/*
* 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.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Lucene.Net.Index;
using Lucene.Net.Util;
namespace Lucene.Net.Search
{
///
/// A filter that contains multiple terms.
///
public class TermsFilter : Filter
{
///
/// The set of terms for this filter.
///
protected ISet terms = new SortedSet();
///
/// Add a term to the set.
///
/// The term to add.
public void AddTerm(Term term)
{
terms.Add(term);
}
///
/// Get the DocIdSet.
///
/// Applcible reader.
/// The set.
public override DocIdSet GetDocIdSet(IndexReader reader)
{
OpenBitSet result = new OpenBitSet(reader.MaxDoc);
TermDocs td = reader.TermDocs();
try
{
foreach (Term t in this.terms)
{
td.Seek(t);
while (td.Next())
{
result.Set(td.Doc);
}
}
}
finally
{
td.Close();
}
return result;
}
public override bool Equals(Object obj)
{
if (this == obj)
{
return true;
}
if ((obj == null) || !(obj is TermsFilter))
{
return false;
}
TermsFilter test = (TermsFilter)obj;
// TODO: Does SortedSet have an issues like List? see EquatableList in Support
return (terms == test.terms || (terms != null && terms.Equals(test.terms)));
}
public override int GetHashCode()
{
int hash = 9;
foreach (Term t in this.terms)
{
hash = 31 * hash + t.GetHashCode();
}
return hash;
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.Append("(");
foreach (Term t in this.terms)
{
sb.AppendFormat(" {0}:{1}", t.Field, t.Text);
}
sb.Append(" )");
return sb.ToString();
}
}
}