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-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Core Source Code below:

⏎ com/fasterxml/jackson/core/sym/NameN.java

package com.fasterxml.jackson.core.sym;

import java.util.Arrays;

/**
 * Generic implementation of PName used for "long" names, where long
 * means that its byte (UTF-8) representation is 13 bytes or more.
 */
public final class NameN extends Name
{
    private final int q1, q2, q3, q4; // first four quads
    private final int qlen; // total number of quads (4 + q.length)
    private final int[] q;

    NameN(String name, int hash, int q1, int q2, int q3, int q4,
            int[] quads, int quadLen) {
        super(name, hash);
        this.q1 = q1;
        this.q2 = q2;
        this.q3 = q3;
        this.q4 = q4;
        q = quads;
        qlen = quadLen;
    }

    public static NameN construct(String name, int hash, int[] q, int qlen)
    {
        /* We have specialized implementations for shorter
         * names, so let's not allow runt instances here
         */
        if (qlen < 4) {
            throw new IllegalArgumentException();
        }
        int q1 = q[0];
        int q2 = q[1];
        int q3 = q[2];
        int q4 = q[3];

        int rem = qlen - 4;

        int[] buf;
        
        if (rem > 0) {
            buf = Arrays.copyOfRange(q, 4, qlen);
        } else {
            buf = null;
        }
        return new NameN(name, hash, q1, q2, q3, q4, buf, qlen);
        
    }
    
    // Implies quad length == 1, never matches
    @Override
    public boolean equals(int quad) { return false; }

    // Implies quad length == 2, never matches
    @Override
    public boolean equals(int quad1, int quad2) { return false; }

    // Implies quad length == 3, never matches
    @Override
    public boolean equals(int quad1, int quad2, int quad3) { return false; }

    @Override
    public boolean equals(int[] quads, int len) {
        if (len != qlen) { return false; }

        // Will always have >= 4 quads, can unroll
        if (quads[0] != q1) return false;
        if (quads[1] != q2) return false;
        if (quads[2] != q3) return false;
        if (quads[3] != q4) return false;

        switch (len) {
        default:
            return _equals2(quads);
        case 8:
            if (quads[7] != q[3]) return false;
        case 7:
            if (quads[6] != q[2]) return false;
        case 6:
            if (quads[5] != q[1]) return false;
        case 5:
            if (quads[4] != q[0]) return false;
        case 4:
        }
        return true;
    }

    private final boolean _equals2(int[] quads)
    {
        final int end = qlen-4;
        for (int i = 0; i < end; ++i) {
            if (quads[i+4] != q[i]) {
                return false;
            }
        }
        return true;
    }
}

⏎ com/fasterxml/jackson/core/sym/NameN.java

 

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