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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.handler.component;

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

import org.apache.solr.common.params.ModifiableSolrParams;


// todo... when finalized make accessors
public class ShardRequest {
  public final static String[] ALL_SHARDS = null;

  public final static int PURPOSE_PRIVATE         = 0x01;
  public final static int PURPOSE_GET_TERM_DFS    = 0x02;
  public final static int PURPOSE_GET_TOP_IDS     = 0x04;
  public final static int PURPOSE_REFINE_TOP_IDS  = 0x08;
  public final static int PURPOSE_GET_FACETS      = 0x10;
  public final static int PURPOSE_REFINE_FACETS   = 0x20;
  public final static int PURPOSE_GET_FIELDS      = 0x40;
  public final static int PURPOSE_GET_HIGHLIGHTS  = 0x80;
  public final static int PURPOSE_GET_DEBUG       =0x100;
  public final static int PURPOSE_GET_STATS       =0x200;

  public int purpose;  // the purpose of this request

  public String[] shards;  // the shards this request should be sent to, null for all
// TODO: how to request a specific shard address?


  public ModifiableSolrParams params;


  /** list of responses... filled out by framework */
  public List responses = new ArrayList();

  /** actual shards to send the request to, filled out by framework */
  public String[] actualShards;

  // TODO: one could store a list of numbers to correlate where returned docs
  // go in the top-level response rather than looking up by id...
  // this would work well if we ever transitioned to using internal ids and
  // didn't require a uniqueId

  public String toString() {
    return "ShardRequest:{params=" + params
            + ", purpose=" + Integer.toHexString(purpose)
            + ", nResponses =" + responses.size()
            + "}";
  }
}