/*
 * 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.lucene.spatial.util;

import org.locationtech.spatial4j.shape.Shape;

import java.util.ArrayList;
import java.util.List;

Bounded Cache of Shapes associated with docIds.  Note, multiple Shapes can be
associated with a given docId.

WARNING: This class holds the data in an extremely inefficient manner as all Points are in memory as objects and they
are stored in many ArrayLists (one per document).  So it works but doesn't scale.  It will be replaced in the future.
@lucene.internal
/**
 * Bounded Cache of Shapes associated with docIds.  Note, multiple Shapes can be
 * associated with a given docId.
 * <p>
 * WARNING: This class holds the data in an extremely inefficient manner as all Points are in memory as objects and they
 * are stored in many ArrayLists (one per document).  So it works but doesn't scale.  It will be replaced in the future.
 *
 * @lucene.internal
 */
public class ShapeFieldCache<T extends Shape> {
  private final List<T>[] cache;
  public final int defaultLength;

  @SuppressWarnings({"unchecked", "rawtypes"})
  public ShapeFieldCache( int length, int defaultLength ) {
    cache = new List[length];
    this.defaultLength= defaultLength;
  }

  public void add( int docid, T s ) {
    List<T> list = cache[docid];
    if( list == null ) {
      list = cache[docid] = new ArrayList<>(defaultLength);
    }
    list.add( s );
  }

  public List<T> getShapes( int docid ) {
    return cache[docid];
  }
}