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Adjusted yjson Solr writer to support responses from an external Solr

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Worked previously only with responses from YaCy embedded Solr, now able
to render the response when YaCy is configured to use an external Solr
index.
pull/218/head
luccioman 7 years ago
parent 87bd17b1cf
commit 373edf9eac
1 changed files with 386 additions and 152 deletions
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538
source/net/yacy/cora/federate/solr/responsewriter/YJsonResponseWriter.java
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@ -30,18 +30,13 @@ import java.util.LinkedHashSet;
import java.util.List; import java.util.List;
import java.util.Locale; import java.util.Locale;
import java.util.Map; import java.util.Map;
import java.util.Map.Entry;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.federate.solr.responsewriter.OpensearchResponseWriter.ResHead;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.cora.util.JSONObject;
import net.yacy.crawler.retrieval.Response;
import net.yacy.search.schema.CollectionConfiguration;
import net.yacy.search.schema.CollectionSchema;
import org.apache.lucene.document.Document; import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexableField; import org.apache.lucene.index.IndexableField;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.util.NamedList; import org.apache.solr.common.util.NamedList;
import org.apache.solr.common.util.SimpleOrderedMap; import org.apache.solr.common.util.SimpleOrderedMap;
import org.apache.solr.request.SolrQueryRequest; import org.apache.solr.request.SolrQueryRequest;
@ -52,6 +47,15 @@ import org.apache.solr.search.DocIterator;
import org.apache.solr.search.DocList; import org.apache.solr.search.DocList;
import org.apache.solr.search.SolrIndexSearcher; import org.apache.solr.search.SolrIndexSearcher;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.federate.solr.responsewriter.OpensearchResponseWriter.ResHead;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.cora.util.JSONObject;
import net.yacy.crawler.retrieval.Response;
import net.yacy.search.schema.CollectionConfiguration;
import net.yacy.search.schema.CollectionSchema;
/** /**
* write the opensearch result in YaCys special way to include as much as in opensearch is included. * write the opensearch result in YaCys special way to include as much as in opensearch is included.
* This will also include YaCy facets. * This will also include YaCy facets.
@ -59,10 +63,10 @@ import org.apache.solr.search.SolrIndexSearcher;
* example: * example:
* http://localhost:8090/solr/select?hl=false&wt=yjson&facet=true&facet.mincount=1&facet.field=host_s&facet.field=url_file_ext_s&facet.field=url_protocol_s&facet.field=author_sxt&facet.field=collection_sxt&start=0&rows=10&query=www * http://localhost:8090/solr/select?hl=false&wt=yjson&facet=true&facet.mincount=1&facet.field=host_s&facet.field=url_file_ext_s&facet.field=url_protocol_s&facet.field=author_sxt&facet.field=collection_sxt&start=0&rows=10&query=www
*/ */
public class YJsonResponseWriter implements QueryResponseWriter, EmbeddedSolrResponseWriter { public class YJsonResponseWriter implements QueryResponseWriter, SolrjResponseWriter {
// define a list of simple YaCySchema -> json Token matchings // define a list of simple YaCySchema -> json Token matchings
private static final Map<String, String> field2tag = new HashMap<String, String>(); private static final Map<String, String> field2tag = new HashMap<>();
static { static {
field2tag.put(CollectionSchema.url_protocol_s.getSolrFieldName(), "protocol"); field2tag.put(CollectionSchema.url_protocol_s.getSolrFieldName(), "protocol");
field2tag.put(CollectionSchema.host_s.getSolrFieldName(), "host"); field2tag.put(CollectionSchema.host_s.getSolrFieldName(), "host");
@ -87,17 +91,41 @@ public class YJsonResponseWriter implements QueryResponseWriter, EmbeddedSolrRes
@Override @Override
public void init(@SuppressWarnings("rawtypes") NamedList n) { public void init(@SuppressWarnings("rawtypes") NamedList n) {
} }
@Override @Override
public void write(final Writer writer, final SolrQueryRequest request, final SolrQueryResponse rsp) throws IOException { public void write(final Writer writer, final SolrQueryRequest request, final SolrQueryResponse rsp) throws IOException {
final NamedList<?> values = rsp.getValues();
final Object responseObj = rsp.getResponse();
write(writer, request, values, responseObj);
}
@Override
public void write(Writer writer, SolrQueryRequest request, String coreName, QueryResponse rsp) throws IOException {
final NamedList<Object> values = rsp.getResponse();
final SolrDocumentList documents = rsp.getResults();
write(writer, request, values, documents);
}
/**
* Append to the writer the YaCy json representation of the Solr results.
