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

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

         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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        }
      }


      // make sure that all index files have been read or are kept open
      // so that if an index update removes them we'll still have them
      freqStream = cfsDir.openInput(segment + ".frq");
      proxStream = cfsDir.openInput(segment + ".prx");
      openNorms(cfsDir);


      if (fieldInfos.hasVectors()) { // open term vector files only as needed
        termVectorsReaderOrig = new TermVectorsReader(cfsDir, segment, fieldInfos);

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      }


      // make sure that all index files have been read or are kept open
      // so that if an index update removes them we'll still have them
      freqStream = cfsDir.openInput(segment + ".frq");
      proxStream = cfsDir.openInput(segment + ".prx");
      openNorms(cfsDir);


      if (fieldInfos.hasVectors()) { // open term vector files only as needed
        termVectorsReaderOrig = new TermVectorsReader(cfsDir, segment, fieldInfos);
      }

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        String fileName = si.getNormFileName(fi.number);
        if (!si.hasSeparateNorms(fi.number)) {
          d = cfsDir;
        }
        long normSeek = (fileName.endsWith("." + IndexFileNames.NORMS_EXTENSION) ? nextNormSeek : 0);
        norms.put(fi.name, new Norm(d.openInput(fileName), fi.number, normSeek));
        nextNormSeek += maxDoc; // increment also if some norms are separate
      }
    }
  }

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          long normSeek;


          if (singleNormFile) {
            normSeek = nextNormSeek;
            if (singleNormStream == null) {
              singleNormStream = d.openInput(fileName, context);
              openFiles.add(singleNormStream);
            }
            // All norms in the .nrm file can share a single IndexInput since
            // they are only used in a synchronized context.
            // If this were to change in the future, a clone could be done here.

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            // All norms in the .nrm file can share a single IndexInput since
            // they are only used in a synchronized context.
            // If this were to change in the future, a clone could be done here.
            normInput = singleNormStream;
          } else {
            normInput = d.openInput(fileName, context);
            openFiles.add(normInput);
            // if the segment was created in 3.2 or after, we wrote the header for sure,
            // and don't need to do the sketchy file size check. otherwise, we check 
            // if the size is exactly equal to maxDoc to detect a headerless file.
            // NOTE: remove this check in Lucene 5.0!

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