22870977169

Committed 09 Mar 2026 07:28PM UTC coverage: 27.117% (+1.6%) from 25.557%

Build # 22870977169

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push

github

Committed by

web-flow

Commit Message

Merge pull request #75 from knowledgepixels/74-peer-registry-sync

feat: add registry-to-registry peer sync for CHECK_NEW

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166 of 676 branches covered (24.56%)

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87.95

src/main/java/com/knowledgepixels/registry/Utils.java

package com.knowledgepixels.registry;

import com.github.jsonldjava.shaded.com.google.common.base.Charsets;
import com.github.jsonldjava.shaded.com.google.common.reflect.TypeToken;
import com.google.common.hash.Hashing;
import com.google.gson.Gson;
import com.google.gson.JsonIOException;
import com.google.gson.JsonSyntaxException;
import com.mongodb.client.ClientSession;
import io.vertx.ext.web.RoutingContext;
import net.trustyuri.TrustyUriUtils;
import org.apache.commons.lang.StringUtils;
import org.commonjava.mimeparse.MIMEParse;
import org.eclipse.rdf4j.common.exception.RDF4JException;
import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.util.Values;
import org.nanopub.MalformedNanopubException;
import org.nanopub.Nanopub;
import org.nanopub.NanopubImpl;
import org.nanopub.NanopubUtils;
import org.nanopub.extra.setting.NanopubSetting;
import org.nanopub.vocabulary.NPX;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.*;

/**
 * Utility class for the Nanopub Registry.
 */
public class Utils {

    private static final Logger logger = LoggerFactory.getLogger(Utils.class);

    private Utils() {
    }  // no instances allowed

    public static String getMimeType(RoutingContext context, String supported) {
        List<String> supportedList = Arrays.asList(StringUtils.split(supported, ','));
        String mimeType = supportedList.getFirst();
        String acceptHeader = context.request().getHeader("Accept");
        if (acceptHeader == null) return mimeType;
        try {
            mimeType = MIMEParse.bestMatch(supportedList, acceptHeader);
        } catch (Exception ex) {
            logger.error("Error parsing Accept header.", ex);
        }
        return mimeType;
    }

    public static String urlEncode(Object o) {
        return URLEncoder.encode((o == null ? "" : o.toString()), StandardCharsets.UTF_8);
    }

    public static String getHash(String s) {
        return Hashing.sha256().hashString(s, Charsets.UTF_8).toString();
    }

    /**
     * Get the IDs of nanopublications invalidated by the given nanopublication.
     *
     * @param np the nanopublication to check
     * @return a set of IRI IDs of invalidated nanopublications
     */
    public static Set<IRI> getInvalidatedNanopubIds(Nanopub np) {
        Set<IRI> invalidatedNanopubs = new HashSet<>();
        for (Statement st : NanopubUtils.getStatements(np)) {
            if (!(st.getObject() instanceof IRI)) continue;
            Resource subject = st.getSubject();
            IRI predicate = st.getPredicate();
            if ((predicate.equals(NPX.RETRACTS) || predicate.equals(NPX.INVALIDATES)) || (predicate.equals(NPX.SUPERSEDES) && subject.equals(np.getUri()))) {
                if (TrustyUriUtils.isPotentialTrustyUri(st.getObject().stringValue())) {
                    invalidatedNanopubs.add((IRI) st.getObject());
                }
            }
        }
        return invalidatedNanopubs;
    }

    private static ReadsEnvironment ENV_READER = new ReadsEnvironment(System::getenv);

    /**
     * Set the environment reader (used for testing purposes).
     *
     * @param reader the environment reader to set
     */
    public static void setEnvReader(ReadsEnvironment reader) {
        ENV_READER = reader;
    }

    /**
     * Get an environment variable, returning a default value if not set.
     *
     * @param name         the name of the environment variable
     * @param defaultValue the default value to return if the variable is not set
     * @return the value of the environment variable, or the default value if not set
     */
    public static String getEnv(String name, String defaultValue) {
        logger.info("Retrieving environment variable: {}", name);
        String value = ENV_READER.getEnv(name);
        if (value == null) {
            value = defaultValue;
            logger.info("The variable: {} is not set. Using default value: {}", name, defaultValue);
        }
        return value;
    }

