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package com.fasterxml.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 annotated method or field is to be
 * ignored by introspection-based
 * serialization and deserialization functionality. That is, it should
 * not be consider a "getter", "setter" or "creator".
 *
 * In addition, starting with Jackson 1.9, if this is the only annotation
 * associated with a property, it will also cause cause the whole
 * property to be ignored: that is, if setter has this annotation and
 * getter has no annotations, getter is also effectively ignored.
 * It is still possible for different accessors to use different
 * annotations; so if only "getter" is to be ignored, other accessors
 * (setter or field) would need explicit annotation to prevent
 * ignoral (usually {@link JsonProperty}).
 * 

 * 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.
 *

 * Before version 1.9, this annotation worked purely on method-by-method (or field-by-field)
 * basis; annotation on one method or field did not imply ignoring other methods
 * or fields. However, with version 1.9 and above, annotations associated
 * with various accessors (getter, setter, field, constructor parameter) of
 * a logical property are combined; meaning that annotations in one (say, setter)
 * can have effects on all of them (if getter or field has nothing indicating
 * otherwise).
 *

 * 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.
 *
 * Annotation is similar to {@link javax.xml.bind.annotation.XmlTransient} 
 */
@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.
     */
    boolean value() default true;
}