* @param writer an open output writer. Must not be null.
* @param request the initial Solr request. Must not be null.
* @param values the response values. Must not be null.
* @param rsp the Solr response header.
* @throws IOException when a write error occurred
*/
private void write(final Writer writer, final SolrQueryRequest request, final NamedList<?> values,
final Object responseObj) throws IOException {
NamedList<?> values = rsp.getValues();
assert values.get("responseHeader") != null;
assert values.get("response") != null; assert values.get("response") != null;
SimpleOrderedMap<Object> responseHeader = (SimpleOrderedMap<Object>) rsp.getResponseHeader();
DocList response = ((ResultContext) values.get("response")).getDocList();
@SuppressWarnings("unchecked") @SuppressWarnings("unchecked")
SimpleOrderedMap<Object> facetCounts = (SimpleOrderedMap<Object>) values.get("facet_counts"); SimpleOrderedMap<Object> facetCounts = (SimpleOrderedMap<Object>) values.get("facet_counts");
@SuppressWarnings("unchecked") @SuppressWarnings("unchecked")
@ -107,152 +135,44 @@ public class YJsonResponseWriter implements QueryResponseWriter, EmbeddedSolrRes
Map<String, LinkedHashSet<String>> snippets = OpensearchResponseWriter.highlighting(highlighting); Map<String, LinkedHashSet<String>> snippets = OpensearchResponseWriter.highlighting(highlighting);
// parse response header // parse response header
ResHead resHead = new ResHead(); final ResHead resHead = new ResHead();
NamedList<?> val0 = (NamedList<?>) responseHeader.get("params"); resHead.rows = request.getOriginalParams().getLong("rows", -1);
resHead.rows = Long.parseLong((String) val0.get("rows"));
resHead.offset = response.offset(); // equal to 'start'
resHead.numFound = response.matches();
String jsonp = request.getParams().get("callback"); // check for JSONP String jsonp = request.getParams().get("callback"); // check for JSONP
if (jsonp != null) { if (jsonp != null) {
writer.write(jsonp.toCharArray()); writer.write(jsonp.toCharArray());
writer.write("([".toCharArray()); writer.write("([".toCharArray());
} }
// write header if(responseObj instanceof ResultContext){
writer.write(("{\"channels\": [{\n").toCharArray()); /* Regular response object */
solitaireTag(writer, "totalResults", Long.toString(resHead.numFound)); final DocList documents = ((ResultContext)responseObj).getDocList();
solitaireTag(writer, "startIndex", Long.toString(resHead.offset));
solitaireTag(writer, "itemsPerPage", Long.toString(resHead.rows));
solitaireTag(writer, "title", this.title);
solitaireTag(writer, "description", "Search Result");
writer.write("\"items\": [\n".toCharArray());
// parse body
final int responseCount = response.size();
SolrIndexSearcher searcher = request.getSearcher();
DocIterator iterator = response.iterator();
for (int i = 0; i < responseCount; i++) {
try {
writer.write("{\n".toCharArray());
int id = iterator.nextDoc();
Document doc = searcher.doc(id, OpensearchResponseWriter.SOLR_FIELDS);
List<IndexableField> fields = doc.getFields();
int fieldc = fields.size();
MultiProtocolURL url = null;
String urlhash = null;
List<String> descriptions = new ArrayList<String>();
String title = "";
StringBuilder path = new StringBuilder(80);
List<Object> images_protocol_obj = new ArrayList<>();
