/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.mapper;
import org.elasticsearch.common.collect.CopyOnWriteHashMap;
import org.elasticsearch.common.regex.Regex;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;
/**
* An immutable container for looking up {@link MappedFieldType}s by their name.
*/
class FieldTypeLookup implements Iterable<MappedFieldType> {
/** Full field name to field type */
final CopyOnWriteHashMap<String, MappedFieldType> fullNameToFieldType;
/** Full field name to types containing a mapping for this full name. */
final CopyOnWriteHashMap<String, Set<String>> fullNameToTypes;
/** Create a new empty instance. */
FieldTypeLookup() {
fullNameToFieldType = new CopyOnWriteHashMap<>();
fullNameToTypes = new CopyOnWriteHashMap<>();
}
private FieldTypeLookup(
CopyOnWriteHashMap<String, MappedFieldType> fullName,
CopyOnWriteHashMap<String, Set<String>> fullNameToTypes) {
this.fullNameToFieldType = fullName;
this.fullNameToTypes = fullNameToTypes;
}
private static CopyOnWriteHashMap<String, Set<String>> addType(CopyOnWriteHashMap<String, Set<String>> map, String key, String type) {
Set<String> types = map.get(key);
if (types == null) {
return map.copyAndPut(key, Collections.singleton(type));
} else if (types.contains(type)) {
// noting to do
return map;
} else {
Set<String> newTypes = new HashSet<>(types.size() + 1);
newTypes.addAll(types);
newTypes.add(type);
assert newTypes.size() == types.size() + 1;
newTypes = Collections.unmodifiableSet(newTypes);
return map.copyAndPut(key, newTypes);
}
}
/**
* Return a new instance that contains the union of this instance and the field types
* from the provided fields. If a field already exists, the field type will be updated
* to use the new mappers field type.
*/
public FieldTypeLookup copyAndAddAll(String type, Collection<FieldMapper> fieldMappers, boolean updateAllTypes) {
Objects.requireNonNull(type, "type must not be null");
if (MapperService.DEFAULT_MAPPING.equals(type)) {
throw new IllegalArgumentException("Default mappings should not be added to the lookup");
}
CopyOnWriteHashMap<String, MappedFieldType> fullName = this.fullNameToFieldType;
CopyOnWriteHashMap<String, Set<String>> fullNameToTypes = this.fullNameToTypes;
for (FieldMapper fieldMapper : fieldMappers) {
MappedFieldType fieldType = fieldMapper.fieldType();
MappedFieldType fullNameFieldType = fullName.get(fieldType.name());
// is the update even legal?
checkCompatibility(type, fieldMapper, updateAllTypes);
if (fieldType.equals(fullNameFieldType) == false) {
fullName = fullName.copyAndPut(fieldType.name(), fieldMapper.fieldType());
}
fullNameToTypes = addType(fullNameToTypes, fieldType.name(), type);
}
return new FieldTypeLookup(fullName, fullNameToTypes);
}
private static boolean beStrict(String type, Set<String> types, boolean updateAllTypes) {
assert types.size() >= 1;
if (updateAllTypes) {
return false;
} else if (types.size() == 1 && types.contains(type)) {
// we are implicitly updating all types
return false;
} else {
return true;
}
}
/**
* Checks if the given field type is compatible with an existing field type.
* An IllegalArgumentException is thrown in case of incompatibility.
* If updateAllTypes is true, only basic compatibility is checked.
*/
private void checkCompatibility(String type, FieldMapper fieldMapper, boolean updateAllTypes) {
MappedFieldType fieldType = fullNameToFieldType.get(fieldMapper.fieldType().name());
if (fieldType != null) {
List<String> conflicts = new ArrayList<>();
final Set<String> types = fullNameToTypes.get(fieldMapper.fieldType().name());
boolean strict = beStrict(type, types, updateAllTypes);
fieldType.checkCompatibility(fieldMapper.fieldType(), conflicts, strict);
if (conflicts.isEmpty() == false) {
throw new IllegalArgumentException("Mapper for [" + fieldMapper.fieldType().name() + "] conflicts with existing mapping in other types:\n" + conflicts.toString());
}
}
}
/** Returns the field for the given field */
public MappedFieldType get(String field) {
return fullNameToFieldType.get(field);
}
/** Get the set of types that have a mapping for the given field. */
public Set<String> getTypes(String field) {
Set<String> types = fullNameToTypes.get(field);
if (types == null) {
types = Collections.emptySet();
}
return types;
}
/**
* Returns a list of the full names of a simple match regex like pattern against full name and index name.
*/
public Collection<String> simpleMatchToFullName(String pattern) {
Set<String> fields = new HashSet<>();
for (MappedFieldType fieldType : this) {
if (Regex.simpleMatch(pattern, fieldType.name())) {
fields.add(fieldType.name());
}
}
return fields;
}
@Override
public Iterator<MappedFieldType> iterator() {
return fullNameToFieldType.values().iterator();
}
}