| 1 | /* WRS 2.0 |
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| 2 | * Copyright (C) 2009 Anton Patrushev |
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| 3 | * |
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| 4 | * This program is free software; you can redistribute it and/or modify |
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| 5 | * it under the terms of the GNU General Public License as published by |
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| 6 | * the Free Software Foundation; either version 3 of the License, or |
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| 7 | * (at your option) any later version. |
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| 8 | * |
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| 9 | * This program is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | * GNU General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU General Public License |
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| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | */ |
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| 17 | |
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| 18 | package handler; |
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| 19 | |
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| 20 | import geometry.Point; |
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| 21 | |
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| 22 | import java.io.UnsupportedEncodingException; |
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| 23 | import java.sql.Connection; |
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| 24 | import java.sql.ResultSet; |
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| 25 | import java.sql.SQLException; |
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| 26 | import java.sql.Statement; |
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| 27 | import java.util.ArrayList; |
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| 28 | import java.util.Arrays; |
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| 29 | import java.util.HashMap; |
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| 30 | import java.util.Hashtable; |
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| 31 | import java.util.Iterator; |
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| 32 | |
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| 33 | import model.Resource; |
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| 34 | import model.Service; |
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| 35 | import util.Log; |
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| 36 | import util.ObjectPool; |
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| 37 | import util.Parameter; |
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| 38 | import util.ServiceRequest; |
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| 39 | |
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| 40 | import org.antlr.stringtemplate.StringTemplate; |
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| 41 | import org.opengis.geometry.MismatchedDimensionException; |
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| 42 | import org.opengis.referencing.FactoryException; |
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| 43 | import org.opengis.referencing.NoSuchAuthorityCodeException; |
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| 44 | import org.opengis.referencing.operation.TransformException; |
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| 45 | |
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| 46 | import com.vividsolutions.jts.io.ParseException; |
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| 47 | |
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| 48 | public class DatabaseHandler extends ResourceHandler |
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| 49 | { |
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| 50 | private Resource resource; |
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| 51 | private Hashtable<String, String> functions; |
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| 52 | |
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| 53 | public static final String SRID = "srid"; |
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| 54 | public static final String UNITS = "units"; |
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| 55 | |
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| 56 | public static final String FUNCTION = "function"; |
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| 57 | public static final String INPUT = "input"; |
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| 58 | public static final String OUTPUT = "output"; |
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| 59 | |
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| 60 | // Arrays in Services enum's elements specify an order of parameters |
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| 61 | private enum Services |
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| 62 | { |
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| 63 | ROUTE |
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| 64 | { |
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| 65 | ArrayList<String> getParameters() |
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| 66 | { |
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| 67 | String[] p = { "table", "x1", "y1", "x2", "y2", "box", |
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| 68 | "cost_value", "reverse_cost_value", "directed", "hasrc" }; |
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| 69 | return new ArrayList<String>(Arrays.asList(p)); |
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| 70 | } |
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| 71 | }, |
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| 72 | CATCH |
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| 73 | { |
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| 74 | ArrayList<String> getParameters() |
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| 75 | { |
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| 76 | String[] p = { "table", "x1", "y1", "distance", "rbox", |
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| 77 | "cost_value", "reverse_cost_value", "directed", "hasrc" }; |
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| 78 | return new ArrayList<String>(Arrays.asList(p)); |
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| 79 | } |
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| 80 | }, |
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| 81 | GEOCODE |
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| 82 | { |
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| 83 | ArrayList<String> getParameters() |
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| 84 | { |
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| 85 | String[] p = { "address" }; |
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| 86 | return new ArrayList<String>(Arrays.asList(p)); |
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| 87 | } |
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| 88 | }; |
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| 89 | |
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| 90 | abstract ArrayList<String> getParameters(); |
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| 91 | } |
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| 92 | |
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| 93 | public DatabaseHandler() |
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| 94 | { |
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| 95 | // TODO implement reading functions mapping from a config file |
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| 96 | this.functions = new Hashtable<String, String>(); |
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| 97 | this.functions.put("route", "shootingstar_sp_smart"); |
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| 98 | this.functions.put("travel", "tsp_astar_directed_smart"); |
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| 99 | this.functions.put("catch", "driving_distance"); |
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| 100 | this.functions.put("geocode", "geocode"); |
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| 101 | } |
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| 102 | |
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| 103 | @SuppressWarnings("unchecked") |
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| 104 | @Override |
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| 105 | public ArrayList<HashMap<String, Parameter>> handleRequest( |
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| 106 | ServiceRequest request, Log log) |
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| 107 | { |
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| 108 | ArrayList<HashMap<String, Parameter>> out = new ArrayList<HashMap<String, Parameter>>(); |
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| 109 | |
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| 110 | if (this.resource != null) |
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| 111 | { |
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| 112 | |
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| 113 | String query = fillQueryTemplate(this.resource.getQuery(), request |
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| 114 | .getService(), request.getParameters()); |
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| 115 | |
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| 116 | System.out.println("Query:" + query); |
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| 117 | |
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| 118 | ObjectPool<Connection> pool = this.resource.getPool(); |
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| 119 | Connection con = pool.checkOut(); |
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| 120 | |
