[8609] | 1 | /*
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| 2 | * Created on Oct 27, 2004
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| 3 | * Copyright (C) Andrea Schweer, 2004
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| 4 | *
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| 5 | * This file is part of the Greenstone Alerting Service.
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| 6 | * Refer to the COPYING file in the base directory of this package
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| 7 | * for licensing information.
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| 8 | */
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| 9 | package org.greenstone.gsdlas;
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| 10 |
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[8798] | 11 | import java.sql.*;
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| 12 | import java.sql.Connection;
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| 13 | import java.sql.Statement;
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[8609] | 14 | import java.util.*;
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| 15 |
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[8717] | 16 | import javax.servlet.http.HttpSession;
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| 17 |
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[8798] | 18 | import org.greenstone.gsdlas.database.DatabaseException;
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| 19 | import org.greenstone.gsdlas.database.DatabaseManager;
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[8609] | 20 | import org.greenstone.gsdlas.profiles.*;
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| 21 |
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| 22 | /**
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| 23 | * Storage for all Profiles. Singleton.
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| 24 | *
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| 25 | * @author schweer
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| 26 | *
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| 27 | */
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| 28 | public class ProfileStore {
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| 29 |
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| 30 | private static ProfileStore instance;
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| 31 |
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[8798] | 32 | private Set noEqualsSubscriptions = new TreeSet();
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| 33 | private Map dontCareSubscriptions = new TreeMap();
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[8777] | 34 | private Map subscriptions = new TreeMap();
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[8798] | 35 |
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[8609] | 36 |
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| 37 | private ProfileStore() {
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[8798] | 38 | // TODO restore subscriptions from database
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[8609] | 39 | }
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| 40 |
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| 41 | /**
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| 42 | * @return the one existing instance of this class.
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| 43 | */
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| 44 | public static ProfileStore getInstance() {
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| 45 | if (instance == null) {
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| 46 | instance = new ProfileStore();
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| 47 | }
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| 48 | return instance;
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| 49 | }
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| 50 |
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| 51 | /**
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| 52 | * @param subscription
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| 53 | * the subscription to add to the profile store.
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| 54 | */
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[8717] | 55 | private void addSubscription(Subscription subscription) {
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[8872] | 56 | List documentIdPredicate = subscription.getPredicateList(Constants.DOCUMENT_ID_FIELD);
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| 57 | List collectionIdPredicate = subscription.getPredicateList(Constants.COLLECTION_ID_FIELD);
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| 58 | List hostIdPredicate = subscription.getPredicateList(Constants.HOST_ID_FIELD);
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| 59 | List typePredicate = subscription.getPredicateList(Constants.TYPE_FIELD);
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[8609] | 60 |
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[8777] | 61 | Integer subId = new Integer(subscription.getId());
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| 62 |
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[8798] | 63 | if (documentIdPredicate.isEmpty()) {
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[8872] | 64 | if (!dontCareSubscriptions.containsKey(Constants.DOCUMENT_ID_FIELD)) {
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| 65 | dontCareSubscriptions.put(Constants.DOCUMENT_ID_FIELD, new TreeSet());
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[8798] | 66 | }
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[8872] | 67 | Set list = (Set) dontCareSubscriptions.get(Constants.DOCUMENT_ID_FIELD);
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[8798] | 68 | list.add(subId);
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| 69 | }
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| 70 | if (collectionIdPredicate.isEmpty()) {
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[8872] | 71 | if (!dontCareSubscriptions.containsKey(Constants.COLLECTION_ID_FIELD)) {
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| 72 | dontCareSubscriptions.put(Constants.COLLECTION_ID_FIELD, new TreeSet());
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[8798] | 73 | }
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[8872] | 74 | Set list = (Set) dontCareSubscriptions.get(Constants.COLLECTION_ID_FIELD);
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[8798] | 75 | list.add(subId);
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| 76 | }
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| 77 | if (hostIdPredicate.isEmpty()) {
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[8872] | 78 | if (!dontCareSubscriptions.containsKey(Constants.HOST_ID_FIELD)) {
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| 79 | dontCareSubscriptions.put(Constants.HOST_ID_FIELD, new TreeSet());
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[8798] | 80 | }
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[8872] | 81 | Set list = (Set) dontCareSubscriptions.get(Constants.HOST_ID_FIELD);
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[8798] | 82 | list.add(subId);
