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

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

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ext/SqlBlobSerializer.java

package com.fasterxml.jackson.databind.ext;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.type.WritableTypeId;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonArrayFormatVisitor;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;

/**
 * Serializer implementation for {@link java.sql.Blob} to write as binary
 * (for JSON and other formats Base64-encoded String, for binary formats as
 * true binary).
 *
 * @see com.fasterxml.jackson.databind.ser.std.ByteArraySerializer
 *
 * @since 2.12
 */
@JacksonStdImpl
@SuppressWarnings("serial")
public class SqlBlobSerializer
extends StdScalarSerializer<Blob>
{
    public SqlBlobSerializer()  {
        super(Blob.class);
    }

    @Override
    public boolean isEmpty(SerializerProvider provider, Blob value) {
        // Could see if "length == 0" but that might be expensive operation
        return (value == null);
    }

    @Override
    public void serialize(Blob value, JsonGenerator gen, SerializerProvider ctxt)
            throws IOException {
        _writeValue(value, gen, ctxt);
    }

    // Copied from `com.fasterxml.jackson.databind.ser.std.ByteArraySerializer`
    @Override
    public void serializeWithType(Blob value, JsonGenerator gen, SerializerProvider ctxt,
            TypeSerializer typeSer)
        throws IOException
    {
        // most likely scalar
        WritableTypeId typeIdDef = typeSer.writeTypePrefix(gen,
                typeSer.typeId(value, JsonToken.VALUE_EMBEDDED_OBJECT));
        _writeValue(value, gen, ctxt);
        typeSer.writeTypeSuffix(gen, typeIdDef);
    }

    protected void _writeValue(Blob value, JsonGenerator gen, SerializerProvider ctxt)
            throws IOException
    {
        InputStream in = null;
        try {
            in = value.getBinaryStream();
        } catch(SQLException e)  {
            ctxt.reportMappingProblem(e,
                    "Failed to access `java.sql.Blob` value to write as binary value");
        }
        gen.writeBinary(ctxt.getConfig().getBase64Variant(), in, -1);
    }

    // Copied from `com.fasterxml.jackson.databind.ser.std.ByteArraySerializer`
    @Override
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
        throws JsonMappingException
    {
        // 08-Nov-2020, tatu: Same problem as for `byte[]`... should
        //    make work either as String/base64, or array of numbers,
        //   with a qualifier that can be used to determine it's byte[]
        JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
        if (v2 != null) {
            v2.itemsFormat(JsonFormatTypes.INTEGER);
        }
    }
}

⏎ com/fasterxml/jackson/databind/ext/SqlBlobSerializer.java

 

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