001 package de.deepamehta.core.util;
002
003 import de.deepamehta.core.Identifiable;
004 import de.deepamehta.core.JSONEnabled;
005 import de.deepamehta.core.Topic;
006 import de.deepamehta.core.model.TopicModel;
007
008 import org.codehaus.jettison.json.JSONArray;
009 import org.codehaus.jettison.json.JSONObject;
010
011 import java.net.URL;
012 import java.util.ArrayList;
013 import java.util.Collection;
014 import java.util.HashMap;
015 import java.util.Iterator;
016 import java.util.List;
017 import java.util.Map;
018 import java.util.logging.Logger;
019
020
021
022 public class DeepaMehtaUtils {
023
024 private static Logger logger = Logger.getLogger("de.deepamehta.core.util.DeepaMehtaUtils");
025
026 private static final String DM4_HOST_URL = System.getProperty("dm4.host.url"); // ### TODO: default value (#734)
027 static {
028 logger.info("Host setting:\ndm4.host.url=\"" + DM4_HOST_URL + "\"");
029 }
030
031
032
033 // ************
034 // *** URLs ***
035 // ************
036
037
038
039 /**
040 * Checks if an URL refers to this DeepaMehta installation.
041 * The check relies on the "dm4.host.url" system property.
042 */
043 public static boolean isDeepaMehtaURL(URL url) {
044 try {
045 return url.toString().startsWith(DM4_HOST_URL);
046 } catch (Exception e) {
047 throw new RuntimeException("Checking for DeepaMehta URL failed (url=\"" + url + "\")", e);
048 }
049 }
050
051
052
053 // *******************
054 // *** Collections ***
055 // *******************
056
057
058
059 public static List<Long> idList(Iterable<? extends Identifiable> items) {
060 List<Long> ids = new ArrayList();
061 for (Identifiable item : items) {
062 ids.add(item.getId());
063 }
064 return ids;
065 }
066
067 public static List<TopicModel> toTopicModels(Iterable<? extends Topic> topics) {
068 List<TopicModel> topicModels = new ArrayList();
069 for (Topic topic : topics) {
070 topicModels.add(topic.getModel());
071 }
072 return topicModels;
073 }
074
075 public static String topicNames(Iterable<? extends Topic> topics) {
076 StringBuilder names = new StringBuilder();
077 Iterator<? extends Topic> i = topics.iterator();
078 while (i.hasNext()) {
079 Topic topic = i.next();
080 names.append('"').append(topic.getSimpleValue()).append('"');
081 if (i.hasNext()) {
082 names.append(", ");
083 }
084 }
085 return names.toString();
086 }
087
088
089
090 // ************
091 // *** JSON ***
092 // ************
093
094
095
096 // === Generic ===
097
098 public static Map toMap(JSONObject o) {
099 return toMap(o, new HashMap());
100 }
101
102 public static Map toMap(JSONObject o, Map map) {
103 try {
104 Iterator<String> i = o.keys();
105 while (i.hasNext()) {
106 String key = i.next();
107 map.put(key, o.get(key)); // throws JSONException
108 }
109 return map;
110 } catch (Exception e) {
111 throw new RuntimeException("Converting JSONObject to Map failed", e);
112 }
113 }
114
115 // ---
116
117 public static List toList(JSONArray o) {
118 try {
119 List list = new ArrayList();
120 for (int i = 0; i < o.length(); i++) {
121 list.add(o.get(i)); // throws JSONException
122 }
123 return list;
124 } catch (Exception e) {
125 throw new RuntimeException("Converting JSONArray to List failed", e);
126 }
127 }
128
129 // ---
130
131 // ### TODO: drop this method? There is a JSONArray(Collection) constructor.
132 public static JSONArray stringsToJson(Collection<String> strings) {
133 JSONArray array = new JSONArray();
134 for (String string : strings) {
135 array.put(string);
136 }
137 return array;
138 }
139
140 // === DeepaMehta specific ===
141
142 // ### TODO: rename to toJSONArray()
143 public static JSONArray objectsToJSON(Iterable<? extends JSONEnabled> items) {
144 JSONArray array = new JSONArray();
145 for (JSONEnabled item : items) {
146 array.put(item.toJSON());
147 }
148 return array;
149 }
150 }