| package org.apache.lucene.index; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache Lucene" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache Lucene", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import java.io.IOException; |
| import org.apache.lucene.document.Document; |
| |
| /** TermDocs provides an interface for enumerating <document, frequency> |
| pairs for a term. <p> The document portion names each document containing |
| the term. Documents are indicated by number. The frequency portion gives |
| the number of times the term occurred in each document. <p> The pairs are |
| ordered by document number. |
| |
| @see IndexReader#termDocs |
| */ |
| |
| public interface TermDocs { |
| /** Returns the current document number. <p> This is invalid until {@link |
| #next()} is called for the first time.*/ |
| public int doc(); |
| |
| /** Returns the frequency of the term within the current document. <p> This |
| is invalid until {@link #next()} is called for the first time.*/ |
| public int freq(); |
| |
| /** Moves to the next pair in the enumeration. <p> Returns true iff there is |
| such a next pair in the enumeration. */ |
| public boolean next() throws IOException; |
| |
| /** Attempts to read multiple entries from the enumeration, up to length of |
| * <i>docs</i>. Document numbers are stored in <i>docs</i>, and term |
| * frequencies are stored in <i>freqs</i>. The <i>freqs</i> array must be as |
| * long as the <i>docs</i> array. |
| * |
| * <p>Returns the number of entries read. Zero is only returned when the |
| * stream has been exhausted. */ |
| public int read(int[] docs, int[] freqs) throws IOException; |
| |
| /** Skips entries to the first beyond the current whose document number is |
| * greater than or equal to <i>target</i>. <p>Returns true iff there is such |
| * an entry. <p>Behaves as if written: <pre> |
| * public boolean skipTo(int target) { |
| * do { |
| * if (!next()) |
| * return false; |
| * } while (target > doc()); |
| * return true; |
| * } |
| * </pre> |
| * Some implementations are considerably more efficient than that. |
| */ |
| public boolean skipTo(int target) throws IOException; |
| |
| /** Frees associated resources. */ |
| public void close() throws IOException; |
| } |
| |
| |