List<String> images_stub = new ArrayList<>();
for (int j = 0; j < fieldc; j++) { resHead.offset = documents.offset(); // equal to 'start' Solr param
IndexableField value = fields.get(j); resHead.numFound = documents.matches();
String fieldName = value.name();
// apply generic matching rule
String stag = field2tag.get(fieldName);
if (stag != null) {
solitaireTag(writer, stag, value.stringValue());
continue;
}
// some special handling here
if (CollectionSchema.sku.getSolrFieldName().equals(fieldName)) {
String u = value.stringValue();
try {
url = new MultiProtocolURL(u);
String filename = url.getFileName();
solitaireTag(writer, "link", u);
solitaireTag(writer, "file", filename);
} catch (final MalformedURLException e) {}
continue;
}
if (CollectionSchema.title.getSolrFieldName().equals(fieldName)) {
title = value.stringValue();
continue;
}
if (CollectionSchema.description_txt.getSolrFieldName().equals(fieldName)) {
String description = value.stringValue();
descriptions.add(description);
continue;
}
if (CollectionSchema.id.getSolrFieldName().equals(fieldName)) {
urlhash = value.stringValue();
solitaireTag(writer, "guid", urlhash);
continue;
}
if (CollectionSchema.url_paths_sxt.getSolrFieldName().equals(fieldName)) {
path.append('/').append(value.stringValue());
continue;
}
if (CollectionSchema.last_modified.getSolrFieldName().equals(fieldName)) {
Date d = new Date(Long.parseLong(value.stringValue()));
solitaireTag(writer, "pubDate", HeaderFramework.formatRFC1123(d));
continue;
}
if (CollectionSchema.size_i.getSolrFieldName().equals(fieldName)) {
int size = value.stringValue() != null && value.stringValue().length() > 0 ? Integer.parseInt(value.stringValue()) : -1;
int sizekb = size / 1024;
int sizemb = sizekb / 1024;
solitaireTag(writer, "size", value.stringValue());
solitaireTag(writer, "sizename", sizemb > 0 ? (Integer.toString(sizemb) + " mbyte") : sizekb > 0 ? (Integer.toString(sizekb) + " kbyte") : (Integer.toString(size) + " byte"));
continue;
}
if (CollectionSchema.last_modified.getSolrFieldName().equals(fieldName)) {
Date d = new Date(Long.parseLong(value.stringValue()));
solitaireTag(writer, "pubDate", HeaderFramework.formatRFC1123(d));
continue;
}
if (CollectionSchema.images_protocol_sxt.getSolrFieldName().equals(fieldName)) {
images_protocol_obj.add(value.stringValue());
continue;
}
if (CollectionSchema.images_urlstub_sxt.getSolrFieldName().equals(fieldName)) {
images_stub.add(value.stringValue());
continue;
}
//missing: "code","faviconCode"
}
if (Math.min(images_protocol_obj.size(), images_stub.size()) > 0) {
List<String> images_protocol = CollectionConfiguration.indexedList2protocolList(images_protocol_obj, images_stub.size());
String imageurl = images_protocol.get(0) + "://" + images_stub.get(0);
solitaireTag(writer, "image", imageurl);
} else {
if (url != null && Response.docTypeExt(MultiProtocolURL.getFileExtension(url.getFile()).toLowerCase(Locale.ROOT)) == Response.DT_IMAGE) {
solitaireTag(writer, "image", url.toNormalform(true));
}
}
// compute snippet from texts writeHeader(writer, resHead);
solitaireTag(writer, "path", path.toString());
solitaireTag(writer, "title", title.length() == 0 ? path.toString() : title.replaceAll("\"", "'")); writeDocs(writer, documents, request, snippets);
