@Override
  public void process(ResponseBuilder rb) throws IOException {
    SolrParams params = rb.req.getParams();
    if (!params.getBool(COMPONENT_NAME, false)) {
      return;
    }

    NamedList<Object> termVectors = new NamedList<Object>();
    rb.rsp.add(TERM_VECTORS, termVectors);

    IndexSchema schema = rb.req.getSchema();
    SchemaField keyField = schema.getUniqueKeyField();
    String uniqFieldName = null;
    if (keyField != null) {
      uniqFieldName = keyField.getName();
      termVectors.add("uniqueKeyFieldName", uniqFieldName);
    }

    FieldOptions allFields = new FieldOptions();
    // figure out what options we have, and try to get the appropriate vector
    allFields.termFreq = params.getBool(TermVectorParams.TF, false);
    allFields.positions = params.getBool(TermVectorParams.POSITIONS, false);
    allFields.offsets = params.getBool(TermVectorParams.OFFSETS, false);
    allFields.docFreq = params.getBool(TermVectorParams.DF, false);
    allFields.tfIdf = params.getBool(TermVectorParams.TF_IDF, false);
    // boolean cacheIdf = params.getBool(TermVectorParams.IDF, false);
    // short cut to all values.
    if (params.getBool(TermVectorParams.ALL, false)) {
      allFields.termFreq = true;
      allFields.positions = true;
      allFields.offsets = true;
      allFields.docFreq = true;
      allFields.tfIdf = true;
    }

    // Build up our per field mapping
    Map<String, FieldOptions> fieldOptions = new HashMap<String, FieldOptions>();
    NamedList<List<String>> warnings = new NamedList<List<String>>();
    List<String> noTV = new ArrayList<String>();
    List<String> noPos = new ArrayList<String>();
    List<String> noOff = new ArrayList<String>();

    Set<String> fields = getFields(rb);
    if (null != fields) {
      // we have specific fields to retrieve, or no fields
      for (String field : fields) {

        // workarround SOLR-3523
        if (null == field || "score".equals(field)) continue;

        // we don't want to issue warnings about the uniqueKey field
        // since it can cause lots of confusion in distributed requests
        // where the uniqueKey field is injected into the fl for merging
        final boolean fieldIsUniqueKey = field.equals(uniqFieldName);

        SchemaField sf = schema.getFieldOrNull(field);
        if (sf != null) {
          if (sf.storeTermVector()) {
            FieldOptions option = fieldOptions.get(field);
            if (option == null) {
              option = new FieldOptions();
              option.fieldName = field;
              fieldOptions.put(field, option);
            }
            // get the per field mappings
            option.termFreq = params.getFieldBool(field, TermVectorParams.TF, allFields.termFreq);
            option.docFreq = params.getFieldBool(field, TermVectorParams.DF, allFields.docFreq);
            option.tfIdf = params.getFieldBool(field, TermVectorParams.TF_IDF, allFields.tfIdf);
            // Validate these are even an option
            option.positions =
                params.getFieldBool(field, TermVectorParams.POSITIONS, allFields.positions);
            if (option.positions && !sf.storeTermPositions() && !fieldIsUniqueKey) {
              noPos.add(field);
            }
            option.offsets =
                params.getFieldBool(field, TermVectorParams.OFFSETS, allFields.offsets);
            if (option.offsets && !sf.storeTermOffsets() && !fieldIsUniqueKey) {
              noOff.add(field);
            }
          } else { // field doesn't have term vectors
            if (!fieldIsUniqueKey) noTV.add(field);
          }
        } else {
          // field doesn't exist
          throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "undefined field: " + field);
        }
      }
    } // else, deal with all fields

    // NOTE: currently all typs of warnings are schema driven, and garunteed
    // to be consistent across all shards - if additional types of warnings
    // are added that might be differnet between shards, finishStage() needs
    // to be changed to account for that.
    boolean hasWarnings = false;
    if (!noTV.isEmpty()) {
      warnings.add("noTermVectors", noTV);
      hasWarnings = true;
    }
    if (!noPos.isEmpty()) {
      warnings.add("noPositions", noPos);
      hasWarnings = true;
    }
    if (!noOff.isEmpty()) {
      warnings.add("noOffsets", noOff);
      hasWarnings = true;
    }
    if (hasWarnings) {
      termVectors.add("warnings", warnings);
    }

