Example usage for javax.persistence.criteria Expression as

Introduction

In this page you can find the example usage for javax.persistence.criteria Expression as.

Prototype

<X> Expression<X> as(Class<X> type);

Source Link

Document

Perform a typecast upon the expression, returning a new expression object.

Usage

From source file:ca.uhn.fhir.jpa.dao.SearchBuilder.java

private Predicate createPredicateNumeric(CriteriaBuilder builder, IQueryParameterType params,
        ParamPrefixEnum cmpValue, BigDecimal valueValue, final Expression<BigDecimal> path,
        String invalidMessageName, String theValueString) {
    Predicate num;/*from   ww w.ja v  a  2s  . c  om*/
    switch (cmpValue) {
    case GREATERTHAN:
        num = builder.gt(path, valueValue);
        break;
    case GREATERTHAN_OR_EQUALS:
        num = builder.ge(path, valueValue);
        break;
    case LESSTHAN:
        num = builder.lt(path, valueValue);
        break;
    case LESSTHAN_OR_EQUALS:
        num = builder.le(path, valueValue);
        break;
    case APPROXIMATE:
    case EQUAL:
    case NOT_EQUAL:
        BigDecimal mul = calculateFuzzAmount(cmpValue, valueValue);
        BigDecimal low = valueValue.subtract(mul, MathContext.DECIMAL64);
        BigDecimal high = valueValue.add(mul, MathContext.DECIMAL64);
        Predicate lowPred;
        Predicate highPred;
        if (cmpValue != ParamPrefixEnum.NOT_EQUAL) {
            lowPred = builder.ge(path.as(BigDecimal.class), low);
            highPred = builder.le(path.as(BigDecimal.class), high);
            num = builder.and(lowPred, highPred);
            ourLog.trace("Searching for {} <= val <= {}", low, high);
        } else {
            // Prefix was "ne", so reverse it!
            lowPred = builder.lt(path.as(BigDecimal.class), low);
            highPred = builder.gt(path.as(BigDecimal.class), high);
            num = builder.or(lowPred, highPred);
        }
        break;
    default:
        String msg = myContext.getLocalizer().getMessage(SearchBuilder.class, invalidMessageName,
                cmpValue.getValue(), params.getValueAsQueryToken(myContext));
        throw new InvalidRequestException(msg);
    }
    return num;
}

---