org.eclipse.scada.hd.ui.connection.views.ConnectionLabelProvider.java Source code

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Here is the source code for org.eclipse.scada.hd.ui.connection.views.ConnectionLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2009, 2013 TH4 SYSTEMS GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.scada.hd.ui.connection.views;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Arrays;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.scada.hd.QueryState;
import org.eclipse.scada.hd.data.QueryParameters;
import org.eclipse.scada.hd.ui.connection.internal.ItemListWrapper;
import org.eclipse.scada.hd.ui.connection.internal.ItemWrapper;
import org.eclipse.scada.hd.ui.connection.internal.QueryBufferBean;
import org.eclipse.scada.hd.ui.connection.internal.QueryWrapper;
import org.eclipse.scada.ui.databinding.CommonListeningLabelProvider;
import org.eclipse.scada.ui.databinding.StyledViewerLabel;
import org.eclipse.scada.hd.ui.data.AbstractQueryBuffer;
import org.eclipse.scada.hd.ui.data.QueryBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ConnectionLabelProvider extends CommonListeningLabelProvider implements PropertyChangeListener {

    private final static Logger logger = LoggerFactory.getLogger(ConnectionLabelProvider.class);

    private final ResourceManager resource = new LocalResourceManager(JFaceResources.getResources());

    public ConnectionLabelProvider() {
        super("org.eclipse.scada.hd.ui.connection.provider");
    }

    @Override
    public void dispose() {
        this.resource.dispose();
        super.dispose();
    }

    @Override
    public void updateLabel(final StyledViewerLabel label, final Object element) {
        if (element instanceof ItemWrapper) {
            updateItem(label, (ItemWrapper) element);
        } else if (element instanceof ItemListWrapper) {
            label.setImage(this.resource
                    .createImage(ImageDescriptor.createFromFile(ConnectionLabelProvider.class, "icons/items.gif"))); //$NON-NLS-1$
            label.setText(Messages.ConnectionLabelProvider_Items);
        } else if (element instanceof QueryWrapper) {
            label.setImage(this.resource.createImage(
                    ImageDescriptor.createFromFile(ConnectionLabelProvider.class, "icons/queries.gif"))); //$NON-NLS-1$
            label.setText(Messages.ConnectionLabelProvider_Queries);
        } else if (element instanceof QueryBufferBean) {
            updateQuery(label, (QueryBufferBean) element);
        } else {
            super.updateLabel(label, element);
        }
    }

    private void updateQuery(final StyledViewerLabel label, final QueryBufferBean query) {
        label.setImage(this.resource
                .createImage(ImageDescriptor.createFromFile(ConnectionLabelProvider.class, "icons/query.gif"))); //$NON-NLS-1$

        final StyledString text = new StyledString();
        text.append(query.getItemId());
        text.append(" " + getQueryParameterInfo(query), StyledString.COUNTER_STYLER); //$NON-NLS-1$
        final QueryState state = query.getState();
        text.append(" [" + (state != null ? state : "<unknown>") + "]", StyledString.DECORATIONS_STYLER); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

        label.setStyledText(text);
    }

    private String getQueryParameterInfo(final QueryBufferBean query) {
        final QueryParameters parameters = query.getQueryParameters();

        if (parameters != null) {
            return parameters.toString();
        } else {
            return ""; //$NON-NLS-1$
        }
    }

    private void updateItem(final StyledViewerLabel label, final ItemWrapper element) {
        label.setText(element.getItemInformation().getItemId());
        label.setImage(this.resource
                .createImage(ImageDescriptor.createFromFile(ConnectionLabelProvider.class, "icons/item.gif"))); //$NON-NLS-1$
    }

    @Override
    protected void addListenerTo(final Object next) {
        super.addListenerTo(next);
        if (next instanceof QueryBufferBean) {
            logger.debug("Adding query: {}", next); //$NON-NLS-1$
            ((QueryBufferBean) next).addPropertyChangeListener(this);
            fireChangeEvent(Arrays.asList(next));
        }
    }

    @Override
    protected void removeListenerFrom(final Object next) {
        if (next instanceof QueryBufferBean) {
            ((QueryBufferBean) next).removePropertyChangeListener(this);
        }
        super.removeListenerFrom(next);
    }

    @Override
    public void propertyChange(final PropertyChangeEvent evt) {
        logger.debug("Property change: {}"); //$NON-NLS-1$
        if (evt.getSource() instanceof QueryBuffer) {
            final String propName = evt.getPropertyName();
            // don't fire changes for "percent filled" or "filled", they come to often and are not shown
            if (!AbstractQueryBuffer.PROP_PERCENT_FILLED.equals(propName)
                    && !AbstractQueryBuffer.PROP_FILLED.equals(propName)) {
                fireChangeEvent(Arrays.asList(evt.getSource()));
            }
        }
    }

}