com.fasterxml.jackson.databind.deser.impl.CreatorCollector Maven / Gradle / Ivy
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package com.fasterxml.jackson.databind.deser.impl;
import java.io.IOException;
import java.lang.reflect.Member;
import java.util.*;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.deser.CreatorProperty;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.type.TypeBindings;
import com.fasterxml.jackson.databind.util.ClassUtil;
/**
* Container class for storing information on creators (based on annotations,
* visibility), to be able to build actual instantiator later on.
*/
public class CreatorCollector
{
/// Type of bean being created
final protected BeanDescription _beanDesc;
final protected boolean _canFixAccess;
/**
* Reference to the default creator (constructor or factory method).
*
* Note: name is a misnomer, after resolving of [JACKSON-850], since this
* can also point to factory method.
*/
protected AnnotatedWithParams _defaultConstructor;
protected AnnotatedWithParams _stringCreator, _intCreator, _longCreator;
protected AnnotatedWithParams _doubleCreator, _booleanCreator;
protected AnnotatedWithParams _delegateCreator;
// when there are injectable values along with delegate:
protected CreatorProperty[] _delegateArgs;
protected AnnotatedWithParams _propertyBasedCreator;
protected CreatorProperty[] _propertyBasedArgs = null;
protected AnnotatedParameter _incompleteParameter;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public CreatorCollector(BeanDescription beanDesc, boolean canFixAccess)
{
_beanDesc = beanDesc;
_canFixAccess = canFixAccess;
}
public ValueInstantiator constructValueInstantiator(DeserializationConfig config)
{
JavaType delegateType;
boolean maybeVanilla = _delegateCreator == null;
if (maybeVanilla) {
delegateType = null;
} else {
// need to find type...
int ix = 0;
if (_delegateArgs != null) {
for (int i = 0, len = _delegateArgs.length; i < len; ++i) {
if (_delegateArgs[i] == null) { // marker for delegate itself
ix = i;
break;
}
}
}
TypeBindings bindings = _beanDesc.bindingsForBeanType();
delegateType = bindings.resolveType(_delegateCreator.getGenericParameterType(ix));
}
final JavaType type = _beanDesc.getType();
// Any non-standard creator will prevent; with one exception: int-valued constructor
// that standard containers have can be ignored
maybeVanilla &= (_propertyBasedCreator == null)
&& (_delegateCreator == null)
&& (_stringCreator == null)
&& (_longCreator == null)
&& (_doubleCreator == null)
&& (_booleanCreator == null)
;
if (maybeVanilla) {
/* 10-May-2014, tatu: If we have nothing special, and we are dealing with one
* of "well-known" types, can create a non-reflection-based instantiator.
*/
final Class rawType = type.getRawClass();
if (rawType == Collection.class || rawType == List.class || rawType == ArrayList.class) {
return new Vanilla(Vanilla.TYPE_COLLECTION);
}
if (rawType == Map.class || rawType == LinkedHashMap.class) {
return new Vanilla(Vanilla.TYPE_MAP);
}
if (rawType == HashMap.class) {
return new Vanilla(Vanilla.TYPE_HASH_MAP);
}
}
StdValueInstantiator inst = new StdValueInstantiator(config, type);
inst.configureFromObjectSettings(_defaultConstructor,
_delegateCreator, delegateType, _delegateArgs,
_propertyBasedCreator, _propertyBasedArgs);
inst.configureFromStringCreator(_stringCreator);
inst.configureFromIntCreator(_intCreator);
inst.configureFromLongCreator(_longCreator);
inst.configureFromDoubleCreator(_doubleCreator);
inst.configureFromBooleanCreator(_booleanCreator);
inst.configureIncompleteParameter(_incompleteParameter);
return inst;
}
/*
/**********************************************************
/* Setters
/**********************************************************
*/
/**
* Method called to indicate the default creator: no-arguments
* constructor or factory method that is called to instantiate
* a value before populating it with data. Default creator is
* only used if no other creators are indicated.
