| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.solr.client.solrj.io.stream; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.nio.charset.StandardCharsets; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.solr.client.solrj.SolrClient; |
| import org.apache.solr.client.solrj.SolrRequest; |
| import org.apache.solr.client.solrj.SolrServerException; |
| import org.apache.solr.client.solrj.impl.InputStreamResponseParser; |
| import org.apache.solr.client.solrj.request.QueryRequest; |
| import org.apache.solr.common.params.ModifiableSolrParams; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.common.util.NamedList; |
| import org.noggit.JSONParser; |
| import org.noggit.ObjectBuilder; |
| |
| |
| /* |
| Queries a Solr instance, and maps SolrDocs to Tuples. |
| Initial version works with the json format and only SolrDocs are handled. |
| */ |
| |
| public class JSONTupleStream implements TupleStreamParser { |
| private List<String> path; // future... for more general stream handling |
| private Reader reader; |
| private JSONParser parser; |
| private boolean atDocs; |
| |
| public JSONTupleStream(Reader reader) { |
| this.reader = reader; |
| this.parser = new JSONParser(reader); |
| } |
| |
| // temporary... |
| public static JSONTupleStream create(SolrClient server, SolrParams requestParams) throws IOException, SolrServerException { |
| String p = requestParams.get("qt"); |
| if(p != null) { |
| ModifiableSolrParams modifiableSolrParams = (ModifiableSolrParams) requestParams; |
| modifiableSolrParams.remove("qt"); |
| } |
| |
| QueryRequest query = new QueryRequest( requestParams ); |
| query.setPath(p); |
| query.setResponseParser(new InputStreamResponseParser("json")); |
| query.setMethod(SolrRequest.METHOD.POST); |
| NamedList<Object> genericResponse = server.request(query); |
| InputStream stream = (InputStream)genericResponse.get("stream"); |
| InputStreamReader reader = new InputStreamReader(stream, StandardCharsets.UTF_8); |
| return new JSONTupleStream(reader); |
| } |
| |
| |
| /** returns the next Tuple or null */ |
| @Override |
| @SuppressWarnings({"unchecked"}) |
| public Map<String,Object> next() throws IOException { |
| if (!atDocs) { |
| boolean found = advanceToDocs(); |
| atDocs = true; |
| if (!found) return null; |
| } |
| // advance past ARRAY_START (in the case that we just advanced to docs, or OBJECT_END left over from the last call. |
| int event = parser.nextEvent(); |
| if (event == JSONParser.ARRAY_END) return null; |
| |
| Object o = ObjectBuilder.getVal(parser); |
| // right now, getVal will leave the last event read as OBJECT_END |
| |
| return (Map<String,Object>)o; |
| } |
| |
| public void close() throws IOException { |
| reader.close(); |
| } |
| |
| |
| private void expect(int parserEventType) throws IOException { |
| int event = parser.nextEvent(); |
| if (event != parserEventType) { |
| throw new IOException("JSONTupleStream: expected " + JSONParser.getEventString(parserEventType) + " but got " + JSONParser.getEventString(event) ); |
| } |
| } |
| |
| private void expect(String mapKey) { |
| |
| |
| } |
| |
| private boolean advanceToMapKey(String key, boolean deepSearch) throws IOException { |
| for (;;) { |
| int event = parser.nextEvent(); |
| switch (event) { |
| case JSONParser.STRING: |
| if (key != null) { |
| String val = parser.getString(); |
| if (key.equals(val)) { |
| return true; |
| } else if("error".equals(val)) { |
| handleError(); |
| } |
| } |
| break; |
| case JSONParser.OBJECT_END: |
| return false; |
| case JSONParser.OBJECT_START: |
| if (deepSearch) { |
| boolean found = advanceToMapKey(key, true); |
| if (found) { |
| return true; |
| } |
| } else { |
| advanceToMapKey(null, false); |
| } |
| break; |
| case JSONParser.ARRAY_START: |
| skipArray(key, deepSearch); |
| break; |
| } |
| } |
| } |
| |
| private void handleError() throws IOException { |
| for (;;) { |
| int event = parser.nextEvent(); |
| if(event == JSONParser.STRING) { |
| String val = parser.getString(); |
| if("msg".equals(val)) { |
| event = parser.nextEvent(); |
| if(event == JSONParser.STRING) { |
| String msg = parser.getString(); |
| if(msg != null) { |
| throw new SolrStream.HandledException(msg); |
| } |
| } |
| } |
| } else if (event == JSONParser.OBJECT_END) { |
| throw new IOException(""); |
| } |
| } |
| } |
| |
| private void skipArray(String key, boolean deepSearch) throws IOException { |
| for (;;) { |
| int event = parser.nextEvent(); |
| switch (event) { |
| case JSONParser.OBJECT_START: |
| advanceToMapKey(key, deepSearch); |
| break; |
| case JSONParser.ARRAY_START: |
| skipArray(key, deepSearch); |
| break; |
| case JSONParser.ARRAY_END: |
| return; |
| } |
| } |
| } |
| |
| |
| private boolean advanceToDocs() throws IOException { |
| expect(JSONParser.OBJECT_START); |
| boolean found = advanceToMapKey("docs", true); |
| expect(JSONParser.ARRAY_START); |
| return found; |
| } |
| |
| |
| |
| } |