/*
Copyright 2011, Google Inc.
All rights reserved.
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modification, are permitted provided that the following conditions are
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* Redistributions of source code must retain the above copyright
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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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*/
package com.google.refine.importers;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.json.JSONObject;
import com.google.refine.ProjectMetadata;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.importing.ImportingJob;
import com.google.refine.model.Cell;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.util.JSONUtilities;
abstract public class TabularImportingParserBase extends ImportingParserBase {
static public interface TableDataReader {
public List<Object> getNextRowOfCells() throws IOException;
}
@Override
public JSONObject createParserUIInitializationData(ImportingJob job,
List<JSONObject> fileRecords, String format) {
JSONObject options = super.createParserUIInitializationData(job, fileRecords, format);
JSONUtilities.safePut(options, "ignoreLines", -1); // number of blank lines at the beginning to ignore
JSONUtilities.safePut(options, "headerLines", 1); // number of header lines
JSONUtilities.safePut(options, "skipDataLines", 0); // number of initial data lines to skip
JSONUtilities.safePut(options, "storeBlankRows", true);
JSONUtilities.safePut(options, "storeBlankCellsAsNulls", true);
return options;
}
/**
* @param useInputStream true if parser takes an InputStream, false if it takes a Reader.
*
*/
protected TabularImportingParserBase(boolean useInputStream) {
super(useInputStream);
}
static public void readTable(
Project project,
ProjectMetadata metadata,
ImportingJob job,
TableDataReader reader,
String fileSource,
int limit,
JSONObject options,
List<Exception> exceptions
) {
int ignoreLines = JSONUtilities.getInt(options, "ignoreLines", -1);
int headerLines = JSONUtilities.getInt(options, "headerLines", 1);
int skipDataLines = JSONUtilities.getInt(options, "skipDataLines", 0);
int limit2 = JSONUtilities.getInt(options, "limit", -1);
if (limit > 0) {
if (limit2 > 0) {
limit2 = Math.min(limit, limit2);
} else {
limit2 = limit;
}
}
boolean guessCellValueTypes = JSONUtilities.getBoolean(options, "guessCellValueTypes", false);
boolean storeBlankRows = JSONUtilities.getBoolean(options, "storeBlankRows", true);
boolean storeBlankCellsAsNulls = JSONUtilities.getBoolean(options, "storeBlankCellsAsNulls", true);
boolean includeFileSources = JSONUtilities.getBoolean(options, "includeFileSources", false);
int filenameColumnIndex = -1;
if (includeFileSources) {
filenameColumnIndex = addFilenameColumn(project);
}
List<String> columnNames = new ArrayList<String>();
boolean hasOurOwnColumnNames = headerLines > 0;
List<Object> cells = null;
int rowsWithData = 0;
try {
while (!job.canceled && (cells = reader.getNextRowOfCells()) != null) {
if (ignoreLines > 0) {
ignoreLines--;
continue;
}
if (headerLines > 0) { // header lines
for (int c = 0; c < cells.size(); c++) {
Object cell = cells.get(c);
String columnName;
if (cell == null) {
// add column even if cell is blank
columnName = "";
} else if (cell instanceof Cell) {
columnName = ((Cell) cell).value.toString().trim();
} else {
columnName = cell.toString().trim();
}
ImporterUtilities.appendColumnName(columnNames, c, columnName);
}
headerLines--;
if (headerLines == 0) {
ImporterUtilities.setupColumns(project, columnNames);
}
} else { // data lines
Row row = new Row(columnNames.size());
if (storeBlankRows) {
rowsWithData++;
} else if (cells.size() > 0) {
rowsWithData++;
}
if (skipDataLines <= 0 || rowsWithData > skipDataLines) {
boolean rowHasData = false;
for (int c = 0; c < cells.size(); c++) {
Column column = ImporterUtilities.getOrAllocateColumn(
project, columnNames, c, hasOurOwnColumnNames);
Object value = cells.get(c);
if (value instanceof Cell) {
row.setCell(column.getCellIndex(), (Cell) value);
rowHasData = true;
} else if (ExpressionUtils.isNonBlankData(value)) {
Serializable storedValue;
if (value instanceof String) {
storedValue = guessCellValueTypes ?
ImporterUtilities.parseCellValue((String) value) : (String) value;
} else {
storedValue = ExpressionUtils.wrapStorable(value);
}
row.setCell(column.getCellIndex(), new Cell(storedValue, null));
rowHasData = true;
} else if (!storeBlankCellsAsNulls) {
row.setCell(column.getCellIndex(), new Cell("", null));
} else {
row.setCell(column.getCellIndex(), null);
}
}
if (rowHasData || storeBlankRows) {
if (includeFileSources && filenameColumnIndex >= 0) {
row.setCell(
filenameColumnIndex,
new Cell(fileSource, null));
}
project.rows.add(row);
}
if (limit2 > 0 && project.rows.size() >= limit2) {
break;
}
}
}
}
} catch (IOException e) {
exceptions.add(e);
}
}
}