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.util.HashSet;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.FixedBitSet;
import org.apache.lucene.util.LuceneTestCase;

public class TermsFilterTest extends LuceneTestCase {
  
	public void testCachability() throws Exception
	{
		TermsFilter a=new TermsFilter();
		a.addTerm(new Term("field1","a"));
		a.addTerm(new Term("field1","b"));
		HashSet<Filter> cachedFilters=new HashSet<Filter>();
		cachedFilters.add(a);
		TermsFilter b=new TermsFilter();
		b.addTerm(new Term("field1","a"));
		b.addTerm(new Term("field1","b"));
		
		assertTrue("Must be cached",cachedFilters.contains(b));
		b.addTerm(new Term("field1","a")); //duplicate term
		assertTrue("Must be cached",cachedFilters.contains(b));
		b.addTerm(new Term("field1","c"));
		assertFalse("Must not be cached",cachedFilters.contains(b));
	}
	
	public void testMissingTerms() throws Exception {
		String fieldName="field1";
		Directory rd=newDirectory();
		RandomIndexWriter w = new RandomIndexWriter(random, rd);
		for (int i = 0; i < 100; i++) {
			Document doc=new Document();
			int term=i*10; //terms are units of 10;
			doc.add(newField(fieldName,""+term,Field.Store.YES,Field.Index.NOT_ANALYZED));
			w.addDocument(doc);			
		}
		IndexReader reader = w.getReader();
		w.close();
		
		TermsFilter tf=new TermsFilter();
		tf.addTerm(new Term(fieldName,"19"));
		FixedBitSet bits = (FixedBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match nothing", 0, bits.cardinality());

		tf.addTerm(new Term(fieldName,"20"));
		bits = (FixedBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 1", 1, bits.cardinality());
		
		tf.addTerm(new Term(fieldName,"10"));
		bits = (FixedBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 2", 2, bits.cardinality());
		
		tf.addTerm(new Term(fieldName,"00"));
		bits = (FixedBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 2", 2, bits.cardinality());
		
		reader.close();
		rd.close();
	}

  public void testMissingField() throws Exception {
    String fieldName = "field1";
    Directory rd1 = newDirectory();
    RandomIndexWriter w1 = new RandomIndexWriter(random, rd1);
    Document doc = new Document();
    doc.add(newField(fieldName, "content1", Field.Store.YES, Field.Index.NOT_ANALYZED));
    w1.addDocument(doc);
    IndexReader reader1 = w1.getReader();
    w1.close();
    
    fieldName = "field2";
    Directory rd2 = newDirectory();
    RandomIndexWriter w2 = new RandomIndexWriter(random, rd2);
    doc = new Document();
    doc.add(newField(fieldName, "content2", Field.Store.YES, Field.Index.NOT_ANALYZED));
    w2.addDocument(doc);
    IndexReader reader2 = w2.getReader();
    w2.close();
    
    TermsFilter tf = new TermsFilter();
    tf.addTerm(new Term(fieldName, "content1"));
    
    MultiReader multi = new MultiReader(reader1, reader2);
    for (IndexReader sub : multi.getSequentialSubReaders()) {
      FixedBitSet bits = (FixedBitSet) tf.getDocIdSet(sub);
      assertTrue("Must be >= 0", bits.cardinality() >= 0);      
    }
    multi.close();
    reader1.close();
    reader2.close();
    rd1.close();
    rd2.close();
  }
}