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| 83 | }
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| 84 | if (typePredicate.isEmpty()) {
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[8872] | 85 | if (!dontCareSubscriptions.containsKey(Constants.TYPE_FIELD)) {
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| 86 | dontCareSubscriptions.put(Constants.TYPE_FIELD, new TreeSet());
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[8798] | 87 | }
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[8872] | 88 | Set list = (Set) dontCareSubscriptions.get(Constants.TYPE_FIELD);
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[8798] | 89 | list.add(subId);
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| 90 | }
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| 91 |
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| 92 | if (documentIdPredicate.isEmpty() && collectionIdPredicate.isEmpty()
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| 93 | && hostIdPredicate.isEmpty() && typePredicate.isEmpty()) {
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[8777] | 94 | noEqualsSubscriptions.add(subId);
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[8609] | 95 | }
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[8777] | 96 | subscriptions.put(subId, subscription);
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[8609] | 97 | }
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| 98 |
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| 99 | /**
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| 100 | * @return
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| 101 | */
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| 102 | public Set getSubscriptionsWithoutEqualsPredicates() {
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| 103 | return Collections.unmodifiableSet(noEqualsSubscriptions);
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| 104 | }
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| 105 |
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| 106 | /**
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| 107 | * Computes the list of equality subscriptions satisfied by the event.
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| 108 | * @param event
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| 109 | * @return
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| 110 | */
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| 111 | public Set getPartiallyMatchedSubscriptions(Map event) {
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| 112 | Set result = new TreeSet();
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[8777] | 113 | // TODO rework algo for getting partially matched subs
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[8780] | 114 | IdEqualsPredicate predicate;
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[8872] | 115 | predicate = PredicateFactory.getIdEqualsPredicate(Constants.TYPE_FIELD,
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| 116 | (String)event.get(Constants.TYPE_FIELD));
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[8780] | 117 | if (predicate != null)
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| 118 | result.addAll(predicate.getSubscriptionIDs());
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[8777] | 119 |
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| 120 | Set docIDSubs = new TreeSet();
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[8872] | 121 | predicate = PredicateFactory.getIdEqualsPredicate(Constants.DOCUMENT_ID_FIELD,
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| 122 | (String)event.get(Constants.DOCUMENT_ID_FIELD));
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[8780] | 123 | if (predicate != null)
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| 124 | docIDSubs.addAll(predicate.getSubscriptionIDs());
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[8872] | 125 | docIDSubs.addAll(getDontCareSubscriptions(Constants.DOCUMENT_ID_FIELD));
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[8777] | 126 | result.retainAll(docIDSubs);
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| 127 |
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| 128 | Set collIDSubs = new TreeSet();
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[8872] | 129 | predicate = PredicateFactory.getIdEqualsPredicate(Constants.COLLECTION_ID_FIELD,
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| 130 | (String)event.get(Constants.COLLECTION_ID_FIELD));
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[8780] | 131 | if (predicate != null)
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| 132 | collIDSubs.addAll(predicate.getSubscriptionIDs());
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[8872] | 133 | collIDSubs.addAll(getDontCareSubscriptions(Constants.COLLECTION_ID_FIELD));
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[8777] | 134 | result.retainAll(collIDSubs);
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| 135 |
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| 136 | Set hostIDSubs = new TreeSet();
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[8872] | 137 | predicate = PredicateFactory.getIdEqualsPredicate(Constants.HOST_ID_FIELD,
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| 138 | (String)event.get(Constants.HOST_ID_FIELD));
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[8780] | 139 | if (predicate != null)
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| 140 | hostIDSubs.addAll(predicate.getSubscriptionIDs());
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[8872] | 141 | hostIDSubs.addAll(getDontCareSubscriptions(Constants.HOST_ID_FIELD));
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[8777] | 142 | result.retainAll(hostIDSubs);
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| 143 |
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[8609] | 144 | return result;
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| 145 | }
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| 146 |
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| 147 | /**
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| 148 | *
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[8753] | 149 | * @param gsComm
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[8609] | 150 | * @return
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| 151 | * @throws UnsupportedFieldException
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| 152 | */
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| 153 | private Set findMatchedQueryPredicates(Map event, GreenstoneCommunicator gsComm) {
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| 154 | Set matchedPreds = new TreeSet();
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| 155 |
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| 156 | // iterate through all document content predicates
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| 157 | // execute the query stored in the predicate
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| 158 | // predicate is matched iff the docID occurs in the query result
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| 159 |
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[8872] | 160 | for (Iterator iter = PredicateFactory.getQueryPredicates(Constants.DOCUMENT_CONTENT_FIELD).iterator(); iter.hasNext();) {
