Jackson Data Binding Source Code

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

  • Jackson Data Binding module allows you to converts JSON to and from POJO (Plain Old Java Object) using property accessor or using annotations.
  • 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:

    ✍: FYIcenter.com

    com/fasterxml/jackson/databind/ser/impl/StringCollectionSerializer.java

    package com.fasterxml.jackson.databind.ser.impl;
    
    import java.io.IOException;
    import java.util.*;
    
    import com.fasterxml.jackson.core.*;
    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.jsontype.TypeSerializer;
    import com.fasterxml.jackson.databind.ser.std.StaticListSerializerBase;
    
    /**
     * Efficient implement for serializing {@link Collection}s that contain Strings.
     * The only complexity is due to possibility that serializer for {@link String}
     * may be overridde; because of this, logic is needed to ensure that the default
     * serializer is in use to use fastest mode, or if not, to defer to custom
     * String serializer.
     */
    @JacksonStdImpl
    @SuppressWarnings("serial")
    public class StringCollectionSerializer
        extends StaticListSerializerBase<Collection<String>>
    {
        public final static StringCollectionSerializer instance = new StringCollectionSerializer();
    
        /*
        /**********************************************************
        /* Life-cycle
        /**********************************************************
         */
        
        protected StringCollectionSerializer() {
            super(Collection.class);
        }
    
        protected StringCollectionSerializer(StringCollectionSerializer src,
                Boolean unwrapSingle)
        {
            super(src, unwrapSingle);
        }        
    
        @Override
        public JsonSerializer<?> _withResolved(BeanProperty prop, Boolean unwrapSingle) {
            return new StringCollectionSerializer(this, unwrapSingle);
        }
    
        @Override protected JsonNode contentSchema() {
            return createSchemaNode("string", true);
        }
        
        @Override
        protected void acceptContentVisitor(JsonArrayFormatVisitor visitor) throws JsonMappingException
        {
            visitor.itemsFormat(JsonFormatTypes.STRING);
        }
    
        /*
        /**********************************************************
        /* Actual serialization
        /**********************************************************
         */
        
        @Override
        public void serialize(Collection<String> value, JsonGenerator g,
                SerializerProvider provider) throws IOException
        {
            final int len = value.size();
            if (len == 1) {
                if (((_unwrapSingle == null) &&
                        provider.isEnabled(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED))
                        || (_unwrapSingle == Boolean.TRUE)) {
                    serializeContents(value, g, provider);
                    return;
                }
            }
            g.writeStartArray(value, len);
            serializeContents(value, g, provider);
            g.writeEndArray();
        }
    
        @Override
        public void serializeWithType(Collection<String> value, JsonGenerator g,
                SerializerProvider provider, TypeSerializer typeSer)
            throws IOException
        {
            WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
                    typeSer.typeId(value, JsonToken.START_ARRAY));
            g.setCurrentValue(value);
            serializeContents(value, g, provider);
            typeSer.writeTypeSuffix(g, typeIdDef);
        }
    
        private final void serializeContents(Collection<String> value, JsonGenerator g,
                SerializerProvider provider)
            throws IOException
        {
            int i = 0;
    
            try {
                for (String str : value) {
                    if (str == null) {
                        provider.defaultSerializeNull(g);
                    } else {
                        g.writeString(str);
                    }
                    ++i;
                }
            } catch (Exception e) {
                wrapAndThrow(provider, e, value, i);
            }
        }
    }
    

    com/fasterxml/jackson/databind/ser/impl/StringCollectionSerializer.java

     

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    2022-03-29, 31727👍, 0💬