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  package org.apache.cayenne.query;
  
  import org.apache.cayenne.map.EntityResolver;
  import org.apache.cayenne.map.Procedure;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  class ProcedureQueryMetadata extends BaseQueryMetadata {
  
      transient Procedure procedure;
  
      @Override
      public Procedure getProcedure() {
          return procedure;
      }
  
      @Override
      void copyFromInfo(QueryMetadata info) {
          procedure = null;
          super.copyFromInfo(info);
      }
  
      void resolve(
              Object root,
              Object resultRoot,
              EntityResolver resolver,
              ProcedureQuery query) {
          if (super.resolve(resultRoot, resolver)) {
              procedure = null;
  
              if (root != null) {
                  if (root instanceof String) {
                      this.procedure = resolver.getProcedure((String) root);
                  }
                  else if (root instanceof Procedure) {
                      this.procedure = (Procedure) root;
                  }
  
                  // theoretically procedure can be in one DataMap, while the Java Class
                  // - in another.
                  if (this.procedure != null && this.dataMap == null) {
                      this.dataMap = procedure.getDataMap();
                  }
              }
  
              // generate unique cache key...
              if (QueryCacheStrategy.NO_CACHE == getCacheStrategy()) {
  
              }
              else {
  
                  // create a unique key based on procedure and parameters
  
                  StringBuilder key = new StringBuilder("proc:");
                  if (procedure != null) {
                      key.append(procedure.getName());
                  }
  
                  Map<String, ?> parameters = query.getParameters();
                  if (!parameters.isEmpty()) {
  
                      List<String> keys = new ArrayList<>(parameters.keySet());
                      Collections.sort(keys);
  
                      for(String parameterKey : keys) {
                          key.append('/').append(parameterKey).append('=').append(
                                  parameters.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();
              }
  
          }
      }
  }
  