com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer Maven / Gradle / Ivy

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General data-binding functionality for Jackson: works on core streaming API
There is a newer version: 2.17.0
package com.fasterxml.jackson.databind.jsontype.impl;

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.util.JsonParserSequence;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
import com.fasterxml.jackson.databind.util.TokenBuffer;

/**
 * Type deserializer used with {@link As#PROPERTY}
 * inclusion mechanism.
 * Uses regular form (additional key/value entry before actual data)
 * when typed object is expressed as JSON Object; otherwise behaves similar to how
 * {@link As#WRAPPER_ARRAY} works.
 * Latter is used if JSON representation is polymorphic
 */
public class AsPropertyTypeDeserializer extends AsArrayTypeDeserializer
{
    private static final long serialVersionUID = 1L;

    protected final As _inclusion;

    /**
     * @since 2.8
     */
    public AsPropertyTypeDeserializer(JavaType bt, TypeIdResolver idRes,
            String typePropertyName, boolean typeIdVisible, JavaType defaultImpl)
    {
        this(bt, idRes, typePropertyName, typeIdVisible, defaultImpl, As.PROPERTY);
    }
    
    /**
     * @since 2.8
     */
    public AsPropertyTypeDeserializer(JavaType bt, TypeIdResolver idRes,
            String typePropertyName, boolean typeIdVisible, JavaType defaultImpl,
            As inclusion)
    {
        super(bt, idRes, typePropertyName, typeIdVisible, defaultImpl);
        _inclusion = inclusion;
    }

    public AsPropertyTypeDeserializer(AsPropertyTypeDeserializer src, BeanProperty property) {
        super(src, property);
        _inclusion = src._inclusion;
    }
    
    @Override
    public TypeDeserializer forProperty(BeanProperty prop) {
        return (prop == _property) ? this : new AsPropertyTypeDeserializer(this, prop);
    }
    
    @Override
    public As getTypeInclusion() { return _inclusion; }

    /**
     * This is the trickiest thing to handle, since property we are looking
     * for may be anywhere...
     */
    @Override
    @SuppressWarnings("resource")
    public Object deserializeTypedFromObject(JsonParser p, DeserializationContext ctxt) throws IOException
    {
        // 02-Aug-2013, tatu: May need to use native type ids
        if (p.canReadTypeId()) {
            Object typeId = p.getTypeId();
            if (typeId != null) {
                return _deserializeWithNativeTypeId(p, ctxt, typeId);
            }
        }
        
        // but first, sanity check to ensure we have START_OBJECT or FIELD_NAME
        JsonToken t = p.getCurrentToken();
        if (t == JsonToken.START_OBJECT) {
            t = p.nextToken();
        } else if (/*t == JsonToken.START_ARRAY ||*/ t != JsonToken.FIELD_NAME) {
            /* This is most likely due to the fact that not all Java types are
             * serialized as JSON Objects; so if "as-property" inclusion is requested,
             * serialization of things like Lists must be instead handled as if
             * "as-wrapper-array" was requested.
             * But this can also be due to some custom handling: so, if "defaultImpl"
             * is defined, it will be asked to handle this case.
             */
            return _deserializeTypedUsingDefaultImpl(p, ctxt, null);
        }
        // Ok, let's try to find the property. But first, need token buffer...
        TokenBuffer tb = null;

        for (; t == JsonToken.FIELD_NAME; t = p.nextToken()) {
            String name = p.getCurrentName();
            p.nextToken(); // to point to the value
            if (name.equals(_typePropertyName)) { // gotcha!
                return _deserializeTypedForId(p, ctxt, tb);
            }
            if (tb == null) {
                tb = new TokenBuffer(p, ctxt);
            }
            tb.writeFieldName(name);
            tb.copyCurrentStructure(p);
        }
        return _deserializeTypedUsingDefaultImpl(p, ctxt, tb);
    }

    @SuppressWarnings("resource")
    protected Object _deserializeTypedForId(JsonParser p, DeserializationContext ctxt, TokenBuffer tb) throws IOException
    {
        String typeId = p.getText();
        JsonDeserializer