コード例 #1
0
  /**
   * @return an empty String if there is no join clause, in other cases a String like the following
   *     is returned " as e left join e.bank as alias_1"
   */
  public String getJoinClause() {
    if (joinClause != null) {
      return joinClause;
    }

    // make sure that the join clauses are computed
    getWhereClause();
    getOrderByClause();

    if (getMainAlias() == null) {
      return "";
    }
    final StringBuilder sb = new StringBuilder();
    sb.append(" as " + getMainAlias() + " ");
    for (JoinDefinition joinDefinition : joinDefinitions) {
      sb.append(joinDefinition.getJoinStatement());
    }
    sb.append(" ");
    joinClause = sb.toString();
    return joinClause;
  }
コード例 #2
0
  // Resolves the list of properties against existing join definitions
  // creates new join definitions when necessary
  private String resolveJoins(List<Property> props, String originalPath) {
    String alias = getMainAlias();
    if (alias == null) {
      return originalPath;
    }
    int index = 0;
    int joinedPropertyIndex = -1;
    for (Property prop : props) {
      boolean found = false;
      for (JoinDefinition joinDefinition : joinDefinitions) {
        if (joinDefinition.appliesTo(alias, prop)) {
          alias = joinDefinition.getJoinAlias();
          joinedPropertyIndex = index;
          found = true;
          break;
        }
      }
      if (!found) {
        // no more joins, leave
        break;
      }
      index++;
    }
    // check if any new JoinDefinitions should be created
    for (int i = (joinedPropertyIndex + 1); i < props.size(); i++) {
      final Property prop = props.get(i);
      if (prop.isPrimitive()) {
        break;
      }
      // a joinable property
      final JoinDefinition joinDefinition = new JoinDefinition();
      joinDefinition.setOwnerAlias(alias);
      joinDefinition.setJoinAlias(getNewUniqueAlias());
      joinDefinition.setProperty(prop);
      joinDefinitions.add(joinDefinition);

      // move the result up to use the new JoinDefinition
      alias = joinDefinition.getJoinAlias();
      joinedPropertyIndex = i;
    }
    if (joinedPropertyIndex == (props.size() - 1)) {
      return alias;
    }
    return alias + "." + props.get(props.size() - 1).getName();
  }