com.facebook.presto.jdbc.internal.jackson.annotation.JsonIgnore Maven / Gradle / Ivy
package com.facebook.presto.jdbc.internal.jackson.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Marker annotation that indicates that the logical property that
* the accessor (field, getter/setter method or Creator parameter
* [of {@link JsonCreator}-annotated constructor or factory method])
* is to be ignored by introspection-based
* serialization and deserialization functionality.
*
* Annotation only needs to be added to one of the accessors (often
* getter method, but may be setter, field or creator parameter),
* if the complete removal of the property is desired.
* However: if only particular accessor is to be ignored (for example,
* when ignoring one of potentially conflicting setter methods),
* this can be done by annotating other not-to-be-ignored accessors
* with {@link JsonProperty} (or its equivalents). This is considered
* so-called "split property" case and allows definitions of
* "read-only" (read from input into POJO) and "write-only" (write
* in output but ignore on output)
*
* NOTE! As Jackson 2.6, there is a new and improved way to define
* `read-only` and `write-only` properties, using
* {@link JsonProperty#access()} annotation: this is recommended over
* use of separate JsonIgnore and {@link JsonProperty}
* annotations.
*
* For example, a "getter" method that would otherwise denote
* a property (like, say, "getValue" to suggest property "value")
* to serialize, would be ignored and no such property would
* be output unless another annotation defines alternative method to use.
*
* When ignoring the whole property, the default behavior if encountering
* such property in input is to ignore it without exception; but if there
* is a {@link JsonAnySetter} it will be called instead. Either way,
* no exception will be thrown.
*
* Annotation is usually used just a like a marker annotation, that
* is, without explicitly defining 'value' argument (which defaults
* to true): but argument can be explicitly defined.
* This can be done to override an existing `JsonIgnore` by explicitly
* defining one with 'false' argument: either in a sub-class, or by
* using "mix-in annotations".
*/
@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonIgnore
{
/**
* Optional argument that defines whether this annotation is active
* or not. The only use for value 'false' if for overriding purposes
* (which is not needed often); most likely it is needed for use
* with "mix-in annotations" (aka "annotation overrides").
* For most cases, however, default value of "true" is just fine
* and should be omitted.
*
* @return True if annotation is enabled (normal case); false if it is to
* be ignored (only useful for mix-in annotations to "mask" annotation)
*/
boolean value() default true;
}