Java tutorial
/* * Copyright 2014 Attribyte, LLC * * 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.attribyte.essem.es; import com.fasterxml.jackson.core.JsonGenerator; import com.google.common.collect.ImmutableList; import java.io.IOException; import java.util.List; public class HistogramAggregation extends QueryComponent implements BucketAggregation { /** * The 'histogram' type. */ public static final String type = "histogram"; public HistogramAggregation(final String name, final String field, final int interval) { this.name = name; this.field = field; this.interval = interval; this.subs = ImmutableList.of(); } public HistogramAggregation(final String name, final String field, final int interval, final List<Aggregation> subs) { this.name = name; this.field = field; this.interval = interval; this.subs = subs == null ? ImmutableList.<Aggregation>of() : ImmutableList.copyOf(subs); } @Override public void generate(final JsonGenerator generator) throws IOException { generator.writeObjectFieldStart(name); { generator.writeObjectFieldStart(type); { generator.writeStringField("field", field); generator.writeNumberField("interval", interval); } generator.writeEndObject(); if (subs != null && subs.size() > 0) { generator.writeObjectFieldStart(AGGREGATION_OBJECT_NAME); for (Aggregation sub : subs) { sub.generate(generator); } generator.writeEndObject(); } } generator.writeEndObject(); } public final String name; public final String field; public final long interval; public final ImmutableList<Aggregation> subs; }