/*******************************************************************************
* Copyright (c) 2012 The PDT Extension Group (https://github.com/pdt-eg)
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
******************************************************************************/
package org.pdtextensions.repos.internal.storage;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.runtime.preferences.ConfigurationScope;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.osgi.service.prefs.BackingStoreException;
import org.osgi.service.prefs.Preferences;
/**
* Helper class to access persistent storages
*
* @author mepeisen
*/
public class RepositoryStorage {
/** the singleton instance */
private static RepositoryStorage INSTANCE;
private int nextId;
/** the known providers */
private List<Provider> providers = new ArrayList<Provider>();
private RepositoryStorage() {
final Preferences preferences = getPrefs();
this.nextId = preferences.getInt("nextid", 0);
final String[] names = preferences.get("names", "").split(":");
for (final String id : names) {
if (id.length() == 0) {
final Preferences node = preferences.node(id);
final String type = node.get("type", null);
final String uri = node.get("uri", null);
this.providers.add(new Provider(id, type, uri));
}
}
}
/**
* Returns the singleton instance
* @return instance of the singleton
*/
public static RepositoryStorage instance() {
if (INSTANCE == null) {
INSTANCE = new RepositoryStorage();
}
return INSTANCE;
}
public String getNextId() {
this.nextId++;
final Preferences preferences = getPrefs();
preferences.putInt("nextId", this.nextId);
return "persist-repository-" + this.nextId;
}
private IEclipsePreferences getPrefs() {
return ConfigurationScope.INSTANCE.getNode("org.pdtextensions.repos");
}
public void addProvider(String id, String type, String uri) {
final Preferences preferences = getPrefs();
final Preferences node = preferences.node(id);
node.put("type", type);
node.put("uri", uri);
this.providers.add(new Provider(id, type, uri));
}
public void removeProvider(String id) {
for (final Provider provider : this.providers) {
if (provider.getId().equals(id)) {
this.providers.remove(provider);
break;
}
}
final Preferences preferences = getPrefs();
try {
preferences.node(id).removeNode();
} catch (BackingStoreException e) {
// TODO Error logging
}
}
public Iterable<Provider> providers() {
return Collections.unmodifiableList(this.providers);
}
}