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package com.fasterxml.jackson.databind.deser.impl;
import java.io.IOException;
import java.util.BitSet;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.SettableAnyProperty;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
/**
* Simple container used for temporarily buffering a set of
* PropertyValues.
* Using during construction of beans (and Maps) that use Creators,
* and hence need buffering before instance (that will have properties
* to assign values to) is constructed.
*/
public class PropertyValueBuffer
{
/*
/**********************************************************
/* Configuration
/**********************************************************
*/
protected final JsonParser _parser;
protected final DeserializationContext _context;
protected final ObjectIdReader _objectIdReader;
/*
/**********************************************************
/* Accumulated properties, other stuff
/**********************************************************
*/
/**
* Buffer used for storing creator parameters for constructing
* instance.
*/
protected final Object[] _creatorParameters;
/**
* Number of creator parameters for which we have not yet received
* values.
*/
protected int _paramsNeeded;
/**
* Bitflag used to track parameters found from incoming data
* when number of parameters is
* less than 32 (fits in int).
*/
protected int _paramsSeen;
/**
* Bitflag used to track parameters found from incoming data
* when number of parameters is
* 32 or higher.
*/
protected final BitSet _paramsSeenBig;
/**
* If we get non-creator parameters before or between
* creator parameters, those need to be buffered. Buffer
* is just a simple linked list
*/
protected PropertyValue _buffered;
/**
* In case there is an Object Id property to handle, this is the value
* we have for it.
*/
protected Object _idValue;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public PropertyValueBuffer(JsonParser p, DeserializationContext ctxt, int paramCount,
ObjectIdReader oir)
{
_parser = p;
_context = ctxt;
_paramsNeeded = paramCount;
_objectIdReader = oir;
_creatorParameters = new Object[paramCount];
if (paramCount < 32) {
_paramsSeenBig = null;
} else {
_paramsSeenBig = new BitSet();
}
}
/**
* Returns {@code true} if the given property was seen in the JSON source by
* this buffer.
*
* @since 2.8
*/
public final boolean hasParameter(SettableBeanProperty prop)
{
if (_paramsSeenBig == null) {
return ((_paramsSeen >> prop.getCreatorIndex()) & 1) == 1;
}
return _paramsSeenBig.get(prop.getCreatorIndex());
}
/**
* A variation of {@link #getParameters(SettableBeanProperty[])} that
* accepts a single property. Whereas the plural form eagerly fetches and
* validates all properties, this method may be used (along with
* {@link #hasParameter(SettableBeanProperty)}) to let applications only
* fetch the properties defined in the JSON source itself, and to have some
* other customized behavior for missing properties.
*
* @since 2.8
*/
public Object getParameter(SettableBeanProperty prop)
throws JsonMappingException
{
Object value;
if (hasParameter(prop)) {
value = _creatorParameters[prop.getCreatorIndex()];
} else {
value = _creatorParameters[prop.getCreatorIndex()] = _findMissing(prop);
}
if (value == null && _context.isEnabled(DeserializationFeature.FAIL_ON_NULL_CREATOR_PROPERTIES)) {
throw _context.mappingException(
"Null value for creator property '%s'; DeserializationFeature.FAIL_ON_NULL_FOR_CREATOR_PARAMETERS enabled",
prop.getName(), prop.getCreatorIndex());
}
return value;
}
/**
* Method called to do necessary post-processing such as injection of values
* and verification of values for required properties,
* after either {@link #assignParameter(SettableBeanProperty, Object)}
* returns true (to indicate all creator properties are found), or when
* then whole JSON Object has been processed,
*/
public Object[] getParameters(SettableBeanProperty[] props)
throws JsonMappingException
{
// quick check to see if anything else is needed
if (_paramsNeeded > 0) {
if (_paramsSeenBig == null) {
int mask = _paramsSeen;
// not optimal, could use `Integer.trailingZeroes()`, but for now should not
// really matter for common cases
for (int ix = 0, len = _creatorParameters.length; ix < len; ++ix, mask >>= 1) {
if ((mask & 1) == 0) {
_creatorParameters[ix] = _findMissing(props[ix]);
}
}
} else {
final int len = _creatorParameters.length;
for (int ix = 0; (ix = _paramsSeenBig.nextClearBit(ix)) < len; ++ix) {
_creatorParameters[ix] = _findMissing(props[ix]);
}
}
}
if (_context.isEnabled(DeserializationFeature.FAIL_ON_NULL_CREATOR_PROPERTIES)) {
for (int ix = 0; ix < props.length; ++ix) {
if (_creatorParameters[ix] == null) {
_context.reportMappingException("Null value for creator property '%s'; DeserializationFeature.FAIL_ON_NULL_FOR_CREATOR_PARAMETERS enabled",
props[ix].getName(), props[ix].getCreatorIndex());
}
}
}
return _creatorParameters;
}
protected Object _findMissing(SettableBeanProperty prop) throws JsonMappingException
{
// First: do we have injectable value?
Object injectableValueId = prop.getInjectableValueId();
if (injectableValueId != null) {
return _context.findInjectableValue(prop.getInjectableValueId(),
prop, null);
}
// Second: required?
if (prop.isRequired()) {
_context.reportMappingException("Missing required creator property '%s' (index %d)",
prop.getName(), prop.getCreatorIndex());
}
if (_context.isEnabled(DeserializationFeature.FAIL_ON_MISSING_CREATOR_PROPERTIES)) {
_context.reportMappingException("Missing creator property '%s' (index %d); DeserializationFeature.FAIL_ON_MISSING_CREATOR_PROPERTIES enabled",
prop.getName(), prop.getCreatorIndex());
}
// Third: default value
JsonDeserializer
