2 * The Apache Software License, Version 1.1
5 * Copyright (c) 1999 The Apache Software Foundation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
26 * 4. The names "Xindice" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation and was
51 * originally based on software copyright (c) 1999-2001, The dbXML
52 * Group, L.L.C., http://www.dbxmlgroup.com. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
57 package net.jxta.impl.xindice.core.filer;
59 import net.jxta.impl.xindice.core.DBException;
60 import net.jxta.impl.xindice.core.DBObject;
61 import net.jxta.impl.xindice.core.data.Key;
62 import net.jxta.impl.xindice.core.data.Record;
63 import net.jxta.impl.xindice.core.data.RecordSet;
64 import net.jxta.impl.xindice.core.data.Value;
65 import net.jxta.impl.xindice.util.Named;
68 * Filer is the low-level file management interface for Xindice. A Filer object
69 * is implemented in order to provide a data source to the Xindice Collection
70 * class. Filers are developed to perform transparent storage and retrieval to
71 * and from heterogenous data sources (such as FTP, HTTP, RDBMS, etc...)
73 public interface Filer extends Named, DBObject {
76 * readRecord returns a Record from the Filer based on the specified
79 * @param key The Record's Key
80 * @return The returned Record
81 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
83 Record readRecord(Key key) throws DBException;
86 * readRecord returns a Record from the Filer at the specified
87 * position. The Record's Key will be set to null.
89 * @param pos The Record's position
90 * @return The returned Record
91 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
93 Record readRecord(long pos) throws DBException;
96 * writeRecord writes a Value to the Filer based on the specified Key.
98 * @param key The Record's Key
99 * @param value The Record's Value
100 * @return 0 if the Record could not be written, the starting
101 * offset of the Record otherwise (used for indexing)
102 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
104 long writeRecord(Key key, Value value) throws DBException;
107 * deleteRecord removes a Record from the Filer based on the
110 * @param key The Record's Key
111 * @return Whether or not the Record was deleted
112 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
114 boolean deleteRecord(Key key) throws DBException;
117 * getRecordCount returns the number of Records in the Filer.
119 * @return The Record count
120 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
122 long getRecordCount() throws DBException;
125 * getRecordSet returns a RecordSet object for the current Filer.
127 * @return The Filer Enumerator
128 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
130 RecordSet getRecordSet() throws DBException;
133 * flush forcefully flushes any unwritten buffers to disk.
134 * @throws net.jxta.impl.xindice.core.DBException if a db exception occurs
136 void flush() throws DBException;