/*
* Copyright 2014, Tuplejump Inc.
*
* Licensed 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 com.tuplejump.stargate.lucene.query.function;
import org.codehaus.jackson.JsonGenerator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
/**
* User: satya
*/
public class Values implements Aggregate {
String field;
String alias;
Collection<Object> values;
public Values(AggregateFactory aggregateFactory, boolean distinct) {
this.field = aggregateFactory.getField();
this.alias = aggregateFactory.getAlias();
if (distinct) values = new HashSet<>();
else values = new ArrayList<>();
}
@Override
public void aggregate(Tuple tuple) {
values.add(tuple.getValue(field));
}
@Override
public void writeJson(JsonGenerator generator) throws IOException {
generator.writeStartObject();
generator.writeFieldName(alias);
generator.writeStartArray();
for (Object value : values) {
generator.writeString(value == null ? null : value.toString());
}
generator.writeEndArray();
generator.writeEndObject();
}
}