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read list value by element java types #3595

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187 changes: 160 additions & 27 deletions src/main/java/com/fasterxml/jackson/databind/ObjectReader.java
Original file line number Diff line number Diff line change
Expand Up @@ -13,12 +13,12 @@
import com.fasterxml.jackson.core.filter.TokenFilter.Inclusion;
import com.fasterxml.jackson.core.type.ResolvedType;
import com.fasterxml.jackson.core.type.TypeReference;

import com.fasterxml.jackson.databind.cfg.ContextAttributes;
import com.fasterxml.jackson.databind.cfg.DatatypeFeature;
import com.fasterxml.jackson.databind.deser.DataFormatReaders;
import com.fasterxml.jackson.databind.deser.DefaultDeserializationContext;
import com.fasterxml.jackson.databind.deser.DeserializationProblemHandler;
import com.fasterxml.jackson.databind.deser.std.CollectionDeserializer;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.TreeTraversingParser;
import com.fasterxml.jackson.databind.type.TypeFactory;
Expand Down Expand Up @@ -77,7 +77,7 @@ public class ObjectReader
protected final boolean _unwrapRoot;

/**
* Filter to be consider for JsonParser.
* Filter to be consider for JsonParser.
* Default value to be null as filter not considered.
*/
private final TokenFilter _filter;
Expand Down Expand Up @@ -192,7 +192,7 @@ protected ObjectReader(ObjectMapper mapper, DeserializationConfig config,
_unwrapRoot = config.useRootWrapping();

_rootDeserializer = _prefetchRootDeserializer(valueType);
_dataFormatReaders = null;
_dataFormatReaders = null;
_filter = null;
}

Expand Down Expand Up @@ -401,22 +401,22 @@ public ObjectReader with(DeserializationFeature first,
DeserializationFeature... other)
{
return _with(_config.with(first, other));
}
}

/**
* Method for constructing a new reader instance that is configured
* with specified features enabled.
*/
public ObjectReader withFeatures(DeserializationFeature... features) {
return _with(_config.withFeatures(features));
}
}

/**
* Method for constructing a new reader instance that is configured
* with specified feature disabled.
*/
public ObjectReader without(DeserializationFeature feature) {
return _with(_config.without(feature));
return _with(_config.without(feature));
}

/**
Expand All @@ -426,15 +426,15 @@ public ObjectReader without(DeserializationFeature feature) {
public ObjectReader without(DeserializationFeature first,
DeserializationFeature... other) {
return _with(_config.without(first, other));
}
}

/**
* Method for constructing a new reader instance that is configured
* with specified features disabled.
*/
public ObjectReader withoutFeatures(DeserializationFeature... features) {
return _with(_config.withoutFeatures(features));
}
}

/*
/**********************************************************************
Expand All @@ -460,7 +460,7 @@ public ObjectReader with(DatatypeFeature feature) {
*/
public ObjectReader withFeatures(DatatypeFeature... features) {
return _with(_config.withFeatures(features));
}
}

/**
* Method for constructing a new reader instance that is configured
Expand All @@ -469,7 +469,7 @@ public ObjectReader withFeatures(DatatypeFeature... features) {
* @since 2.14
*/
public ObjectReader without(DatatypeFeature feature) {
return _with(_config.without(feature));
return _with(_config.without(feature));
}

/**
Expand All @@ -480,7 +480,7 @@ public ObjectReader without(DatatypeFeature feature) {
*/
public ObjectReader withoutFeatures(DatatypeFeature... features) {
return _with(_config.withoutFeatures(features));
}
}

/*
/**********************************************************
Expand Down Expand Up @@ -511,7 +511,7 @@ public ObjectReader with(JsonParser.Feature feature) {
*/
public ObjectReader withFeatures(JsonParser.Feature... features) {
return _with(_config.withFeatures(features));
}
}

/**
* Method for constructing a new reader instance that is configured
Expand All @@ -522,7 +522,7 @@ public ObjectReader withFeatures(JsonParser.Feature... features) {
* @return Reader instance with specified feature disabled
*/
public ObjectReader without(JsonParser.Feature feature) {
return _with(_config.without(feature));
return _with(_config.without(feature));
}

/**
Expand Down Expand Up @@ -591,7 +591,7 @@ public ObjectReader with(FormatFeature feature) {
*/
public ObjectReader withFeatures(FormatFeature... features) {
return _with(_config.withFeatures(features));
}
}

/**
* Method for constructing a new reader instance that is configured
Expand All @@ -600,7 +600,7 @@ public ObjectReader withFeatures(FormatFeature... features) {
* @since 2.7
*/
public ObjectReader without(FormatFeature feature) {
return _with(_config.without(feature));
return _with(_config.without(feature));
}

