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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package org.libreoffice.storage;
import java.util.HashSet;
import java.util.Set;
import org.libreoffice.storage.external.ExtsdDocumentsProvider;
import org.libreoffice.storage.external.OTGDocumentsProvider;
import org.libreoffice.storage.local.LocalDocumentsDirectoryProvider;
import org.libreoffice.storage.local.LocalDocumentsProvider;
import android.content.Context;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
/**
* Keeps the instances of the available IDocumentProviders in the system.
* Instances are maintained in a sorted list and providers have to be
* accessed from their position.
*
* The factory follows the Singleton pattern, there is only one instance of it
* in the application and it must be retrieved with
* DocumentProviderFactory.getInstance().
*/
public final class DocumentProviderFactory {
public static int EXTSD_PROVIDER_INDEX = 2;
public static int OTG_PROVIDER_INDEX = 3;
/**
* Private factory instance for the Singleton pattern.
*/
private static DocumentProviderFactory instance = null;
private IDocumentProvider[] providers;
private String[] providerNames;
private DocumentProviderFactory() {
// private to prevent external instances of the factory
}
/**
* Initializes the factory with some context. If this method is called for
* twice or more times those calls will have no effect.
*
* @param context
* Application context for the factory.
*/
public static void initialize(Context context) {
if (instance == null) {
// initialize instance
instance = new DocumentProviderFactory();
// initialize document providers list
instance.providers = new IDocumentProvider[4];
instance.providers[0] = new LocalDocumentsDirectoryProvider(0);
instance.providers[1] = new LocalDocumentsProvider(1);
instance.providers[OTG_PROVIDER_INDEX] = new OTGDocumentsProvider(OTG_PROVIDER_INDEX, context);
instance.providers[EXTSD_PROVIDER_INDEX] = new ExtsdDocumentsProvider(EXTSD_PROVIDER_INDEX, context);
// initialize document provider names list
instance.providerNames = new String[instance.providers.length];
for (int i = 0; i < instance.providers.length; i++) {
instance.providerNames[i] = context.getString(instance
.getProvider(i).getNameResource());
}
}
}
/**
* Retrieve the unique instance of the factory.
*
* @return the unique factory object or null if it is not yet initialized.
*/
public static DocumentProviderFactory getInstance() {
return instance;
}
/**
* Retrieve the provider associated to a certain id.
*
* @param id
* @return document provider with that id.
*/
public IDocumentProvider getProvider(int id) {
// as for now, id == position in providers array
return providers[id];
}
/**
* Returns a sorted list of the names of the providers. Order is meaningful
* to retrieve the actual provider object with getProvider().
*
* @return Array with the names of the available providers.
*/
public String[] getNames() {
return providerNames;
}
/**
* Returns the default provider.
*
* @return default provider.
*/
public IDocumentProvider getDefaultProvider() {
return providers[0];
}
public Set<OnSharedPreferenceChangeListener> getChangeListeners() {
Set<OnSharedPreferenceChangeListener> listeners =
new HashSet<OnSharedPreferenceChangeListener>();
for (IDocumentProvider provider : providers) {
if (provider instanceof OnSharedPreferenceChangeListener)
listeners.add((OnSharedPreferenceChangeListener) provider);
}
return listeners;
}
}
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