final Document doc(int n, FieldSelector fieldSelector) throws IOException { indexStream.seek(n * 8L); long position = indexStream.readLong(); fieldsStream.seek(position); Document doc = new Document(); int numFields = fieldsStream.readVInt(); for (int i = 0; i < numFields; i++) { int fieldNumber = fieldsStream.readVInt(); FieldInfo fi = fieldInfos.fieldInfo(fieldNumber); FieldSelectorResult acceptField = fieldSelector == null ? FieldSelectorResult.LOAD : fieldSelector.accept(fi.name); byte bits = fieldsStream.readByte(); boolean compressed = (bits & FieldsWriter.FIELD_IS_COMPRESSED) != 0; boolean tokenize = (bits & FieldsWriter.FIELD_IS_TOKENIZED) != 0; boolean binary = (bits & FieldsWriter.FIELD_IS_BINARY) != 0; // TODO: Find an alternative approach here if this list continues to grow beyond the // list of 5 or 6 currently here. See Lucene 762 for discussion if (acceptField.equals(FieldSelectorResult.LOAD)) { addField(doc, fi, binary, compressed, tokenize); } else if (acceptField.equals(FieldSelectorResult.LOAD_FOR_MERGE)) { addFieldForMerge(doc, fi, binary, compressed, tokenize); } else if (acceptField.equals(FieldSelectorResult.LOAD_AND_BREAK)) { addField(doc, fi, binary, compressed, tokenize); break; // Get out of this loop } else if (acceptField.equals(FieldSelectorResult.LAZY_LOAD)) { addFieldLazy(doc, fi, binary, compressed, tokenize); } else if (acceptField.equals(FieldSelectorResult.SIZE)) { skipField(binary, compressed, addFieldSize(doc, fi, binary, compressed)); } else if (acceptField.equals(FieldSelectorResult.SIZE_AND_BREAK)) { addFieldSize(doc, fi, binary, compressed); break; } else { skipField(binary, compressed); } } return doc; }