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/DeserializationConfig.java

package com.fasterxml.jackson.databind;

import java.util.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.json.JsonReadFeature;
import com.fasterxml.jackson.databind.cfg.*;
import com.fasterxml.jackson.databind.deser.DeserializationProblemHandler;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.jsontype.*;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.type.LogicalType;
import com.fasterxml.jackson.databind.util.LinkedNode;
import com.fasterxml.jackson.databind.util.RootNameLookup;

/**
 * Object that contains baseline configuration for deserialization
 * process. An instance is owned by {@link ObjectMapper}, which
 * passes an immutable instance to be used for deserialization process.
 *<p>
 * Note that instances are considered immutable and as such no copies
 * should need to be created for sharing; all copying is done with
 * "fluent factory" methods.
 */
public final class DeserializationConfig
    extends MapperConfigBase<DeserializationFeature, DeserializationConfig>
    implements java.io.Serializable // since 2.1
{
    // since 2.9
    private static final long serialVersionUID = 2;

    // since 2.10.1
    private final static int DESER_FEATURE_DEFAULTS = collectFeatureDefaults(DeserializationFeature.class);

    /*
    /**********************************************************
    /* Configured helper objects
    /**********************************************************
     */

    /**
     * Linked list that contains all registered problem handlers.
     * Implementation as front-added linked list allows for sharing
     * of the list (tail) without copying the list.
     */
    protected final LinkedNode<DeserializationProblemHandler> _problemHandlers;

    /**
     * Factory used for constructing {@link com.fasterxml.jackson.databind.JsonNode} instances.
     */
    protected final JsonNodeFactory _nodeFactory;

    /**
     * @since 2.12
     */
    protected final CoercionConfigs _coercionConfigs;

    /**
     * @since 2.12
     */
    protected final ConstructorDetector _ctorDetector;

    /*
    /**********************************************************
    /* Deserialization features 
    /**********************************************************
     */

    /**
     * Set of {@link DeserializationFeature}s enabled.
     */
    protected final int _deserFeatures;

    /*
    /**********************************************************
    /* Parser features: generic, format-specific
    /**********************************************************
     */

    /**
     * States of {@link com.fasterxml.jackson.core.JsonParser.Feature}s to enable/disable.
     */
    protected final int _parserFeatures;

    /**
     * Bitflag of {@link com.fasterxml.jackson.core.JsonParser.Feature}s to enable/disable
     */
    protected final int _parserFeaturesToChange;

    /**
     * States of {@link com.fasterxml.jackson.core.FormatFeature}s to enable/disable.
     *
     * @since 2.7
     */
    protected final int _formatReadFeatures;

    /**
     * Bitflag of {@link com.fasterxml.jackson.core.FormatFeature}s to enable/disable
     *
     * @since 2.7
     */
    protected final int _formatReadFeaturesToChange;

    /*
    /**********************************************************
    /* Life-cycle, primary constructors for new instances
    /**********************************************************
     */

    /**
     * Constructor used by ObjectMapper to create default configuration object instance.
     *
     * @since 2.14
     */
    public DeserializationConfig(BaseSettings base,
            SubtypeResolver str, SimpleMixInResolver mixins, RootNameLookup rootNames,
            ConfigOverrides configOverrides, CoercionConfigs coercionConfigs,
            DatatypeFeatures datatypeFeatures)
    {
        super(base, str, mixins, rootNames, configOverrides, datatypeFeatures);
        _deserFeatures = DESER_FEATURE_DEFAULTS;
        _problemHandlers = null;
        _nodeFactory = JsonNodeFactory.instance;
        _ctorDetector = null;
        _coercionConfigs = coercionConfigs;
        _parserFeatures = 0;
        _parserFeaturesToChange = 0;
        _formatReadFeatures = 0;
        _formatReadFeaturesToChange = 0;
    }

