Examples of org.apache.lucene.store.Directory.openInput()

org.apache.lucene.store.Directory.openInput()
Returns a stream reading an existing file.

      Set other = new HashSet(Arrays.asList(new String[0]));


      // ok, file listing works.
      AssertJUnit.assertEquals(s, other);


      IndexInput ii = dir.openInput("Hello.txt", IOContext.DEFAULT);


      assert ii.length() == helloText.length();


      ByteArrayOutputStream baos = new ByteArrayOutputStream();

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         baos.write(ii.readByte());
      }


      assert new String(baos.toByteArray()).equals(helloText);


      ii = dir.openInput("World.txt", IOContext.DEFAULT);


      assert ii.length() == worldText.length();


      baos = new ByteArrayOutputStream();

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      assert new String(baos.toByteArray()).equals(worldText);


      // now with buffered reading


      ii = dir.openInput("Hello.txt", IOContext.DEFAULT);


      assert ii.length() == helloText.length();


      baos = new ByteArrayOutputStream();

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         baos.write(buf, 0, bytesRead);
      }


      assert new String(baos.toByteArray()).equals(helloText);


      ii = dir.openInput("World.txt", IOContext.DEFAULT);


      assert ii.length() == worldText.length();


      baos = new ByteArrayOutputStream();

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      assert cache.get(new FileCacheKey(INDEXNAME, "HelloWorld.txt")).equals(ob1);
      assert cache.get(new ChunkCacheKey(INDEXNAME, "HelloWorld.txt", 0, BUFFER_SIZE)).equals(ob2);
      assert cache.get(new ChunkCacheKey(INDEXNAME, "HelloWorld.txt", 1, BUFFER_SIZE)).equals(ob3);


      // test that contents survives a move
      ii = dir.openInput("HelloWorld.txt", IOContext.DEFAULT);


      assert ii.length() == worldText.length();


      baos = new ByteArrayOutputStream();

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      assert dir.fileExists("MyNewFile.txt");
      assert null != cache.get(new ChunkCacheKey(INDEXNAME, "MyNewFile.txt", 0, BUFFER_SIZE));


      // test contents by reading:
      byte[] buf = new byte[9];
      IndexInput ii = dir.openInput("MyNewFile.txt", IOContext.DEFAULT);
      ii.readBytes(buf, 0, (int) ii.length());
      ii.close();


      assert new String(new byte[] { 66, 69 }).equals(new String(buf).trim());

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      FileMetadata metadata = (FileMetadata) cache.get(fileCacheKey);
      AssertJUnit.assertEquals(testTextAsBytes.length + 3, metadata.getSize());
      assert null != cache.get(new ChunkCacheKey(INDEXNAME, "MyNewFile.txt", 0, DirectoryBuilderImpl.DEFAULT_BUFFER_SIZE));


      // test contents by reading:
      IndexInput ii = dir.openInput("MyNewFile.txt", IOContext.DEFAULT);
      assert ii.readByte() == 1;
      assert ii.readByte() == 2;
      assert ii.readByte() == 3;
      byte[] buf = new byte[testTextAsBytes.length];

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      for (int i = 0; i < 10; i++) {
         indexOutput.writeBytes(manyBytes, bufferSize);
         indexOutput.flush();
      }
      indexOutput.close();
      IndexInput input = dir.openInput(filename, IOContext.DEFAULT);
      final int finalSize = (10 * bufferSize);
      AssertJUnit.assertEquals(finalSize, input.length());
      final byte[] resultingBuffer = new byte[finalSize];
      input.readBytes(resultingBuffer, 0, finalSize);
      int index = 0;

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        // writing segments file:
        String fileNameIn = SegmentInfos.getCurrentSegmentFileName(dir);
        String fileNameOut = IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS,
                                                                   "",
                                                                   1+gen);
        IndexInput in = dir.openInput(fileNameIn);
        IndexOutput out = dir.createOutput(fileNameOut);
        long length = in.length();
        for(int i=0;i<length-1;i++) {
          out.writeByte(in.readByte());
        }

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        String fileNameIn = SegmentInfos.getCurrentSegmentFileName(dir);
        String fileNameOut = IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS,
                                                                   "",
                                                                   1+gen);
        IndexInput in = dir.openInput(fileNameIn);
        IndexOutput out = dir.createOutput(fileNameOut);
        long length = in.length();
        for(int i=0;i<length-1;i++) {
          out.writeByte(in.readByte());
        }

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