JsonDecoder v1.0.0

package me.rabrg.json;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 *
 * @author Ryan Greene
 *
 */
public final class JsonDecoder {

    private final byte[] buffer;

    private int pos = 0;

    public JsonDecoder(final InputStream inputStream) throws IOException {
        buffer = new byte[inputStream.available()];
        inputStream.read(buffer);
    }

    public JsonDecoder(final String string) {
        buffer = string.getBytes();
    }

    public JsonDecoder(final byte[] data) {
        buffer = data;
    }

    private Object decodeObject() {
        if (buffer[pos] == '{') {
            return decodeMap();
        } else if (buffer[pos] == '"') {
            return decodeString();
        } else if (buffer[pos] == 't' || buffer[pos] == 'f') {
            return decodeBoolean();
        } else if (buffer[pos] >= '0' && buffer[pos] <= '9') {
            return decodeNumber();
        } else if (buffer[pos] >= '[') {
            return decodeList();
        }
        return null;
    }

    public Map<String, Object> decodeMap() {
        final Map<String, Object> map = new HashMap<String, Object>();
        while (buffer[pos++] != '}') {
            if (buffer[pos] == ',') {
                continue;
            }
            final String key = decodeString();
            pos++;
            final Object object = decodeObject();
            System.out.println(key + ":" + object);
            map.put(key, object);
        }
        return map;
    }

    private String decodeString() {
        int start = ++pos;
        while (buffer[++pos] != '"') {

        }
        return new String(buffer, start, pos++ - start);
    }

    private boolean decodeBoolean() {
        if (buffer[pos] == 't') {
            pos += 4;
            return true;
        } else {
            pos += 5;
            return false;
        }
    }

    private Number decodeNumber() {
        int start = pos;
        boolean integer = true;
        while (buffer[pos++] != ',') {
            if (buffer[pos] == '.') {
                integer = false;
            }
        }
        pos--;
        final String value = new String(buffer, start, pos - start);
        return integer ? Integer.parseInt(value) : Double.parseDouble(value);
    }

    private List<Object> decodeList() {
        final List<Object> list = new ArrayList<Object>();
        while (buffer[pos++] != ']') {
            list.add(decodeObject());
        }
        return list;
    }
}