| /* |
| * 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.oodt.cas.pge.writers; |
| |
| //Google static imports |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| //JDK imports |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.util.List; |
| import java.util.logging.Logger; |
| |
| //Google imports |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.Lists; |
| |
| //OODT imports |
| import org.apache.oodt.cas.metadata.Metadata; |
| |
| /** |
| * CSV {@link SciPgeConfigFileWriter} which takes a comma separted list of |
| * {@link String}s as the first index of the args and generates a CSV file from |
| * the metadata fields listed. For example, if the list of {@link String}s given |
| * is: |
| * |
| * <pre> |
| * InputFiles,IsText |
| * </pre> |
| * |
| * And: |
| * |
| * <pre> |
| * InputFiles=File1.txt,File2.dat,File3.xml |
| * IsText=true,false,true |
| * </pre> |
| * |
| * Then the CSV file create will look like: |
| * |
| * <pre> |
| * InputFiles,IsText |
| * File1.text,true |
| * File2.dat,false |
| * File3.xml,true |
| * </pre> |
| * |
| * @author bfoster (Brian Foster) |
| */ |
| public class CsvConfigFileWriter extends DynamicConfigFileWriter { |
| |
| private static final int HEADER_INDEX = 0; |
| private static final int DELIM_INDEX = 0; |
| |
| private static final String DEFAULT_DELIM = ","; |
| |
| @Override |
| public File generateFile(String filePath, Metadata metadata, Logger logger, |
| Object... customArgs) throws Exception { |
| checkArgument(customArgs.length > 0, |
| CsvConfigFileWriter.class.getCanonicalName() |
| + " has no args specified"); |
| List<String> header = checkNotNull( |
| Lists.newArrayList(Splitter.on(",").split( |
| (String) customArgs[HEADER_INDEX])), |
| "Must specify CSV header in args at index = '" + HEADER_INDEX + "'"); |
| String delim = DEFAULT_DELIM; |
| if (customArgs.length > DELIM_INDEX) { |
| delim = (String) customArgs[DELIM_INDEX]; |
| } |
| |
| return writeCsvFile(filePath, header, generateRows(header, metadata), |
| delim); |
| } |
| |
| @VisibleForTesting |
| protected List<List<String>> generateRows(List<String> header, |
| Metadata meatadata) { |
| List<List<String>> rows = Lists.newArrayList(); |
| int index = 0; |
| TOP: while (true) { |
| for (String columnName : header) { |
| List<String> values = meatadata.getAllMetadata(columnName); |
| if (values.size() <= index) { |
| break TOP; |
| } |
| List<String> row = rows.get(index); |
| if (row == null) { |
| row = Lists.newArrayList(); |
| } |
| row.add(values.get(index)); |
| rows.set(index, row); |
| } |
| } |
| return rows; |
| } |
| |
| @VisibleForTesting |
| protected File writeCsvFile(String file, List<String> header, |
| List<List<String>> rows, String delim) throws IOException { |
| File outputFile = new File(file); |
| PrintStream ps = null; |
| try { |
| ps = new PrintStream(new FileOutputStream(outputFile)); |
| ps.println(Joiner.on(delim).join(header)); |
| for (List<String> row : rows) { |
| ps.println(Joiner.on(delim).join(row)); |
| } |
| return outputFile; |
| } catch (Exception e) { |
| throw new IOException("Failed to write CSV file '" + file + "' : " |
| + e.getMessage(), e); |
| } finally { |
| try { |
| ps.close(); |
| } catch (Exception ignore) { |
| } |
| } |
| } |
| } |