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WDTK support for processing Wikibase dump files
package org.wikidata.wdtk.dumpfiles;
/*
* #%L
* Wikidata Toolkit Dump File Handling
* %%
* Copyright (C) 2014 - 2015 Wikidata Toolkit Developers
* %%
* Licensed 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.
* #L%
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wikidata.wdtk.util.CompressionType;
import org.wikidata.wdtk.util.DirectoryManager;
import org.wikidata.wdtk.util.DirectoryManagerFactory;
/**
* Class for representing dump files that are found at arbitrary (local) file
* paths. The meta-data for the dump file (content type, time stamp, etc.) can
* be set explicitly, or be guessed from the file name (to the extent possible).
*
* @author Markus Damm
* @author Markus Kroetzsch
*/
public class MwLocalDumpFile implements MwDumpFile {
static final Logger logger = LoggerFactory.getLogger(MwLocalDumpFile.class);
/**
* Date stamp when the dump file was created. If there is no date stamp
* given or found, it is set to "YYYYMMDD"
*/
final String dateStamp;
/**
* Project name of the dump file
*/
final String projectName;
/**
* Name of the dump file in the file system
*/
final String dumpFileName;
/**
* Absolute path to the dump file
*/
final Path dumpFilePath;
/**
* Type of this dumpfile
*/
final DumpContentType dumpContentType;
/**
* DirectoryManager for accessing the dumpfile
*/
DirectoryManager directoryManager;
/**
* True if the given file is available (exists).
*/
final boolean isAvailable;
/**
* Hash map defining the compression type of each type of dump.
*/
static final Map COMPRESSION_TYPE = new HashMap();
static {
MwLocalDumpFile.COMPRESSION_TYPE.put(DumpContentType.DAILY,
CompressionType.BZ2);
MwLocalDumpFile.COMPRESSION_TYPE.put(DumpContentType.CURRENT,
CompressionType.BZ2);
MwLocalDumpFile.COMPRESSION_TYPE.put(DumpContentType.FULL,
CompressionType.BZ2);
MwLocalDumpFile.COMPRESSION_TYPE.put(DumpContentType.SITES,
CompressionType.GZIP);
MwLocalDumpFile.COMPRESSION_TYPE.put(DumpContentType.JSON,
CompressionType.GZIP);
}
/**
* Constructor. The DumpContentType will be inferred by the name of the
* file, if possible. If it is not possible, it will be set to JSON by
* default.
*
* @param filepath
* Path to the dump file in the file system
*/
public MwLocalDumpFile(String filepath) {
this(filepath, null, null, null);
}
/**
* Constructor.
*
* @param filePath
* Path to the dump file in the file system
* @param dumpContentType
* DumpContentType of the dump file, or null if not known to
* guess it from file name; this information is essential to
* invoke the correct processing code to read the dump file
* @param dateStamp
* dump date in format YYYYMMDD, or null if not known to guess it
* from file name; this is mainly used for logs and messages
* @param projectName
* project name string, or null to use a default string; this is
* mainly used for logs and messages
*/
public MwLocalDumpFile(String filePath, DumpContentType dumpContentType,
String dateStamp, String projectName) {
this.dumpFilePath = Paths.get(filePath).toAbsolutePath();
this.dumpFileName = this.dumpFilePath.getFileName().toString();
try {
this.directoryManager = DirectoryManagerFactory
.createDirectoryManager(this.dumpFilePath.getParent(), true);
} catch (IOException e) {
this.directoryManager = null;
logger.error("Could not access local dump file: " + e.toString());
}
if (dumpContentType == null) {
this.dumpContentType = guessDumpContentType(this.dumpFileName);
} else {
this.dumpContentType = dumpContentType;
}
if (dateStamp == null) {
this.dateStamp = guessDumpDate(this.dumpFileName);
} else {
this.dateStamp = dateStamp;
}
if (projectName == null) {
this.projectName = "LOCAL";
} else {
this.projectName = projectName;
}
this.isAvailable = this.directoryManager != null
&& this.directoryManager.hasFile(this.dumpFileName);
}
/**
* Returns the absolute path to this dump file.
*
* @return path
*/
public Path getPath() {
return this.dumpFilePath;
}
@Override
public boolean isAvailable() {
return this.isAvailable;
}
@Override
public String getProjectName() {
return this.projectName;
}
@Override
public String getDateStamp() {
return this.dateStamp;
}
@Override
public DumpContentType getDumpContentType() {
return this.dumpContentType;
}
@Override
public InputStream getDumpFileStream() throws IOException {
if (!isAvailable()) {
throw new IOException("Local dump file \""
+ this.dumpFilePath.toString()
+ "\" is not available for reading.");
}
return this.directoryManager.getInputStreamForFile(this.dumpFileName,
MwLocalDumpFile.COMPRESSION_TYPE.get(this.dumpContentType));
}
@Override
public BufferedReader getDumpFileReader() throws IOException {
return new BufferedReader(new InputStreamReader(getDumpFileStream(),
StandardCharsets.UTF_8));
}
@Override
public void prepareDumpFile() {
// nothing to do
}
@Override
public String toString() {
return this.dumpFilePath.toString() + " (" + this.projectName + "/"
+ getDumpContentType().toString().toLowerCase() + "/"
+ this.dateStamp + ")";
}
/**
* Guess the type of the given dump from its filename.
*
* @param fileName
* @return dump type, defaulting to JSON if no type was found
*/
private static DumpContentType guessDumpContentType(String fileName) {
String lcDumpName = fileName.toLowerCase();
if (lcDumpName.contains(".json.gz")) {
return DumpContentType.JSON;
} else if (lcDumpName.contains(".sql.gz")) {
return DumpContentType.SITES;
} else if (lcDumpName.contains(".xml.bz2")) {
if (lcDumpName.contains("daily")) {
return DumpContentType.DAILY;
} else if (lcDumpName.contains("current")) {
return DumpContentType.CURRENT;
} else {
return DumpContentType.FULL;
}
} else {
logger.warn("Could not guess type of the dump file \"" + fileName
+ "\". Defaulting to json.gz.");
return DumpContentType.JSON;
}
}
/**
* Guess the date of the dump from the given dump file name.
*
* @param fileName
* @return 8-digit date stamp or YYYYMMDD if none was found
*/
private static String guessDumpDate(String fileName) {
Pattern p = Pattern.compile("([0-9]{8})");
Matcher m = p.matcher(fileName);
if (m.find()) {
return m.group(1);
} else {
logger.info("Could not guess date of the dump file \"" + fileName
+ "\". Defaulting to YYYYMMDD.");
return "YYYYMMDD";
}
}
}
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