LinkedHashSet<String> snippet = urlhash == null ? null : snippets.get(urlhash); } else if(responseObj instanceof SolrDocumentList) {
if (snippet == null) {snippet = new LinkedHashSet<>(); snippet.addAll(descriptions);} /*
OpensearchResponseWriter.removeSubsumedTitle(snippet, title); * The response object can be a SolrDocumentList when the response is partial,
String snippetstring = snippet == null || snippet.size() == 0 ? (descriptions.size() > 0 ? descriptions.get(0) : "") : OpensearchResponseWriter.getLargestSnippet(snippet); * for example when the allowed processing time has been exceeded
if (snippetstring != null && snippetstring.length() > 140) { */
snippetstring = snippetstring.substring(0, 140); final SolrDocumentList documents = ((SolrDocumentList)responseObj);
int sp = snippetstring.lastIndexOf(' ');
if (sp >= 0) snippetstring = snippetstring.substring(0, sp) + " ..."; else snippetstring = snippetstring + "..."; resHead.offset = documents.getStart(); // equal to 'start' Solr param
} resHead.numFound = documents.getNumFound();
writer.write("\"description\":"); writer.write(JSONObject.quote(snippetstring)); writer.write("\n}\n");
if (i < responseCount - 1) { writeHeader(writer, resHead);
writer.write(",\n".toCharArray());
} writeDocs(writer, documents, snippets);
} catch (final Throwable ee) { } else {
ConcurrentLog.logException(ee); throw new IOException("Unable to process Solr response format");
writer.write("\"description\":\"\"\n}\n");
if (i < responseCount - 1) {
writer.write(",\n".toCharArray());
}
}
} }
writer.write("],\n".toCharArray()); writer.write("],\n".toCharArray());
writer.write("\"navigation\":[\n"); writer.write("\"navigation\":[\n");
// the facets can be created with the options &facet=true&facet.mincount=1&facet.field=host_s&facet.field=url_file_ext_s&facet.field=url_protocol_s&facet.field=author_sxt // the facets can be created with the options &facet=true&facet.mincount=1&facet.field=host_s&facet.field=url_file_ext_s&facet.field=url_protocol_s&facet.field=author_sxt
@ -282,7 +202,7 @@ public class YJsonResponseWriter implements QueryResponseWriter, EmbeddedSolrRes
if (filetypes != null) { if (filetypes != null) {
writer.write(facetcount > 0 ? ",\n" : "\n"); writer.write(facetcount > 0 ? ",\n" : "\n");
writer.write("{\"facetname\":\"filetypes\",\"displayname\":\"Filetypes\",\"type\":\"String\",\"min\":\"0\",\"max\":\"0\",\"mean\":\"0\",\"elements\":[\n".toCharArray()); writer.write("{\"facetname\":\"filetypes\",\"displayname\":\"Filetypes\",\"type\":\"String\",\"min\":\"0\",\"max\":\"0\",\"mean\":\"0\",\"elements\":[\n".toCharArray());
List<Map.Entry<String, Integer>> l = new ArrayList<Map.Entry<String,Integer>>(); List<Map.Entry<String, Integer>> l = new ArrayList<>();
for (Map.Entry<String, Integer> e: filetypes) { for (Map.Entry<String, Integer> e: filetypes) {
if (e.getKey().length() <= 6) l.add(e); if (e.getKey().length() <= 6) l.add(e);
if (l.size() >= 16) break; if (l.size() >= 16) break;
@ -335,6 +255,320 @@ public class YJsonResponseWriter implements QueryResponseWriter, EmbeddedSolrRes
writer.write("])".toCharArray()); writer.write("])".toCharArray());
} }
} }
/**
* Append to the writer the header of the YaCy json representation.
* @param writer an open output writer. Must not be null.
* @param resHead the calculated results head. Must not be null.
