src/main/java/org/apache/cayenne/modeler/preferences/ModelerPreferences.java

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 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cayenne.modeler.preferences;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.prefs.BackingStoreException;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.PreferenceChangeListener;
import java.util.prefs.Preferences;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ModelerPreferences class supports persistent user preferences. Preferences are saved in
 * the user home directory in "<code>$HOME/.cayenne/modeler.preferences</code>" file.
 * <p>
 * <i>This class is obsolete; its users will be migrated to use preference service. </i>
 * </p>
 */
public class ModelerPreferences implements PreferenceChangeListener {

    private static Preferences cayennePrefs;

    private static final Logger logObj = LoggerFactory.getLogger(ModelerPreferences.class);

    /** Name of the log file. */
    public static final String LOGFILE_NAME = "modeler.log";

    /** List of the last 12 opened project files. */
    public static final int LAST_PROJ_FILES_SIZE = 12;

    /** Log file */
    public static final String EDITOR_LOGFILE_ENABLED = "logfileEnabled";
    public static final String EDITOR_LOGFILE = "logfile";

    /**
     * Number of items in combobox visible without scrolling
     */
    public static final int COMBOBOX_MAX_VISIBLE_SIZE = 12;

    /**
     * Returns Cayenne preferences singleton.
     */
    public static Preferences getPreferences() {
        if (cayennePrefs == null) {
            Preference decoratedPref = new UpgradeCayennePreference(
                    new CayennePreference());
            cayennePrefs = decoratedPref.getCayennePreference();
            cayennePrefs.addPreferenceChangeListener(new ModelerPreferences());
        }
        return cayennePrefs;
    }

    public static Preferences getEditorPreferences() {
        return getPreferences().node(CayennePreference.EDITOR);
    }

    public static Preferences getLastProjFilesPref() {
        return getEditorPreferences().node(CayennePreference.LAST_PROJ_FILES);
    }

    public static List<String> getLastProjFiles() {
        Preferences filesPrefs = getLastProjFilesPref();
        ArrayList<String> arrayLastProjFiles = new ArrayList<>();
        String[] keys = null;
        try {
            keys = filesPrefs.keys();
        }

        catch (BackingStoreException e) {
            logObj.warn("Error reading preferences file.", e);
        }
        if (keys != null) {
            int len = keys.length;

            ArrayList<Integer> keysInteger = new ArrayList<>();
            for (int i = 0; i < len; i++) {
                keysInteger.add(new Integer(i));
            }
            Collections.sort(keysInteger);

            for (int i = 0; i < len; i++) {
                arrayLastProjFiles.add(filesPrefs.get(keysInteger.get(i).toString(), ""));
            }
        }
        return arrayLastProjFiles;
    }

    @Override
    public void preferenceChange(PreferenceChangeEvent evt) {
        evt.getNode().put(evt.getKey(), evt.getNewValue());
    }
}