diff --git a/contrib/spatial/src/java/org/apache/lucene/spatial/SerialChainFilter.java b/contrib/spatial/src/java/org/apache/lucene/spatial/SerialChainFilter.java
index 718e496062e..9cc6f92df36 100644
--- a/contrib/spatial/src/java/org/apache/lucene/spatial/SerialChainFilter.java
+++ b/contrib/spatial/src/java/org/apache/lucene/spatial/SerialChainFilter.java
@@ -1,199 +1,209 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.lucene.spatial;
-
-import java.io.IOException;
-import java.util.BitSet;
-
-import org.apache.lucene.index.CorruptIndexException;
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.search.Filter;
-
-/**
- * 
- * Provide a serial chain filter, passing the bitset in with the
- * index reader to each of the filters in an ordered fashion.
- * 
- * Based off chain filter, but will some improvements to allow a narrowed down
- * filtering. Traditional filter required iteration through an IndexReader.
- * 
- * By implementing the ISerialChainFilter class, you can create a bits(IndexReader reader, BitSet bits)
- * @see org.apache.lucene.spatial.ISerialChainFilter
- * 
- */
-public class SerialChainFilter extends Filter {
-
-  /**
-   * $Id: SerialChainFilter.java 136 2008-12-17 16:16:38Z ryantxu $
-   */
-  private static final long serialVersionUID = 1L;
-  private Filter chain[];
-  public static final int SERIALAND = 1;
-  public static final int SERIALOR = 2;
-  public static final int AND = 3;  // regular filters may be used first
-  public static final int OR = 4;    // regular filters may be used first
-  public static final int DEFAULT = SERIALOR;
-  
-  private int actionType[];
-  
-  public SerialChainFilter(Filter chain[]){
-    this.chain = chain;
-    this.actionType = new int[] {DEFAULT};
-  }
-  
-  public SerialChainFilter(Filter chain[], int actionType[]){
-    this.chain= chain;
-    this.actionType = actionType;
-  }
-  
-  /* (non-Javadoc)
-   * @see org.apache.lucene.search.Filter#bits(org.apache.lucene.index.IndexReader)
-   */
-  @Override
-  public BitSet bits(IndexReader reader) throws CorruptIndexException, IOException {
-    
-    BitSet bits = new BitSet(reader.maxDoc());
-    int chainSize = chain.length;
-    int actionSize = actionType.length;
-    int i = 0;
-    
-    /**
-     * taken from ChainedFilter, first and on an empty bitset results in 0
-     */
-    if (actionType[i] == AND){
-       try {
-        bits = (BitSet) chain[i].bits(reader).clone();
-      } catch (IOException e) {
-        // TODO Auto-generated catch block
-        e.printStackTrace();
-      }
-           ++i;
-    }
-    
-    for( ; i < chainSize; i++) {
-    
-      int action = (i < actionSize)? actionType[i]: DEFAULT;
-    
-      switch (action){
-      
-      case (SERIALAND):
-        try {
-            bits.and(((ISerialChainFilter) chain[i]).bits(reader, bits));
-          } catch (CorruptIndexException e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-          } catch (IOException e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-          } catch (Exception e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-          }
-        break;
-      case (SERIALOR):
-        try {
-            bits.or(((ISerialChainFilter) chain[i]).bits(reader,bits));
-          } catch (Exception e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-          }
-        break;
-      case (AND):
-        bits.and(chain[i].bits(reader));
-        break;
-      case (OR):
-        bits.and(chain[i].bits(reader));
-        break;
-      }
-  
-    }
-    return bits;
-  }
-
-    /**
-   * @return the chain
-   */
-  Filter[] getChain() {
-    return chain;
-  }
-
-  /**
-   * @return the actionType
-   */
-  int[] getActionType() {
-    return actionType;
-  }
-
-  /** 
-   * Returns true if <code>o</code> is equal to this.
-   * 
-   * @see org.apache.lucene.search.RangeFilter#equals
-   */
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) return true;
-    if (!(o instanceof SerialChainFilter)) return false;
-    SerialChainFilter other = (SerialChainFilter) o;
-
-    if (this.chain.length != other.getChain().length ||
-      this.actionType.length != other.getActionType().length)
-      return false;
-    
-    for (int i = 0; i < this.chain.length; i++) {
-      if (this.actionType[i] != other.getActionType()[i]  ||
-        (!this.chain[i].equals(other.getChain()[i])))
-        return false;
-    }
-    return true;
-  }
-    
-  /** 
-   * Returns a hash code value for this object.
-   * 
-   * @see org.apache.lucene.search.RangeFilter#hashCode
-   */
-  @Override
-  public int hashCode() {
-    if (chain.length == 0)
-      return 0;
-
-    int h = chain[0].hashCode() ^ new Integer(actionType[0]).hashCode(); 
-    for (int i = 1; i < this.chain.length; i++) {
-      h ^= chain[i].hashCode();
-      h ^= new Integer(actionType[i]).hashCode();
-    }
-    return h;
-  }
-  
-  @Override
-  public String toString() {
-    StringBuffer buf = new StringBuffer();
-    buf.append("SerialChainFilter(");
-    for (int i = 0; i < chain.length; i++) {
-      switch(actionType[i]) {
-        case (SERIALAND): buf.append("SERIALAND"); break;
-        case (SERIALOR):  buf.append("SERIALOR");  break;
-        case (AND):       buf.append("AND");       break;
-        case (OR):        buf.append("OR");        break;
-        default:          buf.append(actionType[i]);
-      }
-      buf.append(" " + chain[i].toString() + " ");
-    }
-    return buf.toString().trim() + ")";
-  }
-}
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.lucene.spatial;
+
+import java.io.IOException;
+import java.util.BitSet;
+
+import org.apache.lucene.index.CorruptIndexException;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.search.DocIdSet;
+import org.apache.lucene.search.Filter;
+import org.apache.lucene.util.DocIdBitSet;
+
+/**
+ * 
+ * Provide a serial chain filter, passing the bitset in with the
+ * index reader to each of the filters in an ordered fashion.
