automatically ignore islands

brouter-mapaccess/src/main/java/btools/mapaccess/OsmNodePairSet.java

@@ -0,0 +1,122 @@
+/**
+ * Set holding pairs of osm nodes
+ *
+ * @author ab
+ */
+package btools.mapaccess;
+
+import btools.util.CompactLongMap;
+
+public class OsmNodePairSet
+{
+  private long[] n1a;
+  private long[] n2a;
+  private int tempNodes = 0;
+  private int maxTempNodes = 0;
+  private int npairs = 0;
+  private int freezecount = 0;
+
+  public OsmNodePairSet( int maxTempNodeCount )
+  {
+    maxTempNodes = maxTempNodeCount;
+    n1a = new long[maxTempNodes];
+    n2a = new long[maxTempNodes];
+  }
+
+  private static class OsmNodePair
+  {
+    public long node2;
+    public OsmNodePair next;
+  }
+  
+  private CompactLongMap<OsmNodePair> map;
+
+  public void addTempPair( long n1, long n2 )
+  {
+    if ( tempNodes < maxTempNodes )
+    {
+      n1a[tempNodes] = n1;
+      n2a[tempNodes] = n2;
+      tempNodes++;
+    }
+  }
+  
+  public void freezeTempPairs()
+  {
+    freezecount++;
+    for( int i=0; i<tempNodes; i++ )
+    {
+      addPair( n1a[i], n2a[i] );
+    }
+    tempNodes = 0;
+  }
+  
+  public void clearTempPairs()
+  {
+    tempNodes = 0;
+  }
+
+  private void addPair( long n1, long n2 )
+  {
+    if ( map == null )
+    {
+      map = new CompactLongMap<OsmNodePair>();
+    }
+    npairs++;
+  
+    OsmNodePair e = getElement( n1, n2 );
+    if ( e == null )
+    {
+      e = new OsmNodePair();
+      e.node2 = n2;
+
+      OsmNodePair e0 = map.get( n1 );
+      if ( e0 != null )
+      {
+        while( e0.next != null )
+        {
+          e0 = e0.next;
+        }
+        e0.next = e;
+      }
+      else
+      {
+        map.fastPut( n1, e );
+      }
+    }
+  }
+  
+  public int size()
+  {
+    return npairs;
+  }
+
+  public int tempSize()
+  {
+    return tempNodes;
+  }
+
+  public int getFreezeCount()
+  {
+    return freezecount;
+  }
+  
+  public boolean hasPair( long n1, long n2 )
+  {
+    return map != null && ( getElement( n1, n2 ) != null || getElement( n2, n1 ) != null );
+  }
+
+  private OsmNodePair getElement( long n1, long n2 )
+  {
+    OsmNodePair e = map.get( n1 );
+    while (e != null)
+    {
+      if ( e.node2 == n2 )
+      {
+        return e;
+      }
+      e = e.next;
+    }
+    return null;
+  }
+}