content: /*****************************************************************
   *   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
   *
   *    https://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.cayenne.query;
  
  import org.apache.cayenne.ejbql.EJBQLCompiledExpression;
  import org.apache.cayenne.map.EntityResolver;
  import org.apache.cayenne.map.ObjEntity;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  /**
   * A metadata object for the {@link EJBQLQuery}.
   * 
   * @since 3.0
   */
  class EJBQLQueryMetadata extends BaseQueryMetadata {
  
      boolean resolve(EntityResolver resolver, EJBQLQuery query) {
          EJBQLCompiledExpression expression = query.getExpression(resolver);
          setPrefetchTree(expression.getPrefetchTree());
          resultSetMapping = expression.getResult() != null
                  ? expression.getResult().getResolvedComponents(resolver)
                  : null;
  
          ObjEntity root = expression.getRootDescriptor().getEntity();
  
          if (!super.resolve(root, resolver)) {
              return false;
          }
  
          if (QueryCacheStrategy.NO_CACHE == getCacheStrategy()) {
              return true;
          }
  
          // create a unique key based on entity, EJBQL, and parameters
          StringBuilder key = new StringBuilder();
  
          if (query.getEjbqlStatement() != null) {
              key.append('/').append(query.getEjbqlStatement());
          }
  
          if (query.getFetchLimit() > 0) {
              key.append('/').append(query.getFetchLimit());
          }
  
          Map<String, Object> namedParameters = query.getNamedParameters();
          if (!namedParameters.isEmpty()) {
              List<String> keys = new ArrayList<>(namedParameters.keySet());
              Collections.sort(keys);
              for (String parameterKey : keys) {
                  key.append('/').append(parameterKey).append('=').append(
                          namedParameters.get(parameterKey));
              }
          }
  
          Map<Integer, Object> positionalParameters = query.getPositionalParameters();
          if (!positionalParameters.isEmpty()) {
              List<Integer> keys = new ArrayList<>(positionalParameters.keySet());
              Collections.sort(keys);
              for (Integer parameterKey : keys) {
                  key.append('/').append(parameterKey).append('=').append(
                          positionalParameters.get(parameterKey));
              }
          }
  
          if (query.getFetchOffset() > 0 || query.getFetchLimit() > 0) {
              key.append('/');
              if (query.getFetchOffset() > 0) {
                  key.append('o').append(query.getFetchOffset());
              }
              if (query.getFetchLimit() > 0) {
                  key.append('l').append(query.getFetchLimit());
              }
          }
  
          this.cacheKey = key.toString();
  
          return true;
      }
  }
  