    /**
     * Copy-constructor used for making a copy used by new {@link ObjectMapper}.
     *
     * @since 2.14
     */
    protected DeserializationConfig(DeserializationConfig src,
            SubtypeResolver str, SimpleMixInResolver mixins, RootNameLookup rootNames,
            ConfigOverrides configOverrides,
            CoercionConfigs coercionConfigs)
    {
        super(src, str, mixins, rootNames, configOverrides);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _ctorDetector = src._ctorDetector;
        _coercionConfigs = coercionConfigs;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    /*
    /**********************************************************
    /* Life-cycle, secondary constructors to support
    /* "mutant factories", with single property changes
    /**********************************************************
     */

    private DeserializationConfig(DeserializationConfig src,
            long mapperFeatures, int deserFeatures,
            int parserFeatures, int parserFeatureMask,
            int formatFeatures, int formatFeatureMask)
    {
        super(src, mapperFeatures);
        _deserFeatures = deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = parserFeatures;
        _parserFeaturesToChange = parserFeatureMask;
        _formatReadFeatures = formatFeatures;
        _formatReadFeaturesToChange = formatFeatureMask;
    }

    /**
     * Copy constructor used to create a non-shared instance with given mix-in
     * annotation definitions and subtype resolver.
     */
    private DeserializationConfig(DeserializationConfig src, SubtypeResolver str)
    {
        super(src, str);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    private DeserializationConfig(DeserializationConfig src, BaseSettings base)
    {
        super(src, base);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    private DeserializationConfig(DeserializationConfig src, JsonNodeFactory f)
    {
        super(src);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = f;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    // @since 2.12
    private DeserializationConfig(DeserializationConfig src, ConstructorDetector ctorDetector)
    {
        super(src);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    private DeserializationConfig(DeserializationConfig src,
            LinkedNode<DeserializationProblemHandler> problemHandlers)
    {
        super(src);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    private DeserializationConfig(DeserializationConfig src, PropertyName rootName)
    {
        super(src, rootName);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    private DeserializationConfig(DeserializationConfig src, Class<?> view)
    {
        super(src, view);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    protected DeserializationConfig(DeserializationConfig src, ContextAttributes attrs)
    {
        super(src, attrs);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    protected DeserializationConfig(DeserializationConfig src, SimpleMixInResolver mixins)
    {
        super(src, mixins);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    /**
     * @since 2.14
     */
    protected DeserializationConfig(DeserializationConfig src,
            DatatypeFeatures datatypeFeatures)
    {
        super(src, datatypeFeatures);
        _deserFeatures = src._deserFeatures;
        _problemHandlers = src._problemHandlers;
        _nodeFactory = src._nodeFactory;
        _coercionConfigs = src._coercionConfigs;
        _ctorDetector = src._ctorDetector;
        _parserFeatures = src._parserFeatures;
        _parserFeaturesToChange = src._parserFeaturesToChange;
        _formatReadFeatures = src._formatReadFeatures;
        _formatReadFeaturesToChange = src._formatReadFeaturesToChange;
    }

    // for unit tests only:
    protected BaseSettings getBaseSettings() { return _base; }

    /*
    /**********************************************************
    /* Life-cycle, general factory methods from MapperConfig(Base)
    /**********************************************************
     */

    @Override
    protected final DeserializationConfig _withBase(BaseSettings newBase) {
        return (_base == newBase) ? this : new DeserializationConfig(this, newBase);
    }

    @Override
    protected final DeserializationConfig _withMapperFeatures(long mapperFeatures) {
        return new DeserializationConfig(this, mapperFeatures, _deserFeatures,
                _parserFeatures, _parserFeaturesToChange,
                _formatReadFeatures, _formatReadFeaturesToChange);
    }

    @Override
    protected final DeserializationConfig _with(DatatypeFeatures dtFeatures) {
        return new DeserializationConfig(this, dtFeatures);
    }

    /*
    /**********************************************************
    /* Life-cycle, specific factory methods from MapperConfig
    /**********************************************************
     */

    @Override
    public DeserializationConfig with(SubtypeResolver str) {
        return (_subtypeResolver == str) ? this : new DeserializationConfig(this, str);
    }

    @Override
    public DeserializationConfig withRootName(PropertyName rootName) {
        if (rootName == null) {
            if (_rootName == null) {
                return this;
            }
        } else if (rootName.equals(_rootName)) {
            return this;
        }
        return new DeserializationConfig(this, rootName);
    }

    @Override
    public DeserializationConfig withView(Class<?> view) {
        return (_view == view) ? this : new DeserializationConfig(this, view);
    }

    @Override
    public DeserializationConfig with(ContextAttributes attrs) {
        return (attrs == _attributes) ? this : new DeserializationConfig(this, attrs);
    }

    /*
    /**********************************************************
    /* Life-cycle, DeserializationFeature-based factory methods
    /**********************************************************
     */

