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/ser/impl/FilteredBeanPropertyWriter.java

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

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonObjectFormatVisitor;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.util.NameTransformer;

/**
 * Decorated {@link BeanPropertyWriter} that will filter out properties
 * that are not to be included in currently active JsonView.
 */
public abstract class FilteredBeanPropertyWriter
{    
    public static BeanPropertyWriter constructViewBased(BeanPropertyWriter base, Class<?>[] viewsToIncludeIn)
    {
        if (viewsToIncludeIn.length == 1) {
            return new SingleView(base, viewsToIncludeIn[0]);
        }
        return new MultiView(base, viewsToIncludeIn);
    }

    /*
    /**********************************************************
    /* Concrete sub-classes
    /**********************************************************
     */

    private final static class SingleView
        extends BeanPropertyWriter
        implements java.io.Serializable
    {
        private static final long serialVersionUID = 1L;

        protected final BeanPropertyWriter _delegate;

        protected final Class<?> _view;
        
        protected SingleView(BeanPropertyWriter delegate, Class<?> view)
        {
            super(delegate);
            _delegate = delegate;
            _view = view;
        }

        @Override
        public SingleView rename(NameTransformer transformer) {
            return new SingleView(_delegate.rename(transformer), _view);
        }
        
        @Override
        public void assignSerializer(JsonSerializer<Object> ser) {
            _delegate.assignSerializer(ser);
        }

        @Override
        public void assignNullSerializer(JsonSerializer<Object> nullSer) {
            _delegate.assignNullSerializer(nullSer);
        }
        
        @Override
        public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov)
            throws Exception
        {
            Class<?> activeView = prov.getActiveView();
            if (activeView == null || _view.isAssignableFrom(activeView)) {
                _delegate.serializeAsField(bean, gen, prov);
            } else {
                _delegate.serializeAsOmittedField(bean, gen, prov);
            }
        }

        @Override
        public void serializeAsElement(Object bean, JsonGenerator gen, SerializerProvider prov)
            throws Exception
        {
            Class<?> activeView = prov.getActiveView();
            if (activeView == null || _view.isAssignableFrom(activeView)) {
                _delegate.serializeAsElement(bean, gen, prov);
            } else {
                _delegate.serializeAsPlaceholder(bean, gen, prov);
            }
        }

        @Override
        public void depositSchemaProperty(JsonObjectFormatVisitor v,
                SerializerProvider provider) throws JsonMappingException
        {
            Class<?> activeView = provider.getActiveView();
            if (activeView == null || _view.isAssignableFrom(activeView)) {
                super.depositSchemaProperty(v, provider);
            }
        }
    }

    private final static class MultiView
        extends BeanPropertyWriter
        implements java.io.Serializable
    {
        private static final long serialVersionUID = 1L;

        protected final BeanPropertyWriter _delegate;

        protected final Class<?>[] _views;
        
        protected MultiView(BeanPropertyWriter delegate, Class<?>[] views) {
            super(delegate);
            _delegate = delegate;
            _views = views;
        }

        @Override
        public MultiView rename(NameTransformer transformer) {
            return new MultiView(_delegate.rename(transformer), _views);
        }
        
        @Override
        public void assignSerializer(JsonSerializer<Object> ser) {
            _delegate.assignSerializer(ser);
        }

        @Override
        public void assignNullSerializer(JsonSerializer<Object> nullSer) {
            _delegate.assignNullSerializer(nullSer);
        }
        
        @Override
        public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov)
            throws Exception
        {
            if (_inView(prov.getActiveView())) {
                _delegate.serializeAsField(bean, gen, prov);
                return;
            }
            _delegate.serializeAsOmittedField(bean, gen, prov);
        }

        @Override
        public void serializeAsElement(Object bean, JsonGenerator gen, SerializerProvider prov)
            throws Exception
        {
            if (_inView(prov.getActiveView())) {
                _delegate.serializeAsElement(bean, gen, prov);
                return;
            }
            _delegate.serializeAsPlaceholder(bean, gen, prov);
        }

        @Override
        public void depositSchemaProperty(JsonObjectFormatVisitor v,
                SerializerProvider provider) throws JsonMappingException
        {
            if (_inView(provider.getActiveView())) {
                super.depositSchemaProperty(v, provider);
            }
        }

        private final boolean _inView(Class<?> activeView) 
        {
            if (activeView == null) {
                return true;
            }
            final int len = _views.length;
            for (int i = 0; i < len; ++i) {
                if (_views[i].isAssignableFrom(activeView)) {
                    return true;
                }
            }
            return false;
        }
    }
}

⏎ com/fasterxml/jackson/databind/ser/impl/FilteredBeanPropertyWriter.java

 

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