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/PropertyBasedObjectIdGenerator.java

    package com.fasterxml.jackson.databind.ser.impl;
    
    import com.fasterxml.jackson.annotation.ObjectIdGenerator;
    import com.fasterxml.jackson.annotation.ObjectIdGenerators;
    
    import com.fasterxml.jackson.databind.introspect.ObjectIdInfo;
    import com.fasterxml.jackson.databind.ser.*;
    
    public class PropertyBasedObjectIdGenerator
        extends ObjectIdGenerators.PropertyGenerator
    {
        private static final long serialVersionUID = 1L;
    
        protected final BeanPropertyWriter _property;
        
        public PropertyBasedObjectIdGenerator(ObjectIdInfo oid, BeanPropertyWriter prop)
        {
            this(oid.getScope(), prop);
        }
    
        protected PropertyBasedObjectIdGenerator(Class<?> scope, BeanPropertyWriter prop)
        {
            super(scope);
            _property = prop;
        }
    
        /**
         * We must override this method, to prevent errors when scopes are the same,
         * but underlying class (on which to access property) is different.
         */
        @Override
        public boolean canUseFor(ObjectIdGenerator<?> gen) {
            if (gen.getClass() == getClass()) {
                PropertyBasedObjectIdGenerator other = (PropertyBasedObjectIdGenerator) gen;
                if (other.getScope() == _scope) {
                    /* 26-Jul-2012, tatu: This is actually not enough, because the property
                     *   accessor within BeanPropertyWriter won't work for other property fields
                     *  (see [https://github.com/FasterXML/jackson-module-jaxb-annotations/issues/9]
                     *  for details).
                     *  So we need to verify that underlying property is actually the same.
                     */
                    return (other._property == _property);
                }
            }
            return false;
        }
        
        @Override
        public Object generateId(Object forPojo) {
            try {
                return _property.get(forPojo);
            } catch (RuntimeException e) {
                throw e;
            } catch (Exception e) {
                throw new IllegalStateException("Problem accessing property '"
                        +_property.getName()+"': "+e.getMessage(), e);
            }
        }
    
        @Override
        public ObjectIdGenerator<Object> forScope(Class<?> scope) {
            return (scope == _scope) ? this : new PropertyBasedObjectIdGenerator(scope, _property);
        }
    
        @Override
        public ObjectIdGenerator<Object> newForSerialization(Object context) {
            // No state, can return this
            return this;
        }
    
        @Override
        public com.fasterxml.jackson.annotation.ObjectIdGenerator.IdKey key(Object key) {
            if (key == null) {
                return null;
            }
            // should we use general type for all; or type of property itself?
            return new IdKey(getClass(), _scope, key);
        }
    
    }
    

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

     

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    2022-03-29, 31857👍, 0💬