/* * Licensed to the Apache Software Foundation (ASF) under one 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 with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.zeppelin.helium; import com.google.gson.Gson; import com.google.gson.stream.JsonReader; import org.apache.commons.io.FileUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.File; import java.io.IOException; import java.io.StringReader; import java.net.URI; import java.util.LinkedList; import java.util.List; /** * Simple Helium registry on local filesystem */ public class HeliumLocalRegistry extends HeliumRegistry { Logger logger = LoggerFactory.getLogger(HeliumLocalRegistry.class); private final Gson gson; public HeliumLocalRegistry(String name, String uri) { super(name, uri); gson = new Gson(); } @Override public synchronized List<HeliumPackage> getAll() throws IOException { List<HeliumPackage> result = new LinkedList<>(); File file = new File(uri()); File [] files = file.listFiles(); if (files == null) { return result; } for (File f : files) { if (f.getName().startsWith(".")) { continue; } HeliumPackage pkgInfo = readPackageInfo(f); if (pkgInfo != null) { result.add(pkgInfo); } } return result; } private HeliumPackage readPackageInfo(File f) { try { JsonReader reader = new JsonReader(new StringReader(FileUtils.readFileToString(f))); reader.setLenient(true); return gson.fromJson(reader, HeliumPackage.class); } catch (IOException e) { logger.error(e.getMessage(), e); return null; } } }