != null ) {
+      out.addAll( a );
+    }
+    if( b != null ) {
+      out.addAll( b );
+    }
+    return out;
+  }
+}
diff --git a/Robust/src/Util/MultiViewMap.java b/Robust/src/Util/MultiViewMap.java
index aad5f0bb..79e4eac2 100644
--- a/Robust/src/Util/MultiViewMap.java
+++ b/Robust/src/Util/MultiViewMap.java
@@ -32,6 +32,12 @@ public class MultiViewMap<T> {
   private boolean checkTypes;
   private boolean checkConsistency;
 
+
+  // for MultiViewMaps that don't need to use the value,
+  // template on type Object and map every key to this dummy
+  public static Object dummy = new Integer( -12345 );
+
+
   //  If the entire contents of this map are fullKey -> value:
   //    <a,b> -> 1
   //    <c,b> -> 2
@@ -73,10 +79,6 @@ public class MultiViewMap<T> {
   }
 
 
-  public int size() {
-    return fullKey2value.size();
-  }
-
   public boolean equals( Object o ) {
     if( this == o ) {
       return true;
@@ -111,6 +113,16 @@ public class MultiViewMap<T> {
   }
 
 
+  public int size() {
+    return fullKey2value.size();
+  }
+
+
+  public void clear() {
+    fullKey2value.clear();
+    view2partialKey2fullKeys.clear();
+  }
+
  
   public void put( MultiKey fullKey, T value ) {
     assert( typesMatch( fullKey ) );
-- 
2.34.1