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package com.google.refine.freebase.operations;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Writer;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.freebase.protograph.Protograph;
import com.google.refine.history.Change;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Project;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.util.ParsingUtilities;
import com.google.refine.util.Pool;
public class SaveProtographOperation extends AbstractOperation {
final protected Protograph _protograph;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
return new SaveProtographOperation(
Protograph.reconstruct(obj.getJSONObject("protograph"))
);
}
public SaveProtographOperation(Protograph protograph) {
_protograph = protograph;
}
@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("protograph"); _protograph.write(writer, options);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Save schema alignment skeleton";
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
Change change = new ProtographChange(_protograph);
return new HistoryEntry(historyEntryID, project, getBriefDescription(project), SaveProtographOperation.this, change);
}
static public class ProtographChange implements Change {
final protected Protograph _newProtograph;
protected Protograph _oldProtograph;
public ProtographChange(Protograph protograph) {
_newProtograph = protograph;
}
@Override
public void apply(Project project) {
synchronized (project) {
_oldProtograph = (Protograph) project.overlayModels.get("freebaseProtograph");
project.overlayModels.put("freebaseProtograph", _newProtograph);
}
}
@Override
public void revert(Project project) {
synchronized (project) {
if (_oldProtograph == null) {
project.overlayModels.remove("freebaseProtograph");
} else {
project.overlayModels.put("freebaseProtograph", _oldProtograph);
}
}
}
@Override
public void save(Writer writer, Properties options) throws IOException {
writer.write("newProtograph="); writeProtograph(_newProtograph, writer); writer.write('\n');
writer.write("oldProtograph="); writeProtograph(_oldProtograph, writer); writer.write('\n');
writer.write("/ec/\n"); // end of change marker
}
static public Change load(LineNumberReader reader, Pool pool) throws Exception {
Protograph oldProtograph = null;
Protograph newProtograph = null;
String line;
while ((line = reader.readLine()) != null && !"/ec/".equals(line)) {
int equal = line.indexOf('=');
CharSequence field = line.subSequence(0, equal);
String value = line.substring(equal + 1);
if ("oldProtograph".equals(field) && value.length() > 0) {
oldProtograph = Protograph.reconstruct(ParsingUtilities.evaluateJsonStringToObject(value));
} else if ("newProtograph".equals(field) && value.length() > 0) {
newProtograph = Protograph.reconstruct(ParsingUtilities.evaluateJsonStringToObject(value));
}
}
ProtographChange change = new ProtographChange(newProtograph);
change._oldProtograph = oldProtograph;
return change;
}
static protected void writeProtograph(Protograph p, Writer writer) throws IOException {
if (p != null) {
JSONWriter jsonWriter = new JSONWriter(writer);
try {
p.write(jsonWriter, new Properties());
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}