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   *  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
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  package org.apache.cayenne.ejbql.parser;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.cayenne.ejbql.EJBQLCompiledExpression;
  import org.apache.cayenne.ejbql.EJBQLExpression;
  import org.apache.cayenne.map.DbRelationship;
  import org.apache.cayenne.map.ObjRelationship;
  import org.apache.cayenne.map.SQLResult;
  import org.apache.cayenne.query.PrefetchTreeNode;
  import org.apache.cayenne.reflect.ClassDescriptor;
  
  /**
   * A compiled EJBQL expression.
   * 
   * @since 3.0
   */
  class CompiledExpression implements EJBQLCompiledExpression {
  
      private String source;
      private String rootId;
      private Map<String, ClassDescriptor> descriptorsById;
      private Map<String, ObjRelationship> incomingById;
      private EJBQLExpression expression;
      private SQLResult result;
      private PrefetchTreeNode prefetchTree;
      
      
      public ClassDescriptor getEntityDescriptor(String idVariable) {
          if (idVariable == null) {
              return null;
          }
  
          return descriptorsById.get(Compiler.normalizeIdPath(idVariable));
      }
  
      public SQLResult getResult() {
          return result;
      }
  
      public ClassDescriptor getRootDescriptor() {
          return rootId != null ? getEntityDescriptor(rootId) : null;
      }
  
      public List<DbRelationship> getIncomingRelationships(String identifier) {
          ObjRelationship relationship = incomingById.get(identifier);
          if (relationship == null) {
              return Collections.emptyList();
          }
  
          return relationship.getDbRelationships();
      }
  
      public EJBQLExpression getExpression() {
          return expression;
      }
  
      public String getSource() {
          return source;
      }
  
      void setExpression(EJBQLExpression expression) {
          this.expression = expression;
      }
  
      void setDescriptorsById(Map<String, ClassDescriptor> descriptorsById) {
          this.descriptorsById = descriptorsById;
      }
  
      void setIncomingById(Map<String, ObjRelationship> incomingById) {
          this.incomingById = incomingById;
      }
  
      void setSource(String source) {
          this.source = source;
      }
  
      void setRootId(String rootId) {
          this.rootId = rootId;
      }
  
      void setResult(SQLResult resultSetMapping) {
          this.result = resultSetMapping;
      }
      
      public PrefetchTreeNode getPrefetchTree() {
          return prefetchTree;
      }
  
      public void setPrefetchTree(PrefetchTreeNode prefetchTree) {
          this.prefetchTree = prefetchTree;
      }
  }
  