* @throws IOException when an unexpected error occurred while writing
*/
private void writeHeader(final Writer writer, final ResHead resHead)
throws IOException {
writer.write(("{\"channels\": [{\n").toCharArray());
solitaireTag(writer, "totalResults", Long.toString(resHead.numFound));
solitaireTag(writer, "startIndex", Long.toString(resHead.offset));
solitaireTag(writer, "itemsPerPage", Long.toString(resHead.rows));
solitaireTag(writer, "title", this.title);
solitaireTag(writer, "description", "Search Result");
writer.write("\"items\": [\n".toCharArray());
}
/**
* Append to the writer the OpenSearch RSS representation of Solr documents.
*
* @param writer an open output writer. Must not be null.
* @param documents the documents to render. Must not be null.
* @param snippets Solr computed text snippets (highlighting).
* @throws IOException when an unexpected error occurred while writing
*/
private void writeDocs(final Writer writer, final DocList documents, final SolrQueryRequest request,
final Map<String, LinkedHashSet<String>> snippets) throws IOException {
final SolrIndexSearcher searcher = request.getSearcher();
final DocIterator iterator = documents.iterator();
int writtenDocs = 0;
while(iterator.hasNext()) {
if(writtenDocs > 0) {
writer.write(",\n".toCharArray());
}
try {
writer.write("{\n".toCharArray());
int id = iterator.nextDoc();
Document doc = searcher.doc(id, OpensearchResponseWriter.SOLR_FIELDS);
MultiProtocolURL url = null;
String urlhash = null;
List<String> descriptions = new ArrayList<>();
String docTitle = "";
StringBuilder path = new StringBuilder(80);
List<Object> imagesProtocolObjs = new ArrayList<>();
List<String> imagesStubs = new ArrayList<>();
for (final IndexableField value : doc.getFields()) {
String fieldName = value.name();
// apply generic matching rule
String stag = field2tag.get(fieldName);
if (stag != null) {
solitaireTag(writer, stag, value.stringValue());
continue;
}
// some special handling here
if (CollectionSchema.sku.getSolrFieldName().equals(fieldName)) {
url = writeLink(writer, value.stringValue());
continue;
}
if (CollectionSchema.title.getSolrFieldName().equals(fieldName)) {
docTitle = value.stringValue();
continue;
}
if (CollectionSchema.description_txt.getSolrFieldName().equals(fieldName)) {
String description = value.stringValue();
descriptions.add(description);
continue;
}
if (CollectionSchema.id.getSolrFieldName().equals(fieldName)) {
urlhash = value.stringValue();
solitaireTag(writer, "guid", urlhash);
continue;
}
if (CollectionSchema.url_paths_sxt.getSolrFieldName().equals(fieldName)) {
path.append('/').append(value.stringValue());
continue;
}
if (CollectionSchema.last_modified.getSolrFieldName().equals(fieldName)) {
Date d = new Date(Long.parseLong(value.stringValue()));
solitaireTag(writer, "pubDate", HeaderFramework.formatRFC1123(d));
continue;
}
if (CollectionSchema.size_i.getSolrFieldName().equals(fieldName)) {
int size = value.stringValue() != null && value.stringValue().length() > 0 ? Integer.parseInt(value.stringValue()) : -1;
writeSize(writer, size);
continue;
}
if (CollectionSchema.images_protocol_sxt.getSolrFieldName().equals(fieldName)) {
imagesProtocolObjs.add(value.stringValue());
continue;
}
if (CollectionSchema.images_urlstub_sxt.getSolrFieldName().equals(fieldName)) {
imagesStubs.add(value.stringValue());
continue;
}
//missing: "code","faviconCode"
}
writeDocEnd(writer, snippets, url, urlhash, descriptions, docTitle, path, imagesProtocolObjs,
imagesStubs);
} catch (final Exception ee) {
ConcurrentLog.logException(ee);
writer.write("\"description\":\"\"\n}\n");
}
writtenDocs++;
}
}
/**
* Append to the writer the YaCy json representation of Solr documents.
