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RandomSec/main/src/com/google/refine/operations/column/ColumnAdditionByFetchingURLsOperation.java

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/*
Copyright 2010, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"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,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.refine.operations.column;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.expr.EvalError;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.expr.MetaParser;
import com.google.refine.expr.WrappedCell;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
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.model.changes.CellAtRow;
import com.google.refine.model.changes.ColumnAdditionChange;
import com.google.refine.operations.EngineDependentOperation;
import com.google.refine.operations.OnError;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.operations.cell.TextTransformOperation;
import com.google.refine.process.LongRunningProcess;
import com.google.refine.process.Process;
import com.google.refine.util.ParsingUtilities;
public class ColumnAdditionByFetchingURLsOperation extends EngineDependentOperation {
final protected String _baseColumnName;
final protected String _urlExpression;
final protected OnError _onError;
final protected String _newColumnName;
final protected int _columnInsertIndex;
final protected int _delay;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.getJSONObject("engineConfig");
return new ColumnAdditionByFetchingURLsOperation(
engineConfig,
obj.getString("baseColumnName"),
obj.getString("urlExpression"),
TextTransformOperation.stringToOnError(obj.getString("onError")),
obj.getString("newColumnName"),
obj.getInt("columnInsertIndex"),
obj.getInt("delay")
);
}
public ColumnAdditionByFetchingURLsOperation(
JSONObject engineConfig,
String baseColumnName,
String urlExpression,
OnError onError,
String newColumnName,
int columnInsertIndex,
int delay
) {
super(engineConfig);
_baseColumnName = baseColumnName;
_urlExpression = urlExpression;
_onError = onError;
_newColumnName = newColumnName;
_columnInsertIndex = columnInsertIndex;
_delay = delay;
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("op"); writer.value(OperationRegistry.s_opClassToName.get(this.getClass()));
writer.key("description"); writer.value(getBriefDescription(null));
writer.key("engineConfig"); writer.value(getEngineConfig());
writer.key("newColumnName"); writer.value(_newColumnName);
writer.key("columnInsertIndex"); writer.value(_columnInsertIndex);
writer.key("baseColumnName"); writer.value(_baseColumnName);
writer.key("urlExpression"); writer.value(_urlExpression);
writer.key("onError"); writer.value(TextTransformOperation.onErrorToString(_onError));
writer.key("delay"); writer.value(_delay);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Create column " + _newColumnName +
" at index " + _columnInsertIndex +
" by fetching URLs based on column " + _baseColumnName +
" using expression " + _urlExpression;
}
protected String createDescription(Column column, List<CellAtRow> cellsAtRows) {
return "Create new column " + _newColumnName +
", filling " + cellsAtRows.size() +
" rows by fetching URLs based on column " + column.getName() +
" and formulated as " + _urlExpression;
}
@Override
public Process createProcess(Project project, Properties options) throws Exception {
Engine engine = createEngine(project);
engine.initializeFromJSON(_engineConfig);
Evaluable eval = MetaParser.parse(_urlExpression);
return new ColumnAdditionByFetchingURLsProcess(
project,
engine,
eval,
getBriefDescription(null)
);
}
public class ColumnAdditionByFetchingURLsProcess extends LongRunningProcess implements Runnable {
final protected Project _project;
final protected Engine _engine;
final protected Evaluable _eval;
final protected long _historyEntryID;
protected int _cellIndex;
public ColumnAdditionByFetchingURLsProcess(
Project project,
Engine engine,
Evaluable eval,
String description
) throws JSONException {
super(description);
_project = project;
_engine = engine;
_eval = eval;
_historyEntryID = HistoryEntry.allocateID();
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("id"); writer.value(hashCode());
writer.key("description"); writer.value(_description);
writer.key("immediate"); writer.value(false);
