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/InjectableValues.java

    package com.fasterxml.jackson.databind;
    
    import java.util.*;
    
    import com.fasterxml.jackson.databind.util.ClassUtil;
    
    /**
     * Abstract class that defines API for objects that provide value to
     * "inject" during deserialization. An instance of this object
     */
    public abstract class InjectableValues
    {
        /**
         * Method called to find value identified by id <code>valueId</code> to
         * inject as value of specified property during deserialization, passing
         * POJO instance in which value will be injected if it is available
         * (will be available when injected via field or setter; not available
         * when injected via constructor or factory method argument).
         * 
         * @param valueId Object that identifies value to inject; may be a simple
         *   name or more complex identifier object, whatever provider needs
         * @param ctxt Deserialization context
         * @param forProperty Bean property in which value is to be injected
         * @param beanInstance Bean instance that contains property to inject,
         *    if available; null if bean has not yet been constructed.
         */
        public abstract Object findInjectableValue(Object valueId, DeserializationContext ctxt,
                BeanProperty forProperty, Object beanInstance) throws JsonMappingException;
    
        /*
        /**********************************************************
        /* Standard implementation
        /**********************************************************
         */
    
        /**
         * Simple standard implementation which uses a simple Map to
         * store values to inject, identified by simple String keys.
         */
        public static class Std
            extends InjectableValues
            implements java.io.Serializable
        {
            private static final long serialVersionUID = 1L;
    
            protected final Map<String,Object> _values;
            
            public Std() {
                this(new HashMap<String,Object>());
            }
    
            public Std(Map<String,Object> values) {
                _values = values;
            }
    
            public Std addValue(String key, Object value) {
                _values.put(key, value);
                return this;
            }
    
            public Std addValue(Class<?> classKey, Object value) {
                _values.put(classKey.getName(), value);
                return this;
            }
            
            @Override
            public Object findInjectableValue(Object valueId, DeserializationContext ctxt,
                    BeanProperty forProperty, Object beanInstance) throws JsonMappingException
            {
                if (!(valueId instanceof String)) {
                    ctxt.reportBadDefinition(ClassUtil.classOf(valueId),
                            String.format(
                            "Unrecognized inject value id type (%s), expecting String",
                            ClassUtil.classNameOf(valueId)));
                }
                String key = (String) valueId;
                Object ob = _values.get(key);
                if (ob == null && !_values.containsKey(key)) {
                    throw new IllegalArgumentException("No injectable id with value '"+key+"' found (for property '"+forProperty.getName()+"')");
                }
                return ob;
            }
        }
    }
    

    com/fasterxml/jackson/databind/InjectableValues.java

     

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    2022-03-29, 31688👍, 0💬