*
* @param writer an open output writer. Must not be null.
* @param documents the documents to render. Must not be null.
* @param responseCount the number of documents to process
* @param snippets snippets Solr computed text snippets (highlighting).
* @throws IOException when an unexpected error occurred while writing
*/
private void writeDocs(final Writer writer, final SolrDocumentList documents,
final Map<String, LinkedHashSet<String>> snippets) throws IOException {
int writtenDocs = 0;
for (final SolrDocument doc : documents) {
if(writtenDocs > 0) {
writer.write(",\n".toCharArray());
}
try {
writer.write("{\n".toCharArray());
MultiProtocolURL url = null;
String urlhash = null;
List<String> descriptions = new ArrayList<>();
String docTitle = "";
StringBuilder path = new StringBuilder(80);
List<Object> imagesProtocolObjs = new ArrayList<>();
List<String> imagesStubs = new ArrayList<>();
for (final Entry<String, Object> fieldEntry : doc) {
final String fieldName = fieldEntry.getKey();
final Object value = fieldEntry.getValue();
if(value == null) {
continue;
}
// apply generic matching rule
String stag = field2tag.get(fieldName);
if (stag != null) {
solitaireTag(writer, stag, value.toString());
continue;
}
// some special handling here
if (CollectionSchema.sku.getSolrFieldName().equals(fieldName)) {
url = writeLink(writer, value.toString());
continue;
}
if (CollectionSchema.title.getSolrFieldName().equals(fieldName)) {
if(value instanceof Iterable<?>) {
/* Handle multivalued field */
for(final Object valueItem : (Iterable<?>)value) {
docTitle = valueItem.toString();
}
} else {
docTitle = value.toString();
}
continue;
}
if (CollectionSchema.description_txt.getSolrFieldName().equals(fieldName)) {
if(value instanceof Iterable<?>) {
/* Handle multivalued field */
for(final Object valueItem : (Iterable<?>)value) {
final String description = valueItem.toString();
descriptions.add(description);
}
} else {
final String description = value.toString();
descriptions.add(description);
}
continue;
}
if (CollectionSchema.id.getSolrFieldName().equals(fieldName)) {
urlhash = value.toString();
solitaireTag(writer, "guid", urlhash);
continue;
}
if (CollectionSchema.url_paths_sxt.getSolrFieldName().equals(fieldName)) {
if(value instanceof Iterable<?>) {
/* Handle multivalued field */
for(final Object valueItem : (Iterable<?>)value) {
path.append('/').append(valueItem.toString());
}
} else {
path.append('/').append(value.toString());
}
continue;
}
if (CollectionSchema.last_modified.getSolrFieldName().equals(fieldName) && value instanceof Date) {
solitaireTag(writer, "pubDate", HeaderFramework.formatRFC1123((Date)value));
continue;
}
if (CollectionSchema.size_i.getSolrFieldName().equals(fieldName) && value instanceof Integer) {
writeSize(writer, ((Integer)value).intValue());
continue;
}
if (CollectionSchema.images_protocol_sxt.getSolrFieldName().equals(fieldName)) {
if(value instanceof Iterable<?>) {
/* Handle multivalued field */
for(final Object valueItem : (Iterable<?>)value) {
imagesProtocolObjs.add(valueItem.toString());
}
} else {
imagesProtocolObjs.add(value.toString());
}
continue;
}
if (CollectionSchema.images_urlstub_sxt.getSolrFieldName().equals(fieldName)) {
if(value instanceof Iterable<?>) {
/* Handle multivalued field */
for(final Object valueItem : (Iterable<?>)value) {
imagesStubs.add(valueItem.toString());
}
} else {
imagesStubs.add(value.toString());
}
continue;
}
//missing: "code","faviconCode"
}
writeDocEnd(writer, snippets, url, urlhash, descriptions, docTitle, path, imagesProtocolObjs,
imagesStubs);
} catch (final Exception ee) {
ConcurrentLog.logException(ee);
writer.write("\"description\":\"\"\n}\n");
}
writtenDocs++;
}
}
/**
* Append information about the Solr document size to the writer
* @param writer an open output writer. Must not be null.
