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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
   * <p/>
   * https://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
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  package org.apache.cayenne.query;
  
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.map.EntityResolver;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  public abstract class AbstractMappedQuery extends IndirectQuery {
  
      protected String queryName;
      protected Map<String, Object> params;
  
      protected AbstractMappedQuery(String queryName) {
          this.queryName = queryName;
      }
  
      public AbstractMappedQuery name(String queryName) {
          this.queryName = queryName;
          return this;
      }
  
      protected AbstractMappedQuery params(Map<String, ?> parameters) {
          if (this.params == null) {
              this.params = new HashMap<>(parameters);
          } else {
              this.params.putAll(parameters);
          }
  
          this.replacementQuery = null;
  
          return this;
      }
  
      public AbstractMappedQuery param(String name, Object value) {
          if (this.params == null) {
              this.params = new HashMap<>();
          }
  
          this.params.put(name, value);
  
          this.replacementQuery = null;
  
          return this;
      }
  
      /**
       * Returns a non-null parameter map, substituting all persistent objects in the
       * initial map with ObjectIds. This is needed so that a query could work uniformly on
       * the server and client sides.
       */
      Map<String, ?> normalizedParameters() {
          if (params == null || params.isEmpty()) {
              return Collections.emptyMap();
          }
  
          Map<String, Object> substitutes = new HashMap<>(params);
  
          for (Map.Entry<String, Object> entry : params.entrySet()) {
              Object value = entry.getValue();
  
              if (value instanceof Persistent) {
                  value = ((Persistent) value).getObjectId();
              }
  
              substitutes.put(entry.getKey(), value);
          }
  
          return substitutes;
      }
  
      @Override
      protected Query createReplacementQuery(EntityResolver resolver) {
          Query query = resolver.getQueryDescriptor(queryName).buildQuery();
  
          if (query instanceof ParameterizedQuery) {
              query = ((ParameterizedQuery) query).createQuery(normalizedParameters());
          } else if (query instanceof EJBQLQuery) {
              for (Map.Entry<String, ?> entry : normalizedParameters().entrySet()) {
                  ((EJBQLQuery) query).setParameter(entry.getKey(), entry.getValue());
              }
          }
  
          return query;
      }
  }
  