| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.jackrabbit.oak.index.indexer.document.flatfile; |
| |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import com.google.common.collect.ImmutableSet; |
| |
| public class PathElementComparator implements Comparator<Iterable<String>> { |
| private final Set<String> preferred; |
| |
| public PathElementComparator() { |
| this(Collections.emptySet()); |
| } |
| |
| public PathElementComparator(Iterable<String> preferredPathElements) { |
| this.preferred = ImmutableSet.copyOf(preferredPathElements); |
| } |
| |
| @Override |
| public int compare(Iterable<String> p1, Iterable<String> p2) { |
| Iterator<String> i1 = p1.iterator(); |
| Iterator<String> i2 = p2.iterator(); |
| |
| //Shorter paths come first i.e. first parent then children |
| //Also Rank jcr:content higher i.e. first child |
| while (i1.hasNext() || i2.hasNext()) { |
| if (!i1.hasNext()) { |
| return -1; |
| } |
| if (!i2.hasNext()) { |
| return 1; |
| } |
| |
| String pe1 = i1.next(); |
| String pe2 = i2.next(); |
| |
| boolean pe1Preferred = preferred.contains(pe1); |
| boolean pe2Preferred = preferred.contains(pe2); |
| |
| if (pe1Preferred && !pe2Preferred) { |
| return -1; |
| } |
| |
| if (pe2Preferred && !pe1Preferred) { |
| return 1; |
| } |
| |
| int compare = pe1.compareTo(pe2); |
| if (compare != 0) { |
| return compare; |
| } |
| } |
| return 0; |
| } |
| } |