org.openscada.ui.chart.viewer.DataItemSeriesViewer.java Source code

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Here is the source code for org.openscada.ui.chart.viewer.DataItemSeriesViewer.java

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/*
 * This file is part of the openSCADA project
 * Copyright (C) 2011-2012 TH4 SYSTEMS GmbH (http://th4-systems.com)
 *
 * openSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * openSCADA 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with openSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */

package org.openscada.ui.chart.viewer;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.databinding.EMFObservables;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.resource.ResourceManager;
import org.openscada.da.ui.connection.data.Item.Type;
import org.openscada.ui.chart.model.ChartModel.ChartPackage;
import org.openscada.ui.chart.model.ChartModel.DataItemSeries;
import org.openscada.ui.chart.model.ChartModel.IdItem;
import org.openscada.ui.chart.model.ChartModel.Item;
import org.openscada.ui.chart.model.ChartModel.UriItem;
import org.openscada.ui.chart.model.ChartModel.XAxis;
import org.openscada.ui.chart.model.ChartModel.YAxis;
import org.openscada.ui.chart.viewer.input.ChartInput;
import org.openscada.ui.chart.viewer.input.ItemObserver;

public class DataItemSeriesViewer extends AbstractItemInputViewer implements InputViewer {
    public static final String PROP_INPUT = "input"; //$NON-NLS-1$

    private final IObservableValue inputObservable;

    private final IObservableValue linePropertiesObservable;

    private ItemObserver input;

    public DataItemSeriesViewer(final DataBindingContext dbc, final DataItemSeries element,
            final ChartViewer viewer, final ResourceManager resourceManager,
            final AxisLocator<XAxis, XAxisViewer> xLocator, final AxisLocator<YAxis, YAxisViewer> yLocator) {
        super(dbc, element, viewer, resourceManager, xLocator, yLocator);

        this.inputObservable = BeansObservables.observeValue(this, PROP_INPUT);
        this.linePropertiesObservable = EMFObservables.observeValue(element,
                ChartPackage.Literals.DATA_ITEM_SERIES__LINE_PROPERTIES);

        addBindings(LinePropertiesBinder.bind(SWTObservables.getRealm(viewer.getChartRenderer().getDisplay()), dbc,
                this.inputObservable, this.linePropertiesObservable));

        setInputObserable(this.inputObservable);
    }

    @Override
    public void dispose() {
        this.inputObservable.dispose();
        this.linePropertiesObservable.dispose();
    }

    @Override
    protected void checkCreateInput() {
        if (this.item != null && this.xAxis != null && this.yAxis != null) {
            final org.openscada.da.ui.connection.data.Item item = makeItem(this.item);
            if (item == null) {
                return;
            }

            final ItemObserver input = new ItemObserver(this.viewer, item, this.viewer.getRealm(),
                    this.xAxis.getAxis(), this.yAxis.getAxis(), this.resourceManager);
            this.viewer.addInput(input);
            setInput(input);
        }
    }

    private void setInput(final ItemObserver input) {
        firePropertyChange(PROP_INPUT, this.input, this.input = input);
    }

    public ItemObserver getInput() {
        return this.input;
    }

    private org.openscada.da.ui.connection.data.Item makeItem(final Item item) {
        if (item instanceof IdItem) {
            return new org.openscada.da.ui.connection.data.Item(((IdItem) item).getConnectionId(), item.getItemId(),
                    Type.ID);
        } else if (item instanceof UriItem) {
            return new org.openscada.da.ui.connection.data.Item(((UriItem) item).getConnectionUri(),
                    item.getItemId(), Type.URI);
        } else {
            return null;
        }
    }

    @Override
    public boolean provides(final ChartInput input) {
        return this.input == input;
    }

    @Override
    protected void disposeInput() {
        if (this.input != null) {
            this.viewer.removeInput(this.input);
            this.input.dispose();
            setInput(null);
        }
    }

}