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A CBOR-based serialization for Linked Data

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package com.apicatalog.cborld.dictionary;

import java.math.BigInteger;
import java.util.HashMap;
import java.util.Map;

import com.apicatalog.cborld.hex.Hex;

/**
 * A registry of well-know term values as defined by the specification.
 *
 * @see Term Codeec Registry
 *
 */
public class ContextDictionary implements Dictionary {

    private static final byte OFFSET = 0x10;

    private static final String[] TERMS = new String[] {
        "https://www.w3.org/ns/activitystreams",
        "https://www.w3.org/2018/credentials/v1",
        "https://www.w3.org/ns/did/v1",
        "https://w3id.org/security/suites/ed25519-2018/v1",
        "https://w3id.org/security/suites/ed25519-2020/v1",
        "https://w3id.org/cit/v1",
        "https://w3id.org/age/v1",
        "https://w3id.org/security/suites/x25519-2020/v1",
        "https://w3id.org/veres-one/v1",
        "https://w3id.org/webkms/v1",
        "https://w3id.org/zcap/v1",
        "https://w3id.org/security/suites/hmac-2019/v1",
        "https://w3id.org/security/suites/aes-2019/v1",
        "https://w3id.org/vaccination/v1",
        "https://w3id.org/vc-revocation-list-2020/v1",
        "https://w3id.org/dcc/v1",
        "https://w3id.org/vc/status-list/v1",
    };

    private static final Map CODEC_INDEX = new HashMap<>();

    static {
        for (int i = 0; i < TERMS.length; i++) {
            CODEC_INDEX.put(TERMS[i].hashCode(), OFFSET + i);
        }
    }

    @Override
    public BigInteger getCode(String term) {
        Integer code = CODEC_INDEX.get(term.hashCode());
    
        if (code != null) {
            return BigInteger.valueOf(code);
        }
    
        return null;
    }
    
    @Override
    public String getValue(BigInteger code) {
    
        final int value = code.intValueExact();
    
        if (value < OFFSET) {
            throw new IllegalArgumentException(
                        "Invalid code " + Hex.toString(code.toByteArray())  + "."
                        + "Available range "
                                + Hex.toString(OFFSET)
                                + "-"
                                + Hex.toString((byte)(OFFSET + TERMS.length))
                                + "."
                            );
        }
        return TERMS[value - OFFSET];
    }

    public String getTerm(Integer code) {
        return TERMS[code - OFFSET];
    }
}