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[8609] | 161 | Predicate predicate = (Predicate) iter.next();
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[8872] | 162 | String collection = (String) event.get(Constants.COLLECTION_ID_FIELD);
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[8609] | 163 | String query = predicate.getValue();
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| 164 | Set results;
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| 165 | try {
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| 166 | results = gsComm.fullTextSearch(collection, query);
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[8872] | 167 | if (results.contains(event.get(Constants.DOCUMENT_ID_FIELD))) {
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[8609] | 168 | matchedPreds.add(predicate);
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| 169 | }
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| 170 | } catch (Exception e) {
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| 171 | }
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| 172 | }
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| 173 |
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| 174 | return matchedPreds;
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| 175 | }
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| 176 |
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| 177 | /**
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| 178 | * Computes the set of SubstringMatchPredicates satisfied by the event.
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| 179 | * @param event
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| 180 | *
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| 181 | * @return
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| 182 | */
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| 183 | private Set findMatchedSubstringMatchPredicates(Map event) {
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| 184 | Set result = new TreeSet();
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| 185 |
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| 186 | for (Iterator iter = PredicateFactory.getAllSubstringMatchPredicates().iterator(); iter.hasNext();) {
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| 187 | Predicate predicate = (Predicate) iter.next();
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| 188 | if (predicate.isSatisfied(event)) {
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| 189 | result.add(predicate);
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| 190 | }
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| 191 | }
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| 192 | return result;
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| 193 | }
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| 194 |
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| 195 | /**
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| 196 | * Filters the event against the profiles. It uses the equality-preferred
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| 197 | * algorithm as described in Fabret, Llirbat, Pereira and Shasha:
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| 198 | * <em>Efficient Matching for Content-based Publish/Subscribe
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| 199 | * Systems</em>.
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| 200 | * @param event
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[8753] | 201 | * @param gsComm
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[8609] | 202 | */
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| 203 | public Set filter(Map event, GreenstoneCommunicator gsComm) {
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| 204 | Set matchedSubscriptions = new TreeSet();
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| 205 |
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| 206 | Set partiallyMatchedSubscriptions
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| 207 | = getPartiallyMatchedSubscriptions(event);
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| 208 |
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| 209 | Set matchedPredicates = findMatchedSubstringMatchPredicates(event);
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| 210 | matchedPredicates.addAll(findMatchedQueryPredicates(event, gsComm));
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| 211 |
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| 212 | Map numMatchedPredicates = new TreeMap();
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| 213 | for (Iterator iter = matchedPredicates.iterator(); iter.hasNext();) {
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| 214 | Predicate pred = (Predicate) iter.next();
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[8738] | 215 | for (Iterator iterator = pred.getSubscriptionIDs().iterator(); iterator
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[8609] | 216 | .hasNext();) {
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[8777] | 217 | Integer subId = (Integer) iterator.next();
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| 218 | Subscription sub = (Subscription) subscriptions.get(subId);
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| 219 | Integer count = (Integer) numMatchedPredicates.get(subId);
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[8609] | 220 | int newCountValue = (count == null ? 1 : count.intValue() + 1);
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[8777] | 221 | numMatchedPredicates.put(subId,
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[8609] | 222 | new Integer(newCountValue));
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| 223 | }
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| 224 | }
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| 225 |
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| 226 | Set notUnmatchedSubscriptions = partiallyMatchedSubscriptions;
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| 227 | notUnmatchedSubscriptions.addAll(noEqualsSubscriptions);
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| 228 | for (Iterator iter = notUnmatchedSubscriptions.iterator(); iter
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| 229 | .hasNext();) {
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[8777] | 230 | Integer subId = (Integer) iter.next();
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| 231 | Subscription sub = (Subscription) subscriptions.get(subId);
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[8609] | 232 | int matchedPredicatesCount = 0;
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[8777] | 233 | if (numMatchedPredicates.get(subId) != null) {
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| 234 | matchedPredicatesCount = ((Integer) numMatchedPredicates.get(subId)).intValue();
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[8609] | 235 | }
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| 236 | if (matchedPredicatesCount == sub.getNumOfNonEqualsPredicates()) {
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| 237 | matchedSubscriptions.add(sub);
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| 238 | }
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| 239 | }
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| 240 | return matchedSubscriptions;