    /**
     * Get the type hash for a given type, recording it in the database if necessary.
     *
     * @param mongoSession the MongoDB client session
     * @param type         the type to get the hash for
     * @return the type hash
     */
    public static String getTypeHash(ClientSession mongoSession, Object type) {
        String typeHash = Utils.getHash(type.toString());
        if (type.toString().equals("$")) {
            typeHash = "$";
        } else {
            RegistryDB.recordHash(mongoSession, type.toString());
        }
        return typeHash;
    }

    /**
     * Get a label for an agent ID, truncating if necessary.
     *
     * @param agentId the agent ID
     * @return the agent label
     */
    public static String getAgentLabel(String agentId) {
        if (agentId == null || agentId.isBlank()) {
            throw new IllegalArgumentException("Agent ID cannot be null or blank");
        }
        agentId = agentId.replaceFirst("^https://orcid\\.org/", "orcid:");
        if (agentId.length() > 55) {
            return agentId.substring(0, 50) + "...";
        }
        return agentId;
    }

    /**
     * Check if the given status indicates an unloaded entry.
     *
     * @param status the status to check
     * @return true if the status indicates an unloaded entry, false otherwise
     */
    public static boolean isUnloadedStatus(String status) {
        if (status.equals(EntryStatus.seen.getValue())) return true;  // only exists in "accounts_loading"?
        return status.equals(EntryStatus.skipped.getValue());
    }

    /**
     * Check if the given status indicates a core loaded entry.
     *
     * @param status the status to check
     * @return true if the status indicates a core loaded entry, false otherwise
     */
    public static boolean isCoreLoadedStatus(String status) {
        if (status.equals(EntryStatus.visited.getValue())) return true;  // only exists in "accounts_loading"?
        if (status.equals(EntryStatus.expanded.getValue())) return true;  // only exists in "accounts_loading"?
        if (status.equals(EntryStatus.processed.getValue())) return true;  // only exists in "accounts_loading"?
        if (status.equals(EntryStatus.aggregated.getValue())) return true;  // only exists in "accounts_loading"?
        if (status.equals(EntryStatus.approved.getValue())) return true;  // only exists in "accounts_loading"?
        if (status.equals(EntryStatus.contested.getValue())) return true;
        if (status.equals(EntryStatus.toLoad.getValue())) return true;  // only exists in "accounts_loading"?
        return status.equals(EntryStatus.loaded.getValue());
    }

    /**
     * Check if the given status indicates a fully loaded entry.
     *
     * @param status the status to check
     * @return true if the status indicates a fully loaded entry, false otherwise
     */
    public static boolean isFullyLoadedStatus(String status) {
        return status.equals(EntryStatus.loaded.getValue());
    }

    public static final IRI APPROVES_OF = Values.iri("http://purl.org/nanopub/x/approvesOf");

    public static final String TYPE_JSON = "application/json";
    public static final String TYPE_TRIG = "application/trig";
    public static final String TYPE_JELLY = "application/x-jelly-rdf";
    public static final String TYPE_JSONLD = "application/ld+json";
    public static final String TYPE_NQUADS = "application/n-quads";
    public static final String TYPE_TRIX = "application/trix";
    public static final String TYPE_HTML = "text/html";

    // Content types supported on a ListPage
    public static final String SUPPORTED_TYPES_LIST = TYPE_JSON + "," + TYPE_JELLY + "," + TYPE_HTML;
    // Content types supported on a NanopubPage
    public static final String SUPPORTED_TYPES_NANOPUB = TYPE_TRIG + "," + TYPE_JELLY + "," + TYPE_JSONLD + "," + TYPE_NQUADS + "," + TYPE_TRIX + "," + TYPE_HTML;

    private static Map<String, String> extensionTypeMap;

    /**
     * Get the type corresponding to a given file extension.
     *
     * @param extension the file extension
     * @return the corresponding MIME type, or null if not found
     */
    public static String getType(String extension) {
        if (extension == null) {
            return null;
        }
        if (extensionTypeMap == null) {
            extensionTypeMap = new HashMap<>();
            extensionTypeMap.put("trig", TYPE_TRIG);
            extensionTypeMap.put("jelly", TYPE_JELLY);
            extensionTypeMap.put("jsonld", TYPE_JSONLD);
            extensionTypeMap.put("nq", TYPE_NQUADS);
            extensionTypeMap.put("xml", TYPE_TRIX);
            extensionTypeMap.put("html", TYPE_HTML);
            extensionTypeMap.put("json", TYPE_JSON);
        }
        return extensionTypeMap.get(extension);
    }

    private static List<String> peerUrls;

