/*
* 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.fielddata.plain;
import org.apache.lucene.index.FilteredTermsEnum;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.index.mapper.Uid;
import java.io.IOException;
import java.util.NavigableSet;
/**
* Only emits terms that exist in the parentTypes set.
*
* @elasticsearch.internal
*/
final class ParentChildFilteredTermsEnum extends FilteredTermsEnum {
private final NavigableSet<BytesRef> parentTypes;
private BytesRef seekTerm;
private String type;
private BytesRef id;
ParentChildFilteredTermsEnum(TermsEnum tenum, NavigableSet<BytesRef> parentTypes) {
super(tenum, true);
this.parentTypes = parentTypes;
this.seekTerm = parentTypes.isEmpty() ? null : parentTypes.first();
}
@Override
protected BytesRef nextSeekTerm(BytesRef currentTerm) throws IOException {
BytesRef temp = seekTerm;
seekTerm = null;
return temp;
}
@Override
protected AcceptStatus accept(BytesRef term) throws IOException {
if (parentTypes.isEmpty()) {
return AcceptStatus.END;
}
BytesRef[] typeAndId = Uid.splitUidIntoTypeAndId(term);
if (parentTypes.contains(typeAndId[0])) {
type = typeAndId[0].utf8ToString();
id = typeAndId[1];
return AcceptStatus.YES;
} else {
BytesRef nextType = parentTypes.ceiling(typeAndId[0]);
if (nextType == null) {
return AcceptStatus.END;
}
seekTerm = nextType;
return AcceptStatus.NO_AND_SEEK;
}
}
public String type() {
return type;
}
public BytesRef id() {
return id;
}
}