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Factored out registries of importers and exporters.

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git-svn-id: http://google-refine.googlecode.com/svn/trunk@1183 7d457c2a-affb-35e4-300a-418c747d4874
This commit is contained in:
David Huynh 2010-08-22 01:46:32 +00:00
parent 7320f65935
commit 4ea765b689
4 changed files with 141 additions and 120 deletions
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98
main/src/com/google/gridworks/commands/project/CreateProjectCommand.java
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@ -43,6 +43,7 @@ import com.google.gridworks.ProjectManager;
import com.google.gridworks.ProjectMetadata;
import com.google.gridworks.commands.Command;
import com.google.gridworks.importers.Importer;
import com.google.gridworks.importers.ImporterRegistry;
import com.google.gridworks.importers.ReaderImporter;
import com.google.gridworks.importers.StreamImporter;
import com.google.gridworks.importers.TsvCsvImporter;
@ -57,71 +58,6 @@ public class CreateProjectCommand extends Command {
final static Logger logger = LoggerFactory.getLogger("create-project_command");
static final private Map<String, Importer> importers = new HashMap<String, Importer>();
private static final String[][] importerNames = {
{"ExcelImporter", "com.google.gridworks.importers.ExcelImporter"},
{"XmlImporter", "com.google.gridworks.importers.XmlImporter"},
{"RdfTripleImporter", "com.google.gridworks.importers.RdfTripleImporter"},
{"MarcImporter", "com.google.gridworks.importers.MarcImporter"},
{"TsvCsvImporter", "com.google.gridworks.importers.TsvCsvImporter"},
};
static {
registerImporters(importerNames);
}
static public boolean registerImporters(String[][] importers) {
boolean status = true;
for (String[] importer : importerNames) {
String importerName = importer[0];
String className = importer[1];
logger.debug("Loading command " + importerName + " class: " + className);
Importer cmd;
try {
// TODO: May need to use the servlet container's class loader here
cmd = (Importer) Class.forName(className).newInstance();
} catch (InstantiationException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
} catch (IllegalAccessException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
} catch (ClassNotFoundException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
}
status |= registerImporter(importerName, cmd);
}
return status;
}
/**
* Register a single importer.
*
* @param name
* importer verb for importer
* @param commandObject
* object implementing the importer
* @return true if importer was loaded and registered successfully
*/
static public boolean registerImporter(String name,
Importer importerObject) {
if (importers.containsKey(name)) {
return false;
}
importers.put(name, importerObject);
return true;
}
// Currently only for test purposes
static protected boolean unregisterImporter(String verb) {
return importers.remove(verb) != null;
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
@ -369,7 +305,7 @@ public class CreateProjectCommand extends Command {
}
private void load(Project project, Properties options, String fileName, InputStream inputStream) throws Exception {
Importer importer = guessImporter(null, fileName);
Importer importer = ImporterRegistry.guessImporter(null, fileName);
internalInvokeImporter(project, importer, options, inputStream, null);
}
@ -415,7 +351,7 @@ public class CreateProjectCommand extends Command {
URLConnection connection = null;
// Try for a URL importer first
Importer importer = guessUrlImporter(url);
Importer importer = ImporterRegistry.guessUrlImporter(url);
if (importer instanceof UrlImporter) {
((UrlImporter) importer).read(url, project, options);
} else {
@ -436,7 +372,7 @@ public class CreateProjectCommand extends Command {
}
try {
importer = guessImporter(connection.getContentType(), url.getPath());
importer = ImporterRegistry.guessImporter(connection.getContentType(), url.getPath());
internalInvokeImporter(project, importer, options, inputStream, connection.getContentEncoding());
} finally {
@ -506,30 +442,4 @@ public class CreateProjectCommand extends Command {
importer.read(reader, project, options);
}
protected Importer guessImporter(String contentType, String fileName, boolean provideDefault) {
for (Importer i : importers.values()){
if(i.canImportData(contentType, fileName)){
return i;
}
}
if (provideDefault) {
return new TsvCsvImporter(); // default
} else {
return null;
}
}
protected Importer guessImporter(String contentType, String filename) {
return guessImporter(contentType, filename, true);
}
protected Importer guessUrlImporter(URL url) {
for (Importer importer : importers.values()){
if (importer instanceof UrlImporter
&& ((UrlImporter) importer).canImportData(url)) {
return importer;
}
}
return null;
}
}

