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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.cluster.metadata;
import org.elasticsearch.common.collect.Tuple;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Encapsulates the {@link IndexMetaData} instances of a concrete index or indices an alias is pointing to.
*/
public interface AliasOrIndex {
/**
* @return whether this an alias or concrete index
*/
boolean isAlias();
/**
* @return All {@link IndexMetaData} of all concrete indices this alias is referring to or if this is a concrete index its {@link IndexMetaData}
*/
List<IndexMetaData> getIndices();
/**
* Represents an concrete index and encapsulates its {@link IndexMetaData}
*/
class Index implements AliasOrIndex {
private final IndexMetaData concreteIndex;
public Index(IndexMetaData indexMetaData) {
this.concreteIndex = indexMetaData;
}
@Override
public boolean isAlias() {
return false;
}
@Override
public List<IndexMetaData> getIndices() {
return Collections.singletonList(concreteIndex);
}
/**
* @return If this is an concrete index, its {@link IndexMetaData}
*/
public IndexMetaData getIndex() {
return concreteIndex;
}
}
/**
* Represents an alias and groups all {@link IndexMetaData} instances sharing the same alias name together.
*/
class Alias implements AliasOrIndex {
private final String aliasName;
private final List<IndexMetaData> referenceIndexMetaDatas;
public Alias(AliasMetaData aliasMetaData, IndexMetaData indexMetaData) {
this.aliasName = aliasMetaData.getAlias();
this.referenceIndexMetaDatas = new ArrayList<>();
this.referenceIndexMetaDatas.add(indexMetaData);
}
@Override
public boolean isAlias() {
return true;
}
@Override
public List<IndexMetaData> getIndices() {
return referenceIndexMetaDatas;
}
/**
* Returns the unique alias metadata per concrete index.
*
* (note that although alias can point to the same concrete indices, each alias reference may have its own routing
* and filters)
*/
public Iterable<Tuple<String, AliasMetaData>> getConcreteIndexAndAliasMetaDatas() {
return new Iterable<Tuple<String, AliasMetaData>>() {
@Override
public Iterator<Tuple<String, AliasMetaData>> iterator() {
return new Iterator<Tuple<String,AliasMetaData>>() {
int index = 0;
@Override
public boolean hasNext() {
return index < referenceIndexMetaDatas.size();
}
@Override
public Tuple<String, AliasMetaData> next() {
IndexMetaData indexMetaData = referenceIndexMetaDatas.get(index++);
return new Tuple<>(indexMetaData.getIndex(), indexMetaData.getAliases().get(aliasName));
}
@Override
public final void remove() {
throw new UnsupportedOperationException();
}
};
}
};
}
public AliasMetaData getFirstAliasMetaData() {
return referenceIndexMetaDatas.get(0).getAliases().get(aliasName);
}
void addIndex(IndexMetaData indexMetaData) {
this.referenceIndexMetaDatas.add(indexMetaData);
}
}
}
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