private String createJPQLQuery()

in odata2-jpa-processor/jpa-core/src/main/java/org/apache/olingo/odata2/jpa/processor/core/jpql/JPQLJoinStatementBuilder.java [48:130]
70 lines of code
14 McCabe index (conditional complexity)

  private String createJPQLQuery() throws ODataJPARuntimeException {

    StringBuilder jpqlQuery = new StringBuilder();
    StringBuilder joinWhereCondition = null;

    jpqlQuery.append(JPQLStatement.KEYWORD.SELECT).append(JPQLStatement.DELIMITER.SPACE);
    if (context.getType().equals(JPQLContextType.JOIN_COUNT)) {// $COUNT
      jpqlQuery.append(JPQLStatement.KEYWORD.COUNT).append(JPQLStatement.DELIMITER.SPACE);
      jpqlQuery.append(JPQLStatement.DELIMITER.PARENTHESIS_LEFT).append(JPQLStatement.DELIMITER.SPACE);
      jpqlQuery.append(context.getSelectExpression()).append(JPQLStatement.DELIMITER.SPACE);
      jpqlQuery.append(JPQLStatement.DELIMITER.PARENTHESIS_RIGHT).append(JPQLStatement.DELIMITER.SPACE);
    } else { // Normal
      jpqlQuery.append(context.getSelectExpression()).append(JPQLStatement.DELIMITER.SPACE);
    }

    jpqlQuery.append(JPQLStatement.KEYWORD.FROM).append(JPQLStatement.DELIMITER.SPACE);

    if (context.getJPAJoinClauses() != null && !context.getJPAJoinClauses().isEmpty()) {
      List<JPAJoinClause> joinClauseList = context.getJPAJoinClauses();
      JPAJoinClause joinClause = joinClauseList.get(0);
      String joinCondition = joinClause.getJoinCondition();
      joinWhereCondition = new StringBuilder();
      if (joinCondition != null) {
        joinWhereCondition.append(joinCondition);
      }
      String relationShipAlias = null;
      joinClause = joinClauseList.get(1);
      jpqlQuery.append(joinClause.getEntityName()).append(JPQLStatement.DELIMITER.SPACE);
      jpqlQuery.append(joinClause.getEntityAlias());

      int i = 1;
      int limit = joinClauseList.size();
      relationShipAlias = joinClause.getEntityAlias();
      while (i < limit) {
        jpqlQuery.append(JPQLStatement.DELIMITER.SPACE);
        jpqlQuery.append(JPQLStatement.KEYWORD.JOIN).append(JPQLStatement.DELIMITER.SPACE);

        joinClause = joinClauseList.get(i);
        jpqlQuery.append(relationShipAlias).append(JPQLStatement.DELIMITER.PERIOD);
        jpqlQuery.append(joinClause.getEntityRelationShip()).append(JPQLStatement.DELIMITER.SPACE);
        jpqlQuery.append(joinClause.getEntityRelationShipAlias());

        relationShipAlias = joinClause.getEntityRelationShipAlias();
        i++;

        joinCondition = joinClause.getJoinCondition();
        if (joinCondition != null) {
          joinWhereCondition.append(JPQLStatement.DELIMITER.SPACE + JPQLStatement.Operator.AND
              + JPQLStatement.DELIMITER.SPACE);

          joinWhereCondition.append(joinCondition);
        }
      }
    } else {
      throw ODataJPARuntimeException.throwException(ODataJPARuntimeException.JOIN_CLAUSE_EXPECTED, null);
    }
    String whereExpression = context.getWhereExpression();
    if (whereExpression != null || joinWhereCondition.length() > 0) {
      jpqlQuery.append(JPQLStatement.DELIMITER.SPACE).append(JPQLStatement.KEYWORD.WHERE).append(
          JPQLStatement.DELIMITER.SPACE);
      if (whereExpression != null) {
        jpqlQuery.append(whereExpression);
        if (joinWhereCondition != null) {
          jpqlQuery.append(JPQLStatement.DELIMITER.SPACE + JPQLStatement.Operator.AND + JPQLStatement.DELIMITER.SPACE);
        }
      }
      if (joinWhereCondition != null) {
        jpqlQuery.append(joinWhereCondition.toString());
      }

    }

    if (context.getOrderByCollection() != null && context.getOrderByCollection().length() > 0) {

      StringBuilder orderByBuilder = new StringBuilder();
      orderByBuilder.append(context.getOrderByCollection());
      jpqlQuery.append(JPQLStatement.DELIMITER.SPACE).append(JPQLStatement.KEYWORD.ORDERBY).append(
          JPQLStatement.DELIMITER.SPACE);
      jpqlQuery.append(orderByBuilder);
    }

    return jpqlQuery.toString();
  }