writer.key("status"); writer.value(_thread == null ? "pending" : (_thread.isAlive() ? "running" : "done"));
writer.key("progress"); writer.value(_progress);
writer.endObject();
}
@Override
protected Runnable getRunnable() {
return this;
}
@Override
public void run() {
Column column = _project.columnModel.getColumnByName(_baseColumnName);
if (column == null) {
_project.processManager.onFailedProcess(this, new Exception("No column named " + _baseColumnName));
return;
}
if (_project.columnModel.getColumnByName(_newColumnName) != null) {
_project.processManager.onFailedProcess(this, new Exception("Another column already named " + _newColumnName));
return;
}
List<CellAtRow> urls = new ArrayList<CellAtRow>(_project.rows.size());
FilteredRows filteredRows = _engine.getAllFilteredRows();
filteredRows.accept(_project, createRowVisitor(urls));
List<CellAtRow> responseBodies = new ArrayList<CellAtRow>(urls.size());
for (int i = 0; i < urls.size(); i++) {
CellAtRow urlData = urls.get(i);
CellAtRow cellAtRow = fetch(urlData);
if (cellAtRow != null) {
responseBodies.add(cellAtRow);
}
_progress = i * 100 / urls.size();
try {
Thread.sleep(_delay);
} catch (InterruptedException e) {
if (_canceled) {
break;
}
}
}
if (!_canceled) {
HistoryEntry historyEntry = new HistoryEntry(
_historyEntryID,
_project,
_description,
ColumnAdditionByFetchingURLsOperation.this,
new ColumnAdditionChange(
_newColumnName,
_columnInsertIndex,
responseBodies)
);
_project.history.addEntry(historyEntry);
_project.processManager.onDoneProcess(this);
}
}
CellAtRow fetch(CellAtRow urlData) {
String urlString = urlData.cell.value.toString();
URL url = null;
try {
url = new URL(urlString);
} catch (MalformedURLException e) {
return null;
}
try {
URLConnection urlConnection = url.openConnection();
// urlConnection.setRequestProperty(_headerKey, _headerValue);
try {
InputStream is = urlConnection.getInputStream();
try {
String encoding = urlConnection.getContentEncoding();
if (encoding == null) {
String contentType = urlConnection.getContentType();
if (contentType != null) {
final String charsetEqual = "charset=";
int c = contentType.lastIndexOf(charsetEqual);
if (c > 0) {
encoding = contentType.substring(c + charsetEqual.length());
}
}
}
return new CellAtRow(
urlData.row,
new Cell(
ParsingUtilities.inputStreamToString(
is, encoding != null ? encoding : "UTF-8"),
null));
} finally {
is.close();
}
} catch (IOException e) {
String message;
if (urlConnection instanceof HttpURLConnection) {
int status = ((HttpURLConnection)urlConnection).getResponseCode();
String errorString = "";
InputStream errorStream = ((HttpURLConnection)urlConnection).getErrorStream();
if (errorStream != null) {
errorString = ParsingUtilities.inputStreamToString(errorStream);
}
message = String.format("HTTP error %d : %s | %s",status,
((HttpURLConnection)urlConnection).getResponseMessage(),
errorString);
} else {
message = e.toString();
}
return _onError == OnError.StoreError ?
new CellAtRow(urlData.row, new Cell(new EvalError(message), null)) : null;
}
} catch (Exception e) {
return _onError == OnError.StoreError ?
new CellAtRow(urlData.row, new Cell(new EvalError(e.getMessage()), null)) : null;
}
}
RowVisitor createRowVisitor(List<CellAtRow> cellsAtRows) {
return new RowVisitor() {
int cellIndex;
Properties bindings;
List<CellAtRow> cellsAtRows;
public RowVisitor init(List<CellAtRow> cellsAtRows) {
Column column = _project.columnModel.getColumnByName(_baseColumnName);
this.cellIndex = column.getCellIndex();
this.bindings = ExpressionUtils.createBindings(_project);
this.cellsAtRows = cellsAtRows;
return this;
}
@Override
public void start(Project project) {
// nothing to do
}
@Override
public void end(Project project) {
// nothing to do
}
@Override
public boolean visit(Project project, int rowIndex, Row row) {
Cell cell = row.getCell(cellIndex);
Cell newCell = null;
ExpressionUtils.bind(bindings, row, rowIndex, _baseColumnName, cell);
Object o = _eval.evaluate(bindings);
if (o != null) {
if (o instanceof Cell) {
newCell = (Cell) o;
} else if (o instanceof WrappedCell) {
newCell = ((WrappedCell) o).cell;
} else {
Serializable v = ExpressionUtils.wrapStorable(o);
if (ExpressionUtils.isNonBlankData(v)) {
newCell = new Cell(v.toString(), null);
}
}
}
if (newCell != null) {
cellsAtRows.add(new CellAtRow(rowIndex, newCell));
}
return false;
}
}.init(cellsAtRows);
}
}
}
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