X-Git-Url: http://git.nikiroo.be/?p=fanfix.git;a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2FVersionCheck.java;fp=src%2Fbe%2Fnikiroo%2Futils%2FVersionCheck.java;h=0e16c2b5291c4e0a4bb445f8263e78374c3ff7c1;hp=0000000000000000000000000000000000000000;hb=5ddc36eacad78641be59db473f9bae9bad47eb20;hpb=0cf9d0459e5e67ef3f97c57cb5acb51fb5da97d7

diff --git a/src/be/nikiroo/utils/VersionCheck.java b/src/be/nikiroo/utils/VersionCheck.java
new file mode 100644
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+++ b/src/be/nikiroo/utils/VersionCheck.java
@@ -0,0 +1,172 @@
+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)//
+		);
+	}
+}