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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.join.mapper;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexableField;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.plain.DocValuesIndexFieldData;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.ParseContext;
import org.elasticsearch.index.mapper.StringFieldType;
import java.io.IOException;
import java.util.List;
/**
* Simple field mapper hack to ensure that there is a one and only {@link ParentJoinFieldMapper} per mapping.
* This field mapper is not used to index or query any data, it is used as a marker in the mapping that
* denotes the presence of a parent-join field and forbids the addition of any additional ones.
* This class is also used to quickly retrieve the parent-join field defined in a mapping without
* specifying the name of the field.
*/
class MetaJoinFieldMapper extends FieldMapper {
static final String NAME = "_parent_join";
static final String CONTENT_TYPE = "parent_join";
static class Defaults {
public static final MappedFieldType FIELD_TYPE = new MetaJoinFieldType();
static {
FIELD_TYPE.setStored(false);
FIELD_TYPE.setHasDocValues(false);
FIELD_TYPE.setIndexOptions(IndexOptions.NONE);
FIELD_TYPE.freeze();
}
}
static class Builder extends FieldMapper.Builder<Builder, MetaJoinFieldMapper> {
Builder() {
super(NAME, Defaults.FIELD_TYPE, Defaults.FIELD_TYPE);
builder = this;
}
@Override
public MetaJoinFieldMapper build(BuilderContext context) {
fieldType.setName(NAME);
return new MetaJoinFieldMapper(name, fieldType, context.indexSettings());
}
}
static final class MetaJoinFieldType extends StringFieldType {
ParentJoinFieldMapper mapper;
MetaJoinFieldType() {}
protected MetaJoinFieldType(MetaJoinFieldType ref) {
super(ref);
}
public MetaJoinFieldType clone() {
return new MetaJoinFieldType(this);
}
@Override
public String typeName() {
return CONTENT_TYPE;
}
@Override
public IndexFieldData.Builder fielddataBuilder() {
failIfNoDocValues();
return new DocValuesIndexFieldData.Builder();
}
@Override
public Object valueForDisplay(Object value) {
if (value == null) {
return null;
}
BytesRef binaryValue = (BytesRef) value;
return binaryValue.utf8ToString();
}
}
MetaJoinFieldMapper(String name, MappedFieldType fieldType, Settings indexSettings) {
super(name, fieldType, ParentIdFieldMapper.Defaults.FIELD_TYPE, indexSettings, MultiFields.empty(), null);
}
void setFieldMapper(ParentJoinFieldMapper mapper) {
fieldType().mapper = mapper;
}
@Override
public MetaJoinFieldType fieldType() {
return (MetaJoinFieldType) super.fieldType();
}
@Override
protected MetaJoinFieldMapper clone() {
return (MetaJoinFieldMapper) super.clone();
}
@Override
protected void parseCreateField(ParseContext context, List<IndexableField> fields) throws IOException {
throw new IllegalStateException("Should never be called");
}
@Override
protected String contentType() {
return CONTENT_TYPE;
}
}
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