pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / spatial / src / java / org / apache / lucene / spatial / tier / CartesianShapeFilter.java

diff --git a/lucene-java-3.5.0/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/tier/CartesianShapeFilter.java b/lucene-java-3.5.0/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/tier/CartesianShapeFilter.java
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+/**
+ * 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.tier;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.index.TermDocs;
+import org.apache.lucene.search.Filter;
+import org.apache.lucene.search.DocIdSet;
+import org.apache.lucene.util.NumericUtils;
+import org.apache.lucene.util.FixedBitSet;
+
+/**
+ * <p><font color="red"><b>NOTE:</b> This API is still in
+ * flux and might change in incompatible ways in the next
+ * release.</font>
+ */
+public class CartesianShapeFilter extends Filter {
+ 
+  private final Shape shape;
+  private final String fieldName;
+  
+  CartesianShapeFilter(final Shape shape, final String fieldName){
+    this.shape = shape;
+    this.fieldName = fieldName;
+  }
+  
+  @Override
+  public DocIdSet getDocIdSet(final IndexReader reader) throws IOException {
+    final FixedBitSet bits = new FixedBitSet(reader.maxDoc());
+    final TermDocs termDocs = reader.termDocs();
+    final List<Double> area = shape.getArea();
+    int sz = area.size();
+    
+    final Term term = new Term(fieldName);
+    // iterate through each boxid
+    for (int i =0; i< sz; i++) {
+      double boxId = area.get(i).doubleValue();
+      termDocs.seek(term.createTerm(NumericUtils.doubleToPrefixCoded(boxId)));
+      // iterate through all documents
+      // which have this boxId
+      while (termDocs.next()) {
+        bits.set(termDocs.doc());
+      }
+    }
+    return bits;
+  }
+}