/**
Expand All @@ -620,8 +620,8 @@ public ObjectReader withoutFeatures(FormatFeature... features) {
*/

/**
* Convenience method to bind from {@link JsonPointer}.
* {@link JsonPointerBasedFilter} is registered and will be used for parsing later.
* Convenience method to bind from {@link JsonPointer}.
* {@link JsonPointerBasedFilter} is registered and will be used for parsing later.
* @since 2.6
*/
public ObjectReader at(final String pointerExpr) {
Expand All @@ -648,7 +648,7 @@ public ObjectReader at(final JsonPointer pointer) {
*/
public ObjectReader with(DeserializationConfig config) {
return _with(config);
}
}

/**
* Method for constructing a new instance with configuration that uses
Expand Down Expand Up @@ -776,7 +776,7 @@ public ObjectReader forType(JavaType valueType)
}
return _new(this, _config, valueType, rootDeser,
_valueToUpdate, _schema, _injectableValues, det);
}
}

/**
* Method for constructing a new reader instance that is configured
Expand All @@ -789,7 +789,7 @@ public ObjectReader forType(JavaType valueType)
*/
public ObjectReader forType(Class<?> valueType) {
return forType(_config.constructType(valueType));
}
}

/**
* Method for constructing a new reader instance that is configured
Expand All @@ -802,7 +802,7 @@ public ObjectReader forType(Class<?> valueType) {
*/
public ObjectReader forType(TypeReference<?> valueTypeRef) {
return forType(_config.getTypeFactory().constructType(valueTypeRef.getType()));
}
}

/**
* @deprecated since 2.5 Use {@link #forType(JavaType)} instead
Expand All @@ -818,7 +818,7 @@ public ObjectReader withType(JavaType valueType) {
@Deprecated
public ObjectReader withType(Class<?> valueType) {
return forType(_config.constructType(valueType));
}
}

/**
* @deprecated since 2.5 Use {@link #forType(Class)} instead
Expand All @@ -834,11 +834,11 @@ public ObjectReader withType(java.lang.reflect.Type valueType) {
@Deprecated
public ObjectReader withType(TypeReference<?> valueTypeRef) {
return forType(_config.getTypeFactory().constructType(valueTypeRef.getType()));
}
}

/**
* Method for constructing a new instance with configuration that
* updates passed Object (as root value), instead of constructing
* updates passed Object (as root value), instead of constructing
* a new value.
*<p>
* Note that the method does NOT change state of this reader, but
Expand Down Expand Up @@ -1294,6 +1294,139 @@ public <T> T readValue(JsonParser p, JavaType valueType) throws IOException {
return (T) forType(valueType).readValue(p);
}

@SuppressWarnings("unchecked")
public List<Object> readValue(JsonParser p, List<JavaType> elementTypeList) throws IOException {
if (_valueType == null || !List.class.isAssignableFrom(_valueType.getRawClass())) {
return forType(List.class).readValue(p, elementTypeList);
}
_assertNotNull("p", p);
_assertNotNull("elementTypeList", elementTypeList);
List<Object> result;
final DefaultDeserializationContext ctxt = createDeserializationContext(p);
JsonToken t = _initForReading(ctxt, p);
if (t == JsonToken.VALUE_NULL) {
if (_valueToUpdate == null) {
result = (List<Object>) _findRootDeserializer(ctxt).getNullValue(ctxt);
} else {
result = (List<Object>)_valueToUpdate;
}
} else if (t == JsonToken.END_ARRAY || t == JsonToken.END_OBJECT) {
result = (List<Object>) _valueToUpdate;
} else { // pointing to event other than null
CollectionDeserializer deser =
(CollectionDeserializer) ((JsonDeserializer<?>) _findRootDeserializer(ctxt));
if (_config.useRootWrapping()) {
return _unwrapAndDeserializeWithElementTypeList(
p, ctxt, _valueType, deser, _valueToUpdate, elementTypeList);
}
if (_valueToUpdate == null) {
return deserializeList(deser, p, ctxt, elementTypeList);
}
return deserializeList(deser, p, ctxt, (List<Object>) _valueToUpdate, elementTypeList);
}
// Need to consume the token too
p.clearCurrentToken();
if (_config.isEnabled(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)) {
_verifyNoTrailingTokens(p, ctxt, _valueType);
}
return result;
}