27
main/src/com/google/gridworks/commands/project/ExportRowsCommand.java
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@ -3,8 +3,6 @@ package com.google.gridworks.commands.project;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import javax.servlet.ServletException;
@ -16,32 +14,11 @@ import com.google.gridworks.browsing.Engine;
import com.google.gridworks.commands.Command;
import com.google.gridworks.exporters.CsvExporter;
import com.google.gridworks.exporters.Exporter;
import com.google.gridworks.exporters.HtmlTableExporter;
import com.google.gridworks.exporters.TemplatingExporter;
import com.google.gridworks.exporters.XlsExporter;
import com.google.gridworks.exporters.ProtographTransposeExporter.MqlwriteLikeExporter;
import com.google.gridworks.exporters.ProtographTransposeExporter.TripleLoaderExporter;
import com.google.gridworks.exporters.ExporterRegistry;
import com.google.gridworks.model.Project;
public class ExportRowsCommand extends Command {
static final protected Map<String, Exporter> s_formatToExporter = new HashMap<String, Exporter>();
static {
s_formatToExporter.put("html", new HtmlTableExporter());
s_formatToExporter.put("xls", new XlsExporter());
s_formatToExporter.put("csv", new CsvExporter());
s_formatToExporter.put("template", new TemplatingExporter());
s_formatToExporter.put("tripleloader", new TripleLoaderExporter());
s_formatToExporter.put("mqlwrite", new MqlwriteLikeExporter());
}
static public void registerExporter(String format, Exporter exporter) {
s_formatToExporter.put(format, exporter);
}
@SuppressWarnings("unchecked")
static public Properties getRequestParameters(HttpServletRequest request) {
Properties options = new Properties();
@ -64,7 +41,7 @@ public class ExportRowsCommand extends Command {
String format = request.getParameter("format");
Properties options = getRequestParameters(request);
Exporter exporter = s_formatToExporter.get(format.toLowerCase());
Exporter exporter = ExporterRegistry.getExporter(format);
if (exporter == null){
exporter = new CsvExporter('\t');
}

31
main/src/com/google/gridworks/exporters/ExporterRegistry.java Normal file
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@ -0,0 +1,31 @@
package com.google.gridworks.exporters;
import java.util.HashMap;
import java.util.Map;
import com.google.gridworks.exporters.ProtographTransposeExporter.MqlwriteLikeExporter;
import com.google.gridworks.exporters.ProtographTransposeExporter.TripleLoaderExporter;
abstract public class ExporterRegistry {
static final private Map<String, Exporter> s_formatToExporter = new HashMap<String, Exporter>();
static {
s_formatToExporter.put("html", new HtmlTableExporter());
s_formatToExporter.put("xls", new XlsExporter());
s_formatToExporter.put("csv", new CsvExporter());
s_formatToExporter.put("template", new TemplatingExporter());
s_formatToExporter.put("tripleloader", new TripleLoaderExporter());
s_formatToExporter.put("mqlwrite", new MqlwriteLikeExporter());
}
static public void registerExporter(String format, Exporter exporter) {
s_formatToExporter.put(format.toLowerCase(), exporter);
}
static public Exporter getExporter(String format) {
return s_formatToExporter.get(format.toLowerCase());
}
}

103
main/src/com/google/gridworks/importers/ImporterRegistry.java Normal file
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@ -0,0 +1,103 @@
package com.google.gridworks.importers;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
abstract public class ImporterRegistry {
final static Logger logger = LoggerFactory.getLogger("importer-registry");
static final private Map<String, Importer> importers = new HashMap<String, Importer>();
private static final String[][] importerNames = {
{"ExcelImporter", "com.google.gridworks.importers.ExcelImporter"},
{"XmlImporter", "com.google.gridworks.importers.XmlImporter"},
{"RdfTripleImporter", "com.google.gridworks.importers.RdfTripleImporter"},
{"MarcImporter", "com.google.gridworks.importers.MarcImporter"},
{"TsvCsvImporter", "com.google.gridworks.importers.TsvCsvImporter"}
};
static {
registerImporters(importerNames);
}
static public boolean registerImporters(String[][] importers) {
boolean status = true;
for (String[] importer : importerNames) {
String importerName = importer[0];
String className = importer[1];
logger.debug("Loading command " + importerName + " class: " + className);
Importer cmd;
try {
// TODO: May need to use the servlet container's class loader here
cmd = (Importer) Class.forName(className).newInstance();
} catch (InstantiationException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
} catch (IllegalAccessException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
} catch (ClassNotFoundException e) {
logger.error("Failed to load importer class " + className, e);
status = false;
continue;
}
status |= registerImporter(importerName, cmd);
}
return status;
}
/**
* Register a single importer.
*
* @param name importer verb for importer
* @param importerObject object implementing the importer
*
* @return true if importer was loaded and registered successfully
*/
static public boolean registerImporter(String name, Importer importerObject) {
if (importers.containsKey(name)) {
return false;
}
importers.put(name, importerObject);
return true;
}
// Currently only for test purposes
static protected boolean unregisterImporter(String verb) {
return importers.remove(verb) != null;
}
static public Importer guessImporter(String contentType, String fileName, boolean provideDefault) {
for (Importer i : importers.values()){
if(i.canImportData(contentType, fileName)){
return i;
}
}
if (provideDefault) {
return new TsvCsvImporter(); // default
} else {
return null;
}
}
static public Importer guessImporter(String contentType, String filename) {
return guessImporter(contentType, filename, true);
}
static public Importer guessUrlImporter(URL url) {
for (Importer importer : importers.values()){
if (importer instanceof UrlImporter
&& ((UrlImporter) importer).canImportData(url)) {
return importer;
}
}
return null;
}
}