com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 35.0.0.Beta1

Show newest version

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

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.LogicalType;
import com.fasterxml.jackson.databind.util.AccessPattern;

/**
 * Base class for deserializers that handle types that are serialized
 * as JSON scalars (non-structured, i.e. non-Object, non-Array, values).
 */
public abstract class StdScalarDeserializer extends StdDeserializer
{
    private static final long serialVersionUID = 1L;

    protected StdScalarDeserializer(Class vc) { super(vc); }
    protected StdScalarDeserializer(JavaType valueType) { super(valueType); }

    // since 2.5
    protected StdScalarDeserializer(StdScalarDeserializer src) { super(src); }

    /*
    /**********************************************************************
    /* Overridden accessors
    /**********************************************************************
     */

    @Override // since 2.12
    public LogicalType logicalType() {
        return LogicalType.OtherScalar;
    }

    /**
     * By default assumption is that scalar types cannot be updated: many are immutable
     * values (such as primitives and wrappers)
     */
    @Override // since 2.9
    public Boolean supportsUpdate(DeserializationConfig config) {
        return Boolean.FALSE;
    }

    // Typically Scalar values have default setting of "nulls as nulls"
    @Override
    public AccessPattern getNullAccessPattern() {
        return AccessPattern.ALWAYS_NULL;
    }

    // While some scalar types have non-null empty values (hence can't say "ALWAYS_NULL")
    // they are mostly immutable, shareable and so constant.
    @Override // since 2.9
    public AccessPattern getEmptyAccessPattern() {
        return AccessPattern.CONSTANT;
    }

    /*
    /**********************************************************************
    /* Default deserialization method impls
    /**********************************************************************
     */

    @Override
    public Object deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException {
        return typeDeserializer.deserializeTypedFromScalar(p, ctxt);
    }

    /**
     * Overridden to simply call deserialize() method that does not take value
     * to update, since scalar values are usually non-mergeable.
     */
    @Override // since 2.9
    public T deserialize(JsonParser p, DeserializationContext ctxt, T intoValue) throws IOException {
        // 25-Oct-2016, tatu: And if attempt is made, see if we are to complain...
        ctxt.handleBadMerge(this);
        // if that does not report an exception we can just delegate
        return deserialize(p, ctxt);
    }
}