    /**
     * Get the list of peer registry URLs.
     *
     * @return the list of peer registry URLs
     */
    public static List<String> getPeerUrls() {
        if (peerUrls == null) {
            peerUrls = new ArrayList<>();
            String envPeerUrls = getEnv("REGISTRY_PEER_URLS", "");
            String thisRegistryUrl = getEnv("REGISTRY_SERVICE_URL", "");
            if (!envPeerUrls.isEmpty()) {
                for (String peerUrl : envPeerUrls.split(";")) {
                    if (thisRegistryUrl.equals(peerUrl)) {
                        continue;
                    }
                    peerUrls.add(peerUrl);
                }
            } else {
                NanopubSetting setting;
                try {
                    setting = getSetting();
                } catch (MalformedNanopubException | IOException ex) {
                    logger.error("Error loading registry setting: {}", ex.getMessage());
                    throw new RuntimeException(ex);
                }
                for (IRI iri : setting.getBootstrapServices()) {
                    String peerUrl = iri.stringValue();
                    if (thisRegistryUrl.equals(peerUrl)) {
                        continue;
                    }
                    peerUrls.add(peerUrl);
                }
            }
        }
        return peerUrls;
    }

    private static volatile NanopubSetting settingNp;

    /**
     * Get the nanopublication setting.
     *
     * @return the nanopublication setting
     * @throws RDF4JException            if there is an error retrieving the setting
     * @throws MalformedNanopubException if the setting nanopublication is malformed
     * @throws IOException               if there is an I/O error
     */
    public static NanopubSetting getSetting() throws RDF4JException, MalformedNanopubException, IOException {
        if (settingNp == null) {
            synchronized (Utils.class) {
                if (settingNp == null) {
                    String settingPath = getEnv("REGISTRY_SETTING_FILE", "/data/setting.trig");
                    settingNp = new NanopubSetting(new NanopubImpl(new File(settingPath)));
                }
            }
        }
        return settingNp;
    }

    /**
     * Get a random peer registry URL.
     *
     * @return a random peer registry URL
     * @throws RDF4JException if there is an error retrieving the peer URLs
     */
    public static String getRandomPeer() throws RDF4JException {
        List<String> peerUrls = getPeerUrls();
        return peerUrls.get(random.nextInt(peerUrls.size()));
    }

    private static final Random random = new Random();

    /**
     * Get the random number generator.
     *
     * @return the random number generator
     */
    public static Random getRandom() {
        return random;
    }

    private static final Gson g = new Gson();
    private static Type listType = new TypeToken<List<String>>() {
    }.getType();

    /**
     * Retrieve a list of strings from a JSON URL.
     *
     * @param url the URL to retrieve the JSON from
     * @return the list of strings
     * @throws JsonIOException     if there is an error reading the JSON
     * @throws JsonSyntaxException if the JSON syntax is invalid
     * @throws IOException         if there is an I/O error
     * @throws URISyntaxException  if the URL syntax is invalid
     */
    public static List<String> retrieveListFromJsonUrl(String url) throws JsonIOException, JsonSyntaxException, IOException, URISyntaxException {
        return g.fromJson(new InputStreamReader(new URI(url).toURL().openStream()), listType);
    }