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| 241 | }
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| 242 |
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[8630] | 243 |
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| 244 | /**
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[8717] | 245 | * @param arguments
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[8738] | 246 | * @throws Exception
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[8717] | 247 | */
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[8738] | 248 | public void createSubscription(Map arguments) throws Exception {
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[8717] | 249 | Subscription sub = new Subscription(arguments);
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| 250 | addSubscription(sub);
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| 251 | }
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| 252 |
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[8609] | 253 |
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[8717] | 254 | /**
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| 255 | * @param subscriptionID
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[8867] | 256 | * @throws DatabaseException
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| 257 | * @throws SQLException
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[8717] | 258 | */
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[8867] | 259 | public void deleteSubscription(String subscriptionID) throws DatabaseException, SQLException {
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| 260 | Integer subID = new Integer(subscriptionID);
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| 261 | System.out.println("deleting subscription " + subscriptionID);
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| 262 | if (!subscriptions.containsKey(subID)) {
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| 263 | return;
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| 264 | }
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| 265 | Subscription sub = (Subscription) subscriptions.get(subID);
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| 266 | for (Iterator iter = dontCareSubscriptions.values().iterator(); iter.hasNext();) {
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| 267 | Set entry = (Set) iter.next();
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| 268 | if (entry.contains(subID))
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| 269 | entry.remove(subID);
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| 270 | }
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| 271 | if (noEqualsSubscriptions.contains(subID))
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| 272 | noEqualsSubscriptions.remove(subID);
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| 273 | for (Iterator iter = sub.getPredicates().iterator(); iter.hasNext();) {
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| 274 | Predicate pred = (Predicate) iter.next();
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| 275 | pred.removeSubscription(subID);
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| 276 | }
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| 277 |
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| 278 | subscriptions.remove(subID);
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[8717] | 279 |
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[8867] | 280 |
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| 281 | Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
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| 282 |
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| 283 | Statement statement = conn.createStatement();
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| 284 |
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| 285 | String sqlString = "DELETE FROM subscriptions WHERE id = " + subscriptionID;
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| 286 | statement.executeUpdate(sqlString);
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| 287 |
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| 288 | sqlString = "SELECT predicate FROM subs_to_predicates " +
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| 289 | "WHERE subscription = " + subscriptionID;
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| 290 | ResultSet predicates = statement.executeQuery(sqlString);
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| 291 | while (predicates.next()) {
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| 292 | // if there aren't any other subscriptions using this predicate, delete predicate
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| 293 | int predicateID = predicates.getInt("predicate");
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| 294 |
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| 295 | }
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| 296 |
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| 297 |
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[8717] | 298 | }
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| 299 |
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| 300 | /**
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| 301 | * @param arguments
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| 302 | * @param session
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| 303 | */
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| 304 | public void changeSubscription(Map arguments, HttpSession session) {
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| 305 | String subscriptionID = (String) arguments.get("subscriptionID");
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| 306 | // TODO Auto-generated method stub
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| 307 |
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| 308 | }
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[8777] | 309 |
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| 310 | /**
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| 311 | * @param username
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| 312 | * @return
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[8798] | 313 | * @throws DatabaseException
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[8777] | 314 | */
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[8798] | 315 | public Set getAllSubscriptionsFor(String username) throws DatabaseException {
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[8777] | 316 | Set result = new TreeSet();
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[8798] | 317 | try {
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| 318 | Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
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| 319 | Statement statement = conn.createStatement();
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| 320 | String sqlString = "SELECT id FROM subscriptions " +
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| 321 | "WHERE user like '" + username + "';";
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| 322 | ResultSet idList = statement.executeQuery(sqlString);
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| 323 | while (idList.next()) {
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| 324 | int id = idList.getInt("id");
