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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.ui.viewers;
import org.eclipse.core.runtime.URIUtil;
import org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
/**
*
* @since 3.5
*/
public class MetadataRepositoryElementComparator extends ViewerComparator {
private int key;
private static final String ENABLED = "XX"; //$NON-NLS-1$ // Value doesn't matter, just that it's not BLANK
private static final String BLANK = ""; //$NON-NLS-1$
private static final int ASCENDING = 1;
private static final int DESCENDING = -1;
private int primaryKeyDirection = ASCENDING;
public MetadataRepositoryElementComparator(int sortKey) {
this.key = sortKey;
}
@Override
public int compare(Viewer viewer, Object obj1, Object obj2) {
MetadataRepositoryElement repo1 = obj1 instanceof MetadataRepositoryElement ? (MetadataRepositoryElement) obj1 : null;
MetadataRepositoryElement repo2 = obj2 instanceof MetadataRepositoryElement ? (MetadataRepositoryElement) obj2 : null;
if (repo1 == null || repo2 == null)
// If these are not both metadata repository elements, use the super class comparator.
return super.compare(viewer, obj1, obj2);
int result = compare(repo1, repo2, key, primaryKeyDirection);
if (result == 0) {
int secondaryKey = getSecondaryKeyFor(key);
if (secondaryKey < 0)
return result;
result = compare(repo1, repo2, secondaryKey, ASCENDING);
if (result == 0)
result = compare(repo1, repo2, getSecondaryKeyFor(secondaryKey), ASCENDING);
}
return result;
}
int compare(MetadataRepositoryElement repo1, MetadataRepositoryElement repo2, int sortKey, int direction) {
String key1, key2;
switch (sortKey) {
case RepositoryDetailsLabelProvider.COL_NAME:
// Compare the repo names
key1 = repo1.getName();
key2 = repo2.getName();
break;
case RepositoryDetailsLabelProvider.COL_LOCATION:
key1 = URIUtil.toUnencodedString(repo1.getLocation());
key2 = URIUtil.toUnencodedString(repo2.getLocation());
break;
default:
// COL_ENABLEMENT
key1 = repo1.isEnabled() ? ENABLED : BLANK;
key2 = repo2.isEnabled() ? ENABLED : BLANK;
break;
}
// If the key is blank (no location, or disabled)..it should appear last
if (key1.length() == 0 && key2.length() > 0)
return direction;
if (key1.length() > 0 && key2.length() == 0)
return direction * -1;
return key1.compareToIgnoreCase(key2) * direction;
}
private int getSecondaryKeyFor(int primaryKey) {
// This is the important one - if sorting by enablement, sort by location, since
// not all repos have a name
if (primaryKey == RepositoryDetailsLabelProvider.COL_ENABLEMENT)
return RepositoryDetailsLabelProvider.COL_LOCATION;
if (primaryKey == RepositoryDetailsLabelProvider.COL_NAME)
return RepositoryDetailsLabelProvider.COL_LOCATION;
// unlikely to have duplicate locations requiring a secondary key
if (primaryKey == RepositoryDetailsLabelProvider.COL_LOCATION)
return RepositoryDetailsLabelProvider.COL_NAME;
return -1;
}
public void sortAscending() {
primaryKeyDirection = ASCENDING;
}
public void sortDescending() {
primaryKeyDirection = DESCENDING;
}
public boolean isAscending() {
return primaryKeyDirection == ASCENDING;
}
public void setSortKey(int key) {
this.key = key;
}
public int getSortKey() {
return key;
}
}
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