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package org.apache.lucene.store;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.store.SimpleFSDirectory.SimpleFSIndexInput;
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/** This class provides access to package-level features defined in the
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* store package. It is used for testing only.
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public class _TestHelper {
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/** Returns true if the instance of the provided input stream is actually
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* an SimpleFSIndexInput.
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public static boolean isSimpleFSIndexInput(IndexInput is) {
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return is instanceof SimpleFSIndexInput;
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/** Returns true if the provided input stream is an SimpleFSIndexInput and
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* is a clone, that is it does not own its underlying file descriptor.
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public static boolean isSimpleFSIndexInputClone(IndexInput is) {
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if (isSimpleFSIndexInput(is)) {
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return ((SimpleFSIndexInput) is).isClone;
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/** Given an instance of SimpleFSDirectory.SimpleFSIndexInput, this method returns
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* true if the underlying file descriptor is valid, and false otherwise.
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* This can be used to determine if the OS file has been closed.
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* The descriptor becomes invalid when the non-clone instance of the
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* SimpleFSIndexInput that owns this descriptor is closed. However, the
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* descriptor may possibly become invalid in other ways as well.
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public static boolean isSimpleFSIndexInputOpen(IndexInput is)
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if (isSimpleFSIndexInput(is)) {
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SimpleFSIndexInput fis = (SimpleFSIndexInput) is;
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return fis.isFDValid();