*
* @param creator Creator method; no-arguments constructor or static
* factory method.
*/
public void setDefaultCreator(AnnotatedWithParams creator) {
_defaultConstructor = _fixAccess(creator);
}
public void addStringCreator(AnnotatedWithParams creator) {
_stringCreator = verifyNonDup(creator, _stringCreator, "String");
}
public void addIntCreator(AnnotatedWithParams creator) {
_intCreator = verifyNonDup(creator, _intCreator, "int");
}
public void addLongCreator(AnnotatedWithParams creator) {
_longCreator = verifyNonDup(creator, _longCreator, "long");
}
public void addDoubleCreator(AnnotatedWithParams creator) {
_doubleCreator = verifyNonDup(creator, _doubleCreator, "double");
}
public void addBooleanCreator(AnnotatedWithParams creator) {
_booleanCreator = verifyNonDup(creator, _booleanCreator, "boolean");
}
public void addDelegatingCreator(AnnotatedWithParams creator,
CreatorProperty[] injectables)
{
_delegateCreator = verifyNonDup(creator, _delegateCreator, "delegate");
_delegateArgs = injectables;
}
public void addPropertyCreator(AnnotatedWithParams creator, CreatorProperty[] properties)
{
_propertyBasedCreator = verifyNonDup(creator, _propertyBasedCreator, "property-based");
// [JACKSON-470] Better ensure we have no duplicate names either...
if (properties.length > 1) {
HashMap names = new HashMap();
for (int i = 0, len = properties.length; i < len; ++i) {
String name = properties[i].getName();
/* [Issue-13]: Need to consider Injectables, which may not have
* a name at all, and need to be skipped
*/
if (name.length() == 0 && properties[i].getInjectableValueId() != null) {
continue;
}
Integer old = names.put(name, Integer.valueOf(i));
if (old != null) {
throw new IllegalArgumentException("Duplicate creator property \""+name+"\" (index "+old+" vs "+i+")");
}
}
}
_propertyBasedArgs = properties;
}
public void addIncompeteParameter(AnnotatedParameter parameter) {
if (_incompleteParameter == null) {
_incompleteParameter = parameter;
}
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
/**
* @since 2.1
*/
public boolean hasDefaultCreator() {
return _defaultConstructor != null;
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
private T _fixAccess(T member)
{
if (member != null && _canFixAccess) {
ClassUtil.checkAndFixAccess((Member) member.getAnnotated());
}
return member;
}
protected AnnotatedWithParams verifyNonDup(AnnotatedWithParams newOne, AnnotatedWithParams oldOne,
String type)
{
if (oldOne != null) {
// important: ok to override factory with constructor; but not within same type, so:
if (oldOne.getClass() == newOne.getClass()) {
throw new IllegalArgumentException("Conflicting "+type+" creators: already had "+oldOne+", encountered "+newOne);
}
}
return _fixAccess(newOne);
}
/*
/**********************************************************
/* Helper class(es)
/**********************************************************
*/
protected final static class Vanilla
extends ValueInstantiator
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
public final static int TYPE_COLLECTION = 1;
public final static int TYPE_MAP = 2;
public final static int TYPE_HASH_MAP = 3;
private final int _type;
public Vanilla(int t) {
_type = t;
}
@Override
public String getValueTypeDesc() {
switch (_type) {
case TYPE_COLLECTION: return ArrayList.class.getName();
case TYPE_MAP: return LinkedHashMap.class.getName();
case TYPE_HASH_MAP: return HashMap.class.getName();
}
return Object.class.getName();
}
@Override
public boolean canInstantiate() { return true; }
@Override
public boolean canCreateUsingDefault() { return true; }
@Override
public Object createUsingDefault(DeserializationContext ctxt) throws IOException {
switch (_type) {
case TYPE_COLLECTION: return new ArrayList