@SuppressWarnings("unchecked")
protected List<Object> _unwrapAndDeserializeWithElementTypeList(JsonParser p,
DefaultDeserializationContext ctxt,
JavaType rootType, CollectionDeserializer deser,
Object valueToUpdate, List<JavaType> elementTypeList)
throws IOException
{
PropertyName expRootName = _config.findRootName(rootType);
String expSimpleName = expRootName.getSimpleName();
if (p.currentToken() != JsonToken.START_OBJECT) {
ctxt.reportWrongTokenException(rootType, JsonToken.START_OBJECT,
"Current token not START_OBJECT (needed to unwrap root name %s), but %s",
ClassUtil.name(expSimpleName), p.currentToken());
}
if (p.nextToken() != JsonToken.FIELD_NAME) {
ctxt.reportWrongTokenException(rootType, JsonToken.FIELD_NAME,
"Current token not FIELD_NAME (to contain expected root name %s), but %s",
ClassUtil.name(expSimpleName), p.currentToken());
}
String actualName = p.currentName();
if (!expSimpleName.equals(actualName)) {
ctxt.reportPropertyInputMismatch(rootType, actualName,
"Root name (%s) does not match expected (%s) for type %s",
ClassUtil.name(actualName), ClassUtil.name(expSimpleName),
ClassUtil.getTypeDescription(rootType));
}
p.nextToken();
final List<Object> result;
if (valueToUpdate == null) {
result = deserializeList(deser, p, ctxt, elementTypeList);
} else {
result = deserializeList(deser, p, ctxt, (List<Object>) valueToUpdate, elementTypeList);
}
if (p.nextToken() != JsonToken.END_OBJECT) {
ctxt.reportWrongTokenException(rootType, JsonToken.END_OBJECT,
"Current token not END_OBJECT (to match wrapper object with root name %s), but %s",
ClassUtil.name(expSimpleName), p.currentToken());
}
return result;
}

@SuppressWarnings("unchecked")
protected List<Object> deserializeList(CollectionDeserializer deser, JsonParser p,
DeserializationContext ctxt, List<JavaType> elemenTypeList)
throws IOException
{
if (p.isExpectedStartArrayToken()) {
List<Object> result = (List<Object>) deser.getValueInstantiator().createUsingDefault(ctxt);
return _deserializeFromArrayWithElementTypeList(p, ctxt, result, elemenTypeList);
}
return (List<Object>) ctxt.handleUnexpectedToken(deser.getValueType(), p);
}

@SuppressWarnings("unchecked")
protected List<Object> deserializeList(CollectionDeserializer deser, JsonParser p,
DeserializationContext ctxt, List<Object> result, List<JavaType> elemenTypeList)
throws IOException
{
if (p.isExpectedStartArrayToken()) {
return _deserializeFromArrayWithElementTypeList(p, ctxt, result, elemenTypeList);
}
return (List<Object>) ctxt.handleUnexpectedToken(deser.getValueType(), p);
}

protected List<Object> _deserializeFromArrayWithElementTypeList(JsonParser p,
DeserializationContext ctxt, List<Object> result, List<JavaType> elemenTypeList)
throws IOException
{
p.setCurrentValue(result);

JsonDeserializer<Object> valueDes = null;
JsonToken t;
int idx = -1;
while ((t = p.nextToken()) != JsonToken.END_ARRAY) {
try {
idx++;
valueDes = ctxt.findContextualValueDeserializer(elemenTypeList.get(idx), null);
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else {
value = valueDes.deserialize(p, ctxt);
}
result.add(value);
} catch (Exception e) {
boolean wrap = (ctxt == null) || ctxt.isEnabled(DeserializationFeature.WRAP_EXCEPTIONS);
if (!wrap) {
ClassUtil.throwIfRTE(e);
}
throw JsonMappingException.wrapWithPath(e, result, result.size());
}
}
return result;
}

/**
* Convenience method that is equivalent to:
*<pre>
Expand Down Expand Up @@ -2208,7 +2341,7 @@ protected <T> MappingIterator<T> _bindAndReadValues(JsonParser p) throws IOExcep
}

/**
* Consider filter when creating JsonParser.
* Consider filter when creating JsonParser.
*/
protected JsonParser _considerFilter(final JsonParser p, boolean multiValue) {
// 26-Mar-2016, tatu: Need to allow multiple-matches at least if we have
Expand Down Expand Up @@ -2259,7 +2392,7 @@ protected Object _detectBindAndClose(DataFormatReaders.Match match, boolean forc
_reportUnkownFormat(_dataFormatReaders, match);
}
JsonParser p = match.createParserWithMatch();
// One more thing: we Own the input stream now; and while it's
// One more thing: we Own the input stream now; and while it's
// not super clean way to do it, we must ensure closure so:
if (forceClosing) {
p.enable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
Expand All @@ -2275,7 +2408,7 @@ protected <T> MappingIterator<T> _detectBindAndReadValues(DataFormatReaders.Matc
_reportUnkownFormat(_dataFormatReaders, match);
}
JsonParser p = match.createParserWithMatch();
// One more thing: we Own the input stream now; and while it's
// One more thing: we Own the input stream now; and while it's
// not super clean way to do it, we must ensure closure so:
if (forceClosing) {
p.enable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
Expand Down
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