package com.fasterxml.jackson.databind.deser.std;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.NullValueProvider;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.deser.impl.NullsConstantProvider;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.databind.util.AccessPattern;
import com.fasterxml.jackson.databind.util.ClassUtil;

Intermediate base deserializer class that adds more shared accessor so that other classes can access information about contained (value) types
/** * Intermediate base deserializer class that adds more shared accessor * so that other classes can access information about contained (value) types */
@SuppressWarnings("serial") public abstract class ContainerDeserializerBase<T> extends StdDeserializer<T> implements ValueInstantiator.Gettable // since 2.9 { protected final JavaType _containerType;
Handler we need for dealing with nulls.
Since:2.9
/** * Handler we need for dealing with nulls. * * @since 2.9 */
protected final NullValueProvider _nullProvider;
Marker flag set if the _nullProvider indicates that all null content values should be skipped (instead of being possibly converted).
Since:2.9
/** * Marker flag set if the <code>_nullProvider</code> indicates that all null * content values should be skipped (instead of being possibly converted). * * @since 2.9 */
protected final boolean _skipNullValues;
Specific override for this instance (from proper, or global per-type overrides) to indicate whether single value may be taken to mean an unwrapped one-element array or not. If null, left to global defaults.
Since:2.9 (demoted from sub-classes where added in 2.7)
/** * Specific override for this instance (from proper, or global per-type overrides) * to indicate whether single value may be taken to mean an unwrapped one-element array * or not. If null, left to global defaults. * * @since 2.9 (demoted from sub-classes where added in 2.7) */
protected final Boolean _unwrapSingle; protected ContainerDeserializerBase(JavaType selfType, NullValueProvider nuller, Boolean unwrapSingle) { super(selfType); _containerType = selfType; _unwrapSingle = unwrapSingle; _nullProvider = nuller; _skipNullValues = NullsConstantProvider.isSkipper(nuller); } protected ContainerDeserializerBase(JavaType selfType) { this(selfType, null, null); }
Since:2.9
/** * @since 2.9 */
protected ContainerDeserializerBase(ContainerDeserializerBase<?> base) { this(base, base._nullProvider, base._unwrapSingle); }
Since:2.9
/** * @since 2.9 */
protected ContainerDeserializerBase(ContainerDeserializerBase<?> base, NullValueProvider nuller, Boolean unwrapSingle) { super(base._containerType); _containerType = base._containerType; _nullProvider = nuller; _unwrapSingle = unwrapSingle; _skipNullValues = NullsConstantProvider.isSkipper(nuller); } /* /********************************************************** /* Overrides /********************************************************** */ @Override // since 2.9 public JavaType getValueType() { return _containerType; } @Override // since 2.9 public Boolean supportsUpdate(DeserializationConfig config) { return Boolean.TRUE; } @Override public SettableBeanProperty findBackReference(String refName) { JsonDeserializer<Object> valueDeser = getContentDeserializer(); if (valueDeser == null) { throw new IllegalArgumentException(String.format( "Cannot handle managed/back reference '%s': type: container deserializer of type %s returned null for 'getContentDeserializer()'", refName, getClass().getName())); } return valueDeser.findBackReference(refName); } /* /********************************************************** /* Extended API /********************************************************** */
Accessor for declared type of contained value elements; either exact type, or one of its supertypes.
/** * Accessor for declared type of contained value elements; either exact * type, or one of its supertypes. */
public JavaType getContentType() { if (_containerType == null) { return TypeFactory.unknownType(); // should never occur but... } return _containerType.getContentType(); }
Accesor for deserializer use for deserializing content values.
/** * Accesor for deserializer use for deserializing content values. */
public abstract JsonDeserializer<Object> getContentDeserializer();
Since:2.9
/** * @since 2.9 */
@Override public ValueInstantiator getValueInstantiator() { return null; } @Override // since 2.9 public AccessPattern getEmptyAccessPattern() { // 02-Feb-2017, tatu: Empty containers are usually constructed as needed // and may not be shared; for some deserializers this may be further refined. return AccessPattern.DYNAMIC; } @Override // since 2.9 public Object getEmptyValue(DeserializationContext ctxt) throws JsonMappingException { ValueInstantiator vi = getValueInstantiator(); if (vi == null || !vi.canCreateUsingDefault()) { JavaType type = getValueType(); ctxt.reportBadDefinition(type, String.format("Cannot create empty instance of %s, no default Creator", type)); } try { return vi.createUsingDefault(ctxt); } catch (IOException e) { return ClassUtil.throwAsMappingException(ctxt, e); } } /* /********************************************************** /* Shared methods for sub-classes /********************************************************** */
Helper method called by various Map(-like) deserializers.
/** * Helper method called by various Map(-like) deserializers. */
protected <BOGUS> BOGUS wrapAndThrow(Throwable t, Object ref, String key) throws IOException { // to handle StackOverflow: while (t instanceof InvocationTargetException && t.getCause() != null) { t = t.getCause(); } // Errors and "plain" IOExceptions to be passed as is ClassUtil.throwIfError(t); // ... except for mapping exceptions if (t instanceof IOException && !(t instanceof JsonMappingException)) { throw (IOException) t; } // for [databind#1141] throw JsonMappingException.wrapWithPath(t, ref, ClassUtil.nonNull(key, "N/A")); } }