    DocListAndSet listAndSet = rb.getResults();
    List<Integer> docIds = getInts(params.getParams(TermVectorParams.DOC_IDS));
    Iterator<Integer> iter;
    if (docIds != null && !docIds.isEmpty()) {
      iter = docIds.iterator();
    } else {
      DocList list = listAndSet.docList;
      iter = list.iterator();
    }
    SolrIndexSearcher searcher = rb.req.getSearcher();

    IndexReader reader = searcher.getIndexReader();
    // the TVMapper is a TermVectorMapper which can be used to optimize loading of Term Vectors

    // Only load the id field to get the uniqueKey of that
    // field

    final String finalUniqFieldName = uniqFieldName;

    final List<String> uniqValues = new ArrayList<String>();

    // TODO: is this required to be single-valued? if so, we should STOP
    // once we find it...
    final StoredFieldVisitor getUniqValue =
        new StoredFieldVisitor() {
          @Override
          public void stringField(FieldInfo fieldInfo, String value) {
            uniqValues.add(value);
          }

          @Override
          public void intField(FieldInfo fieldInfo, int value) {
            uniqValues.add(Integer.toString(value));
          }

          @Override
          public void longField(FieldInfo fieldInfo, long value) {
            uniqValues.add(Long.toString(value));
          }

          @Override
          public Status needsField(FieldInfo fieldInfo) {
            return (fieldInfo.name.equals(finalUniqFieldName)) ? Status.YES : Status.NO;
          }
        };

    TermsEnum termsEnum = null;

    while (iter.hasNext()) {
      Integer docId = iter.next();
      NamedList<Object> docNL = new NamedList<Object>();

      if (keyField != null) {
        reader.document(docId, getUniqValue);
        String uniqVal = null;
        if (uniqValues.size() != 0) {
          uniqVal = uniqValues.get(0);
          uniqValues.clear();
          docNL.add("uniqueKey", uniqVal);
          termVectors.add(uniqVal, docNL);
        }
      } else {
        // support for schemas w/o a unique key,
        termVectors.add("doc-" + docId, docNL);
      }

      if (null != fields) {
        for (Map.Entry<String, FieldOptions> entry : fieldOptions.entrySet()) {
          final String field = entry.getKey();
          final Terms vector = reader.getTermVector(docId, field);
          if (vector != null) {
            termsEnum = vector.iterator(termsEnum);
            mapOneVector(docNL, entry.getValue(), reader, docId, vector.iterator(termsEnum), field);
          }
        }
      } else {
        // extract all fields
        final Fields vectors = reader.getTermVectors(docId);
        for (String field : vectors) {
          Terms terms = vectors.terms(field);
          if (terms != null) {
            termsEnum = terms.iterator(termsEnum);
            mapOneVector(docNL, allFields, reader, docId, termsEnum, field);
          }
        }
      }
    }
  }
  @Override
  public void process(ResponseBuilder rb) throws IOException {
    SolrParams params = rb.req.getParams();
    if (!params.getBool(COMPONENT_NAME, false)) {
      return;
    }

    NamedList termVectors = new NamedList();
    rb.rsp.add(TERM_VECTORS, termVectors);
    FieldOptions allFields = new FieldOptions();
    // figure out what options we have, and try to get the appropriate vector
    allFields.termFreq = params.getBool(TermVectorParams.TF, false);
    allFields.positions = params.getBool(TermVectorParams.POSITIONS, false);
    allFields.offsets = params.getBool(TermVectorParams.OFFSETS, false);
    allFields.docFreq = params.getBool(TermVectorParams.DF, false);
    allFields.tfIdf = params.getBool(TermVectorParams.TF_IDF, false);
    // boolean cacheIdf = params.getBool(TermVectorParams.IDF, false);
    // short cut to all values.
    boolean all = params.getBool(TermVectorParams.ALL, false);
    if (all == true) {
      allFields.termFreq = true;
      allFields.positions = true;
      allFields.offsets = true;
      allFields.docFreq = true;
      allFields.tfIdf = true;
    }

    String fldLst = params.get(TermVectorParams.FIELDS);
    if (fldLst == null) {
      fldLst = params.get(CommonParams.FL);
    }

    // use this to validate our fields
    IndexSchema schema = rb.req.getSchema();
    // Build up our per field mapping
    Map<String, FieldOptions> fieldOptions = new HashMap<String, FieldOptions>();
    NamedList warnings = new NamedList();
    List<String> noTV = new ArrayList<String>();
    List<String> noPos = new ArrayList<String>();
    List<String> noOff = new ArrayList<String>();

