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package com.google.refine.commands.row;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.Engine.Mode;
import com.google.refine.browsing.FilteredRecords;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RecordVisitor;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.commands.Command;
import com.google.refine.importing.ImportingJob;
import com.google.refine.importing.ImportingManager;
import com.google.refine.model.Project;
import com.google.refine.model.Record;
import com.google.refine.model.Row;
import com.google.refine.sorting.SortingRecordVisitor;
import com.google.refine.sorting.SortingRowVisitor;
import com.google.refine.util.ParsingUtilities;
import com.google.refine.util.Pool;
public class GetRowsCommand extends Command {
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
internalRespond(request, response);
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
internalRespond(request, response);
}
protected void internalRespond(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
Project project = null;
// This command also supports retrieving rows for an importing job.
String importingJobID = request.getParameter("importingJobID");
if (importingJobID != null) {
long jobID = Long.parseLong(importingJobID);
ImportingJob job = ImportingManager.getJob(jobID);
if (job != null) {
project = job.project;
}
}
if (project == null) {
project = getProject(request);
}
Engine engine = getEngine(request, project);
String callback = request.getParameter("callback");
int start = Math.min(project.rows.size(), Math.max(0, getIntegerParameter(request, "start", 0)));
int limit = Math.min(project.rows.size() - start, Math.max(0, getIntegerParameter(request, "limit", 20)));
Pool pool = new Pool();
Properties options = new Properties();
options.put("project", project);
options.put("reconCandidateOmitTypes", true);
options.put("pool", pool);
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Type", callback == null ? "application/json" : "text/javascript");
PrintWriter writer = response.getWriter();
if (callback != null) {
writer.write(callback);
writer.write("(");
}
JSONWriter jsonWriter = new JSONWriter(writer);
jsonWriter.object();
RowWritingVisitor rwv = new RowWritingVisitor(start, limit, jsonWriter, options);
JSONObject sortingJson = null;
try{
String json = request.getParameter("sorting");
sortingJson = (json == null) ? null :
ParsingUtilities.evaluateJsonStringToObject(json);
} catch (JSONException e) {
}
if (engine.getMode() == Mode.RowBased) {
FilteredRows filteredRows = engine.getAllFilteredRows();
RowVisitor visitor = rwv;
if (sortingJson != null) {
SortingRowVisitor srv = new SortingRowVisitor(visitor);
srv.initializeFromJSON(project, sortingJson);
if (srv.hasCriteria()) {
visitor = srv;
}
}
jsonWriter.key("mode"); jsonWriter.value("row-based");
jsonWriter.key("rows"); jsonWriter.array();
filteredRows.accept(project, visitor);
jsonWriter.endArray();
jsonWriter.key("filtered"); jsonWriter.value(rwv.total);
jsonWriter.key("total"); jsonWriter.value(project.rows.size());
} else {
FilteredRecords filteredRecords = engine.getFilteredRecords();
RecordVisitor visitor = rwv;
if (sortingJson != null) {
SortingRecordVisitor srv = new SortingRecordVisitor(visitor);
srv.initializeFromJSON(project, sortingJson);
if (srv.hasCriteria()) {
visitor = srv;
}
}
jsonWriter.key("mode"); jsonWriter.value("record-based");
jsonWriter.key("rows"); jsonWriter.array();
filteredRecords.accept(project, visitor);
jsonWriter.endArray();
jsonWriter.key("filtered"); jsonWriter.value(rwv.total);
jsonWriter.key("total"); jsonWriter.value(project.recordModel.getRecordCount());
}
jsonWriter.key("start"); jsonWriter.value(start);
jsonWriter.key("limit"); jsonWriter.value(limit);
jsonWriter.key("pool"); pool.write(jsonWriter, options);
jsonWriter.endObject();
if (callback != null) {
writer.write(")");
}
} catch (Exception e) {
respondException(response, e);
}
}
static protected class RowWritingVisitor implements RowVisitor, RecordVisitor {
final int start;
final int limit;
final JSONWriter writer;
final Properties options;
public int total;
public RowWritingVisitor(int start, int limit, JSONWriter writer, Properties options) {
this.start = start;
this.limit = limit;
this.writer = writer;
this.options = options;
}
@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) {
if (total >= start && total < start + limit) {
internalVisit(project, rowIndex, row);
}
total++;
return false;
}
@Override
public boolean visit(Project project, Record record) {
if (total >= start && total < start + limit) {
internalVisit(project, record);
}
total++;
return false;
}
public boolean internalVisit(Project project, int rowIndex, Row row) {
try {
options.put("rowIndex", rowIndex);
row.write(writer, options);
} catch (JSONException e) {
}
return false;
}
protected boolean internalVisit(Project project, Record record) {
options.put("recordIndex", record.recordIndex);
for (int r = record.fromRowIndex; r < record.toRowIndex; r++) {
try {
Row row = project.rows.get(r);
options.put("rowIndex", r);
row.write(writer, options);
} catch (JSONException e) {
}
options.remove("recordIndex");
}
return false;
}
}
}