/**
* Prepare a document reconstructor.
*
* @param reader IndexReader to read from.
* @param fieldNames if non-null or not empty, data will be collected only from these fields,
* otherwise data will be collected from all fields
* @param numTerms total number of terms in the index, or -1 if unknown (will be calculated)
* @throws Exception
*/
public DocReconstructor(IndexReader reader, String[] fieldNames, int numTerms) throws Exception {
if (reader == null) {
throw new Exception("IndexReader cannot be null.");
}
this.reader = reader;
if (fieldNames == null || fieldNames.length == 0) {
// collect fieldNames
this.fieldNames = (String[]) reader.getFieldNames(FieldOption.ALL).toArray(new String[0]);
} else {
this.fieldNames = fieldNames;
}
if (numTerms == -1) {
Fields fields = MultiFields.getFields(reader);
numTerms = 0;
FieldsEnum fe = fields.iterator();
String fld = null;
while ((fld = fe.next()) != null) {
TermsEnum te = fe.terms();
while (te.next() != null) {
numTerms++;
}
}
this.numTerms = numTerms;
}
deleted = MultiFields.getDeletedDocs(reader);
}
private Fields generateTermVectors(
Collection<GetField> getFields,
boolean withOffsets,
@Nullable Map<String, String> perFieldAnalyzer)
throws IOException {
/* store document in memory index */
MemoryIndex index = new MemoryIndex(withOffsets);
for (GetField getField : getFields) {
String field = getField.getName();
Analyzer analyzer = getAnalyzerAtField(field, perFieldAnalyzer);
for (Object text : getField.getValues()) {
index.addField(field, text.toString(), analyzer);
}
}
/* and read vectors from it */
return MultiFields.getFields(index.createSearcher().getIndexReader());
}
public TermVectorResponse getTermVector(TermVectorRequest request, String concreteIndex) {
final Engine.Searcher searcher = indexShard.acquireSearcher("term_vector");
IndexReader topLevelReader = searcher.reader();
final TermVectorResponse termVectorResponse =
new TermVectorResponse(concreteIndex, request.type(), request.id());
final Term uidTerm =
new Term(UidFieldMapper.NAME, Uid.createUidAsBytes(request.type(), request.id()));
Engine.GetResult get = indexShard.get(new Engine.Get(request.realtime(), uidTerm));
boolean docFromTranslog = get.source() != null;
AggregatedDfs dfs = null;
/* fetched from translog is treated as an artificial document */
if (docFromTranslog) {
request.doc(get.source().source, false);
termVectorResponse.setDocVersion(get.version());
}
/* handle potential wildcards in fields */
if (request.selectedFields() != null) {
handleFieldWildcards(request);
}
try {
Fields topLevelFields = MultiFields.getFields(topLevelReader);
Versions.DocIdAndVersion docIdAndVersion = get.docIdAndVersion();
/* from an artificial document */
if (request.doc() != null) {
Fields termVectorsByField = generateTermVectorsFromDoc(request, !docFromTranslog);
// if no document indexed in shard, take the queried document itself for stats
if (topLevelFields == null) {
topLevelFields = termVectorsByField;
}
if (termVectorsByField != null && useDfs(request)) {
dfs = getAggregatedDfs(termVectorsByField, request);
}
termVectorResponse.setFields(
termVectorsByField, request.selectedFields(), request.getFlags(), topLevelFields, dfs);
termVectorResponse.setExists(true);
termVectorResponse.setArtificial(!docFromTranslog);
}
/* or from an existing document */
else if (docIdAndVersion != null) {
// fields with stored term vectors
Fields termVectorsByField =
docIdAndVersion.context.reader().getTermVectors(docIdAndVersion.docId);
Set<String> selectedFields = request.selectedFields();
// generate tvs for fields where analyzer is overridden
if (selectedFields == null && request.perFieldAnalyzer() != null) {
selectedFields = getFieldsToGenerate(request.perFieldAnalyzer(), termVectorsByField);
}
// fields without term vectors
if (selectedFields != null) {
termVectorsByField =
addGeneratedTermVectors(get, termVectorsByField, request, selectedFields);
}
if (termVectorsByField != null && useDfs(request)) {
dfs = getAggregatedDfs(termVectorsByField, request);
}
termVectorResponse.setFields(
termVectorsByField, request.selectedFields(), request.getFlags(), topLevelFields, dfs);
termVectorResponse.setDocVersion(docIdAndVersion.version);
termVectorResponse.setExists(true);
} else {
termVectorResponse.setExists(false);
}
} catch (Throwable ex) {
throw new ElasticsearchException("failed to execute term vector request", ex);
} finally {
searcher.close();
get.release();
}
return termVectorResponse;
}
public static void main(String[] args) throws IOException {
IndexReader reader = null;
/*
* Opening the index first simplifies the processing of the
* rest of the command line arguments.
