| /******************************************************************************* |
| * Copyright (c) 2009, 2015 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.help.internal.base.util; |
| |
| import org.eclipse.help.IIndex; |
| import org.eclipse.help.IIndexEntry; |
| import org.eclipse.help.IIndexSee; |
| import org.eclipse.help.IIndexSubpath; |
| import org.eclipse.help.IUAElement; |
| import org.eclipse.help.internal.UAElement; |
| |
| public class IndexUtils { |
| |
| /** |
| * Return a path representing all of the elements in the path of the see target |
| * For example if the see targets Eclipse / PDE the result will be an array |
| * of length 2 containing the entries for Eclipse and for PDE in that order |
| * @param index The index containing this see element or null to discover the index |
| * in this routine. |
| */ |
| public static IIndexEntry[] findSeeTargets(IUAElement index, IIndexSee see, int depth) { |
| if (index == null && see instanceof UAElement) { |
| UAElement ancestor = ((UAElement)see).getParentElement(); |
| while (!(ancestor instanceof IIndex)) { |
| if (ancestor == null) { |
| return new IIndexEntry[0]; |
| } |
| ancestor = ancestor.getParentElement(); |
| } |
| index = ancestor; |
| } |
| String[] path = getPath(see); |
| IUAElement[] children = index.getChildren(); |
| for (int i = 0; i < children.length; i++) { |
| if (children[i] instanceof IIndexEntry) { |
| IIndexEntry indexEntry = (IIndexEntry)children[i]; |
| String entryKeyword = indexEntry.getKeyword(); |
| if (path[depth].equals(entryKeyword)) { |
| if (path.length == depth + 1) { |
| return new IIndexEntry[] { indexEntry }; |
| } |
| IIndexEntry[] targets = findSeeTargets(indexEntry, see, depth + 1); |
| IIndexEntry[] result = new IIndexEntry[targets.length + 1]; |
| result[0] = indexEntry; |
| System.arraycopy(targets, 0, result, 1, targets.length); |
| return result; |
| } |
| } |
| } |
| return new IIndexEntry[0]; |
| } |
| |
| public static String[] getPath(IIndexSee see) { |
| IIndexSubpath[] subpaths = see.getSubpathElements(); |
| String[] result = new String[1 + subpaths.length]; |
| result[0] = see.getKeyword(); |
| for (int i = 0; i < subpaths.length; i++) { |
| result[i + 1] = subpaths[i].getKeyword(); |
| } |
| return result; |
| } |
| |
| } |