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/*******************************************************************************
* Copyright (c) 2011, 2013 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.filesystem.ui.internal.columns;
import java.io.Serializable;
import java.util.Comparator;
import org.eclipse.tcf.te.tcf.filesystem.core.model.FSTreeNode;
/**
* The base comparator for all the file system tree column.
*/
public abstract class FSTreeNodeComparator implements Comparator<Object>, Serializable {
private static final long serialVersionUID = 1L;
/*
* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
@Override
public final int compare(Object o1, Object o2) {
if (!(o1 instanceof FSTreeNode) || !(o2 instanceof FSTreeNode)) return 0;
FSTreeNode node1 = (FSTreeNode)o1;
FSTreeNode node2 = (FSTreeNode)o2;
// Get the type labels
String type1 = node1.type;
String type2 = node2.type;
// Group directories and files always together before sorting by name
if ((node1.isRoot() || node1.isDirectory()) && !(node2.isRoot() || node2.isDirectory())) {
return -1;
}
if ((node2.isRoot() || node2.isDirectory()) && !(node1.isRoot() || node1.isDirectory())) {
return 1;
}
// If the nodes are of the same type and one entry starts
// with a '.', it comes before the one without a '.'
if (type1 != null && type2 != null && type1.equals(type2)) {
return doCompare(node1, node2);
}
return 0;
}
/**
* Sort the node1 and node2 when they are both directories or files.
*
* @param node1 The first node.
* @param node2 The second node.
* @return The comparison result.
*/
public abstract int doCompare(FSTreeNode node1, FSTreeNode node2);
}
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