* @param size the size of the indexed document
* @throws IOException when an unexpected error occurred while writing
*/
private void writeSize(final Writer writer, int size) throws IOException {
int sizekb = size / 1024;
int sizemb = sizekb / 1024;
solitaireTag(writer, "size", Integer.toString(size));
solitaireTag(writer, "sizename", sizemb > 0 ? (Integer.toString(sizemb) + " mbyte") : sizekb > 0 ? (Integer.toString(sizekb) + " kbyte") : (Integer.toString(size) + " byte"));
}
/**
* Append information about the Solr document URL to the writer
* @param writer an open output writer. Must no be null.
* @param sku the Solr document URL as a String.
* @return a MultiProtocolURL instance built from the URL string, or null when the URL string is malformed.
* @throws IOException when an unexpected error occurred while writing
*/
private MultiProtocolURL writeLink(final Writer writer, final String sku)
throws IOException {
MultiProtocolURL url;
try {
url = new MultiProtocolURL(sku);
String filename = url.getFileName();
solitaireTag(writer, "link", sku);
solitaireTag(writer, "file", filename);
} catch (final MalformedURLException e) {
url = null;
}
return url;
}
/**
* Append to the writer the end of the YaCy json representation of the Solr
* document.
*/
private void writeDocEnd(final Writer writer, final Map<String, LinkedHashSet<String>> snippets,
final MultiProtocolURL url, final String urlhash, final List<String> descriptions, final String docTitle, final StringBuilder path,
final List<Object> imagesProtocolObjs, final List<String> imagesStubs) throws IOException {
if (Math.min(imagesProtocolObjs.size(), imagesStubs.size()) > 0) {
List<String> imagesProtocols = CollectionConfiguration.indexedList2protocolList(imagesProtocolObjs, imagesStubs.size());
String imageurl = imagesProtocols.get(0) + "://" + imagesStubs.get(0);
solitaireTag(writer, "image", imageurl);
} else {
if (url != null && Response.docTypeExt(MultiProtocolURL.getFileExtension(url.getFile()).toLowerCase(Locale.ROOT)) == Response.DT_IMAGE) {
solitaireTag(writer, "image", url.toNormalform(true));
}
}
// compute snippet from texts
solitaireTag(writer, "path", path.toString());
solitaireTag(writer, "title", docTitle.length() == 0 ? path.toString() : docTitle.replaceAll("\"", "'"));
LinkedHashSet<String> snippet = urlhash == null ? null : snippets.get(urlhash);
if (snippet == null) {snippet = new LinkedHashSet<>(); snippet.addAll(descriptions);}
OpensearchResponseWriter.removeSubsumedTitle(snippet, docTitle);
String snippetstring = snippet == null || snippet.size() == 0 ? (descriptions.size() > 0 ? descriptions.get(0) : "") : OpensearchResponseWriter.getLargestSnippet(snippet);
if (snippetstring != null && snippetstring.length() > 140) {
snippetstring = snippetstring.substring(0, 140);
int sp = snippetstring.lastIndexOf(' ');
if (sp >= 0) snippetstring = snippetstring.substring(0, sp) + " ..."; else snippetstring = snippetstring + "...";
}
writer.write("\"description\":"); writer.write(JSONObject.quote(snippetstring)); writer.write("\n}\n");
}
public static void solitaireTag(final Writer writer, final String tagname, String value) throws IOException { public static void solitaireTag(final Writer writer, final String tagname, String value) throws IOException {
if (value == null) return; if (value == null) return;

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