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| 121 | if (con != null) |
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| 122 | { |
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| 123 | |
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| 124 | // TODO send query and get a result |
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| 125 | try |
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| 126 | { |
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| 127 | Statement stmt = con.createStatement(); |
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| 128 | ResultSet result = stmt.executeQuery(query); |
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| 129 | |
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| 130 | while (result.next()) |
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| 131 | { |
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| 132 | Iterator<String> keys = request.getService().getOut() |
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| 133 | .keySet().iterator(); |
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| 134 | HashMap<String, Parameter> paraMap = new HashMap<String, Parameter>(); |
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| 135 | while (keys.hasNext()) |
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| 136 | { |
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| 137 | String key = keys.next(); |
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| 138 | Parameter op = new Parameter(); |
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| 139 | op.setName(key); |
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| 140 | op.setType(request.getService().getOut().get(key) |
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| 141 | .getType()); |
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| 142 | //op.setValue(result.getString(key)); |
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| 143 | byte[] bytes = result.getBytes(key); |
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| 144 | |
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| 145 | //TODO Ugly! Ugly! Better way of handling null values is needed |
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| 146 | if(bytes != null) |
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| 147 | op.setValue(new String(result.getBytes(key), "UTF-8")); |
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| 148 | else |
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| 149 | op.setValue("0"); |
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| 150 | |
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| 151 | paraMap.put(key, op); |
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| 152 | } |
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| 153 | out.add(paraMap); |
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| 154 | } |
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| 155 | stmt.close(); |
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| 156 | } |
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| 157 | catch (SQLException e) |
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| 158 | { |
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| 159 | // TODO Auto-generated catch block |
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| 160 | e.printStackTrace(); |
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| 161 | } |
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| 162 | catch (UnsupportedEncodingException e) |
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| 163 | { |
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| 164 | // TODO Auto-generated catch block |
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| 165 | e.printStackTrace(); |
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| 166 | } |
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| 167 | |
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| 168 | pool.checkIn(con); |
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| 169 | } |
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| 170 | else |
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| 171 | { |
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| 172 | // Connection pool is full |
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| 173 | log.logger.severe("Connection to " + resource.getUrl() |
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| 174 | + " failed."); |
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| 175 | } |
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| 176 | } |
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| 177 | return out; |
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| 178 | } |
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| 179 | |
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| 180 | @Override |
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| 181 | public void setResource(Resource resource) |
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| 182 | { |
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| 183 | this.resource = resource; |
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| 184 | } |
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| 185 | |
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| 186 | @Override |
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| 187 | public String fillQueryTemplate(String template, Service service, |
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| 188 | HashMap<String, Parameter> parameters) |
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| 189 | { |
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| 190 | StringTemplate query = new StringTemplate(template); |
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| 191 | String function = this.functions.get(service.getName()); |
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| 192 | query.setAttribute(FUNCTION, function); |
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| 193 | |
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| 194 | // fill output |
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| 195 | StringBuffer output = new StringBuffer(""); |
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| 196 | Iterator<String> opit = service.getOut().keySet().iterator(); |
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| 197 | while (opit.hasNext()) |
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| 198 | { |
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| 199 | try |
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| 200 | { |
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| 201 | String key = opit.next(); |
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| 202 | Parameter p = this.resource.getParameters().get(key); |
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| 203 | output.append(p.getKey()).append(" as ").append(p.getName()); |
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| 204 | if (opit.hasNext()) |
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| 205 | output.append(","); |
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| 206 | } |
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| 207 | catch (NullPointerException e) |
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| 208 | { |
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| 209 | // Required parameter is missing! |
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| 210 | // TODO do something smart here |
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| 211 | } |
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| 212 | } |
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| 213 | query.setAttribute(OUTPUT, output.toString()); |
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| 214 | |
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| 215 | StringBuffer params = new StringBuffer(""); |
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| 216 | |
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| 217 | // fill parameters |
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| 218 | // Iterator<String> keys = service.getIn().keySet().iterator(); |
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| 219 | Iterator<String> keys = Services.valueOf( |
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| 220 | service.getName().toUpperCase()).getParameters().iterator(); |
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| 221 | while (keys.hasNext()) |
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| 222 | { |
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| 223 | try |
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| 224 | { |
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| 225 | String key = keys.next(); |
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| 226 | |
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| 227 | Parameter p = parameters.get(key); |
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| 228 | String value = p.getValue(); |
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| 229 | |
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| 230 | // Check if we need to re-project coordinates |
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| 231 | if (p.getType().toUpperCase().equals(DataTypes.DOUBLE.name()) |
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| 232 | && key.toLowerCase().startsWith("x")) |
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| 233 | { |
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| 234 | try |
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| 235 | { |
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| 236 | String srid_in = parameters.get("srid_in").getValue(); |
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| 237 | String srid_out = resource.getParameters().get("srid").getValue(); |
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| 238 | |
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| 239 | if (srid_in != srid_out) |
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| 240 | { |
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| 241 | // try to find Y coordinate |
