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package com.google.refine.operations.row;
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.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.model.changes.RowRemovalChange;
import com.google.refine.operations.EngineDependentOperation;
import com.google.refine.operations.OperationRegistry;
public class RowRemovalOperation extends EngineDependentOperation {
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.getJSONObject("engineConfig");
return new RowRemovalOperation(
engineConfig
);
}
public RowRemovalOperation(JSONObject engineConfig) {
super(engineConfig);
}
@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.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Remove rows";
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
Engine engine = createEngine(project);
List<Integer> rowIndices = new ArrayList<Integer>();
FilteredRows filteredRows = engine.getAllFilteredRows();
filteredRows.accept(project, createRowVisitor(project, rowIndices));
return new HistoryEntry(
historyEntryID,
project,
"Remove " + rowIndices.size() + " rows",
this,
new RowRemovalChange(rowIndices)
);
}
protected RowVisitor createRowVisitor(Project project, List<Integer> rowIndices) throws Exception {
return new RowVisitor() {
List<Integer> rowIndices;
public RowVisitor init(List<Integer> rowIndices) {
this.rowIndices = rowIndices;
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) {
rowIndices.add(rowIndex);
return false;
}
}.init(rowIndices);
}
}