Jackson Annotations Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Annotations Source Code files are provided in the source packge (jackson-annotations-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

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com/fasterxml/jackson/databind/deser/std/StringDeserializer.java

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.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.LogicalType;

@JacksonStdImpl
public class StringDeserializer extends StdScalarDeserializer<String> // non-final since 2.9
{
    private static final long serialVersionUID = 1L;

    /**
     * @since 2.2
     */
    public final static StringDeserializer instance = new StringDeserializer();

    public StringDeserializer() { super(String.class); }

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

    // since 2.6, slightly faster lookups for this very common type
    @Override
    public boolean isCachable() { return true; }

    @Override // since 2.9
    public Object getEmptyValue(DeserializationContext ctxt) throws JsonMappingException {
        return "";
    }

    @Override
    public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
    {
        if (p.hasToken(JsonToken.VALUE_STRING)) {
            return p.getText();
        }
        JsonToken t = p.currentToken();
        // [databind#381]
        if (t == JsonToken.START_ARRAY) {
            return _deserializeFromArray(p, ctxt);
        }
        // need to gracefully handle byte[] data, as base64
        if (t == JsonToken.VALUE_EMBEDDED_OBJECT) {
            Object ob = p.getEmbeddedObject();
            if (ob == null) {
                return null;
            }
            if (ob instanceof byte[]) {
                return ctxt.getBase64Variant().encode((byte[]) ob, false);
            }
            // otherwise, try conversion using toString()...
            return ob.toString();
        }
        // 29-Jun-2020, tatu: New! "Scalar from Object" (mostly for XML)
        if (t == JsonToken.START_OBJECT) {
            return ctxt.extractScalarFromObject(p, this, _valueClass);
        }
        // allow coercions for other scalar types
        // 17-Jan-2018, tatu: Related to [databind#1853] avoid FIELD_NAME by ensuring it's
        //   "real" scalar
        if (t.isScalarValue()) {
            String text = p.getValueAsString();
            if (text != null) {
                return text;
            }
        }
        return (String) ctxt.handleUnexpectedToken(_valueClass, p);
    }

    // Since we can never have type info ("natural type"; String, Boolean, Integer, Double):
    // (is it an error to even call this version?)
    @Override
    public String deserializeWithType(JsonParser p, DeserializationContext ctxt,
            TypeDeserializer typeDeserializer) throws IOException {
        return deserialize(p, ctxt);
    }
}

com/fasterxml/jackson/databind/deser/std/StringDeserializer.java

 

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2022-02-19, 36135👍, 0💬