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     */
    public DeserializationConfig with(DeserializationFeature feature)
    {
        int newDeserFeatures = (_deserFeatures | feature.getMask());
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     */
    public DeserializationConfig with(DeserializationFeature first,
            DeserializationFeature... features)
    {
        int newDeserFeatures = _deserFeatures | first.getMask();
        for (DeserializationFeature f : features) {
            newDeserFeatures |= f.getMask();
        }
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     */
    public DeserializationConfig withFeatures(DeserializationFeature... features)
    {
        int newDeserFeatures = _deserFeatures;
        for (DeserializationFeature f : features) {
            newDeserFeatures |= f.getMask();
        }
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }
    
    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified feature disabled.
     */
    public DeserializationConfig without(DeserializationFeature feature)
    {
        int newDeserFeatures = _deserFeatures & ~feature.getMask();
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features disabled.
     */
    public DeserializationConfig without(DeserializationFeature first,
            DeserializationFeature... features)
    {
        int newDeserFeatures = _deserFeatures & ~first.getMask();
        for (DeserializationFeature f : features) {
            newDeserFeatures &= ~f.getMask();
        }
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features disabled.
     */
    public DeserializationConfig withoutFeatures(DeserializationFeature... features)
    {
        int newDeserFeatures = _deserFeatures;
        for (DeserializationFeature f : features) {
            newDeserFeatures &= ~f.getMask();
        }
        return (newDeserFeatures == _deserFeatures) ? this :
            new DeserializationConfig(this, _mapperFeatures, newDeserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /*
    /**********************************************************
    /* Life-cycle, JsonParser.Feature-based factory methods
    /**********************************************************
     */

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     *
     * @since 2.5
     */
    public DeserializationConfig with(JsonParser.Feature feature)
    {
        int newSet = _parserFeatures | feature.getMask();
        int newMask = _parserFeaturesToChange | feature.getMask();
        return ((_parserFeatures == newSet) && (_parserFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    newSet, newMask,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     *
     * @since 2.5
     */
    public DeserializationConfig withFeatures(JsonParser.Feature... features)
    {
        int newSet = _parserFeatures;
        int newMask = _parserFeaturesToChange;
        for (JsonParser.Feature f : features) {
            int mask = f.getMask();
            newSet |= mask;
            newMask |= mask;
        }
        return ((_parserFeatures == newSet) && (_parserFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    newSet, newMask,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }
    
    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified feature disabled.
     *
     * @since 2.5
     */
    public DeserializationConfig without(JsonParser.Feature feature)
    {
        int newSet = _parserFeatures & ~feature.getMask();
        int newMask = _parserFeaturesToChange | feature.getMask();
        return ((_parserFeatures == newSet) && (_parserFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    newSet, newMask,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features disabled.
     *
     * @since 2.5
     */
    public DeserializationConfig withoutFeatures(JsonParser.Feature... features)
    {
        int newSet = _parserFeatures;
        int newMask = _parserFeaturesToChange;
        for (JsonParser.Feature f : features) {
            int mask = f.getMask();
            newSet &= ~mask;
            newMask |= mask;
        }
        return ((_parserFeatures == newSet) && (_parserFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    newSet, newMask,
                    _formatReadFeatures, _formatReadFeaturesToChange);
    }

    /*
    /**********************************************************
    /* Life-cycle, JsonParser.FormatFeature-based factory methods
    /**********************************************************
     */

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     *
     * @since 2.7
     */
    public DeserializationConfig with(FormatFeature feature)
    {
        // 08-Oct-2018, tatu: Alas, complexity due to newly (2.10) refactored json-features:
        if (feature instanceof JsonReadFeature) {
            return _withJsonReadFeatures(feature);
        }
        int newSet = _formatReadFeatures | feature.getMask();
        int newMask = _formatReadFeaturesToChange | feature.getMask();
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    newSet, newMask);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features enabled.
     *
     * @since 2.7
     */
    public DeserializationConfig withFeatures(FormatFeature... features)
    {
        // 08-Oct-2018, tatu: Alas, complexity due to newly (2.10) refactored json-features:
        if (features.length > 0 && (features[0] instanceof JsonReadFeature)) {
            return _withJsonReadFeatures(features);
        }
        int newSet = _formatReadFeatures;
        int newMask = _formatReadFeaturesToChange;
        for (FormatFeature f : features) {
            int mask = f.getMask();
            newSet |= mask;
            newMask |= mask;
        }
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    newSet, newMask);
    }
    