+ * 
+ * Based off chain filter, but with some improvements to allow a narrowed down
+ * filtering. Traditional filter required iteration through an IndexReader.
+ * 
+ * By implementing the ISerialChainFilter class, you can create a bits(IndexReader reader, BitSet bits)
+ * @see org.apache.lucene.search.ISerialChainFilter
+ * 
+ */
+public class SerialChainFilter extends Filter {
+
+  /**
+   * $Id: SerialChainFilter.java 136 2008-12-17 16:16:38Z ryantxu $
+   */
+  private static final long serialVersionUID = 1L;
+  private Filter chain[];
+  public static final int SERIALAND = 1;
+  public static final int SERIALOR = 2;
+  public static final int AND = 3;  // regular filters may be used first
+  public static final int OR = 4;    // regular filters may be used first
+  public static final int DEFAULT = SERIALOR;
+  
+  private int actionType[];
+  
+  public SerialChainFilter(Filter chain[]){
+    this.chain = chain;
+    this.actionType = new int[] {DEFAULT};
+  }
+  
+  public SerialChainFilter(Filter chain[], int actionType[]){
+    this.chain= chain;
+    this.actionType = actionType;
+  }
+  
+  /* (non-Javadoc)
+   * @see org.apache.lucene.search.Filter#bits(org.apache.lucene.index.IndexReader)
+   */
+  @Override
+  public BitSet bits(IndexReader reader) throws IOException {
+	  return ((DocIdBitSet)getDocIdSet(reader)).getBitSet();
+  }
+  
+  
+  /* (non-Javadoc)
+   * @see org.apache.lucene.search.Filter#getDocIdSet(org.apache.lucene.index.IndexReader)
+   */
+  @Override
+  public DocIdSet getDocIdSet(IndexReader reader) throws CorruptIndexException, IOException {
+    
+    BitSet bits = new BitSet(reader.maxDoc());
+    int chainSize = chain.length;
+    int actionSize = actionType.length;
+    int i = 0;
+    
+    /**
+     * taken from ChainedFilter, first and on an empty bitset results in 0
+     */
+    if (actionType[i] == AND){
+       try {
+        bits = (BitSet) ((DocIdBitSet)chain[i].getDocIdSet(reader)).getBitSet().clone();
+      } catch (IOException e) {
+        // TODO Auto-generated catch block
+        e.printStackTrace();
+      }
+      ++i;
+    }
+    
+    for( ; i < chainSize; i++) {
+    
+      int action = (i < actionSize)? actionType[i]: DEFAULT;
+    
+      switch (action){
+      
+      case (SERIALAND):
+        try {
+            bits.and(((ISerialChainFilter) chain[i]).bits(reader, bits));
+          } catch (CorruptIndexException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+          } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+          } catch (Exception e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+          }
+        break;
+      case (SERIALOR):
+        try {
+            bits.or(((ISerialChainFilter) chain[i]).bits(reader,bits));
+          } catch (Exception e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+          }
+        break;
+      case (AND):
+        bits.and(((DocIdBitSet)chain[i].getDocIdSet(reader)).getBitSet());
+        break;
+      case (OR):
+        bits.or(((DocIdBitSet)chain[i].getDocIdSet(reader)).getBitSet());
+        break;
+      }
+    }
+    return new DocIdBitSet(bits);
+  }
+
+  /**
+   * @return the chain
+   */
+  Filter[] getChain() {
+    return chain;
+  }
+
+  /**
+   * @return the actionType
+   */
+  int[] getActionType() {
+    return actionType;
+  }
+
+  /** 
+   * Returns true if <code>o</code> is equal to this.
+   * 
+   * @see org.apache.lucene.search.RangeFilter#equals
+   */
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (!(o instanceof SerialChainFilter)) return false;
+    SerialChainFilter other = (SerialChainFilter) o;
+
+    if (this.chain.length != other.getChain().length ||
+      this.actionType.length != other.getActionType().length)
+      return false;
+    
+    for (int i = 0; i < this.chain.length; i++) {
+      if (this.actionType[i] != other.getActionType()[i]  ||
+        (!this.chain[i].equals(other.getChain()[i])))
+        return false;
+    }
+    return true;
+  }
+    
+  /** 
+   * Returns a hash code value for this object.
+   * 
+   * @see org.apache.lucene.search.RangeFilter#hashCode
+   */
+  @Override
+  public int hashCode() {
+    if (chain.length == 0)
+      return 0;
+
+    int h = chain[0].hashCode() ^ new Integer(actionType[0]).hashCode(); 
+    for (int i = 1; i < this.chain.length; i++) {
+      h ^= chain[i].hashCode();
+      h ^= new Integer(actionType[i]).hashCode();
+    }
+    return h;
+  }
+  
+  @Override
+  public String toString() {
+    StringBuffer buf = new StringBuffer();
+    buf.append("SerialChainFilter(");
+    for (int i = 0; i < chain.length; i++) {
+      switch(actionType[i]) {
+        case (SERIALAND): buf.append("SERIALAND"); break;
+        case (SERIALOR):  buf.append("SERIALOR");  break;
+        case (AND):       buf.append("AND");       break;
+        case (OR):        buf.append("OR");        break;
+        default:          buf.append(actionType[i]);
+      }
+      buf.append(" " + chain[i].toString() + " ");
+    }
+    return buf.toString().trim() + ")";
+  }
+}