}

1	package com.knowledgepixels.registry;
2
3	import com.github.jsonldjava.shaded.com.google.common.base.Charsets;
4	import com.github.jsonldjava.shaded.com.google.common.reflect.TypeToken;
5	import com.google.common.hash.Hashing;
6	import com.google.gson.Gson;
7	import com.google.gson.JsonIOException;
8	import com.google.gson.JsonSyntaxException;
9	import com.mongodb.client.ClientSession;
10	import io.vertx.ext.web.RoutingContext;
11	import net.trustyuri.TrustyUriUtils;
12	import org.apache.commons.lang.StringUtils;
13	import org.commonjava.mimeparse.MIMEParse;
14	import org.eclipse.rdf4j.common.exception.RDF4JException;
15	import org.eclipse.rdf4j.model.IRI;
16	import org.eclipse.rdf4j.model.Resource;
17	import org.eclipse.rdf4j.model.Statement;
18	import org.eclipse.rdf4j.model.util.Values;
19	import org.nanopub.MalformedNanopubException;
20	import org.nanopub.Nanopub;
21	import org.nanopub.NanopubImpl;
22	import org.nanopub.NanopubUtils;
23	import org.nanopub.extra.setting.NanopubSetting;
24	import org.nanopub.vocabulary.NPX;
25	import org.slf4j.Logger;
26	import org.slf4j.LoggerFactory;
27
28	import java.io.File;
29	import java.io.IOException;
30	import java.io.InputStreamReader;
31	import java.lang.reflect.Type;
32	import java.net.URI;
33	import java.net.URISyntaxException;
34	import java.net.URLEncoder;
35	import java.nio.charset.StandardCharsets;
36	import java.util.*;
37
38	/**
39	* Utility class for the Nanopub Registry.
40	*/
41	public class Utils {
42
43	private static final Logger logger = LoggerFactory.getLogger(Utils.class);	9✔
44
45	private Utils() {
46	} // no instances allowed
47
48	public static String getMimeType(RoutingContext context, String supported) {
49	List<String> supportedList = Arrays.asList(StringUtils.split(supported, ','));	×
50	String mimeType = supportedList.getFirst();	×
51	String acceptHeader = context.request().getHeader("Accept");	×
52	if (acceptHeader == null) return mimeType;	×
53	try {
54	mimeType = MIMEParse.bestMatch(supportedList, acceptHeader);	×
55	} catch (Exception ex) {	×
56	logger.error("Error parsing Accept header.", ex);	×
57	}	×
58	return mimeType;	×
59	}
60
61	public static String urlEncode(Object o) {
62	return URLEncoder.encode((o == null ? "" : o.toString()), StandardCharsets.UTF_8);	27✔
63	}
64
65	public static String getHash(String s) {
66	return Hashing.sha256().hashString(s, Charsets.UTF_8).toString();	18✔
67	}
68
69	/**
70	* Get the IDs of nanopublications invalidated by the given nanopublication.
71	*
72	* @param np the nanopublication to check
73	* @return a set of IRI IDs of invalidated nanopublications
74	*/
75	public static Set<IRI> getInvalidatedNanopubIds(Nanopub np) {
76	Set<IRI> invalidatedNanopubs = new HashSet<>();	12✔
77	for (Statement st : NanopubUtils.getStatements(np)) {	33✔
78	if (!(st.getObject() instanceof IRI)) continue;	15✔
79	Resource subject = st.getSubject();	9✔
80	IRI predicate = st.getPredicate();	9✔
81	if ((predicate.equals(NPX.RETRACTS) \|\| predicate.equals(NPX.INVALIDATES)) \|\| (predicate.equals(NPX.SUPERSEDES) && subject.equals(np.getUri()))) {	51!
82	if (TrustyUriUtils.isPotentialTrustyUri(st.getObject().stringValue())) {	15!
83	invalidatedNanopubs.add((IRI) st.getObject());	18✔
84	}
85	}
86	}	3✔
87	return invalidatedNanopubs;	6✔
88	}
89
90	private static ReadsEnvironment ENV_READER = new ReadsEnvironment(System::getenv);	15✔
91
92	/**
93	* Set the environment reader (used for testing purposes).
94	*
95	* @param reader the environment reader to set
96	*/
97	public static void setEnvReader(ReadsEnvironment reader) {
98	ENV_READER = reader;	6✔
99	}	3✔
100
101	/**
102	* Get an environment variable, returning a default value if not set.
103	*
104	* @param name the name of the environment variable
105	* @param defaultValue the default value to return if the variable is not set
106	* @return the value of the environment variable, or the default value if not set
107	*/
108	public static String getEnv(String name, String defaultValue) {
109	logger.info("Retrieving environment variable: {}", name);	12✔
110	String value = ENV_READER.getEnv(name);	12✔
111	if (value == null) {	6✔
