org.elasticsearch.search.facet.InternalFacet Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.search.facet;
import com.google.common.collect.ImmutableMap;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.common.xcontent.ToXContent;
import java.io.IOException;
import java.util.List;
/**
*
*/
public abstract class InternalFacet implements Facet, Streamable, ToXContent {
private String facetName;
/**
* Here just for streams...
*/
protected InternalFacet() {
}
protected InternalFacet(String facetName) {
this.facetName = facetName;
}
public abstract BytesReference streamType();
public abstract Facet reduce(List facets);
public static interface Stream {
Facet readFacet(StreamInput in) throws IOException;
}
public static class Streams {
private static ImmutableMap streams = ImmutableMap.of();
public static synchronized void registerStream(Stream stream, BytesReference... types) {
MapBuilder uStreams = MapBuilder.newMapBuilder(streams);
for (BytesReference type : types) {
uStreams.put(type, stream);
}
streams = uStreams.immutableMap();
}
public static Stream stream(BytesReference type) {
return streams.get(type);
}
}
@Override
public final String getName() {
return facetName;
}
@Override
public void readFrom(StreamInput in) throws IOException {
facetName = in.readString();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeString(facetName);
}
}