    // we have specific fields to retrieve
    if (fldLst != null) {
      String[] fields = SolrPluginUtils.split(fldLst);
      for (String field : fields) {
        SchemaField sf = schema.getFieldOrNull(field);
        if (sf != null) {
          if (sf.storeTermVector()) {
            FieldOptions option = fieldOptions.get(field);
            if (option == null) {
              option = new FieldOptions();
              option.fieldName = field;
              fieldOptions.put(field, option);
            }
            // get the per field mappings
            option.termFreq = params.getFieldBool(field, TermVectorParams.TF, allFields.termFreq);
            option.docFreq = params.getFieldBool(field, TermVectorParams.DF, allFields.docFreq);
            option.tfIdf = params.getFieldBool(field, TermVectorParams.TF_IDF, allFields.tfIdf);
            // Validate these are even an option
            option.positions =
                params.getFieldBool(field, TermVectorParams.POSITIONS, allFields.positions);
            if (option.positions == true && sf.storeTermPositions() == false) {
              noPos.add(field);
            }
            option.offsets =
                params.getFieldBool(field, TermVectorParams.OFFSETS, allFields.offsets);
            if (option.offsets == true && sf.storeTermOffsets() == false) {
              noOff.add(field);
            }
          } else { // field doesn't have term vectors
            noTV.add(field);
          }
        } else {
          // field doesn't exist
          throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "undefined field: " + field);
        }
      }
    } // else, deal with all fields
    boolean hasWarnings = false;
    if (noTV.isEmpty() == false) {
      warnings.add("noTermVectors", noTV);
      hasWarnings = true;
    }
    if (noPos.isEmpty() == false) {
      warnings.add("noPositions", noPos);
      hasWarnings = true;
    }
    if (noOff.isEmpty() == false) {
      warnings.add("noOffsets", noOff);
      hasWarnings = true;
    }
    if (hasWarnings == true) {
      termVectors.add("warnings", warnings);
    }

    DocListAndSet listAndSet = rb.getResults();
    List<Integer> docIds = getInts(params.getParams(TermVectorParams.DOC_IDS));
    Iterator<Integer> iter;
    if (docIds != null && docIds.isEmpty() == false) {
      iter = docIds.iterator();
    } else {
      DocList list = listAndSet.docList;
      iter = list.iterator();
    }
    SolrIndexSearcher searcher = rb.req.getSearcher();

    IndexReader reader = searcher.getReader();
    // the TVMapper is a TermVectorMapper which can be used to optimize loading of Term Vectors
    SchemaField keyField = schema.getUniqueKeyField();
    String uniqFieldName = null;
    if (keyField != null) {
      uniqFieldName = keyField.getName();
    }
    // Only load the id field to get the uniqueKey of that field
    SetBasedFieldSelector fieldSelector =
        new SetBasedFieldSelector(
            Collections.singleton(uniqFieldName), Collections.<String>emptySet());
    TVMapper mapper = new TVMapper(reader);
    mapper.fieldOptions =
        allFields; // this will only stay set if fieldOptions.isEmpty() (in other words, only if the
                   // user didn't set any fields)
    while (iter.hasNext()) {
      Integer docId = iter.next();
      NamedList docNL = new NamedList();
      mapper.docNL = docNL;
      termVectors.add("doc-" + docId, docNL);

      if (keyField != null) {
        Document document = reader.document(docId, fieldSelector);
        Fieldable uniqId = document.getFieldable(uniqFieldName);
        String uniqVal = null;
        if (uniqId != null) {
          uniqVal = keyField.getType().storedToReadable(uniqId);
        }
        if (uniqVal != null) {
          docNL.add("uniqueKey", uniqVal);
          termVectors.add("uniqueKeyFieldName", uniqFieldName);
        }
      }
      if (fieldOptions.isEmpty() == false) {
        for (Map.Entry<String, FieldOptions> entry : fieldOptions.entrySet()) {
          mapper.fieldOptions = entry.getValue();
          reader.getTermFreqVector(docId, entry.getKey(), mapper);
        }
      } else {
        // deal with all fields by using the allFieldMapper
        reader.getTermFreqVector(docId, mapper);
      }
    }
  }