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    • com.fasterxml.jackson.databind.ser.std.CollectionSerializer Maven / Gradle / Ivy

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

import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;

import com.fasterxml.jackson.core.*;

import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContainerSerializer;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;

/**
 * Fallback serializer for cases where Collection is not known to be
 * of type for which more specializer serializer exists (such as
 * index-accessible List).
 * If so, we will just construct an {@link java.util.Iterator}
 * to iterate over elements.
 */
public class CollectionSerializer
    extends AsArraySerializerBase>
{
    private static final long serialVersionUID = 1L;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */

    /**
     * @since 2.6
     */
    public CollectionSerializer(JavaType elemType, boolean staticTyping, TypeSerializer vts,
            JsonSerializer valueSerializer) {
        super(Collection.class, elemType, staticTyping, vts, valueSerializer);
    }

    /**
     * @deprecated since 2.6
     */
    @Deprecated // since 2.6
    public CollectionSerializer(JavaType elemType, boolean staticTyping, TypeSerializer vts,
            BeanProperty property, JsonSerializer valueSerializer) {
        // note: assumption is 'property' is always passed as null
        this(elemType, staticTyping, vts, valueSerializer);
    }
    
    public CollectionSerializer(CollectionSerializer src,
            BeanProperty property, TypeSerializer vts, JsonSerializer valueSerializer,
            Boolean unwrapSingle) {
        super(src, property, vts, valueSerializer, unwrapSingle);
    }
    
    @Override
    public ContainerSerializer _withValueTypeSerializer(TypeSerializer vts) {
        return new CollectionSerializer(this, _property, vts, _elementSerializer, _unwrapSingle);
    }

    @Override
    public CollectionSerializer withResolved(BeanProperty property,
            TypeSerializer vts, JsonSerializer elementSerializer,
            Boolean unwrapSingle) {
        return new CollectionSerializer(this, property, vts, elementSerializer, unwrapSingle);
    }

    /*
    /**********************************************************
    /* Accessors
    /**********************************************************
     */

    @Override
    public boolean isEmpty(SerializerProvider prov, Collection value) {
        return value.isEmpty();
    }

    @Override
    public boolean hasSingleElement(Collection value) {
        return value.size() == 1;
    }

    /*
    /**********************************************************
    /* Actual serialization
    /**********************************************************
     */

    @Override
    public final void serialize(Collection 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 serializeContents(Collection value, JsonGenerator g, SerializerProvider provider) throws IOException
    {
        g.setCurrentValue(value);
        if (_elementSerializer != null) {
            serializeContentsUsing(value, g, provider, _elementSerializer);
            return;
        }
        Iterator it = value.iterator();
        if (!it.hasNext()) {
            return;
        }
        PropertySerializerMap serializers = _dynamicSerializers;
        final TypeSerializer typeSer = _valueTypeSerializer;

        int i = 0;
        try {
            do {
                Object elem = it.next();
                if (elem == null) {
                    provider.defaultSerializeNull(g);
                } else {
                    Class cc = elem.getClass();
                    JsonSerializer serializer = serializers.serializerFor(cc);
                    if (serializer == null) {
                        if (_elementType.hasGenericTypes()) {
                            serializer = _findAndAddDynamic(serializers,
                                    provider.constructSpecializedType(_elementType, cc), provider);
                        } else {
                            serializer = _findAndAddDynamic(serializers, cc, provider);
                        }
                        serializers = _dynamicSerializers;
                    }
                    if (typeSer == null) {
                        serializer.serialize(elem, g, provider);
                    } else {
                        serializer.serializeWithType(elem, g, provider, typeSer);
                    }
                }
                ++i;
            } while (it.hasNext());
        } catch (Exception e) {
            wrapAndThrow(provider, e, value, i);
        }
    }

    public void serializeContentsUsing(Collection value, JsonGenerator g, SerializerProvider provider,
            JsonSerializer ser) throws IOException
    {
        Iterator it = value.iterator();
        if (it.hasNext()) {
            TypeSerializer typeSer = _valueTypeSerializer;
            int i = 0;
            do {
                Object elem = it.next();
                try {
                    if (elem == null) {
                        provider.defaultSerializeNull(g);
                    } else {
                        if (typeSer == null) {
                            ser.serialize(elem, g, provider);
                        } else {
                            ser.serializeWithType(elem, g, provider, typeSer);
                        }
                    }
                    ++i;
                } catch (Exception e) {
                    wrapAndThrow(provider, e, value, i);
                }
            } while (it.hasNext());
        }
    }
}
    
    
    
    

    




    
    
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