| /* |
| * 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.solr.handler.dataimport; |
| |
| import java.io.*; |
| import java.lang.invoke.MethodHandles; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Properties; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow; |
| import static org.apache.solr.handler.dataimport.DataImportHandlerException.SEVERE; |
| |
| /** |
| * <p> |
| * A {@link DataSource} which reads from local files |
| * </p> |
| * <p> |
| * The file is read with the default platform encoding. It can be overriden by |
| * specifying the encoding in solrconfig.xml |
| * </p> |
| * <p> |
| * Refer to <a |
| * href="http://wiki.apache.org/solr/DataImportHandler">http://wiki.apache.org/solr/DataImportHandler</a> |
| * for more details. |
| * </p> |
| * <p> |
| * <b>This API is experimental and may change in the future.</b> |
| * |
| * @since solr 1.3 |
| */ |
| public class FileDataSource extends DataSource<Reader> { |
| public static final String BASE_PATH = "basePath"; |
| |
| /** |
| * The basePath for this data source |
| */ |
| protected String basePath; |
| |
| /** |
| * The encoding using which the given file should be read |
| */ |
| protected String encoding = null; |
| |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| @Override |
| public void init(Context context, Properties initProps) { |
| basePath = initProps.getProperty(BASE_PATH); |
| if (initProps.get(URLDataSource.ENCODING) != null) |
| encoding = initProps.getProperty(URLDataSource.ENCODING); |
| } |
| |
| /** |
| * <p> |
| * Returns a reader for the given file. |
| * </p> |
| * <p> |
| * If the given file is not absolute, we try to construct an absolute path |
| * using basePath configuration. If that fails, then the relative path is |
| * tried. If file is not found a RuntimeException is thrown. |
| * </p> |
| * <p> |
| * <b>It is the responsibility of the calling method to properly close the |
| * returned Reader</b> |
| * </p> |
| */ |
| @Override |
| public Reader getData(String query) { |
| File f = getFile(basePath,query); |
| try { |
| return openStream(f); |
| } catch (Exception e) { |
| wrapAndThrow(SEVERE,e,"Unable to open File : "+f.getAbsolutePath()); |
| return null; |
| } |
| } |
| |
| static File getFile(String basePath, String query) { |
| try { |
| File file = new File(query); |
| |
| // If it's not an absolute path, try relative from basePath. |
| if (!file.isAbsolute()) { |
| // Resolve and correct basePath. |
| File basePathFile; |
| if (basePath == null) { |
| basePathFile = new File(".").getAbsoluteFile(); |
| log.warn("FileDataSource.basePath is empty. Resolving to: {}" |
| , basePathFile.getAbsolutePath()); |
| } else { |
| basePathFile = new File(basePath); |
| if (!basePathFile.isAbsolute()) { |
| basePathFile = basePathFile.getAbsoluteFile(); |
| log.warn("FileDataSource.basePath is not absolute. Resolving to: {}" |
| , basePathFile.getAbsolutePath()); |
| } |
| } |
| |
| file = new File(basePathFile, query).getAbsoluteFile(); |
| } |
| |
| if (file.isFile() && file.canRead()) { |
| if (log.isDebugEnabled()) { |
| log.debug("Accessing File: {}", file.getAbsolutePath()); |
| } |
| return file; |
| } else { |
| throw new FileNotFoundException("Could not find file: " + query + |
| " (resolved to: " + file.getAbsolutePath()); |
| } |
| } catch (FileNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Open a {@link java.io.Reader} for the given file name |
| * |
| * @param file a {@link java.io.File} instance |
| * @return a Reader on the given file |
| * @throws FileNotFoundException if the File does not exist |
| * @throws UnsupportedEncodingException if the encoding is unsupported |
| * @since solr 1.4 |
| */ |
| protected Reader openStream(File file) throws FileNotFoundException, |
| UnsupportedEncodingException { |
| if (encoding == null) { |
| return new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8); |
| } else { |
| return new InputStreamReader(new FileInputStream(file), encoding); |
| } |
| } |
| |
| @Override |
| public void close() { |
| |
| } |
| } |