Source Code Cross Referenced for _TestHelper.java in  » Search-Engine » lucene » org » apache » lucene » store » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » lucene » org.apache.lucene.store 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.apache.lucene.store;
02:
03:        /**
04:         * Licensed to the Apache Software Foundation (ASF) under one or more
05:         * contributor license agreements.  See the NOTICE file distributed with
06:         * this work for additional information regarding copyright ownership.
07:         * The ASF licenses this file to You under the Apache License, Version 2.0
08:         * (the "License"); you may not use this file except in compliance with
09:         * the License.  You may obtain a copy of the License at
10:         *
11:         *     http://www.apache.org/licenses/LICENSE-2.0
12:         *
13:         * Unless required by applicable law or agreed to in writing, software
14:         * distributed under the License is distributed on an "AS IS" BASIS,
15:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16:         * See the License for the specific language governing permissions and
17:         * limitations under the License.
18:         */
19:
20:        import java.io.IOException;
21:
22:        import org.apache.lucene.store.FSDirectory.FSIndexInput;
23:
24:        /** This class provides access to package-level features defined in the
25:         *  store package. It is used for testing only.
26:         */
27:        public class _TestHelper {
28:
29:            /** Returns true if the instance of the provided input stream is actually
30:             *  an FSIndexInput.
31:             */
32:            public static boolean isFSIndexInput(IndexInput is) {
33:                return is instanceof  FSIndexInput;
34:            }
35:
36:            /** Returns true if the provided input stream is an FSIndexInput and
37:             *  is a clone, that is it does not own its underlying file descriptor.
38:             */
39:            public static boolean isFSIndexInputClone(IndexInput is) {
40:                if (isFSIndexInput(is)) {
41:                    return ((FSIndexInput) is).isClone;
42:                } else {
43:                    return false;
44:                }
45:            }
46:
47:            /** Given an instance of FSDirectory.FSIndexInput, this method returns
48:             *  true if the underlying file descriptor is valid, and false otherwise.
49:             *  This can be used to determine if the OS file has been closed.
50:             *  The descriptor becomes invalid when the non-clone instance of the
51:             *  FSIndexInput that owns this descriptor is closed. However, the
52:             *  descriptor may possibly become invalid in other ways as well.
53:             */
54:            public static boolean isFSIndexInputOpen(IndexInput is)
55:                    throws IOException {
56:                if (isFSIndexInput(is)) {
57:                    FSIndexInput fis = (FSIndexInput) is;
58:                    return fis.isFDValid();
59:                } else {
60:                    return false;
61:                }
62:            }
63:
64:        }
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