seeit3d.base.core.handler.DefaultVisualizationStateChecker.java Source code

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Here is the source code for seeit3d.base.core.handler.DefaultVisualizationStateChecker.java

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/**
 * Copyright (C) 2010  David Montao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package seeit3d.base.core.handler;

import java.util.List;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import seeit3d.base.core.api.IVisualizationStateChecker;
import seeit3d.base.error.ErrorHandler;
import seeit3d.base.model.Container;

import com.google.inject.Singleton;

/**
 * This class is responsible for validating if the visualization state is valid and can be processed
 * 
 * @author David Montao
 * 
 */
@Singleton
public class DefaultVisualizationStateChecker implements IVisualizationStateChecker {

    private static final int CONTAINERS_THRESHOLD = 20;

    private static final int POLYCYLINDERS_THRESHOLD = 2000;

    private volatile Boolean answer;

    @Override
    public boolean checkState(List<Container> containers) {
        boolean askNeeded = false;
        if (containers.size() > CONTAINERS_THRESHOLD) {
            askNeeded = true;
        }
        int polycylinders = 0;
        for (Container container : containers) {
            polycylinders += container.countPolyCylinders();
        }
        if (polycylinders > POLYCYLINDERS_THRESHOLD) {
            askNeeded = true;
        }

        if (askNeeded) {
            answer = null;
            Display.getDefault().syncExec(new Runnable() {
                @Override
                public void run() {
                    Shell shell = new Shell(Display.getCurrent());
                    boolean confirm = MessageDialog.open(MessageDialog.CONFIRM, shell,
                            "Possibly too much information",
                            "Too much information is about to be visualized, it could block your computer.\nAre you sure you want to continue?",
                            SWT.NONE);
                    answer = new Boolean(confirm);
                }
            });

            while (answer == null) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    ErrorHandler.error(e);
                }
            }
            return answer;
        } else {
            return true;
        }
    }

}