112	value = defaultValue;	6✔
113	logger.info("The variable: {} is not set. Using default value: {}", name, defaultValue);	15✔
114	}
115	return value;	6✔
116	}
117
118	/**
119	* Get the type hash for a given type, recording it in the database if necessary.
120	*
121	* @param mongoSession the MongoDB client session
122	* @param type the type to get the hash for
123	* @return the type hash
124	*/
125	public static String getTypeHash(ClientSession mongoSession, Object type) {
126	String typeHash = Utils.getHash(type.toString());	12✔
127	if (type.toString().equals("$")) {	15✔
128	typeHash = "$";	9✔
129	} else {
130	RegistryDB.recordHash(mongoSession, type.toString());	12✔
131	}
132	return typeHash;	6✔
133	}
134
135	/**
136	* Get a label for an agent ID, truncating if necessary.
137	*
138	* @param agentId the agent ID
139	* @return the agent label
140	*/
141	public static String getAgentLabel(String agentId) {
142	if (agentId == null \|\| agentId.isBlank()) {	15✔
143	throw new IllegalArgumentException("Agent ID cannot be null or blank");	15✔
144	}
145	agentId = agentId.replaceFirst("^https://orcid\\.org/", "orcid:");	15✔
146	if (agentId.length() > 55) {	12✔
147	return agentId.substring(0, 50) + "...";	18✔
148	}
149	return agentId;	6✔
150	}
151
152	/**
153	* Check if the given status indicates an unloaded entry.
154	*
155	* @param status the status to check
156	* @return true if the status indicates an unloaded entry, false otherwise
157	*/
158	public static boolean isUnloadedStatus(String status) {
159	if (status.equals(EntryStatus.seen.getValue())) return true; // only exists in "accounts_loading"?	21✔
160	return status.equals(EntryStatus.skipped.getValue());	15✔
161	}
162
163	/**
164	* Check if the given status indicates a core loaded entry.
165	*
166	* @param status the status to check
167	* @return true if the status indicates a core loaded entry, false otherwise
168	*/
169	public static boolean isCoreLoadedStatus(String status) {
170	if (status.equals(EntryStatus.visited.getValue())) return true; // only exists in "accounts_loading"?	21✔
171	if (status.equals(EntryStatus.expanded.getValue())) return true; // only exists in "accounts_loading"?	21✔
172	if (status.equals(EntryStatus.processed.getValue())) return true; // only exists in "accounts_loading"?	21✔
173	if (status.equals(EntryStatus.aggregated.getValue())) return true; // only exists in "accounts_loading"?	21✔
174	if (status.equals(EntryStatus.approved.getValue())) return true; // only exists in "accounts_loading"?	21✔
175	if (status.equals(EntryStatus.contested.getValue())) return true;	21✔
176	if (status.equals(EntryStatus.toLoad.getValue())) return true; // only exists in "accounts_loading"?	21✔
177	return status.equals(EntryStatus.loaded.getValue());	15✔
178	}
179
180	/**
181	* Check if the given status indicates a fully loaded entry.
182	*
183	* @param status the status to check
184	* @return true if the status indicates a fully loaded entry, false otherwise
185	*/
186	public static boolean isFullyLoadedStatus(String status) {
187	return status.equals(EntryStatus.loaded.getValue());	15✔
188	}
189
190	public static final IRI APPROVES_OF = Values.iri("http://purl.org/nanopub/x/approvesOf");	9✔
191
192	public static final String TYPE_JSON = "application/json";
193	public static final String TYPE_TRIG = "application/trig";
194	public static final String TYPE_JELLY = "application/x-jelly-rdf";
195	public static final String TYPE_JSONLD = "application/ld+json";
196	public static final String TYPE_NQUADS = "application/n-quads";
197	public static final String TYPE_TRIX = "application/trix";
198	public static final String TYPE_HTML = "text/html";
199
200	// Content types supported on a ListPage
201	public static final String SUPPORTED_TYPES_LIST = TYPE_JSON + "," + TYPE_JELLY + "," + TYPE_HTML;
202	// Content types supported on a NanopubPage
203	public static final String SUPPORTED_TYPES_NANOPUB = TYPE_TRIG + "," + TYPE_JELLY + "," + TYPE_JSONLD + "," + TYPE_NQUADS + "," + TYPE_TRIX + "," + TYPE_HTML;
204
205	private static Map<String, String> extensionTypeMap;
206
207	/**
208	* Get the type corresponding to a given file extension.
