org.eclipse.scada.ca.ui.importer.wizard.DiffEntryLabelProvider.java Source code

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Here is the source code for org.eclipse.scada.ca.ui.importer.wizard.DiffEntryLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2010, 2014 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
 *     IBH SYSTEMS GmbH - add equals check
 *******************************************************************************/
package org.eclipse.scada.ca.ui.importer.wizard;

import java.util.Map;

import org.eclipse.jface.resource.ColorDescriptor;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.jface.viewers.CellLabelProvider;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.scada.ca.data.DiffEntry;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;

public class DiffEntryLabelProvider extends CellLabelProvider {

    private static final int MAX_STR_LENGTH = 200;

    private final Color equalFgColor;

    private final ResourceManager resourceManager;

    private final ColorDescriptor equalFgColorDesc = ColorDescriptor.createFrom(new RGB(127, 127, 127));

    public DiffEntryLabelProvider(final ResourceManager resourceManager) {
        this.resourceManager = resourceManager;
        this.equalFgColor = resourceManager.createColor(this.equalFgColorDesc);
    }

    @Override
    public void dispose() {
        this.resourceManager.destroyColor(this.equalFgColorDesc);
    }

    @Override
    public void update(final ViewerCell cell) {
        final Object ele = cell.getElement();

        if (ele instanceof DiffEntry) {
            final DiffEntry entry = (DiffEntry) ele;

            final int idx = cell.getColumnIndex();
            switch (idx) {
            case 0:
                cell.setText(entry.getFactoryId());
                break;

            case 1:
                cell.setText(entry.getConfigurationId());
                break;

            case 2:
                cell.setText(entry.getOperation().toString());
                break;

            case 3:
                cell.setText(formatData(entry.getAddedOrUpdatedData(), MAX_STR_LENGTH));
                break;

            case 4:
                cell.setText(formatData(entry.getOldData(), MAX_STR_LENGTH));
                break;
            }
        }

        else if (ele instanceof DiffSubEntry) {
            final DiffSubEntry entry = (DiffSubEntry) ele;

            final int idx = cell.getColumnIndex();

            final boolean isEqual = equals(entry.getNewValue(), entry.getOldValue());
            if (isEqual) {
                cell.setForeground(this.equalFgColor);
            }

            switch (idx) {
            case 0:
                break;

            case 1:
                cell.setText(entry.getKey());
                break;

            case 2:
                break;

            case 3:
                cell.setText(entry.getNewValue());
                break;

            case 4:
                cell.setText(entry.getOldValue());
                break;
            }
        }
    }

    private boolean equals(final String newValue, final String oldValue) {
        if (newValue == oldValue) {
            return true;
        }

        if (newValue == null) {
            return false;
        }

        return newValue.equals(oldValue);
    }

    private String formatData(final Map<String, String> data, final int maxLen) {
        if (data == null) {
            return null;
        }

        final String str = data.toString();
        if (maxLen > 0 && str.length() > maxLen) {
            return str.substring(0, maxLen) + "";
        } else {
            return str;
        }
    }

}