Examples with InputStreamIndexInput org.elasticsearch.common.lucene.store.InputStreamIndexInput used on opensource projects

Example 1 with InputStreamIndexInput

use of org.elasticsearch.common.lucene.store.InputStreamIndexInput in project elasticsearch by elastic.

the class MetaDataStateFormat method read.

/**
     * Reads the state from a given file and compares the expected version against the actual version of
     * the state.
     */
public final T read(NamedXContentRegistry namedXContentRegistry, Path file) throws IOException {
    try (Directory dir = newDirectory(file.getParent())) {
        try (IndexInput indexInput = dir.openInput(file.getFileName().toString(), IOContext.DEFAULT)) {
            // We checksum the entire file before we even go and parse it. If it's corrupted we barf right here.
            CodecUtil.checksumEntireFile(indexInput);
            final int fileVersion = CodecUtil.checkHeader(indexInput, STATE_FILE_CODEC, MIN_COMPATIBLE_STATE_FILE_VERSION, STATE_FILE_VERSION);
            final XContentType xContentType = XContentType.values()[indexInput.readInt()];
            if (fileVersion == STATE_FILE_VERSION_ES_2X_AND_BELOW) {
                // format version 0, wrote a version that always came from the content state file and was never used
                // version currently unused
                indexInput.readLong();
            }
            long filePointer = indexInput.getFilePointer();
            long contentSize = indexInput.length() - CodecUtil.footerLength() - filePointer;
            try (IndexInput slice = indexInput.slice("state_xcontent", filePointer, contentSize)) {
                try (XContentParser parser = XContentFactory.xContent(xContentType).createParser(namedXContentRegistry, new InputStreamIndexInput(slice, contentSize))) {
                    return fromXContent(parser);
                }
            }
        } catch (CorruptIndexException | IndexFormatTooOldException | IndexFormatTooNewException ex) {
            // we trick this into a dedicated exception with the original stacktrace
            throw new CorruptStateException(ex);
        }
    }
}