| /* |
| * 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.plugins.index.property; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.jackrabbit.oak.api.PropertyValue; |
| import org.apache.jackrabbit.oak.api.Type; |
| import org.apache.jackrabbit.oak.spi.query.Filter; |
| import org.apache.jackrabbit.oak.spi.query.Filter.PropertyRestriction; |
| import org.jetbrains.annotations.Nullable; |
| |
| import static com.google.common.collect.Sets.newLinkedHashSet; |
| |
| public final class ValuePatternUtil { |
| /** |
| * Get the longest prefix of restrictions on a property. |
| * |
| * @param filter the filter with all restrictions |
| * @param property the property |
| * @return the longest prefix, or null if none |
| */ |
| @Nullable |
| public static String getLongestPrefix(Filter filter, String property) { |
| boolean first = false, last = false; |
| List<String> list = new ArrayList<>(); |
| for(PropertyRestriction p : filter.getPropertyRestrictions(property)) { |
| if (p.isLike) { |
| continue; |
| } |
| if (p.first != null) { |
| if (p.first.isArray()) { |
| return null; |
| } |
| list.add(p.first.getValue(Type.STRING)); |
| first = true; |
| } |
| if (p.last != null) { |
| if (p.last.isArray()) { |
| return null; |
| } |
| list.add(p.last.getValue(Type.STRING)); |
| last = true; |
| } |
| } |
| if (!first || !last) { |
| return null; |
| } |
| String prefix = list.get(0); |
| for (String s : list) { |
| while (!s.startsWith(prefix)) { |
| prefix = prefix.substring(0, prefix.length() - 1); |
| if (prefix.isEmpty()) { |
| return null; |
| } |
| } |
| } |
| return prefix; |
| } |
| |
| @Nullable |
| public static Set<String> getAllValues(PropertyRestriction restriction){ |
| return getValues(restriction, ValuePattern.MATCH_ALL); |
| } |
| |
| @Nullable |
| public static Set<String> getValues(PropertyRestriction restriction, ValuePattern pattern) { |
| if (restriction.firstIncluding |
| && restriction.lastIncluding |
| && restriction.first != null |
| && restriction.first.equals(restriction.last)) { |
| // "[property] = $value" |
| return read(restriction.first, pattern); |
| } else if (restriction.list != null) { |
| // "[property] IN (...) |
| Set<String> values = newLinkedHashSet(); // keep order for testing |
| for (PropertyValue value : restriction.list) { |
| values.addAll(read(value, pattern)); |
| } |
| return values; |
| } else { |
| // "[property] is not null" or "[property] is null" |
| return null; |
| } |
| } |
| |
| @Nullable |
| public static Set<String> read(PropertyValue value, ValuePattern pattern) { |
| if (value == null) { |
| return null; |
| } |
| Set<String> values = new HashSet<String>(); |
| for (String v : value.getValue(Type.STRINGS)) { |
| if (!pattern.matches(v)) { |
| continue; |
| } |
| values.add(v); |
| } |
| return values; |
| } |
| } |