Initial revision
[beagle.git] / Lucene.Net / Index / TermEnum.cs
blobbc384736a24e574c150f225f4fbc1739e5919b10
1 namespace Lucene.Net.Index
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Lucene" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Lucene", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
57 /// <summary>
58 /// Abstract class for enumerating terms.
59 /// <p>Term enumerations are always ordered by Term.CompareTo(). Each term in
60 /// the enumeration is greater than all that precede it. </p>
61 /// </summary>
62 public abstract class TermEnum
64 /// <summary>
65 /// Increments the enumeration to the next element.
66 /// </summary>
67 /// <returns>True if one exists.</returns>
68 public abstract bool Next();
70 /// <summary>
71 /// Returns the current Term in the enumeration.
72 /// </summary>
73 /// <returns></returns>
74 public abstract Term Term();
76 /// <summary>
77 /// Returns the docFreq of the current Term in the enumeration.
78 /// </summary>
79 /// <returns></returns>
80 public abstract int DocFreq();
82 /// <summary>
83 /// Closes the enumeration to further activity, freeing resources.
84 /// </summary>
85 public abstract void Close();