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FieldMappersLookup.java
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FieldMappersLookup.java
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/*
* 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 com.google.common.collect.Sets;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.CopyOnWriteHashMap;
import org.elasticsearch.common.regex.Regex;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Set;
/**
* A class that holds a map of field mappers from name, index name, and full name.
*/
class FieldMappersLookup implements Iterable<FieldMapper> {
/** Full field name to mappers */
private final CopyOnWriteHashMap<String, FieldMappers> mappers;
/** Create a new empty instance. */
public FieldMappersLookup() {
mappers = new CopyOnWriteHashMap<>();
}
private FieldMappersLookup(CopyOnWriteHashMap<String, FieldMappers> map) {
mappers = map;
}
/**
* Return a new instance that contains the union of this instance and the provided mappers.
*/
public FieldMappersLookup copyAndAddAll(Collection<FieldMapper> newMappers) {
CopyOnWriteHashMap<String, FieldMappers> map = this.mappers;
for (FieldMapper mapper : newMappers) {
String key = mapper.names().fullName();
FieldMappers mappers = map.get(key);
if (mappers == null) {
mappers = new FieldMappers(mapper);
} else {
mappers = mappers.concat(mapper);
}
map = map.copyAndPut(key, mappers);
}
return new FieldMappersLookup(map);
}
/**
* Returns the field mappers based on the mapper index name.
* NOTE: this only exists for backcompat support and if the index name
* does not match it's field name, this is a linear time operation
* @deprecated Use {@link #get(String)}
*/
@Deprecated
public FieldMappers indexName(String indexName) {
FieldMappers fieldMappers = fullName(indexName);
if (fieldMappers != null) {
if (fieldMappers.mapper().names().indexName().equals(indexName)) {
return fieldMappers;
}
}
fieldMappers = new FieldMappers();
for (FieldMapper mapper : this) {
if (mapper.names().indexName().equals(indexName)) {
fieldMappers = fieldMappers.concat(mapper);
}
}
if (fieldMappers.isEmpty()) {
return null;
}
return fieldMappers;
}
/**
* Returns the field mappers based on the mapper full name.
*/
public FieldMappers fullName(String fullName) {
return mappers.get(fullName);
}
/** Returns the mapper for the given field */
public FieldMapper get(String field) {
FieldMappers fieldMappers = mappers.get(field);
if (fieldMappers == null) {
return null;
}
if (fieldMappers.mappers().size() != 1) {
throw new IllegalStateException("Mapper for field [" + field + "] should be unique");
}
return fieldMappers.mapper();
}
/**
* Returns a list of the index names of a simple match regex like pattern against full name and index name.
*/
public Collection<String> simpleMatchToIndexNames(String pattern) {
Set<String> fields = Sets.newHashSet();
for (FieldMapper fieldMapper : this) {
if (Regex.simpleMatch(pattern, fieldMapper.names().fullName())) {
fields.add(fieldMapper.names().indexName());
} else if (Regex.simpleMatch(pattern, fieldMapper.names().indexName())) {
fields.add(fieldMapper.names().indexName());
}
}
return fields;
}
/**
* 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 = Sets.newHashSet();
for (FieldMapper fieldMapper : this) {
if (Regex.simpleMatch(pattern, fieldMapper.names().fullName())) {
fields.add(fieldMapper.names().fullName());
} else if (Regex.simpleMatch(pattern, fieldMapper.names().indexName())) {
fields.add(fieldMapper.names().fullName());
}
}
return fields;
}
/**
* Tries to find first based on {@link #fullName(String)}, then by {@link #indexName(String)}.
*/
@Nullable
FieldMappers smartName(String name) {
FieldMappers fieldMappers = fullName(name);
if (fieldMappers != null) {
return fieldMappers;
}
return indexName(name);
}
/**
* Tries to find first based on {@link #fullName(String)}, then by {@link #indexName(String)}
* and return the first mapper for it (see {@link org.elasticsearch.index.mapper.FieldMappers#mapper()}).
*/
@Nullable
public FieldMapper smartNameFieldMapper(String name) {
FieldMappers fieldMappers = smartName(name);
if (fieldMappers == null) {
return null;
}
return fieldMappers.mapper();
}
public Iterator<FieldMapper> iterator() {
final Iterator<FieldMappers> fieldsItr = mappers.values().iterator();
if (fieldsItr.hasNext() == false) {
return Collections.emptyIterator();
}
return new Iterator<FieldMapper>() {
Iterator<FieldMapper> fieldValuesItr = fieldsItr.next().iterator();
@Override
public boolean hasNext() {
return fieldsItr.hasNext() || fieldValuesItr.hasNext();
}
@Override
public FieldMapper next() {
if (fieldValuesItr.hasNext() == false && fieldsItr.hasNext()) {
fieldValuesItr = fieldsItr.next().iterator();
}
return fieldValuesItr.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException("cannot remove field mapper from lookup");
}
};
}
}