/*
Copyright 2010, 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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in the documentation and/or other materials provided with the
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/
package com.google.refine.commands;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONObject;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Project;
import com.google.refine.process.Process;
/**
* Convenient super class for commands that perform abstract operations on
* only the filtered rows based on the faceted browsing engine's configuration
* on the client side.
*
* The engine's configuration is passed over as a POST body parameter. It is
* retrieved, de-serialized, and used to construct the abstract operation.
* The operation is then used to construct a process. The process is then
* queued for execution. If the process is not long running and there is no
* other queued process, then it gets executed right away, resulting in some
* change to the history. Otherwise, it is pending. The client side can
* decide how to update its UI depending on whether the process is done or
* still pending.
*
* Note that there are interactions on the client side that change only
* individual cells or individual rows (such as starring one row or editing
* the text of one cell). These interactions do not depend on the faceted
* browsing engine's configuration, and so they don't invoke commands that
* subclass this class. See AnnotateOneRowCommand and EditOneCellCommand as
* examples.
*/
abstract public class EngineDependentCommand extends Command {
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
Project project = getProject(request);
AbstractOperation op = createOperation(project, request, getEngineConfig(request));
Process process = op.createProcess(project, new Properties());
performProcessAndRespond(request, response, project, process);
} catch (Exception e) {
respondException(response, e);
}
}
abstract protected AbstractOperation createOperation(
Project project, HttpServletRequest request, JSONObject engineConfig) throws Exception;
}