    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified feature disabled.
     *
     * @since 2.7
     */
    public DeserializationConfig without(FormatFeature feature)
    {
        // 08-Oct-2018, tatu: Alas, complexity due to newly (2.10) refactored json-features:
        if (feature instanceof JsonReadFeature) {
            return _withoutJsonReadFeatures(feature);
        }
        int newSet = _formatReadFeatures & ~feature.getMask();
        int newMask = _formatReadFeaturesToChange | feature.getMask();
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    newSet, newMask);
    }

    /**
     * Fluent factory method that will construct and return a new configuration
     * object instance with specified features disabled.
     *
     * @since 2.7
     */
    public DeserializationConfig withoutFeatures(FormatFeature... features)
    {
        // 08-Oct-2018, tatu: Alas, complexity due to newly (2.10) refactored json-features:
        if (features.length > 0 && (features[0] instanceof JsonReadFeature)) {
            return _withoutJsonReadFeatures(features);
        }
        int newSet = _formatReadFeatures;
        int newMask = _formatReadFeaturesToChange;
        for (FormatFeature f : features) {
            int mask = f.getMask();
            newSet &= ~mask;
            newMask |= mask;
        }
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    _parserFeatures, _parserFeaturesToChange,
                    newSet, newMask);
    }

    // temporary for 2.10
    private DeserializationConfig _withJsonReadFeatures(FormatFeature... features) {
        int parserSet = _parserFeatures;
        int parserMask = _parserFeaturesToChange;
        int newSet = _formatReadFeatures;
        int newMask = _formatReadFeaturesToChange;
        for (FormatFeature f : features) {
            final int mask = f.getMask();
            newSet |= mask;
            newMask |= mask;

            if (f instanceof JsonReadFeature) {
                JsonParser.Feature oldF = ((JsonReadFeature) f).mappedFeature();
                if (oldF != null) {
                    final int pmask = oldF.getMask();
                    parserSet |= pmask;
                    parserMask |= pmask;
                }
            }
        }
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)
                && (_parserFeatures == parserSet) && (_parserFeaturesToChange == parserMask)
                ) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    parserSet, parserMask, newSet, newMask);
    }

    // temporary for 2.10
    private DeserializationConfig _withoutJsonReadFeatures(FormatFeature... features) {
        int parserSet = _parserFeatures;
        int parserMask = _parserFeaturesToChange;
        int newSet = _formatReadFeatures;
        int newMask = _formatReadFeaturesToChange;
        for (FormatFeature f : features) {
            final int mask = f.getMask();
            newSet &= ~mask;
            newMask |= mask;

            if (f instanceof JsonReadFeature) {
                JsonParser.Feature oldF = ((JsonReadFeature) f).mappedFeature();
                if (oldF != null) {
                    final int pmask = oldF.getMask();
                    parserSet &= ~pmask;
                    parserMask |= pmask;
                }
            }
        }
        return ((_formatReadFeatures == newSet) && (_formatReadFeaturesToChange == newMask)
                && (_parserFeatures == parserSet) && (_parserFeaturesToChange == parserMask)
                ) ? this :
            new DeserializationConfig(this,  _mapperFeatures, _deserFeatures,
                    parserSet, parserMask, newSet, newMask);
    }

    /*
    /**********************************************************
    /* Life-cycle, deserialization-specific factory methods
    /**********************************************************
     */

    /**
     * Fluent factory method that will construct a new instance with
     * specified {@link JsonNodeFactory}
     */
    public DeserializationConfig with(JsonNodeFactory f) {
        if (_nodeFactory == f) {
            return this;
        }
        return new DeserializationConfig(this, f);
    }

    /**
     * @since 2.12
     */
    public DeserializationConfig with(ConstructorDetector ctorDetector) {
        if (_ctorDetector == ctorDetector) {
            return this;
        }
        return new DeserializationConfig(this, ctorDetector);
    }

    /**
     * Method that can be used to add a handler that can (try to)
     * resolve non-fatal deserialization problems.
     */
    public DeserializationConfig withHandler(DeserializationProblemHandler h)
    {
        // Sanity check: let's prevent adding same handler multiple times
        if (LinkedNode.contains(_problemHandlers, h)) {
            return this;
        }
        return new DeserializationConfig(this,
                new LinkedNode<DeserializationProblemHandler>(h, _problemHandlers));
    }

