/** * 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.metamodel.membrane.app.registry.file; import java.io.File; import java.io.FileFilter; import java.io.IOException; import java.io.UncheckedIOException; import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; import org.apache.metamodel.DataContext; import org.apache.metamodel.factory.DataContextProperties; import org.apache.metamodel.membrane.app.config.JacksonConfig; import org.apache.metamodel.membrane.app.exceptions.DataSourceAlreadyExistException; import org.apache.metamodel.membrane.app.exceptions.NoSuchDataSourceException; import org.apache.metamodel.membrane.app.registry.AbstractDataSourceRegistry; import org.apache.metamodel.membrane.app.registry.DataContextSupplier; import org.apache.metamodel.membrane.app.registry.TenantContext; import org.apache.metamodel.membrane.controllers.model.RestDataSourceDefinition; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.common.base.Strings; public class FileBasedDataSourceRegistry extends AbstractDataSourceRegistry { private static final ObjectMapper OBJECT_MAPPER = JacksonConfig.getObjectMapper(); private static final String DATASOURCE_FILE_SUFFIX = ".json"; private static final String DATASOURCE_FILE_PREFIX = "ds_"; private final File directory; public FileBasedDataSourceRegistry(TenantContext tenantContext, File directory) { super(tenantContext); this.directory = directory; } @Override public List<String> getDataSourceNames() { final File[] files = directory.listFiles(new FileFilter() { @Override public boolean accept(File file) { if (file.isDirectory()) { final String filename = file.getName(); if (filename.startsWith(DATASOURCE_FILE_PREFIX) && filename.endsWith(DATASOURCE_FILE_SUFFIX)) { return true; } } return false; } }); return Arrays.stream(files).map(f -> getDataSourceName(f)).collect(Collectors.toList()); } private String getDataSourceName(File file) { final String filename = file.getName(); return filename.substring(DATASOURCE_FILE_PREFIX.length(), filename.length() - DATASOURCE_FILE_SUFFIX.length()); } private File getDataSourceFile(String name) { final String filename = DATASOURCE_FILE_PREFIX + name + DATASOURCE_FILE_SUFFIX; return new File(directory, filename); } @Override public String registerDataSource(String dataSourceName, DataContextProperties dataContextProperties) throws DataSourceAlreadyExistException { if (Strings.isNullOrEmpty(dataSourceName)) { throw new IllegalArgumentException("DataSource name cannot be null or empty"); } final File file = getDataSourceFile(dataSourceName); if (file.exists()) { throw new DataSourceAlreadyExistException(dataSourceName); } final RestDataSourceDefinition dataSource = new RestDataSourceDefinition(dataContextProperties); try { OBJECT_MAPPER.writeValue(file, dataSource); } catch (IOException e) { throw new UncheckedIOException(e); } return dataSourceName; } @Override public DataContext openDataContext(String dataSourceName) throws NoSuchDataSourceException { if (Strings.isNullOrEmpty(dataSourceName)) { throw new IllegalArgumentException("DataSource name cannot be null or empty"); } final File file = getDataSourceFile(dataSourceName); if (!file.exists()) { throw new NoSuchDataSourceException(dataSourceName); } final RestDataSourceDefinition dataSource; try { dataSource = OBJECT_MAPPER.readValue(file, RestDataSourceDefinition.class); } catch (IOException e) { throw new UncheckedIOException(e); } final DataContextSupplier supplier = createDataContextSupplier(dataSourceName, dataSource.toDataContextProperties()); return supplier.get(); } @Override public void removeDataSource(String dataSourceName) throws NoSuchDataSourceException { if (Strings.isNullOrEmpty(dataSourceName)) { throw new IllegalArgumentException("DataSource name cannot be null or empty"); } final File file = getDataSourceFile(dataSourceName); if (!file.exists()) { throw new NoSuchDataSourceException(dataSourceName); } final boolean deleted = file.delete(); if (!deleted) { throw new UncheckedIOException(new IOException("Unable to delete file: " + file)); } } }