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Apache Solr (module: core)
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.solr.search.facet;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.apache.solr.common.util.CollectionUtil;
import org.apache.solr.common.util.SimpleOrderedMap;

public class FacetBucket {
  @SuppressWarnings("rawtypes")
  final FacetModule.FacetBucketMerger parent;

  @SuppressWarnings({"rawtypes"})
  final Comparable bucketValue;

  // this is just for internal correlation (the first bucket created is bucket 0,
  // the next bucket 1, across all field buckets)
  final int bucketNumber;

  long count;
  Map subs;

  public FacetBucket(
      @SuppressWarnings("rawtypes") FacetModule.FacetBucketMerger parent,
      @SuppressWarnings("rawtypes") Comparable bucketValue,
      FacetMerger.Context mcontext) {
    this.parent = parent;
    this.bucketValue = bucketValue;
    // TODO: we don't need bucket numbers for all buckets...
    this.bucketNumber = mcontext.getNewBucketNumber();
  }

  public long getCount() {
    return count;
  }

  /** returns the existing merger for the given key, or null if none yet exists */
  FacetMerger getExistingMerger(String key) {
    if (subs == null) return null;
    return subs.get(key);
  }

  private FacetMerger getMerger(String key, Object prototype) {
    FacetMerger merger = null;
    if (subs != null) {
      merger = subs.get(key);
      if (merger != null) return merger;
    }

    merger = parent.createFacetMerger(key, prototype);

    if (merger != null) {
      if (subs == null) {
        subs = new HashMap<>();
      }
      subs.put(key, merger);
    }

    return merger;
  }

  public void mergeBucket(SimpleOrderedMap bucket, FacetMerger.Context mcontext) {
    // todo: for refinements, we want to recurse, but not re-do stats for intermediate buckets

    mcontext.setShardFlag(bucketNumber);

    // drive merging off the received bucket?
    for (int i = 0; i < bucket.size(); i++) {
      String key = bucket.getName(i);
      Object val = bucket.getVal(i);
      if ("count".equals(key)) {
        count += ((Number) val).longValue();
        continue;
      }
      if ("val".equals(key)) {
        // this is taken care of at a higher level...
        continue;
      }

      FacetMerger merger = getMerger(key, val);

      if (merger != null) {
        merger.merge(val, mcontext);
      }
    }
  }

  public SimpleOrderedMap