    /**
     * Method for removing all configured problem handlers; usually done to replace
     * existing handler(s) with different one(s)
     */
    public DeserializationConfig withNoProblemHandlers() {
        if (_problemHandlers == null) {
            return this;
        }
        return new DeserializationConfig(this,
                (LinkedNode<DeserializationProblemHandler>) null);
    }

    /*
    /**********************************************************
    /* JsonParser initialization
    /**********************************************************
     */

    /**
     * Method called by {@link ObjectMapper} and {@link ObjectReader}
     * to modify those {@link com.fasterxml.jackson.core.JsonParser.Feature} settings
     * that have been configured via this config instance.
     * 
     * @since 2.5
     */
    public JsonParser initialize(JsonParser p) {
        if (_parserFeaturesToChange != 0) {
            p.overrideStdFeatures(_parserFeatures, _parserFeaturesToChange);
        }
        if (_formatReadFeaturesToChange != 0) {
            p.overrideFormatFeatures(_formatReadFeatures, _formatReadFeaturesToChange);
        }
        return p;
    }

    /**
     * @since 2.12
     */
    public JsonParser initialize(JsonParser p, FormatSchema schema) {
        if (_parserFeaturesToChange != 0) {
            p.overrideStdFeatures(_parserFeatures, _parserFeaturesToChange);
        }
        if (_formatReadFeaturesToChange != 0) {
            p.overrideFormatFeatures(_formatReadFeatures, _formatReadFeaturesToChange);
        }
        if (schema != null) {
            p.setSchema(schema);
        }
        return p;
    }

    /*
    /**********************************************************
    /* MapperConfig implementation/overrides: other
    /**********************************************************
     */

    @Override
    public boolean useRootWrapping()
    {
        if (_rootName != null) { // empty String disables wrapping; non-empty enables
            return !_rootName.isEmpty();
        }
        return isEnabled(DeserializationFeature.UNWRAP_ROOT_VALUE);
    }

    /**
     * Accessor for checking whether give {@link DeserializationFeature}
     * is enabled or not.
     *
     * @param feature Feature to check
     *
     * @return True if feature is enabled; false otherwise
     */
    public final boolean isEnabled(DeserializationFeature feature) {
        return (_deserFeatures & feature.getMask()) != 0;
    }

    public final boolean isEnabled(JsonParser.Feature f, JsonFactory factory) {
        int mask = f.getMask();
        if ((_parserFeaturesToChange & mask) != 0) {
            return (_parserFeatures & f.getMask()) != 0;
        }
        return factory.isEnabled(f);
    }

    /**
     * Bulk access method for checking that all features specified by
     * mask are enabled.
     * 
     * @since 2.3
     */
    public final boolean hasDeserializationFeatures(int featureMask) {
        return (_deserFeatures & featureMask) == featureMask;
    }

    /**
     * Bulk access method for checking that at least one of features specified by
     * mask is enabled.
     * 
     * @since 2.6
     */
    public final boolean hasSomeOfFeatures(int featureMask) {
        return (_deserFeatures & featureMask) != 0;
    }

    /**
     * Bulk access method for getting the bit mask of all {@link DeserializationFeature}s
     * that are enabled.
     */
    public final int getDeserializationFeatures() {
        return _deserFeatures;
    }

    /**
     * Convenience method equivalent to:
     *<code>
     *   isEnabled(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)
     *</code>
     *
     * @since 2.9
     */
    public final boolean requiresFullValue() {
        return DeserializationFeature.FAIL_ON_TRAILING_TOKENS.enabledIn(_deserFeatures);
    }

    /**
     * Accessor for checking whether give {@link DatatypeFeature}
     * is enabled or not.
     *
     * @param feature Feature to check
     *
     * @return True if feature is enabled; false otherwise
     *
     * @since 2.14
     */
    public final boolean isEnabled(DatatypeFeature feature) {
        return _datatypeFeatures.isEnabled(feature);
    }

    /*
    /**********************************************************
    /* Other configuration
    /**********************************************************
     */

    /**
     * Method for getting head of the problem handler chain. May be null,
     * if no handlers have been added.
     */
    public LinkedNode<DeserializationProblemHandler> getProblemHandlers() {
        return _problemHandlers;
    }

    public final JsonNodeFactory getNodeFactory() {
        return _nodeFactory;
    }

