org.jreserve.gui.calculations.api.AbstractCalculationProvider.java Source code

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Here is the source code for org.jreserve.gui.calculations.api.AbstractCalculationProvider.java

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/*
 *  Copyright (C) 2013, Peter Decsi.
 * 
 *  This library is free software: you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public 
 *  License as published by the Free Software Foundation, either 
 *  version 3 of the License, or (at your option) any later version.
 * 
 *  This library 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 Lesser General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jreserve.gui.calculations.api;

import java.io.IOException;
import org.jdom2.Element;
import org.jreserve.gui.misc.audit.event.AuditedObject;
import org.jreserve.gui.misc.namedcontent.ProjectContentProvider;
import org.jreserve.gui.misc.utils.tasks.TaskUtil;
import org.jreserve.gui.misc.utils.widgets.Displayable;
import org.jreserve.gui.wrapper.jdom.JDomUtil;
import org.jreserve.jrlib.CalculationData;
import org.netbeans.api.project.FileOwnerQuery;
import org.netbeans.api.project.Project;

/**
 *
 * @author Peter Decsi
 * @version 1.0
 */
public abstract class AbstractCalculationProvider<C extends CalculationData>
        implements CalculationProvider<C>, AuditedObject {

    private final Project project;
    private String path;
    protected final CalculationEventUtil events;
    protected final Object lock;
    private C calculation;

    protected AbstractCalculationProvider(CalculationDataObject obj) {
        this.events = new CalculationEventUtil(this);
        this.lock = obj.lock;
        this.project = FileOwnerQuery.getOwner(obj.getPrimaryFile());
        path = Displayable.Utils.displayProjectPath(obj.getPrimaryFile());
    }

    @Override
    public Project getProject() {
        return project;
    }

    @Override
    public String getPath() {
        synchronized (lock) {
            return path;
        }
    }

    protected void setPath(String path) {
        synchronized (lock) {
            this.path = path;
        }
    }

    @Override
    public Project getAuditedProject() {
        return project;
    }

    @Override
    public String getAuditName() {
        return getPath();
    }

    protected final boolean calculationExists() {
        synchronized (lock) {
            return calculation != null;
        }
    }

    protected abstract Element toXml();

    protected <T> T lookupSource(Class<T> clazz, Element root, String sourceTag) throws IOException {
        if (project == null)
            return null;

        Element dse = JDomUtil.getExistingChild(root, sourceTag);

        String sPath = dse.getTextTrim();
        if (sPath == null || sPath.length() == 0)
            return null;

        ProjectContentProvider pol = project.getLookup().lookup(ProjectContentProvider.class);
        if (pol == null)
            return null;

        return pol.getContent(sPath, clazz);
    }

    @Override
    public C getCalculation() {
        synchronized (lock) {
            if (calculation == null) {
                recalculate();
                return createDummyCalculation();
            }
            return calculation;
        }
    }

    protected abstract C createDummyCalculation();

    protected final void recalculateIfExists() {
        synchronized (lock) {
            if (calculation != null)
                recalculate();
        }
    }

    protected final void recalculate() {
        synchronized (lock) {
            Calculator<C> calculator = createCalculator();
            TaskUtil.execute(new CalculatorTask(calculator));
        }
    }

    protected abstract Calculator<C> createCalculator();

    public static interface Calculator<C extends CalculationData> {
        C createCalculation();
    }

    private class CalculatorTask implements Runnable {

        private final Calculator<C> calculator;

        private CalculatorTask(Calculator<C> calculator) {
            this.calculator = calculator;
        }

        @Override
        public void run() {
            final C calculation = calculator.createCalculation();
            synchronized (lock) {
                AbstractCalculationProvider.this.calculation = calculation;
                events.fireValueChanged(calculation);
            }
        }
    }
}