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/*******************************************************************************
* Copyright (C) 2016, Max Hohenegger <eclipse@hohenegger.eu>
*
* 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
*******************************************************************************/
package org.eclipse.egit.gitflow.ui.internal.dialogs;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.TreeColumn;
/**
* Comparator for {@link FilteredBranchesWidget}.
*
*/
public class BranchComparator extends ViewerComparator {
private TreeColumn currentColumn;
private static final int DESCENDING = SWT.DOWN;
private static final int ASCENDING = SWT.UP;
private int direction = DESCENDING;
private ColumnLabelProvider labelProvider;
/**
* Direction indicator to be supplied to
* {@link org.eclipse.swt.widgets.Tree#setSortDirection(int)}
*
* @return one of <code>UP</code>, <code>DOWN</code> or <code>NONE</code>.
*/
public int getDirection() {
return direction;
}
/**
* Set the column to sort by, flipping sort direction, if the same column
* was set before.
*
* @param column
* to sort by
* @param labelProvider
* to convert cells from selected column into text
*/
public void setColumn(TreeColumn column, ColumnLabelProvider labelProvider) {
this.labelProvider = labelProvider;
if (column.equals(currentColumn)) {
flipSortDirection();
} else {
currentColumn = column;
direction = DESCENDING;
}
}
private void flipSortDirection() {
direction = (direction == DESCENDING) ? ASCENDING : DESCENDING;
}
@Override
public int compare(Viewer viewer, Object e1, Object e2) {
int rc = 0;
String firstCell = labelProvider.getText(e1).toLowerCase();
String secondCell = labelProvider.getText(e2).toLowerCase();
if (direction == DESCENDING) {
rc = secondCell.compareTo(firstCell);
} else {
rc = firstCell.compareTo(secondCell);
}
return rc;
}
}
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