com.fasterxml.jackson.annotation.JacksonInject Maven / Gradle / Ivy
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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;
/**
* Jackson-specific annotation used for indicating that value of
* annotated property will be "injected", i.e. set based on value
* configured by ObjectMapper (usually on per-call basis).
* Usually property is not deserialized from JSON, although it is possible
* to have injected value as default and still allow optional override
* from JSON.
*/
@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JacksonInject
{
/**
* Logical id of the value to inject; if not specified (or specified
* as empty String), will use id based on declared type of property.
*
* @return Logical id of the value to inject
*/
public String value() default "";
/**
* Whether matching value from input (if any) is used for annotated property or not;
* if disabled (`OptBoolean.FALSE`), input value (if any) will be ignored;
* otherwise it will override injected value.
*
* Default is `OptBoolean.DEFAULT`, which translates to `OptBoolean.TRUE`: this is
* for backwards compatibility (2.8 and earlier always allow binding input value).
*
* @return {@link OptBoolean#TRUE} to enable use of value from input instead of
* injected value, if available; {@link OptBoolean#FALSE} if injected value will
* always be used regardless of input.
*
* @since 2.9
*/
public OptBoolean useInput() default OptBoolean.DEFAULT;
/*
/**********************************************************
/* Value class used to enclose information, allow for
/* merging of layered configuration settings, and eventually
/* decouple higher level handling from Annotation types
/* (which can not be implemented etc.)
/**********************************************************
*/
/**
* Helper class used to contain information from a single {@link JacksonInject}
* annotation, as well as to provide possible overrides from non-annotation sources.
*
* @since 2.9
*/
public static class Value
implements JacksonAnnotationValue,
java.io.Serializable
{
private static final long serialVersionUID = 1L;
protected final static Value EMPTY = new Value(null, null);
/**
* Id to use to access injected value; if `null`, "default" name, derived
* from accessor will be used.
*/
protected final Object _id;
protected final Boolean _useInput;
protected Value(Object id, Boolean useInput) {
_id = id;
_useInput = useInput;
}
@Override
public Class valueFor() {
return JacksonInject.class;
}
/*
/**********************************************************
/* Factory methods
/**********************************************************
*/
public static Value empty() {
return EMPTY;
}
public static Value construct(Object id, Boolean useInput) {
if ("".equals(id)) {
id = null;
}
if (_empty(id, useInput)) {
return EMPTY;
}
return new Value(id, useInput);
}
public static Value from(JacksonInject src) {
if (src == null) {
return EMPTY;
}
return construct(src.value(), src.useInput().asBoolean());
}
public static Value forId(Object id) {
return construct(id, null);
}
/*
/**********************************************************
/* Mutant factory methods
/**********************************************************
*/
public Value withId(Object id) {
if (id == null) {
if (_id == null) {
return this;
}
} else if (id.equals(_id)) {
return this;
}
return new Value(id, _useInput);
}
public Value withUseInput(Boolean useInput) {
if (useInput == null) {
if (_useInput == null) {
return this;
}
} else if (useInput.equals(_useInput)) {
return this;
}
return new Value(_id, useInput);
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
public Object getId() { return _id; }
public Boolean getUseInput() { return _useInput; }
public boolean hasId() {
return _id != null;
}
public boolean willUseInput(boolean defaultSetting) {
return (_useInput == null) ? defaultSetting : _useInput.booleanValue();
}
/*
/**********************************************************
/* Std method overrides
/**********************************************************
*/
@Override
public String toString() {
return String.format("JacksonInject.Value(id=%s,useInput=%s)",
_id, _useInput);
}
@Override
public int hashCode() {
int h = 1;
if (_id != null) {
h += _id.hashCode();
}
if (_useInput != null) {
h += _useInput.hashCode();
}
return h;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (o == null) return false;
if (o.getClass() == getClass()) {
Value other = (Value) o;
if (OptBoolean.equals(_useInput, other._useInput)) {
if (_id == null) {
return other._id == null;
}
return _id.equals(other._id);
}
}
return false;
}
/*
/**********************************************************
/* Other
/**********************************************************
*/
private static boolean _empty(Object id, Boolean useInput) {
return (id == null) && (useInput == null);
}
}
}