*/
for (int i = 0; i < args.length; i++) {
if (("-index".equals(args[i])) && ((i + 1) < args.length)) {
reader = DirectoryReader.open(FSDirectory.open(new File(args[i + 1])));
if (reader == null) {
System.err.println("Error: Can't open index " + args[i + 1]);
System.exit(1);
}
;
break;
}
;
}
;
if (reader == null) {
System.err.println(usage);
System.exit(1);
}
;
/*
* Process the command line arguments sequentially.
*/
for (int i = 0; i < args.length; i++) {
if ("-index".equals(args[i])) {
/*
* Handled in the previous loop, so just skip the argument.
*/
i++;
} else if ("-list-edocid".equals(args[i])) {
System.out.println("-list-edocid:");
if ((i + 1) >= args.length) {
System.out.println(usage);
break;
}
;
Document d = reader.document(Integer.parseInt(args[i + 1]));
System.out.println(
"Internal docid --> External docid: " + args[i + 1] + " --> " + d.get("externalId"));
i += 1;
} else if ("-list-docids".equals(args[i])) {
System.out.println("-list-docids:");
for (int j = 0; j < reader.numDocs(); j++) {
Document d = reader.document(j);
System.out.println("Internal --> external docid: " + j + " --> " + d.get("externalId"));
}
;
} else if ("-list-fields".equals(args[i])) {
Fields fields = MultiFields.getFields(reader);
System.out.print("\nNumber of fields: ");
if (fields == null) System.out.println("0");
else {
System.out.println(fields.size());
Iterator<String> is = fields.iterator();
while (is.hasNext()) {
System.out.println("\t" + is.next());
}
;
}
;
} else if ("-list-postings".equals(args[i])) {
if ((i + 2) >= args.length) {
System.out.println(usage);
break;
}
;
listPostings(reader, args[i + 1], args[i + 2], Integer.MAX_VALUE);
i += 2;
} else if ("-list-postings-sample".equals(args[i])) {
if ((i + 2) >= args.length) {
System.out.println(usage);
break;
}
;
listPostings(reader, args[i + 1], args[i + 2], 5);
i += 2;
} else if ("-list-stats".equals(args[i])) {
System.out.println("Corpus statistics:");
System.out.println("\tnumdocs\t\t" + reader.numDocs());
System.out.println(
"\turl:\t"
+ "\tnumdocs="
+ reader.getDocCount("url")
+ "\tsumTotalTF="
+ reader.getSumTotalTermFreq("url")
+ "\tavglen="
+ reader.getSumTotalTermFreq("url") / (float) reader.getDocCount("url"));
System.out.println(
"\tkeywords:"
+ "\tnumdocs="
+ reader.getDocCount("keywords")
+ "\tsumTotalTF="
+ reader.getSumTotalTermFreq("keywords")
+ "\tavglen="
+ reader.getSumTotalTermFreq("keywords") / (float) reader.getDocCount("keywords"));
System.out.println(
"\ttitle:\t"
+ "\tnumdocs="
+ reader.getDocCount("title")
+ "\tsumTotalTF="
+ reader.getSumTotalTermFreq("title")
+ "\tavglen="
+ reader.getSumTotalTermFreq("title") / (float) reader.getDocCount("title"));
System.out.println(
"\tbody:\t"
+ "\tnumdocs="
+ reader.getDocCount("body")
+ "\tsumTotalTF="
+ reader.getSumTotalTermFreq("body")
+ "\tavglen="
+ reader.getSumTotalTermFreq("body") / (float) reader.getDocCount("body"));
System.out.println(
"\tinlink:\t"
+ "\tnumdocs="
+ reader.getDocCount("inlink")
+ "\tsumTotalTF="
+ reader.getSumTotalTermFreq("inlink")
+ "\tavglen="
+ reader.getSumTotalTermFreq("inlink") / (float) reader.getDocCount("inlink"));
} else if ("-list-terms".equals(args[i])) {
if ((i + 1) >= args.length) {
System.out.println(usage);
break;
}
;
listTermDictionary(reader, args[i + 1]);
i += 1;
} else if ("-list-termvector".equals(args[i])) {
if ((i + 1) >= args.length) {
System.out.println(usage);
break;
}
;
listTermVectors(reader, args[i + 1]);
i += 1;
} else if ("-list-termvector-field".equals(args[i])) {
if ((i + 2) >= args.length) {
System.out.println(usage);
break;
}
;
listTermVectorField(reader, args[i + 1], args[i + 2]);
i += 2;
} else System.err.println("\nWarning: Unknown argument " + args[i] + " ignored.");
}
;
/*
* Close the index and exit gracefully.
*/
reader.close();
}