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| 242 | String yKey = key.toLowerCase().replaceFirst("x", |
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| 243 | "y"); |
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| 244 | Parameter yP = parameters.get(yKey); |
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| 245 | String yValue = yP.getValue(); |
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| 246 | String[] transformed = transformPoint(value, yValue, |
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| 247 | srid_in, srid_out); |
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| 248 | p.setValue(transformed[0]); |
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| 249 | yP.setValue(transformed[1]); |
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| 250 | value = transformed[0]; |
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| 251 | } |
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| 252 | } |
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| 253 | catch (NullPointerException e) |
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| 254 | { |
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| 255 | //Can't find srid_in or srid_out |
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| 256 | //Do nothing |
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| 257 | } |
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| 258 | catch (MismatchedDimensionException e) |
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| 259 | { |
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| 260 | // TODO Auto-generated catch block |
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| 261 | e.printStackTrace(); |
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| 262 | } |
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| 263 | catch (NoSuchAuthorityCodeException e) |
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| 264 | { |
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| 265 | // TODO Auto-generated catch block |
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| 266 | e.printStackTrace(); |
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| 267 | } |
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| 268 | catch (FactoryException e) |
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| 269 | { |
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| 270 | // TODO Auto-generated catch block |
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| 271 | e.printStackTrace(); |
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| 272 | } |
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| 273 | catch (ParseException e) |
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| 274 | { |
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| 275 | // TODO Auto-generated catch block |
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| 276 | e.printStackTrace(); |
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| 277 | } |
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| 278 | catch (TransformException e) |
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| 279 | { |
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| 280 | // TODO Auto-generated catch block |
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| 281 | e.printStackTrace(); |
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| 282 | } |
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| 283 | } |
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| 284 | |
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| 285 | if (p.getType().toUpperCase().equals(DataTypes.STRING.name())) |
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| 286 | { |
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| 287 | value = "'" + value + "'"; |
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| 288 | } |
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| 289 | params.append(value); |
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| 290 | |
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| 291 | if (keys.hasNext()) |
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| 292 | params.append(","); |
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| 293 | |
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| 294 | } |
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| 295 | catch (NullPointerException e) |
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| 296 | { |
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| 297 | // Required parameter is missing! |
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| 298 | // TODO do something smart here |
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| 299 | } |
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| 300 | } |
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| 301 | |
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| 302 | query.setAttribute(INPUT, params.toString()); |
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| 303 | |
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| 304 | return query.toString(); |
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| 305 | } |
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| 306 | |
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| 307 | @Override |
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| 308 | public boolean checkService(Service service) |
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| 309 | { |
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| 310 | return this.resource.getServices().containsKey(service.getName()); |
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| 311 | } |
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| 312 | |
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| 313 | @Override |
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| 314 | public ArrayList<Point> parseGeometry(String geom) |
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| 315 | { |
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| 316 | ArrayList<Point> points = new ArrayList<Point>(); |
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| 317 | String[] wkts = parseWKT(geom); |
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| 318 | |
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| 319 | for (int i = 0; i < wkts.length; i++) |
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| 320 | { |
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| 321 | String wkt2[] = wkts[i].split(","); |
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| 322 | for (int j = 0; j < wkt2.length; j++) |
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| 323 | { |
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| 324 | Point point = new Point(); |
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| 325 | point.setX(Double.parseDouble(wkt2[j].split(" ")[0])); |
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| 326 | point.setY(Double.parseDouble(wkt2[j].split(" ")[1])); |
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| 327 | points.add(point); |
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| 328 | } |
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| 329 | |
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| 330 | } |
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| 331 | return points; |
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| 332 | } |
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| 333 | |
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| 334 | /** |
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| 335 | * Parses a WKT geometry string to an array |
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| 336 | * |
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| 337 | * @param resultSet |
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| 338 | * @return |
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| 339 | * @throws SQLException |
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| 340 | */ |
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| 341 | private String[] parseWKT(String wkt) |
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| 342 | { |
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| 343 | String wkts[] = null; |
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| 344 | |
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| 345 | if (wkt.contains("MULTILINESTRING")) |
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| 346 | { |
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| 347 | wkt = wkt.split("MULTILINESTRING\\(\\(")[1].split("\\)\\)")[0]; |
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| 348 | wkts = wkt.split("\\)\\("); |
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| 349 | } |
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| 350 | else if (wkt.contains("POINT")) |
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| 351 | { |
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| 352 | wkts = wkt.split("POINT\\(")[1].split("\\)"); |
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| 353 | } |
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| 354 | else if (wkt.contains("LINESTRING")) |
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| 355 | { |
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| 356 | wkts = wkt.split("LINESTRING\\(")[1].split("\\)"); |
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| 357 | } |
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| 358 | else if (wkt.contains("POLYGON")) |
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| 359 | { |
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| 360 | wkts = wkt.split("POLYGON\\(\\(")[1].split("\\)\\)"); |
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| 361 | } |
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| 362 | |
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| 363 | return wkts; |
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| 364 | } |
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| 365 | |
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| 366 | } |
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