Java tutorial
/* * Copyright (c) 2011 LinkedIn, Inc * * Licensed 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 com.flaptor.indextank.api.resources; import java.io.UnsupportedEncodingException; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.logging.Logger; import javax.servlet.http.HttpServletResponse; import org.json.simple.JSONArray; import org.json.simple.JSONObject; import com.flaptor.indextank.api.IndexEngineApi; import com.flaptor.indextank.api.IndexEngineApiException; import com.flaptor.indextank.api.util.QueryHelper; import com.flaptor.indextank.rpc.CategoryFilter; import com.flaptor.indextank.rpc.RangeFilter; import com.flaptor.indextank.search.SearchResult; import com.flaptor.indextank.search.SearchResults; import com.ghosthack.turismo.action.Action; import com.google.common.collect.Lists; import com.google.common.collect.Maps; import com.google.common.collect.Multiset; public class Search extends Action { /** * @see java.lang.Runnable#run() */ public void run() { IndexEngineApi api = (IndexEngineApi) ctx().getAttribute("api"); HttpServletResponse res = res(); String characterEncoding = api.getCharacterEncoding(); try { req().setCharacterEncoding(characterEncoding); res.setCharacterEncoding(characterEncoding); res.setContentType("application/json"); } catch (UnsupportedEncodingException ignored) { } String q = params("q"); String fetchVariables = params("fetch_variables"); String fetchCategories = params("fetch_categories"); String fetch = params("fetch"); String snippet = params("snippet"); int start = QueryHelper.parseIntParam(params("start"), 0); int len = QueryHelper.parseIntParam(params("len"), 10); int function = QueryHelper.parseIntParam(params("function"), 0); Map<Integer, Double> vars = Maps.newHashMap(); List<CategoryFilter> facetFilters = Lists.newArrayList(); List<RangeFilter> variableRangeFilters = Lists.newArrayList(); List<RangeFilter> functionRangeFilters = Lists.newArrayList(); Map<String, String> extras = createExtraParameters(fetch, snippet, fetchVariables, fetchCategories); try { long t0 = System.currentTimeMillis(); SearchResults results = api.search(q, start, len, function, vars, facetFilters, variableRangeFilters, functionRangeFilters, extras); long t1 = System.currentTimeMillis(); double searchTime = (t1 - t0) / 1000; int matches = results.getMatches(); Map<String, Map<String, Integer>> facets = toFacets(results.getFacets()); String didYouMean = results.getDidYouMean(); JSONArray ja = new JSONArray(); for (SearchResult result : results.getResults()) { addResult(ja, result); } JSONObject jo = createResponse(q, searchTime, ja, matches, facets, didYouMean); print(jo.toJSONString()); return; } catch (IndexEngineApiException e) { e.printStackTrace(); } res.setStatus(503); print("Service unavailable"); // TODO: descriptive error msg } @SuppressWarnings("unchecked") private JSONObject createResponse(String q, double searchTime, JSONArray ja, int matches, Map<String, Map<String, Integer>> facets, String didYouMean) { JSONObject jo = new JSONObject(); jo.put("query", q); jo.put("results", ja); jo.put("matches", matches); jo.put("facets", facets); if (didYouMean != null) { jo.put("didyoumean", didYouMean); } jo.put("search_time", String.format("%.3f", searchTime)); return jo; } private Map<String, String> createExtraParameters(String fetch, String snippet, String fetchVariables, String fetchCategories) { Map<String, String> extras = Maps.newHashMap(); if ("true".equalsIgnoreCase(fetchVariables) || "*".equals(fetchVariables)) { if (LOG_ENABLED) LOG.fine("Fetch variables: all"); extras.put("fetch_variables", "*"); } if ("true".equalsIgnoreCase(fetchCategories) || "*".equals(fetchCategories)) { if (LOG_ENABLED) LOG.fine("Fetch categories: all"); extras.put("fetch_categories", "*"); } if (fetch != null) { if (LOG_ENABLED) LOG.fine("Fetch fields: " + fetch); extras.put("fetch_fields", fetch); } if (snippet != null) { if (LOG_ENABLED) LOG.fine("Fetch snippets: " + snippet); extras.put("snippet_fields", snippet); } return extras; } @SuppressWarnings("unchecked") private void addResult(JSONArray ja, SearchResult result) { JSONObject document = new JSONObject(); document.putAll(result.getFields()); document.put("docid", result.getDocId()); document.put("query_relevance_score", result.getScore()); for (Entry<Integer, Double> entry : result.getVariables().entrySet()) { document.put("variable_" + entry.getKey(), entry.getValue()); } for (Entry<String, String> entry : result.getCategories().entrySet()) { document.put("category_" + entry.getKey(), entry.getValue()); } ja.add(document); } @SuppressWarnings("unchecked") private static Map<String, Map<String, Integer>> toFacets(Map<String, Multiset<String>> facets) { JSONObject results = new JSONObject(); for (Entry<String, Multiset<String>> entry : facets.entrySet()) { JSONObject value = new JSONObject(); for (String catValue : entry.getValue()) { value.put(catValue, entry.getValue().count(catValue)); } results.put(entry.getKey(), value); } return results; } private static final Logger LOG = Logger.getLogger(Search.class.getName()); private static final boolean LOG_ENABLED = true; }