Example usage for java.util TreeMap headMap

Introduction

In this page you can find the example usage for java.util TreeMap headMap.

Prototype

public SortedMap<K, V> headMap(K toKey) 

Source Link

Usage

From source file:edu.mit.mobile.android.appupdater.AppUpdateChecker.java

@SuppressWarnings("unchecked")
private void triggerFromJson(JSONObject jo) throws JSONException {

    final ArrayList<String> changelog = new ArrayList<String>();

    // keep a sorted map of versionCode to the version information objects.
    // Most recent is at the top.
    final TreeMap<Integer, JSONObject> versionMap = new TreeMap<Integer, JSONObject>(new Comparator<Integer>() {
        public int compare(Integer object1, Integer object2) {
            return object2.compareTo(object1);
        };//w  w w  . j  a v a 2 s.  com
    });

    for (final Iterator<String> i = jo.keys(); i.hasNext();) {
        final String versionName = i.next();
        if (versionName.equals("package")) {
            pkgInfo = jo.getJSONObject(versionName);
            continue;
        }
        final JSONObject versionInfo = jo.getJSONObject(versionName);
        versionInfo.put("versionName", versionName);

        final int versionCode = versionInfo.getInt("versionCode");
        versionMap.put(versionCode, versionInfo);
    }
    final int latestVersionNumber = versionMap.firstKey();
    final String latestVersionName = versionMap.get(latestVersionNumber).getString("versionName");
    final Uri downloadUri = Uri.parse(pkgInfo.getString("downloadUrl"));

    if (currentAppVersion > latestVersionNumber) {
        Log.d(TAG, "We're newer than the latest published version (" + latestVersionName
                + "). Living in the future...");
        mUpdateListener.appUpdateStatus(true, latestVersionName, null, downloadUri);
        return;
    }

    if (currentAppVersion == latestVersionNumber) {
        Log.d(TAG, "We're at the latest version (" + currentAppVersion + ")");
        mUpdateListener.appUpdateStatus(true, latestVersionName, null, downloadUri);
        return;
    }

    // construct the changelog. Newest entries are at the top.
    for (final Entry<Integer, JSONObject> version : versionMap.headMap(currentAppVersion).entrySet()) {
        final JSONObject versionInfo = version.getValue();
        final JSONArray versionChangelog = versionInfo.optJSONArray("changelog");
        if (versionChangelog != null) {
            final int len = versionChangelog.length();
            for (int i = 0; i < len; i++) {
                changelog.add(versionChangelog.getString(i));
            }
        }
    }

    mUpdateListener.appUpdateStatus(false, latestVersionName, changelog, downloadUri);
}

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