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General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.introspect;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.fasterxml.jackson.databind.util.Annotations;
/**
* Helper class used to collect annotations to be stored as
* {@link com.fasterxml.jackson.databind.util.Annotations} (like {@link AnnotationMap}).
*
* @since 2.9
*/
public abstract class AnnotationCollector
{
protected final static Annotations NO_ANNOTATIONS = new NoAnnotations();
/**
* Optional data to carry along
*/
protected final Object _data;
protected AnnotationCollector(Object d) {
_data = d;
}
public static Annotations emptyAnnotations() { return NO_ANNOTATIONS; }
public static AnnotationCollector emptyCollector() {
return EmptyCollector.instance;
}
public static AnnotationCollector emptyCollector(Object data) {
return new EmptyCollector(data);
}
public abstract Annotations asAnnotations();
public abstract AnnotationMap asAnnotationMap();
public Object getData() {
return _data;
}
/*
/**********************************************************
/* API
/**********************************************************
*/
public abstract boolean isPresent(Annotation ann);
public abstract AnnotationCollector addOrOverride(Annotation ann);
/*
/**********************************************************
/* Collector implementations
/**********************************************************
*/
static class EmptyCollector extends AnnotationCollector
{
public final static EmptyCollector instance = new EmptyCollector(null);
EmptyCollector(Object data) { super(data); }
@Override
public Annotations asAnnotations() {
return NO_ANNOTATIONS;
}
@Override
public AnnotationMap asAnnotationMap() {
return new AnnotationMap();
}
@Override
public boolean isPresent(Annotation ann) { return false; }
@Override
public AnnotationCollector addOrOverride(Annotation ann) {
return new OneCollector(_data, ann.annotationType(), ann);
}
}
static class OneCollector extends AnnotationCollector
{
private Class _type;
private Annotation _value;
public OneCollector(Object data,
Class type, Annotation value) {
super(data);
_type = type;
_value = value;
}
@Override
public Annotations asAnnotations() {
return new OneAnnotation(_type, _value);
}
@Override
public AnnotationMap asAnnotationMap() {
return AnnotationMap.of(_type, _value);
}
@Override
public boolean isPresent(Annotation ann) {
return ann.annotationType() == _type;
}
@Override
public AnnotationCollector addOrOverride(Annotation ann) {
final Class type = ann.annotationType();
// true override? Just replace in-place, return
if (_type == type) {
_value = ann;
return this;
}
return new NCollector(_data, _type, _value, type, ann);
}
}
static class NCollector extends AnnotationCollector
{
protected final HashMap,Annotation> _annotations;
public NCollector(Object data,
Class type1, Annotation value1,
Class type2, Annotation value2) {
super(data);
_annotations = new HashMap<>();
_annotations.put(type1, value1);
_annotations.put(type2, value2);
}
@Override
public Annotations asAnnotations() {
if (_annotations.size() == 2) {
Iterator,Annotation>> it = _annotations.entrySet().iterator();
Map.Entry,Annotation> en1 = it.next(), en2 = it.next();
return new TwoAnnotations(en1.getKey(), en1.getValue(),
en2.getKey(), en2.getValue());
}
return new AnnotationMap(_annotations);
}
@Override
public AnnotationMap asAnnotationMap() {
AnnotationMap result = new AnnotationMap();
for (Annotation ann : _annotations.values()) {
result.add(ann);
}
return result;
}
@Override
public boolean isPresent(Annotation ann) {
return _annotations.containsKey(ann.annotationType());
}
@Override
public AnnotationCollector addOrOverride(Annotation ann) {
_annotations.put(ann.annotationType(), ann);
return this;
}
}
/*
/**********************************************************
/* Annotations implementations
/**********************************************************
*/
/**
* Immutable implementation for case where no annotations are associated with
* an annotatable entity.
*
* @since 2.9
*/
public static class NoAnnotations
implements Annotations, java.io.Serializable
{
private static final long serialVersionUID = 1L;
NoAnnotations() { }
@Override
public A get(Class cls) {
return null;
}
@Override
public boolean has(Class cls) {
return false;
}
@Override
public boolean hasOneOf(Class[] annoClasses) {
return false;
}
@Override
public int size() {
return 0;
}
}
public static class OneAnnotation
implements Annotations, java.io.Serializable
{
private static final long serialVersionUID = 1L;
private final Class _type;
private final Annotation _value;
public OneAnnotation(Class type, Annotation value) {
_type = type;
_value = value;
}
@SuppressWarnings("unchecked")
@Override
public A get(Class cls) {
if (_type == cls) {
return (A) _value;
}
return null;
}
@Override
public boolean has(Class cls) {
return (_type == cls);
}
@Override
public boolean hasOneOf(Class[] annoClasses) {
for (Class cls : annoClasses) {
if (cls == _type) {
return true;
}
}
return false;
}
@Override
public int size() {
return 1;
}
}
public static class TwoAnnotations
implements Annotations, java.io.Serializable
{
private static final long serialVersionUID = 1L;
private final Class _type1, _type2;
private final Annotation _value1, _value2;
public TwoAnnotations(Class type1, Annotation value1,
Class type2, Annotation value2) {
_type1 = type1;
_value1 = value1;
_type2 = type2;
_value2 = value2;
}
@SuppressWarnings("unchecked")
@Override
public A get(Class cls) {
if (_type1 == cls) {
return (A) _value1;
}
if (_type2 == cls) {
return (A) _value2;
}
return null;
}
@Override
public boolean has(Class cls) {
return (_type1 == cls) || (_type2 == cls);
}
@Override
public boolean hasOneOf(Class[] annoClasses) {
for (Class cls : annoClasses) {
if ((cls == _type1) || (cls == _type2)) {
return true;
}
}
return false;
}
@Override
public int size() {
return 2;
}
}
}