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-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/cfg/BaseSettings.java

package com.fasterxml.jackson.databind.cfg;

import java.text.DateFormat;
import java.util.Locale;
import java.util.TimeZone;

import com.fasterxml.jackson.core.Base64Variant;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.introspect.AccessorNamingStrategy;
import com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair;
import com.fasterxml.jackson.databind.introspect.ClassIntrospector;
import com.fasterxml.jackson.databind.introspect.DefaultAccessorNamingStrategy;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;
import com.fasterxml.jackson.databind.jsontype.TypeResolverBuilder;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.databind.util.StdDateFormat;

/**
 * Immutable container class used to store simple configuration
 * settings for both serialization and deserialization.
 * Since instances are fully immutable, instances can
 * be freely shared and used without synchronization.
 */
public final class BaseSettings
    implements java.io.Serializable
{
    private static final long serialVersionUID = 1L;

    /**
     * We will use a default TimeZone as the baseline.
     */
    private static final TimeZone DEFAULT_TIMEZONE = 
            //  TimeZone.getDefault()
            /* [databind#915] 05-Nov-2015, tatu: Changed to UTC, from earlier
             * baseline of GMT (up to 2.6)
             */
            TimeZone.getTimeZone("UTC");
    
    /*
    /**********************************************************
    /* Configuration settings; introspection, related
    /**********************************************************
     */

    /**
     * Specific factory used for creating {@link JavaType} instances;
     * needed to allow modules to add more custom type handling
     * (mostly to support types of non-Java JVM languages)
     */
    protected final TypeFactory _typeFactory;

    /**
     * Introspector used to figure out Bean properties needed for bean serialization
     * and deserialization. Overridable so that it is possible to change low-level
     * details of introspection, like adding new annotation types.
     */
    protected final ClassIntrospector _classIntrospector;

    /**
     * Introspector used for accessing annotation value based configuration.
     */
    protected final AnnotationIntrospector _annotationIntrospector;

    /**
     * Custom property naming strategy in use, if any.
     */
    protected final PropertyNamingStrategy _propertyNamingStrategy;

    /**
     * Provider for creating {@link AccessorNamingStrategy} instances to use
     *
     * @since 2.12
     */
    protected final AccessorNamingStrategy.Provider _accessorNaming;

    /*
    /**********************************************************
    /* Configuration settings; polymorphic type resolution
    /**********************************************************
     */

    /**
     * Builder used to create type resolver for serializing and deserializing
     * values for which polymorphic type handling is needed.
     */
    protected final TypeResolverBuilder<?> _typeResolverBuilder;

    /**
     * Validator that is used to limit allowed polymorphic subtypes, mostly
     * for security reasons when dealing with untrusted content.
     *
     * @since 2.10
     */
    protected final PolymorphicTypeValidator _typeValidator;

    /*
    /**********************************************************
    /* Configuration settings; other
    /**********************************************************
     */
    
    /**
     * Custom date format to use for deserialization. If specified, will be
     * used instead of {@link com.fasterxml.jackson.databind.util.StdDateFormat}.
     *<p>
     * Note that the configured format object will be cloned once per
     * deserialization process (first time it is needed)
     */
    protected final DateFormat _dateFormat;

    /**
     * Object used for creating instances of handlers (serializers, deserializers,
     * type and type id resolvers), given class to instantiate. This is typically
     * used to do additional configuration (with dependency injection, for example)
     * beyond simply construction of instances; or to use alternative constructors.
     */
    protected final HandlerInstantiator _handlerInstantiator;

    /**
     * Default {@link java.util.Locale} used with serialization formats.
     * Default value is {@link Locale#getDefault()}.
     */
    protected final Locale _locale;

    /**
     * Default {@link java.util.TimeZone} used with serialization formats,
     * if (and only if!) explicitly set by use; otherwise `null` to indicate
     * "use default", which means "UTC" (from Jackson 2.7); earlier versions
     * (up to 2.6) used "GMT".
     *<p>
     * Note that if a new value is set, timezone is also assigned to
     * {@link #_dateFormat} of this object.
     */
    protected final TimeZone _timeZone;