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| 325 | result.add(subscriptions.get(new Integer(id)));
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| 326 | }
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| 327 | } catch (SQLException e) {
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| 328 | e.printStackTrace();
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| 329 | }
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| 330 |
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[8777] | 331 | return result;
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| 332 | }
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[8798] | 333 |
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| 334 | /**
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| 335 | * @param string
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| 336 | * @return
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| 337 | */
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| 338 | private Set getDontCareSubscriptions(String field) {
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| 339 | Set result = new TreeSet();
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| 340 | if (dontCareSubscriptions.containsKey(field)) {
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| 341 | result = (Set) dontCareSubscriptions.get(field);
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| 342 | }
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| 343 | return result;
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| 344 | }
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[8867] | 345 |
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| 346 | /**
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| 347 | *
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| 348 | */
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| 349 | public void restoreFromDatabase() {
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| 350 | try {
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| 351 | Connection conn = DatabaseManager.getInstance().getDatabaseConnection();
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| 352 | Statement statement = conn.createStatement();
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| 353 | String sqlString = "SELECT * FROM subscriptions";
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| 354 | ResultSet subs = statement.executeQuery(sqlString);
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| 355 | while (subs.next()) {
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| 356 | // construct map for all predicates
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| 357 | int id = subs.getInt("id");
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| 358 | Map map = new TreeMap();
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| 359 | map.put("username", subs.getString("user"));
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| 360 | map.put("email", subs.getString("email"));
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| 361 | map.put("subscription_name", subs.getString("name"));
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| 362 | Vector ways = new Vector();
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| 363 | if (subs.getInt("rss") != 0) {
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| 364 | ways.add("rss");
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| 365 | }
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| 366 | if (subs.getInt("page") != 0) {
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| 367 | ways.add("page");
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| 368 | }
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| 369 | map.put("way", ways);
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| 370 | Statement stmnt = conn.createStatement();
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| 371 | sqlString = "SELECT p.type, p.field, p.value from subs_to_predicates stp join predicates p on(stp.predicate = p.id) where stp.subscription = " + id + ";";
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| 372 | ResultSet predicates = stmnt.executeQuery(sqlString);
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| 373 | while (predicates.next()) {
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[8872] | 374 | String type = predicates.getString(Constants.TYPE_FIELD);
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[8867] | 375 | String field = predicates.getString("field");
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| 376 | if (type.equals(SubstringMatchPredicate.class.getName())) {
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[8872] | 377 | if (field.equals(Constants.COLLECTION_ID_FIELD)) {
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| 378 | field = Constants.COLLECTION_QUERY_FIELD;
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| 379 | } else if (field.equals(Constants.HOST_ID_FIELD)) {
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| 380 | field = Constants.HOST_QUERY_FIELD;
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[8867] | 381 | }
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| 382 | }
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| 383 | String value = predicates.getString("value");
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| 384 | if (type.equals(IdEqualsPredicate.class.getName())) {
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| 385 | if (!map.containsKey(field)) {
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| 386 | map.put(field, new Vector());
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| 387 | }
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| 388 | ((List) map.get(field)).add(value);
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| 389 | } else {
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| 390 | map.put(field, value);
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| 391 | }
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| 392 | }
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| 393 | try {
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| 394 | createSubscription(map);
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| 395 | } catch (Exception e1) {
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| 396 | // TODO Auto-generated catch block
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| 397 | e1.printStackTrace();
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| 398 | }
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| 399 | }
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| 400 | } catch (SQLException e) {
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| 401 | // TODO Auto-generated catch block
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| 402 | e.printStackTrace();
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| 403 | } catch (DatabaseException e) {
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| 404 | // TODO Auto-generated catch block
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| 405 | e.printStackTrace();
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| 406 | }
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| 407 | }
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[8717] | 408 |
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[8609] | 409 | } |
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