java/src/main/com/google/appengine/api/datastore/MultiQueryComponent.java

   1 // Copyright 2009 Google Inc. All Rights Reserved.
   2 package com.google.appengine.api.datastore;
   3
   4 import com.google.appengine.api.datastore.Query.FilterPredicate;
   5
   6 import java.util.ArrayList;
   7 import java.util.Arrays;
   8 import java.util.List;
   9
  10 /**
  11  * This class determines the manner in which multiple queries are generated.
  12  *
  13  * @see MultiQueryBuilder
  14  */
  15 class MultiQueryComponent implements Comparable<MultiQueryComponent>{
  16   public enum Order {SERIAL, PARALLEL}
  17
  18   private final Order order;
  19   private final List<List<FilterPredicate>> filters;
  20
  21   public MultiQueryComponent(Order order) {
  22     this.order = order;
  23     this.filters = new ArrayList<List<FilterPredicate>>();
  24   }
  25
  26   public MultiQueryComponent(Order order, List<List<FilterPredicate>> filters) {
  27     this.order = order;
  28     this.filters = filters;
  29   }
  30
  31   public Order getOrder() {
  32     return order;
  33   }
  34
  35   /**
  36    * Adds a set of filters that are then applied to {@link Query}s generated
  37    * by {@link MultiQueryBuilder} (in order).
  38    * @param filters
  39    */
  40   public void addFilters(FilterPredicate... filters) {
  41     this.filters.add(Arrays.asList(filters));
  42   }
  43
  44   public List<List<FilterPredicate>> getFilters() {
  45     return filters;
  46   }
  47
  48   @Override
  49   public int compareTo(MultiQueryComponent o) {
  50     return order.compareTo(o.order);
  51   }
  52
  53   @Override
  54   public String toString() {
  55     return "MultiQueryComponent [filters=" + filters + ", order=" + order + "]";
  56   }
  57 }