com.opcoach.e34.tools.views.MigrationDataComparator.java Source code

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Here is the source code for com.opcoach.e34.tools.views.MigrationDataComparator.java

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/*******************************************************************************
 * Copyright (c) 2014 OPCoach.
 * 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:
 *     OPCoach - initial API and implementation
 *******************************************************************************/
package com.opcoach.e34.tools.views;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;

/**
* An entry comparator for the table, dealing with column index, keys and
* values
*/
public class MigrationDataComparator extends ViewerComparator {
    private int columnIndex;
    private int direction;
    private ILabelProvider labelProvider;

    public MigrationDataComparator(int columnIndex, ILabelProvider defaultLabelProvider) {
        this.columnIndex = columnIndex;
        direction = SWT.UP;
        labelProvider = defaultLabelProvider;
    }

    public int getDirection() {
        return direction;
    }

    /** Called when click on table header, reverse order */
    public void setColumn(int column) {
        if (column == columnIndex) {
            // Same column as last sort; toggle the direction
            direction = (direction == SWT.UP) ? SWT.DOWN : SWT.UP;
        } else {
            // New column; do a descending sort
            columnIndex = column;
            direction = SWT.DOWN;
        }
    }

    @Override
    public int compare(Viewer viewer, Object e1, Object e2) {
        // Compare the text from label provider.
        String lp1 = labelProvider.getText(e1);
        String lp2 = labelProvider.getText(e2);
        String s1 = lp1 == null ? "" : lp1.toLowerCase();
        String s2 = lp2 == null ? "" : lp2.toLowerCase();
        int rc = s1.compareTo(s2);
        // If descending order, flip the direction
        return (direction == SWT.DOWN) ? -rc : rc;
    }

    public void setLabelProvider(ILabelProvider textProvider) {
        labelProvider = textProvider;
    }

}