    /**
     * Explicitly default {@link Base64Variant} to use for handling
     * binary data (<code>byte[]</code>), used with data formats
     * that use base64 encoding (like JSON, CSV).
     * 
     * @since 2.1
     */
    protected final Base64Variant _defaultBase64;
    
    /*
    /**********************************************************
    /* Construction
    /**********************************************************
     */

    /**
     * @since 2.12
     */
    public BaseSettings(ClassIntrospector ci, AnnotationIntrospector ai,
            PropertyNamingStrategy pns, TypeFactory tf,
            TypeResolverBuilder<?> typer, DateFormat dateFormat, HandlerInstantiator hi,
            Locale locale, TimeZone tz, Base64Variant defaultBase64,
            PolymorphicTypeValidator ptv, AccessorNamingStrategy.Provider accNaming)
    {
        _classIntrospector = ci;
        _annotationIntrospector = ai;
        _propertyNamingStrategy = pns;
        _typeFactory = tf;
        _typeResolverBuilder = typer;
        _dateFormat = dateFormat;
        _handlerInstantiator = hi;
        _locale = locale;
        _timeZone = tz;
        _defaultBase64 = defaultBase64;
        _typeValidator = ptv;
        _accessorNaming = accNaming;
    }

    @Deprecated // since 2.12
    public BaseSettings(ClassIntrospector ci, AnnotationIntrospector ai,
            PropertyNamingStrategy pns, TypeFactory tf,
            TypeResolverBuilder<?> typer, DateFormat dateFormat, HandlerInstantiator hi,
            Locale locale, TimeZone tz, Base64Variant defaultBase64,
            PolymorphicTypeValidator ptv)
    {
        this(ci, ai, pns, tf, typer, dateFormat, hi, locale, tz, defaultBase64, ptv,
                new DefaultAccessorNamingStrategy.Provider());
    }

    /**
     * Turns out we are not necessarily 100% stateless, alas, since {@link ClassIntrospector}
     * typically has a cache. So this method is needed for deep copy() of Mapper.
     *
     * @since 2.9.6
     */
    public BaseSettings copy() {
        return new BaseSettings(_classIntrospector.copy(),
            _annotationIntrospector,
            _propertyNamingStrategy,
            _typeFactory,
            _typeResolverBuilder,
            _dateFormat,
            _handlerInstantiator,
            _locale,
            _timeZone,
            _defaultBase64,
            _typeValidator,
            _accessorNaming);
    }

    /*
    /**********************************************************
    /* Factory methods
    /**********************************************************
     */
    
    public BaseSettings withClassIntrospector(ClassIntrospector ci) {
        if (_classIntrospector == ci) {
            return this;
        }
        return new BaseSettings(ci, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }
    
    public BaseSettings withAnnotationIntrospector(AnnotationIntrospector ai) {
        if (_annotationIntrospector == ai) {
            return this;
        }
        return new BaseSettings(_classIntrospector, ai, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    public BaseSettings withInsertedAnnotationIntrospector(AnnotationIntrospector ai) {
        return withAnnotationIntrospector(AnnotationIntrospectorPair.create(ai, _annotationIntrospector));
    }

    public BaseSettings withAppendedAnnotationIntrospector(AnnotationIntrospector ai) {
        return withAnnotationIntrospector(AnnotationIntrospectorPair.create(_annotationIntrospector, ai));
    }

    /*
    public BaseSettings withVisibility(PropertyAccessor forMethod, JsonAutoDetect.Visibility visibility) {
        return new BaseSettings(_classIntrospector, _annotationIntrospector,
                _visibilityChecker.withVisibility(forMethod, visibility),
                _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator);
    }
    */
    
    public BaseSettings withPropertyNamingStrategy(PropertyNamingStrategy pns) {
        if (_propertyNamingStrategy == pns) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, pns, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    // @since 2.12
    public BaseSettings withAccessorNaming(AccessorNamingStrategy.Provider p) {
        if (_accessorNaming == p) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, p);
    }

    public BaseSettings withTypeFactory(TypeFactory tf) {
        if (_typeFactory == tf) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, tf,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    public BaseSettings withTypeResolverBuilder(TypeResolverBuilder<?> typer) {
        if (_typeResolverBuilder == typer) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                typer, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }
    
    public BaseSettings withDateFormat(DateFormat df) {
        if (_dateFormat == df) {
            return this;
        }
        // 26-Sep-2015, tatu: Related to [databind#939], let's try to force TimeZone if
        //   (but only if!) it has been set explicitly.
        if ((df != null) && hasExplicitTimeZone()) {
            df = _force(df, _timeZone);
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, df, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    public BaseSettings withHandlerInstantiator(HandlerInstantiator hi) {
        if (_handlerInstantiator == hi) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, hi, _locale,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    public BaseSettings with(Locale l) {
        if (_locale == l) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector, _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, l,
                _timeZone, _defaultBase64, _typeValidator, _accessorNaming);
    }

