@Override
    public String toString() {
        return toBase64();
    }
Returns {@code true} if the specified object is a recognized data type that can be easily converted to
bytes by instances of this class, {@code false} otherwise.
<p/>
This implementation returns {@code true} IFF the specified object is an instance of one of the following
types:
<ul>
<li>{@code byte[]}</li>
<li>{@code char[]}</li>
<li>{@link ByteSource}</li>
<li>{@link String}</li>
<li>{@link File}</li>
</li>{@link InputStream}</li>
</ul>

@param o the object to test to see if it can be easily converted to bytes by instances of this class.
@return {@code true} if the specified object can be easily converted to bytes by instances of this class,
{@code false} otherwise.
@since 1.2
lang/src/main/java/org/apache/shiro/lang/util/SimpleByteSource.java