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A CBOR-based serialization for Linked Data

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package com.apicatalog.cbor;

import java.io.IOException;
import java.io.Writer;
import java.util.List;

import com.apicatalog.cborld.hex.Hex;

import co.nstant.in.cbor.model.Array;
import co.nstant.in.cbor.model.ByteString;
import co.nstant.in.cbor.model.DataItem;
import co.nstant.in.cbor.model.Map;

public class CborWriter {

    final Writer writer;
    
    public CborWriter(Writer writer) {
        this.writer = writer;
    }
    
    public void write(List value) throws IOException {
        
        writer.write('[');
        
        boolean first = true;

        for (final DataItem item : value) {
            if (!first) {
                writer.write(", ");
            }
            write(item);
            first = false;
        }
        
        writer.write(']');        
    }
    
    public void write(DataItem value) throws IOException {
        
        switch (value.getMajorType()) {
        case ARRAY:
            write(((Array)value).getDataItems());
            break;
            
        case MAP:
            write((Map)value);
            break;
            
        case BYTE_STRING:
            write((ByteString)value);
            break;
            
        default:
            writer.write(value.toString());
        }
    }
    
    protected void write(Map value) throws IOException {
        
        writer.write('{');
        
        boolean first = true;
        
        for (final DataItem key : value.getKeys()) {
            if (!first) {
                writer.write(',');
            }
            writer.write(' ');
            writer.write(key.toString());
            writer.write(':');
            writer.write(' ');
            write(value.get(key));
            first = false;
        }
        writer.write(' ');
        writer.write('}');
    }

    protected void write(ByteString value) throws IOException {
        writer.write(Hex.toString(value.getBytes()));
    }
}