    /**
     * Fluent factory for constructing a new instance that uses specified TimeZone.
     * Note that timezone used with also be assigned to configured {@link DateFormat},
     * changing time formatting defaults.
     */
    public BaseSettings with(TimeZone tz)
    {
        if (tz == _timeZone) {
            return this;
        }
        // 18-Oct-2020, tatu: Should allow use of `null` to revert back to "Default",
        //    commented out handling used before 2.12
//        if (tz == null) {
//            throw new IllegalArgumentException();
//        }

        DateFormat df = _force(_dateFormat, (tz == null) ? DEFAULT_TIMEZONE : tz);
        return new BaseSettings(_classIntrospector, _annotationIntrospector,
                _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, df, _handlerInstantiator, _locale,
                tz, _defaultBase64, _typeValidator, _accessorNaming);
    }

    /**
     * @since 2.1
     */
    public BaseSettings with(Base64Variant base64) {
        if (base64 == _defaultBase64) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector,
                _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, base64, _typeValidator, _accessorNaming);
    }

    /**
     * @since 2.10
     */
    public BaseSettings with(PolymorphicTypeValidator v) {
        if (v == _typeValidator) {
            return this;
        }
        return new BaseSettings(_classIntrospector, _annotationIntrospector,
                _propertyNamingStrategy, _typeFactory,
                _typeResolverBuilder, _dateFormat, _handlerInstantiator, _locale,
                _timeZone, _defaultBase64, v, _accessorNaming);
    }
    
    /*
    /**********************************************************
    /* API
    /**********************************************************
     */

    public ClassIntrospector getClassIntrospector() {
        return _classIntrospector;
    }
    
    public AnnotationIntrospector getAnnotationIntrospector() {
        return _annotationIntrospector;
    }

    public PropertyNamingStrategy getPropertyNamingStrategy() {
        return _propertyNamingStrategy;
    }

    public AccessorNamingStrategy.Provider getAccessorNaming() {
        return _accessorNaming;
    }

    public TypeFactory getTypeFactory() {
        return _typeFactory;
    }

    public TypeResolverBuilder<?> getTypeResolverBuilder() {
        return _typeResolverBuilder;
    }

    /**
     * @since 2.10
     */
    public PolymorphicTypeValidator getPolymorphicTypeValidator() {
        return _typeValidator;
    }
    
    public DateFormat getDateFormat() {
        return _dateFormat;
    }

    public HandlerInstantiator getHandlerInstantiator() {
        return _handlerInstantiator;
    }

    public Locale getLocale() {
        return _locale;
    }

    public TimeZone getTimeZone() {
        TimeZone tz = _timeZone;
        return (tz == null) ? DEFAULT_TIMEZONE : tz;
    }

    /**
     * Accessor that may be called to determine whether this settings object
     * has been explicitly configured with a TimeZone (true), or is still
     * relying on the default settings (false).
     *
     * @since 2.7
     */
    public boolean hasExplicitTimeZone() {
        return (_timeZone != null);
    }
    
    public Base64Variant getBase64Variant() {
        return _defaultBase64;
    }

    /*
    /**********************************************************
    /* Helper methods
    /**********************************************************
     */

    private DateFormat _force(DateFormat df, TimeZone tz)
    {
        if (df instanceof StdDateFormat) {
            return ((StdDateFormat) df).withTimeZone(tz);
        }
        // we don't know if original format might be shared; better create a clone:
        df = (DateFormat) df.clone();
        df.setTimeZone(tz);
        return df;
    }
}

⏎ com/fasterxml/jackson/databind/cfg/BaseSettings.java

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File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
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