X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/TermsFilter.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/TermsFilter.java b/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/TermsFilter.java
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+++ b/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/TermsFilter.java
@@ -0,0 +1,102 @@
+package org.apache.lucene.search;
+
+/**
+ * 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.
+ */
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.index.TermDocs;
+import org.apache.lucene.util.FixedBitSet;
+
+/**
+ * Constructs a filter for docs matching any of the terms added to this class. 
+ * Unlike a RangeFilter this can be used for filtering on multiple terms that are not necessarily in 
+ * a sequence. An example might be a collection of primary keys from a database query result or perhaps 
+ * a choice of "category" labels picked by the end user. As a filter, this is much faster than the 
+ * equivalent query (a BooleanQuery with many "should" TermQueries)
+ *
+ */
+public class TermsFilter extends Filter
+{
+	Set<Term> terms=new TreeSet<Term>();
+	
+	/**
+	 * Adds a term to the list of acceptable terms   
+	 * @param term
+	 */
+	public void addTerm(Term term)
+	{
+		terms.add(term);
+	}
+	
+/* (non-Javadoc)
+   * @see org.apache.lucene.search.Filter#getDocIdSet(org.apache.lucene.index.IndexReader)
+	 */
+  @Override
+  public DocIdSet getDocIdSet(IndexReader reader) throws IOException
+	{
+    FixedBitSet result=new FixedBitSet(reader.maxDoc());
+        TermDocs td = reader.termDocs();
+        try
+        {
+            for (Iterator<Term> iter = terms.iterator(); iter.hasNext();)
+            {
+                Term term = iter.next();
+                td.seek(term);
+                while (td.next())
+                {
+                    result.set(td.doc());
+                }
+            }
+        }
+        finally
+        {
+            td.close();
+        }
+        return result;
+	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if(this == obj)
+			return true;
+		if((obj == null) || (obj.getClass() != this.getClass()))
+				return false;
+		TermsFilter test = (TermsFilter)obj;
+		return (terms == test.terms ||
+					 (terms != null && terms.equals(test.terms)));
+	}
+
+	@Override
+	public int hashCode()
+	{
+		int hash=9;
+		for (Iterator<Term> iter = terms.iterator(); iter.hasNext();)
+		{
+			Term term = iter.next();
+			hash = 31 * hash + term.hashCode();			
+		}
+		return hash;
+	}
+	
+}