Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Core Source Code files are provided in the source packge (jackson-core-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Core Source Code below:

⏎ com/fasterxml/jackson/core/StreamReadCapability.java

package com.fasterxml.jackson.core;

import com.fasterxml.jackson.core.util.JacksonFeature;

/**
 * Set of on/off capabilities that a {@link JsonParser} for given format
 * (or in case of buffering, original format) has.
 * Used in some cases to adjust aspects of things like content conversions,
 * coercions and validation by format-agnostic functionality.
 * Specific or expected usage documented by individual capability entry
 * Javadocs.
 *
 * @since 2.12
 */
public enum StreamReadCapability
    implements JacksonFeature
{
    /**
     * Capability that indicates that data format can expose multiple properties
     * with same name ("duplicates") within one Object context.
     * This is usually not enabled, except for formats like {@code xml} that
     * have content model that does not map cleanly to JSON-based token stream.
     *<p>
     * Capability may be used for allowing secondary mapping of such duplicates
     * in case of using Tree Model (see {@link TreeNode}), or "untyped" databinding
     * (mapping content as generic {@link java.lang.Object}).
     *<p>
     * Capability is currently only enabled for XML format backend.
     */
    DUPLICATE_PROPERTIES(false),

    /**
     * Capability that indicates that data format may in some cases expose Scalar values
     * (whether typed or untyped) as Object values. There are additional access methods
     * at databind level: this capability may be used to decide whether to attempt to
     * use such methods especially in potentially ambiguous cases.
     *<p>
     * Capability is currently only enabled for XML format backend.
     */
    SCALARS_AS_OBJECTS(false),

    /**
     * Capability that indicates that data format only exposed "untyped" scalars: that is,
     * instead of Number, Boolean and String types all scalar values are reported as
     * text ({@link JsonToken#VALUE_STRING})
     * unless some sort of coercion is implied by caller.
     *<p>
     * This capability is true for many textual formats like CSV, Properties and XML.
     */
    UNTYPED_SCALARS(false),

    /**
     * Capability that indicates whether data format supports reporting of
     * accurate floating point values (with respect to reported numeric type,
     * {@link com.fasterxml.jackson.core.JsonParser.NumberType#DOUBLE}) or not.
     * This usually depends on whether format stores such values natively
     * (as IEEE binary FP formats for {@code java.lang.Float} and {@code java.lang.Double};
     * using some other value preserving presentation for {@code java.math.BigDecimal})
     * or not: most binary formats do, and most textual formats do not (at least for
     * {@code Float} and {@code Double}, specifically).
     *<p>
     * In case of JSON numbers (as well as for most if not all textual formats),
     * all floating-point numbers are represented simply by decimal (10-base)
     * textual representation and can only be represented accurately using
     * {@link java.math.BigDecimal}. But for performance reasons they may be
     * (depending on settings) be exposed as {@link java.lang.Double}s (that is,
     * {@link com.fasterxml.jackson.core.JsonParser.NumberType#DOUBLE}).
     * Note that methods like {@link JsonParser#getNumberValueExact()},
     * {@link JsonParser#getValueAsString()} and
     * {@link JsonParser#getDecimalValue()} report values without
     * precision loss.
     *<p>
     * The main intended use case is to let non-Jackson code to handle cases
     * where exact accuracy is necessary in a way that handling does not incur
     * unnecessary conversions across different formats: for example, when reading
     * binary format, simple access is essentially guaranteed to expose value exactly
     * as encoded by the format (as {@code float}, {@code double} or {@code BigDecimal}),
     * whereas for textual formats like JSON it is necessary to access value explicitly
     * as {@code BigDecimal} using {@code JsonParser#getDecimalValue}.
     *<p>
     * Capability is false for text formats like JSON, but true for binary formats
     * like Smile, MessagePack, etc., where type is precisely and inexpensively
     * indicated by format.
     *
     * @since 2.14
     */
    EXACT_FLOATS(false)
    ;

    /**
     * Whether feature is enabled or disabled by default.
     */
    private final boolean _defaultState;

    private final int _mask;

    private StreamReadCapability(boolean defaultState) {
        _defaultState = defaultState;
        _mask = (1 << ordinal());
    }

    @Override
    public boolean enabledByDefault() { return _defaultState; }
    @Override
    public boolean enabledIn(int flags) { return (flags & _mask) != 0; }
    @Override
    public int getMask() { return _mask; }
}

⏎ com/fasterxml/jackson/core/StreamReadCapability.java

Or download all of them as a single archive file:

File name: jackson-core-2.14.0-sources.jar
File size: 497693 bytes
Release date: 2022-11-05
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