initial commit of BRouter Version 0.98

brouter-util/src/test/java/btools/util/FrozenLongSet.java

@@ -0,0 +1,81 @@
+package btools.util;
+
+/**
+ * Frozen instance of Memory efficient Set
+ *
+ * This one is readily sorted into a singe array for faster access
+ *
+ * @author ab
+ */
+public class FrozenLongSet extends CompactLongSet
+{
+  private long[] faid;
+  private int size = 0;
+  private int p2size; // next power of 2 of size
+
+  public FrozenLongSet( CompactLongSet set )
+  {
+    size = set.size();
+
+    faid = new long[size];
+
+    set.moveToFrozenArray( faid );
+
+    p2size = 0x40000000;
+    while( p2size > size ) p2size >>= 1;
+  }
+
+  @Override
+  public boolean add( long id )
+  {
+    throw new RuntimeException( "cannot add on FrozenLongSet" );
+  }
+
+  @Override
+  public void fastAdd( long id )
+  {
+    throw new RuntimeException( "cannot add on FrozenLongSet" );
+  }
+
+  /**
+   * @return the number of entries in this set
+   */
+  @Override
+  public int size()
+  {
+    return size;
+  }
+
+
+
+  /**
+   * @return true if "id" is contained in this set.
+   */
+  @Override
+  public boolean contains( long id )
+  {
+    if ( size == 0 )
+    {
+      return false;
+    }
+    long[] a = faid;
+    int offset = p2size;
+    int n = 0;
+
+    while ( offset> 0 )
+    {
+      int nn = n + offset;
+      if ( nn < size && a[nn] <= id )
+      {
+        n = nn;
+      }
+      offset >>= 1;
+    }
+    if ( a[n] == id )
+    {
+      return true;
+    }
+    return false;
+  }
+
+}