209	*
210	* @param extension the file extension
211	* @return the corresponding MIME type, or null if not found
212	*/
213	public static String getType(String extension) {
214	if (extension == null) {	6✔
215	return null;	6✔
216	}
217	if (extensionTypeMap == null) {	6✔
218	extensionTypeMap = new HashMap<>();	12✔
219	extensionTypeMap.put("trig", TYPE_TRIG);	15✔
220	extensionTypeMap.put("jelly", TYPE_JELLY);	15✔
221	extensionTypeMap.put("jsonld", TYPE_JSONLD);	15✔
222	extensionTypeMap.put("nq", TYPE_NQUADS);	15✔
223	extensionTypeMap.put("xml", TYPE_TRIX);	15✔
224	extensionTypeMap.put("html", TYPE_HTML);	15✔
225	extensionTypeMap.put("json", TYPE_JSON);	15✔
226	}
227	return extensionTypeMap.get(extension);	15✔
228	}
229
230	private static List<String> peerUrls;
231
232	/**
233	* Get the list of peer registry URLs.
234	*
235	* @return the list of peer registry URLs
236	*/
237	public static List<String> getPeerUrls() {
238	if (peerUrls == null) {	6✔
239	peerUrls = new ArrayList<>();	12✔
240	String envPeerUrls = getEnv("REGISTRY_PEER_URLS", "");	12✔
241	String thisRegistryUrl = getEnv("REGISTRY_SERVICE_URL", "");	12✔
242	if (!envPeerUrls.isEmpty()) {	9✔
243	for (String peerUrl : envPeerUrls.split(";")) {	57✔
244	if (thisRegistryUrl.equals(peerUrl)) {	12!
245	continue;	×
246	}
247	peerUrls.add(peerUrl);	12✔
248	}
249	} else {
250	NanopubSetting setting;
251	try {
252	setting = getSetting();	6✔
253	} catch (MalformedNanopubException \| IOException ex) {	3✔
254	logger.error("Error loading registry setting: {}", ex.getMessage());	15✔
255	throw new RuntimeException(ex);	15✔
256	}	3✔
257	for (IRI iri : setting.getBootstrapServices()) {	33✔
258	String peerUrl = iri.stringValue();	9✔
259	if (thisRegistryUrl.equals(peerUrl)) {	12!
260	continue;	×
261	}
262	peerUrls.add(peerUrl);	12✔
263	}	3✔
264	}
265	}
266	return peerUrls;	6✔
267	}
268
269	private static volatile NanopubSetting settingNp;
270
271	/**
272	* Get the nanopublication setting.
273	*
274	* @return the nanopublication setting
275	* @throws RDF4JException if there is an error retrieving the setting
276	* @throws MalformedNanopubException if the setting nanopublication is malformed
277	* @throws IOException if there is an I/O error
278	*/
279	public static NanopubSetting getSetting() throws RDF4JException, MalformedNanopubException, IOException {
280	if (settingNp == null) {	6✔
281	synchronized (Utils.class) {	12✔
282	if (settingNp == null) {	6!
283	String settingPath = getEnv("REGISTRY_SETTING_FILE", "/data/setting.trig");	12✔
284	settingNp = new NanopubSetting(new NanopubImpl(new File(settingPath)));	33✔
285	}
286	}	9✔
287	}
288	return settingNp;	6✔
289	}
290
291	/**
292	* Get a random peer registry URL.
293	*
294	* @return a random peer registry URL
295	* @throws RDF4JException if there is an error retrieving the peer URLs
296	*/
297	public static String getRandomPeer() throws RDF4JException {
298	List<String> peerUrls = getPeerUrls();	6✔
299	return peerUrls.get(random.nextInt(peerUrls.size()));	24✔
300	}
301
302	private static final Random random = new Random();	12✔
303
304	/**
305	* Get the random number generator.
306	*
307	* @return the random number generator
308	*/
309	public static Random getRandom() {
310	return random;	6✔
311	}
312
313	private static final Gson g = new Gson();	12✔
314	private static Type listType = new TypeToken<List<String>>() {	21✔
315	}.getType();	6✔
316
317	/**
318	* Retrieve a list of strings from a JSON URL.
319	*
320	* @param url the URL to retrieve the JSON from
321	* @return the list of strings
322	* @throws JsonIOException if there is an error reading the JSON
323	* @throws JsonSyntaxException if the JSON syntax is invalid
324	* @throws IOException if there is an I/O error
325	* @throws URISyntaxException if the URL syntax is invalid
326	*/
327	public static List<String> retrieveListFromJsonUrl(String url) throws JsonIOException, JsonSyntaxException, IOException, URISyntaxException {
328	return g.fromJson(new InputStreamReader(new URI(url).toURL().openStream()), listType);	×
329	}
330
331	}

knowledgepixels / nanopub-registry / 22870977169

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