Examples with SetEntity com.datastax.oss.driver.api.mapper.annotations.SetEntity used on opensource projects

Example 1 with SetEntity

use of com.datastax.oss.driver.api.mapper.annotations.SetEntity in project java-driver by datastax.

the class DaoSetEntityMethodGenerator method generate.

@Override
public Optional<MethodSpec> generate() {
    String entityParameterName = null;
    TypeElement entityElement = null;
    String targetParameterName = null;
    // SettableByName.
    if (methodElement.getParameters().size() != 2) {
        context.getMessager().error(methodElement, "Wrong number of parameters: %s methods must have two", SetEntity.class.getSimpleName());
        return Optional.empty();
    }
    TypeMirror targetParameterType = null;
    for (VariableElement parameterElement : methodElement.getParameters()) {
        TypeMirror parameterType = parameterElement.asType();
        if (context.getClassUtils().implementsSettableByName(parameterType)) {
            targetParameterName = parameterElement.getSimpleName().toString();
            targetParameterType = parameterElement.asType();
        } else if (parameterType.getKind() == TypeKind.DECLARED || parameterType.getKind() == TypeKind.TYPEVAR) {
            TypeElement parameterTypeElement = EntityUtils.asEntityElement(parameterType, typeParameters);
            if (parameterTypeElement != null) {
                entityParameterName = parameterElement.getSimpleName().toString();
                entityElement = parameterTypeElement;
            }
        }
    }
    if (entityParameterName == null || targetParameterName == null) {
        context.getMessager().error(methodElement, "Wrong parameter types: %s methods must take a %s " + "and an annotated entity (in any order)", SetEntity.class.getSimpleName(), SettableByName.class.getSimpleName());
        return Optional.empty();
    }
    // Validate the return type: either void or the same SettableByName as the parameter
    TypeMirror returnType = methodElement.getReturnType();
    boolean isVoid = returnType.getKind() == TypeKind.VOID;
    if (isVoid) {
        if (context.getClassUtils().isSame(targetParameterType, BoundStatement.class)) {
            context.getMessager().warn(methodElement, "BoundStatement is immutable, " + "this method will not modify '%s' in place. " + "It should probably return BoundStatement rather than void", targetParameterName);
        }
    } else if (!context.getTypeUtils().isSameType(returnType, targetParameterType)) {
        context.getMessager().error(methodElement, "Invalid return type: %s methods must either be void, or return the same " + "type as their settable parameter (in this case, %s to match '%s')", SetEntity.class.getSimpleName(), targetParameterType, targetParameterName);
        return Optional.empty();
    }
    // Generate the method:
    String helperFieldName = enclosingClass.addEntityHelperField(ClassName.get(entityElement));
    NullSavingStrategy nullSavingStrategy = nullSavingStrategyValidation.getNullSavingStrategy(SetEntity.class, SetEntity::nullSavingStrategy, methodElement, enclosingClass);
    // Forward to the base injector in the helper:
    return Optional.of(GeneratedCodePatterns.override(methodElement, typeParameters).addStatement("$1L$2L.set($3L, $4L, $5T.$6L, $7L)", isVoid ? "" : "return ", helperFieldName, entityParameterName, targetParameterName, NullSavingStrategy.class, nullSavingStrategy, lenient).build());
}