/*
Copyright 2011, Google Inc.
All rights reserved.
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* Redistributions in binary form must reproduce the above
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this software without specific prior written permission.
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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*/
package com.google.refine.importers.tree;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.List;
import org.apache.commons.lang.NotImplementedException;
import org.json.JSONObject;
import com.google.refine.ProjectMetadata;
import com.google.refine.importers.ImporterUtilities;
import com.google.refine.importers.ImporterUtilities.MultiFileReadingProgress;
import com.google.refine.importers.ImportingParserBase;
import com.google.refine.importing.ImportingJob;
import com.google.refine.importing.ImportingUtilities;
import com.google.refine.model.Project;
import com.google.refine.util.JSONUtilities;
/**
* Abstract class for importer parsers which handle tree-shaped data
* (currently XML & JSON).
*/
abstract public class TreeImportingParserBase extends ImportingParserBase {
protected TreeImportingParserBase(final boolean useInputStream) {
super(useInputStream);
}
@Override
public JSONObject createParserUIInitializationData(ImportingJob job,
List<JSONObject> fileRecords, String format) {
JSONObject options = super.createParserUIInitializationData(job, fileRecords, format);
JSONUtilities.safePut(options, "trimStrings", false);
JSONUtilities.safePut(options, "guessCellValueTypes", false);
JSONUtilities.safePut(options, "storeEmptyStrings", true);
return options;
}
@Override
public void parse(Project project, ProjectMetadata metadata,
ImportingJob job, List<JSONObject> fileRecords, String format,
int limit, JSONObject options, List<Exception> exceptions) {
MultiFileReadingProgress progress = ImporterUtilities.createMultiFileReadingProgress(job, fileRecords);
ImportColumnGroup rootColumnGroup = new ImportColumnGroup();
for (JSONObject fileRecord : fileRecords) {
try {
parseOneFile(project, metadata, job, fileRecord, rootColumnGroup, limit, options, exceptions, progress);
} catch (IOException e) {
exceptions.add(e);
}
if (limit > 0 && project.rows.size() >= limit) {
break;
}
}
rootColumnGroup.tabulate();
XmlImportUtilities.createColumnsFromImport(project, rootColumnGroup);
project.columnModel.update();
}
public void parseOneFile(
Project project,
ProjectMetadata metadata,
ImportingJob job,
JSONObject fileRecord,
ImportColumnGroup rootColumnGroup,
int limit,
JSONObject options,
List<Exception> exceptions,
final MultiFileReadingProgress progress
) throws IOException {
final File file = ImportingUtilities.getFile(job, fileRecord);
final String fileSource = ImportingUtilities.getFileSource(fileRecord);
progress.startFile(fileSource);
try {
InputStream inputStream = ImporterUtilities.openAndTrackFile(fileSource, file, progress);
try {
if (useInputStream) {
parseOneFile(project, metadata, job, fileSource, inputStream,
rootColumnGroup, limit, options, exceptions);
} else {
String commonEncoding = JSONUtilities.getString(options, "encoding", null);
if (commonEncoding != null && commonEncoding.isEmpty()) {
commonEncoding = null;
}
Reader reader = ImportingUtilities.getFileReader(file, fileRecord, commonEncoding);
parseOneFile(project, metadata, job, fileSource, reader,
rootColumnGroup, limit, options, exceptions);
}
} finally {
inputStream.close();
}
} finally {
progress.endFile(fileSource, file.length());
}
}
/**
* Parse a single file from a Reader.
*
* The default implementation just throws a NotImplementedException.
* Override in subclasses to implement.
*/
public void parseOneFile(
Project project,
ProjectMetadata metadata,
ImportingJob job,
String fileSource,
Reader reader,
ImportColumnGroup rootColumnGroup,
int limit,
JSONObject options,
List<Exception> exceptions
) {
throw new NotImplementedException();
}
/**
* Parse a single file from an InputStream.
*
* The default implementation just throws a NotImplementedException.
* Override in subclasses to implement.
*/
public void parseOneFile(
Project project,
ProjectMetadata metadata,
ImportingJob job,
String fileSource,
InputStream inputStream,
ImportColumnGroup rootColumnGroup,
int limit,
JSONObject options,
List<Exception> exceptions
) {
throw new NotImplementedException();
}
/**
* Parse a single file from a TreeReader.
*
*/
protected void parseOneFile(
Project project,
ProjectMetadata metadata,
ImportingJob job,
String fileSource,
TreeReader treeParser,
ImportColumnGroup rootColumnGroup,
int limit,
JSONObject options,
List<Exception> exceptions
) {
String[] recordPath = JSONUtilities.getStringArray(options, "recordPath");
int limit2 = JSONUtilities.getInt(options, "limit", -1);
if (limit > 0) {
if (limit2 > 0) {
limit2 = Math.min(limit, limit2);
} else {
limit2 = limit;
}
}
if (limit2 == 0) { // shouldn't really happen, but be sure since 0 is stop signal
limit2 = -1;
}
// NOTE: these defaults are solely to preserve historical behavior.
// All new code should override them to keep input data from being modified
boolean trimStrings = JSONUtilities.getBoolean(options, "trimStrings", true);
boolean storeEmptyStrings = JSONUtilities.getBoolean(options, "storeEmptyStrings", false);
boolean guessCellValueTypes = JSONUtilities.getBoolean(options, "guessCellValueTypes", true);
boolean includeFileSources = JSONUtilities.getBoolean(options, "includeFileSources", false);
int filenameColumnIndex = -1;
if (includeFileSources) {
filenameColumnIndex = addFilenameColumn(project);
// If the column add fails for any reason, we'll end up overwriting data in the first column
assert filenameColumnIndex == 0;
}
XmlImportUtilities.importTreeData(treeParser, project, recordPath, rootColumnGroup, limit2,
new ImportParameters(trimStrings, storeEmptyStrings, guessCellValueTypes, includeFileSources,
fileSource));
}
}