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

Jackson Annotations Source Code files are provided in the source packge (jackson-annotations-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

⏎ com/fasterxml/jackson/databind/node/BinaryNode.java

package com.fasterxml.jackson.databind.node;

import java.io.IOException;
import java.util.Arrays;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.SerializerProvider;


/**
 * Value node that contains Base64 encoded binary value, which will be
 * output and stored as Json String value.
 */
public class BinaryNode
    extends ValueNode
{
    private static final long serialVersionUID = 2L;

    final static BinaryNode EMPTY_BINARY_NODE = new BinaryNode(new byte[0]);

    protected final byte[] _data;

    public BinaryNode(byte[] data)
    {
        _data = data;
    }

    public BinaryNode(byte[] data, int offset, int length)
    {
        if (offset == 0 && length == data.length) {
            _data = data;
        } else {
            _data = new byte[length];
            System.arraycopy(data, offset, _data, 0, length);
        }
    }

    public static BinaryNode valueOf(byte[] data)
    {
        if (data == null) {
            return null;
        }
        if (data.length == 0) {
            return EMPTY_BINARY_NODE;
        }
        return new BinaryNode(data);
    }

    public static BinaryNode valueOf(byte[] data, int offset, int length)
    {
        if (data == null) {
            return null;
        }
        if (length == 0) {
            return EMPTY_BINARY_NODE;
        }
        return new BinaryNode(data, offset, length);
    }

    @Override
    public JsonNodeType getNodeType()
    {
        return JsonNodeType.BINARY;
    }

    @Override
    public JsonToken asToken() {
        /* No distinct type; could use one for textual values,
         * but given that it's not in text form at this point,
         * embedded-object is closest
         */
        return JsonToken.VALUE_EMBEDDED_OBJECT;
    }

    /**
     *<p>
     * Note: caller is not to modify returned array in any way, since
     * it is not a copy but reference to the underlying byte array.
     */
    @Override
    public byte[] binaryValue() { return _data; }

    /**
     * Hmmh. This is not quite as efficient as using {@link #serialize},
     * but will work correctly.
     */
    @Override
    public String asText() {
        return Base64Variants.getDefaultVariant().encode(_data, false);
    }

    @Override
    public final void serialize(JsonGenerator jg, SerializerProvider provider)
        throws IOException, JsonProcessingException
    {
        jg.writeBinary(provider.getConfig().getBase64Variant(),
                _data, 0, _data.length);
    }

    @Override
    public boolean equals(Object o)
    {
        if (o == this) return true;
        if (o == null) return false;
        if (!(o instanceof BinaryNode)) {
            return false;
        }
        return Arrays.equals(((BinaryNode) o)._data, _data);
    }

    @Override
    public int hashCode() {
        return (_data == null) ? -1 : _data.length;
    }
}

⏎ com/fasterxml/jackson/databind/node/BinaryNode.java

 

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