org.eclipse.wst.server.ui.internal.view.servers.ServerViewerComparator.java Source code

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Here is the source code for org.eclipse.wst.server.ui.internal.view.servers.ServerViewerComparator.java

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/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation 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:
 *     IBM Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.server.ui.internal.view.servers;

import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

public class ServerViewerComparator extends ViewerComparator {
    public static final int MAX_DEPTH = 3;
    public static final int ASCENDING = 1;
    public static final int DESCENDING = -1;

    protected ServerTableLabelProvider labelProvider;

    protected int[] priorities = new int[] { 0 };

    protected int[] directions = new int[] { ASCENDING };

    public ServerViewerComparator(ServerTableLabelProvider labelProvider) {
        this.labelProvider = labelProvider;
    }

    public void setTopPriority(int priority) {
        if (priorities[0] == priority)
            return;

        int len = priorities.length + 1;
        if (len > MAX_DEPTH)
            len = MAX_DEPTH;

        int[] temp = new int[len];
        System.arraycopy(priorities, 0, temp, 1, len - 1);
        temp[0] = priority;
        priorities = temp;

        temp = new int[len];
        System.arraycopy(directions, 0, temp, 1, len - 1);
        temp[0] = ASCENDING;
        directions = temp;
    }

    public int getTopPriority() {
        return priorities[0];
    }

    public void setTopPriorityDirection(int direction) {
        if (direction == ASCENDING || direction == DESCENDING) {
            directions[0] = direction;
        }
    }

    public int getTopPriorityDirection() {
        return directions[0];
    }

    public void reverseTopPriority() {
        directions[0] *= -1;
    }

    public int compare(Viewer viewer, Object e1, Object e2, int a) {
        int col = priorities[a];

        String s1 = labelProvider.getColumnText(e1, col);
        String s2 = labelProvider.getColumnText(e2, col);

        int s = s1.compareToIgnoreCase(s2) * directions[a];
        if (s == 0) {
            if (a == priorities.length - 1)
                return 0;
            return compare(viewer, e1, e2, a + 1);
        }
        return s;
    }

    public int compare(Viewer viewer, Object e1, Object e2) {
        return compare(viewer, e1, e2, 0);
    }
}