Examples with ScalarTargetResolvingExpressionVisitor com.blazebit.persistence.view.impl.ScalarTargetResolvingExpressionVisitor used on opensource projects

Example 6 with ScalarTargetResolvingExpressionVisitor

use of com.blazebit.persistence.view.impl.ScalarTargetResolvingExpressionVisitor in project blaze-persistence by Blazebit.

the class ViewTypeObjectBuilderTemplate method getCorrelationBasisType.

private Class<?> getCorrelationBasisType(Expression correlationBasisExpression, String correlationBasis, Map<String, javax.persistence.metamodel.Type<?>> rootTypes) {
    if (correlationBasis.isEmpty()) {
        return managedTypeClass;
    }
    EntityMetamodel entityMetamodel = evm.getMetamodel().getEntityMetamodel();
    ScalarTargetResolvingExpressionVisitor visitor = new ScalarTargetResolvingExpressionVisitor(managedTypeClass, entityMetamodel, evm.getCriteriaBuilderFactory().getRegisteredFunctions(), rootTypes);
    correlationBasisExpression.accept(visitor);
    Collection<ScalarTargetResolvingExpressionVisitor.TargetType> possibleTypes = visitor.getPossibleTargetTypes();
    if (possibleTypes.size() > 1) {
        throw new IllegalArgumentException("The correlation basis '" + correlationBasis + "' is ambiguous in the context of the managed type '" + managedTypeClass.getName() + "'!");
    }
    // It must have one, otherwise a parse error would have been thrown already
    Class<?> entityClazz = possibleTypes.iterator().next().getLeafBaseValueClass();
    if (entityClazz == null) {
        throw new IllegalArgumentException("Could not resolve the correlation basis '" + correlationBasis + "' in the context of the managed type '" + managedTypeClass.getName() + "'!");
    }
    return entityClazz;
}