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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.document.Field;
import org.apache.lucene.document.SortedDocValuesField;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexableField;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.lucene.Lucene;
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.Mapper;
import org.elasticsearch.index.mapper.ParseContext;
import org.elasticsearch.index.mapper.StringFieldType;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Set;
/**
* A field mapper used internally by the {@link ParentJoinFieldMapper} to index
* the value that link documents in the index (parent _id or _id if the document is a parent).
*/
public final class ParentIdFieldMapper extends FieldMapper {
static final String CONTENT_TYPE = "parent";
static class Defaults {
public static final MappedFieldType FIELD_TYPE = new ParentIdFieldType();
static {
FIELD_TYPE.setTokenized(false);
FIELD_TYPE.setOmitNorms(true);
FIELD_TYPE.setHasDocValues(true);
FIELD_TYPE.setIndexOptions(IndexOptions.DOCS);
FIELD_TYPE.freeze();
}
}
static class Builder extends FieldMapper.Builder<Builder, ParentIdFieldMapper> {
private final String parent;
private final Set<String> children;
Builder(String name, String parent, Set<String> children) {
super(name, Defaults.FIELD_TYPE, Defaults.FIELD_TYPE);
builder = this;
this.parent = parent;
this.children = children;
}
public Set<String> getChildren() {
return children;
}
public Builder eagerGlobalOrdinals(boolean eagerGlobalOrdinals) {
fieldType().setEagerGlobalOrdinals(eagerGlobalOrdinals);
return builder;
}
@Override
public ParentIdFieldMapper build(BuilderContext context) {
fieldType.setName(name);
return new ParentIdFieldMapper(name, parent, children, fieldType, context.indexSettings());
}
}
public static final class ParentIdFieldType extends StringFieldType {
public ParentIdFieldType() {
setIndexAnalyzer(Lucene.KEYWORD_ANALYZER);
setSearchAnalyzer(Lucene.KEYWORD_ANALYZER);
}
protected ParentIdFieldType(ParentIdFieldType ref) {
super(ref);
}
public ParentIdFieldType clone() {
return new ParentIdFieldType(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();
}
}
private final String parentName;
private Set<String> children;
protected ParentIdFieldMapper(String simpleName,
String parentName,
Set<String> children,
MappedFieldType fieldType,
Settings indexSettings) {
super(simpleName, fieldType, Defaults.FIELD_TYPE, indexSettings, MultiFields.empty(), null);
this.parentName = parentName;
this.children = children;
}
@Override
protected ParentIdFieldMapper clone() {
return (ParentIdFieldMapper) super.clone();
}
/**
* Returns the parent name associated with this mapper.
*/
public String getParentName() {
return parentName;
}
/**
* Returns the children names associated with this mapper.
*/
public Collection<String> getChildren() {
return children;
}
@Override
protected void parseCreateField(ParseContext context, List<IndexableField> fields) throws IOException {
if (context.externalValueSet() == false) {
throw new IllegalStateException("external value not set");
}
String refId = (String) context.externalValue();
BytesRef binaryValue = new BytesRef(refId);
Field field = new Field(fieldType().name(), binaryValue, fieldType());
fields.add(field);
fields.add(new SortedDocValuesField(fieldType().name(), binaryValue));
}
@Override
protected void doMerge(Mapper mergeWith, boolean updateAllTypes) {
super.doMerge(mergeWith, updateAllTypes);
ParentIdFieldMapper parentMergeWith = (ParentIdFieldMapper) mergeWith;
this.children = parentMergeWith.children;
}
@Override
protected String contentType() {
return CONTENT_TYPE;
}
}
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