org.rstudio.studio.client.application.IgnoredUpdates.java Source code

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Here is the source code for org.rstudio.studio.client.application.IgnoredUpdates.java

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/*
 * IgnoredUpdates.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.studio.client.application;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArrayString;

public class IgnoredUpdates extends JavaScriptObject {
    protected IgnoredUpdates() {
    }

    public static final native IgnoredUpdates create() /*-{
                                                       return { updates: [] };
                                                       }-*/;

    public final native JsArrayString getIgnoredUpdates() /*-{
                                                          return this.updates;
                                                          }-*/;

    public final native void setIgnoredUpdates(JsArrayString updates) /*-{
                                                                      this.updates = updates;
                                                                      }-*/;

    public final void addIgnoredUpdate(String update) {
        JsArrayString newUpdateList = create().getIgnoredUpdates();
        JsArrayString existingUpdateList = getIgnoredUpdates();

        for (int i = 0; i < existingUpdateList.length(); i++) {
            // We want to discard any updates we're ignoring that are older than
            // the one we're ignoring now--i.e. if we're currently ignoring 
            // { 0.98.407, 0.99.440 }, and we were just asked to ignore 
            // 0.98.411, the new set should be { 0.98.411, 0.99.440 }. Do this by
            // only keeping updates in the list that are newer than the update 
            // we're about to add.
            if (compareVersions(update, existingUpdateList.get(i)) < 0) {
                newUpdateList.push(existingUpdateList.get(i));
            }
        }
        newUpdateList.push(update);
        setIgnoredUpdates(newUpdateList);
    }

    // Returns:
    // < 0 if version1 is earlier than version 2
    // 0 if version1 and version2 are the same 
    // > 0 if version1 is later than version 2
    private final int compareVersions(String version1, String version2) {
        String[] v1parts = version1.split(".");
        String[] v2parts = version2.split(".");
        int numParts = Math.min(v1parts.length, v2parts.length);
        for (int i = 0; i < numParts; i++) {
            int result = Integer.parseInt(v1parts[i]) - Integer.parseInt(v2parts[i]);
            if (result != 0)
                return result;
        }
        return 0;
    }
}