    /**
     * @since 2.12
     */
    public ConstructorDetector getConstructorDetector() {
        if (_ctorDetector == null) {
            return ConstructorDetector.DEFAULT;
        }
        return _ctorDetector;
    }

    /*
    /**********************************************************
    /* Introspection methods
    /**********************************************************
     */

    /**
     * Method that will introspect full bean properties for the purpose
     * of building a bean deserializer
     *
     * @param type Type of class to be introspected
     */
    public BeanDescription introspect(JavaType type) {
        return getClassIntrospector().forDeserialization(this, type, this);
    }

    /**
     * Method that will introspect subset of bean properties needed to
     * construct bean instance.
     */
    public BeanDescription introspectForCreation(JavaType type) {
        return getClassIntrospector().forCreation(this, type, this);
    }

    /**
     * @since 2.12
     */
    public BeanDescription introspectForBuilder(JavaType builderType, BeanDescription valueTypeDesc) {
        return getClassIntrospector().forDeserializationWithBuilder(this,
                builderType, this, valueTypeDesc);
    }

    /**
     * @since 2.0
     * @deprecated Since 2.12 - use variant that takes both builder and value type
     */
    @Deprecated
    public BeanDescription introspectForBuilder(JavaType type) {
        return getClassIntrospector().forDeserializationWithBuilder(this, type, this);
    }

    /*
    /**********************************************************
    /* Support for polymorphic type handling
    /**********************************************************
     */
    
    /**
     * Helper method that is needed to properly handle polymorphic referenced
     * types, such as types referenced by {@link java.util.concurrent.atomic.AtomicReference},
     * or various "optional" types.
     * 
     * @since 2.4
     */
    public TypeDeserializer findTypeDeserializer(JavaType baseType)
        throws JsonMappingException
    {
        BeanDescription bean = introspectClassAnnotations(baseType.getRawClass());
        AnnotatedClass ac = bean.getClassInfo();
        TypeResolverBuilder<?> b = getAnnotationIntrospector().findTypeResolver(this, ac, baseType);

        /* Ok: if there is no explicit type info handler, we may want to
         * use a default. If so, config object knows what to use.
         */
        Collection<NamedType> subtypes = null;
        if (b == null) {
            b = getDefaultTyper(baseType);
            if (b == null) {
                return null;
            }
        } else {
            subtypes = getSubtypeResolver().collectAndResolveSubtypesByTypeId(this, ac);
        }
        return b.buildTypeDeserializer(this, baseType, subtypes);
    }

    /*
    /**********************************************************************
    /* CoercionConfig access
    /**********************************************************************
     */

    /**
     * General-purpose accessor for finding what to do when specified coercion
     * from shape that is now always allowed to be coerced from is requested.
     *
     * @param targetType Logical target type of coercion
     * @param targetClass Physical target type of coercion
     * @param inputShape Input shape to coerce from
     *
     * @return CoercionAction configured for specific coercion
     *
     * @since 2.12
     */
    public CoercionAction findCoercionAction(LogicalType targetType,
            Class<?> targetClass, CoercionInputShape inputShape)
    {
        return _coercionConfigs.findCoercion(this,
                targetType, targetClass, inputShape);
    }

    /**
     * More specialized accessor called in case of input being a blank
     * String (one consisting of only white space characters with length of at least one).
     * Will basically first determine if "blank as empty" is allowed: if not,
     * returns {@code actionIfBlankNotAllowed}, otherwise returns action for
     * {@link CoercionInputShape#EmptyString}.
     *
     * @param targetType Logical target type of coercion
     * @param targetClass Physical target type of coercion
     * @param actionIfBlankNotAllowed Return value to use in case "blanks as empty"
     *    is not allowed
     *
     * @return CoercionAction configured for specified coercion from blank string
     *
     * @since 2.12
     */
    public CoercionAction findCoercionFromBlankString(LogicalType targetType,
            Class<?> targetClass,
            CoercionAction actionIfBlankNotAllowed)
    {
        return _coercionConfigs.findCoercionFromBlankString(this,
                targetType, targetClass, actionIfBlankNotAllowed);
    }
}

⏎ com/fasterxml/jackson/databind/DeserializationConfig.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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