Package org.datanucleus.query.expression

Examples of org.datanucleus.query.expression.Expression

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  /**
   * Adds filters to the given {@link Query} by examining the compiled filter
   * expression.
   */
  private void addFilters(QueryData qd) {
    Expression filter = qd.compilation.getExprFilter();
    addExpression(filter, qd);
  }
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    }
  }

  private void handleMatchesOperation(InvokeExpression invocation, Expression expr,
                                      QueryData qd) {
    Expression param = (Expression) invocation.getArguments().get(0);
    if (expr.getLeft() instanceof PrimaryExpression && param instanceof Literal) {
      String matchesExpr = getPrefixFromMatchesExpression(((Literal) param).getLiteral());
      addPrefix((PrimaryExpression) expr.getLeft(), new Literal(matchesExpr), matchesExpr, qd);
    } else if (expr.getLeft() instanceof PrimaryExpression &&
               param instanceof ParameterExpression) {
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    return ".*";
  }

  private void addPrefix(PrimaryExpression left, Expression right, String prefix, QueryData qd) {
    addLeftPrimaryExpression(left, Expression.OP_GTEQ, right, qd);
    Expression param = getUpperLimitForStartsWithStr(prefix);
    addLeftPrimaryExpression(left, Expression.OP_LT, param, qd);
  }
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   * < filter for the method argument translated into an upper limit for the
   * scan.
   */
  private void handleStartsWithOperation(InvokeExpression invocation, Expression expr,
                                         QueryData qd) {
    Expression param = (Expression) invocation.getArguments().get(0);
    param.bind();
    if (expr.getLeft() instanceof PrimaryExpression && param instanceof Literal) {
      addPrefix((PrimaryExpression) expr.getLeft(), param, (String) ((Literal) param).getLiteral(), qd);
    } else if (expr.getLeft() instanceof PrimaryExpression &&
               param instanceof ParameterExpression) {
      Object parameterValue = getParameterValue(qd, (ParameterExpression) param);
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      throw newUnsupportedQueryMethodException(invocation);
    }
  }

  private void handleContainsOperation(InvokeExpression invocation, Expression expr, QueryData qd) {
    Expression param = (Expression) invocation.getArguments().get(0);
    param.bind();
    if (expr.getLeft() instanceof PrimaryExpression) {
      PrimaryExpression left = (PrimaryExpression) expr.getLeft();
      // treat contains as equality since that's how the low-level
      // api does checks on multi-value properties.
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     * @see org.datanucleus.query.evaluator.AbstractExpressionEvaluator#processPrimaryExpression(org.datanucleus.query.expression.PrimaryExpression)
     */
    @Override
    protected Object processPrimaryExpression(PrimaryExpression expr)
    {
        Expression left = expr.getLeft();
        if (left == null)
        {
            List<String> tuples = expr.getTuples();
            String fieldName = getFieldNameForPrimary(tuples);
            if (fieldName == null)
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                }
            }
        }

        List resultSet = new ArrayList(executeCandidates);
        Expression filter = compilation.getExprFilter();
        if (applyFilter && filter != null)
        {
            // Process any filter constraints
            if (NucleusLogger.QUERY.isDebugEnabled())
            {
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        return resultSet;
    }

    private List handleFilter(List set)
    {
        Expression filter = compilation.getExprFilter();
        if (filter == null)
        {
            return set;
        }
   
        List result = new ArrayList();
        Iterator it = set.iterator();
        while (it.hasNext())
        {
            // Set the value of the candidate being tested, and evaluate it
            Object obj = it.next();
            if (!state.containsKey(candidateAlias))
            {
                throw new NucleusUserException("Alias \"" + candidateAlias + "\" doesn't exist in the query or the candidate alias wasn't defined");
            }
            state.put(candidateAlias, obj);
            if (filter.evaluate(
                new InMemoryExpressionEvaluator(query.getObjectManager().getOMFContext().getQueryManager(),
                    parameterValues, state, query.getParsedImports(), clr, candidateAlias)) == Boolean.TRUE)
            {
                result.add(obj);
            }
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                }
            }
            group.add(resultSet.get(i));
        }
        List result = new ArrayList();
        Expression having = compilation.getExprHaving();
        if (having != null)
        {
            for (int i=0; i<groups.size(); i++)
            {
                if (satisfiesHavingClause((List) groups.get(i)))
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     */
    private boolean satisfiesHavingClause(List set)
    {
        state.put(RESULTS_SET, set);

        Expression having = compilation.getExprHaving();
        if (having.evaluate(evaluator) == Boolean.TRUE)
        {
            return true;
        }
        return false;
    }
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Related Classes of org.datanucleus.query.expression.Expression

  • com.google.appengine.datanucleus.query.DatastoreQuery
  • org.datanucleus.api.jpa.criteria.FromImpl
  • org.datanucleus.query.compiler.JavaQueryCompiler
  • org.datanucleus.query.compiler.JDOQLCompiler
  • org.datanucleus.query.compiler.JPQLCompiler
  • org.datanucleus.query.compiler.SQLCompiler
  • org.datanucleus.query.evaluator.JavaQueryEvaluator
  • org.datanucleus.query.evaluator.memory.InMemoryExpressionEvaluator
  • org.datanucleus.query.JDOQLQueryHelper
  • org.datanucleus.store.appengine.query.DatastoreQuery
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