123614539d
git-svn-id: http://google-refine.googlecode.com/svn/trunk@2171 7d457c2a-affb-35e4-300a-418c747d4874
114 lines
3.5 KiB
Java
114 lines
3.5 KiB
Java
/*
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Copyright 2010, Google Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.google.refine.history;
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import java.util.Properties;
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import org.json.JSONException;
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import org.json.JSONWriter;
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import com.google.refine.model.Project;
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import com.google.refine.process.Process;
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import com.google.refine.process.ProcessManager;
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/**
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* The process for undoing or redoing. This involves calling apply() and revert()
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* on changes.
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*/
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public class HistoryProcess extends Process {
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final protected Project _project;
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final protected long _lastDoneID;
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final protected String _description;
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protected boolean _done = false;
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private final static String WARN = "Not a long-running process";
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public HistoryProcess(Project project, long lastDoneID) {
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_project = project;
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_lastDoneID = lastDoneID;
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if (_lastDoneID == 0) {
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_description = "Undo all";
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} else {
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HistoryEntry entry = _project.history.getEntry(_lastDoneID);
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_description = "Undo/redo until after " + entry.description;
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}
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}
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@Override
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public void cancel() {
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throw new RuntimeException(WARN);
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}
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@Override
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public boolean isImmediate() {
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return true;
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}
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@Override
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public HistoryEntry performImmediate() {
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_project.history.undoRedo(_lastDoneID);
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_done = true;
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return null;
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}
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@Override
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public void startPerforming(ProcessManager manager) {
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throw new RuntimeException(WARN);
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}
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@Override
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public void write(JSONWriter writer, Properties options)
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throws JSONException {
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writer.object();
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writer.key("description"); writer.value(_description);
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writer.key("immediate"); writer.value(true);
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writer.key("status"); writer.value(_done ? "done" : "pending");
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writer.endObject();
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}
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@Override
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public boolean isDone() {
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throw new RuntimeException(WARN);
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}
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@Override
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public boolean isRunning() {
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throw new RuntimeException(WARN);
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}
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}
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