gistfile1.txt

 public static void write(final Map<String, Object> properties, final DataOutput out) throws IOException {
            if (null == properties) {
                WritableUtils.writeVInt(out, 0);
            } else {
                WritableUtils.writeVInt(out, properties.size());
                for (final Map.Entry<String, Object> entry : properties.entrySet()) {
                    out.writeUTF(entry.getKey());
                    final Class valueClass = entry.getValue().getClass();
                    final Object valueObject = entry.getValue();
                    if (valueClass.equals(Integer.class)) {
                        out.writeByte(PropertyType.INT.val);
                        WritableUtils.writeVInt(out, (Integer) valueObject);
                    } else if (valueClass.equals(Long.class)) {
                        out.writeByte(PropertyType.LONG.val);
                        WritableUtils.writeVLong(out, (Long) valueObject);
                    } else if (valueClass.equals(Float.class)) {
                        out.writeByte(PropertyType.FLOAT.val);
                        out.writeFloat((Float) valueObject);
                    } else if (valueClass.equals(Double.class)) {
                        out.writeByte(PropertyType.DOUBLE.val);
                        out.writeDouble((Double) valueObject);
                    } else if (valueClass.equals(String.class)) {
                        out.writeByte(PropertyType.STRING.val);
                        WritableUtils.writeString(out, (String) valueObject);
                    } else if (valueClass.equals(Boolean.class)) {
                        out.writeByte(PropertyType.BOOLEAN.val);
                        out.writeBoolean((Boolean) valueObject);
                    } else {
                        throw new IOException("Property value type of " + valueClass + " is not supported");
                    }
                }
            }
        }