Example usage for javax.lang.model.element VariableElement getConstantValue

Introduction

In this page you can find the example usage for javax.lang.model.element VariableElement getConstantValue.

Prototype

Object getConstantValue();

Source Link

Document

Returns the value of this variable if this is a final field initialized to a compile-time constant.

Usage

From source file:org.immutables.value.processor.meta.ValueType.java

private Object findSerialVersionUID() {
    for (VariableElement field : ElementFilter.fieldsIn(element.getEnclosedElements())) {
        if (field.getSimpleName().contentEquals(SERIAL_VERSION_FIELD_NAME)
                && field.asType().getKind() == TypeKind.LONG) {
            return field.getConstantValue();
        }//w w w. ja v  a 2  s  .co m
    }
    return null;
}

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From source file:auto.parse.processor.AutoParseProcessor.java

private String getSerialVersionUID(TypeElement type) {
    Types typeUtils = processingEnv.getTypeUtils();
    TypeMirror serializable = getTypeMirror(Serializable.class);
    if (typeUtils.isAssignable(type.asType(), serializable)) {
        List<VariableElement> fields = ElementFilter.fieldsIn(type.getEnclosedElements());
        for (VariableElement field : fields) {
            if (field.getSimpleName().toString().equals("serialVersionUID")) {
                Object value = field.getConstantValue();
                if (field.getModifiers().containsAll(Arrays.asList(Modifier.STATIC, Modifier.FINAL))
                        && field.asType().getKind() == TypeKind.LONG && value != null) {
                    return value + "L";
                } else {
                    reportError("serialVersionUID must be a static final long compile-time constant", field);
                    break;
                }/*from  w  w w .  j a va 2 s. c  o m*/
            }
        }
    }
    return "";
}

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