https://github.com/FasterXML/jackson-datatypes-collections: Add-on datatype-support module for Jackson (https://github.com/FasterXML/jackson) that handles eclipse-collections (https://www.eclipse.org/collections/) types (FasterXML)
  • Jonas Konrad
  • Tatu Saloranta 
package com.fasterxml.jackson.datatype.eclipsecollections.ser;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import java.io.IOException;
import org.eclipse.collections.api.DoubleIterable;
import org.eclipse.collections.api.iterator.DoubleIterator;

public final class DoubleIterableSerializer extends PrimitiveIterableSerializer<DoubleIterable> {
    private static final JavaType ELEMENT_TYPE = TypeFactory.defaultInstance().constructType(double.class);

    public DoubleIterableSerializer(BeanProperty property, Boolean unwrapSingle) {
        super(DoubleIterable.class, ELEMENT_TYPE, property, unwrapSingle);
    }

    @Override
    protected DoubleIterableSerializer withResolved(BeanProperty property, Boolean unwrapSingle) {
        return new DoubleIterableSerializer(property, unwrapSingle);
    }

    @Override
    protected void serializeContents(DoubleIterable value, JsonGenerator gen) throws IOException {
        DoubleIterator iterator = value.doubleIterator();
        while (iterator.hasNext()) {
            gen.writeNumber(iterator.next());
        }
    }
}