--- /dev/null
+package be.nikiroo.utils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+/**
+ * Version checker: can check the current version of the program against a
+ * remote changelog, and list the missed updates and their description.
+ *
+ * @author niki
+ */
+public class VersionCheck {
+ private static final String base = "https://github.com/${PROJECT}/raw/master/changelog${LANG}.md";
+ private static Downloader downloader = new Downloader(null);
+
+ private Version current;
+ private List<Version> newer;
+ private Map<Version, List<String>> changes;
+
+ /**
+ * Create a new {@link VersionCheck}.
+ *
+ * @param current
+ * the current version of the program
+ * @param newer
+ * the list of available {@link Version}s newer the current one
+ * @param changes
+ * the list of changes
+ */
+ private VersionCheck(Version current, List<Version> newer,
+ Map<Version, List<String>> changes) {
+ this.current = current;
+ this.newer = newer;
+ this.changes = changes;
+ }
+
+ /**
+ * Check if there are more recent {@link Version}s of this program
+ * available.
+ *
+ * @return TRUE if there is at least one
+ */
+ public boolean isNewVersionAvailable() {
+ return !newer.isEmpty();
+ }
+
+ /**
+ * The current {@link Version} of the program.
+ *
+ * @return the current {@link Version}
+ */
+ public Version getCurrentVersion() {
+ return current;
+ }
+
+ /**
+ * The list of available {@link Version}s newer than the current one.
+ *
+ * @return the newer {@link Version}s
+ */
+ public List<Version> getNewer() {
+ return newer;
+ }
+
+ /**
+ * The list of changes for each available {@link Version} newer than the
+ * current one.
+ *
+ * @return the list of changes
+ */
+ public Map<Version, List<String>> getChanges() {
+ return changes;
+ }
+
+ /**
+ * Check if there are available {@link Version}s of this program more recent
+ * than the current one.
+ *
+ * @param githubProject
+ * the GitHub project to check on, for instance "nikiroo/fanfix"
+ * @param lang
+ * the current locale, so we can try to get the changelog in the
+ * correct language (can be NULL, will fetch the default
+ * changelog)
+ *
+ * @return a {@link VersionCheck}
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ public static VersionCheck check(String githubProject, Locale lang)
+ throws IOException {
+ Version current = Version.getCurrentVersion();
+ List<Version> newer = new ArrayList<Version>();
+ Map<Version, List<String>> changes = new HashMap<Version, List<String>>();
+
+ // Use the right project:
+ String base = VersionCheck.base.replace("${PROJECT}", githubProject);
+
+ // Prepare the URLs according to the user's language (we take here
+ // "-fr_BE" as an example):
+ String fr = lang == null ? "" : "-" + lang.getLanguage();
+ String BE = lang == null ? ""
+ : "_" + lang.getCountry().replace(".UTF8", "");
+ String urlFrBE = base.replace("${LANG}", fr + BE);
+ String urlFr = base.replace("${LANG}", "-" + fr);
+ String urlDefault = base.replace("${LANG}", "");
+
+ InputStream in = null;
+ for (String url : new String[] { urlFrBE, urlFr, urlDefault }) {
+ try {
+ in = downloader.open(new URL(url), false);
+ break;
+ } catch (IOException e) {
+ }
+ }
+
+ if (in == null) {
+ throw new IOException("No changelog found");
+ }
+
+ BufferedReader reader = new BufferedReader(
+ new InputStreamReader(in, "UTF-8"));
+ try {
+ Version version = new Version();
+ for (String line = reader.readLine(); line != null; line = reader
+ .readLine()) {
+ if (line.startsWith("## Version ")) {
+ version = new Version(
+ line.substring("## Version ".length()));
+ if (version.isNewerThan(current)) {
+ newer.add(version);
+ changes.put(version, new ArrayList<String>());
+ } else {
+ version = new Version();
+ }
+ } else if (!version.isEmpty() && !newer.isEmpty()
+ && !line.isEmpty()) {
+ List<String> ch = changes.get(newer.get(newer.size() - 1));
+ if (!ch.isEmpty() && !line.startsWith("- ")) {
+ int i = ch.size() - 1;
+ ch.set(i, ch.get(i) + " " + line.trim());
+ } else {
+ ch.add(line.substring("- ".length()).trim());
+ }
+ }
+ }
+ } finally {
+ reader.close();
+ }
+
+ return new VersionCheck(current, newer, changes);
+ }
+
+ @Override
+ public String toString() {
+ return String.format(
+ "Version checker: version [%s], %d releases behind latest version [%s]", //
+ current, //
+ newer.size(), //
+ newer.isEmpty() ? current : newer.get(newer.size() - 1)//
+ );
+ }
+}
git://git.nikiroo.be / fanfix.git / blobdiff