core/src/main/java/org/owasp/encoder/Encoders.java
public static Encoder forName(String contextName) throws NullPointerException, UnsupportedContextException {
        if (contextName == null) {
            throw new NullPointerException();
        }
        Encoder encoder = ENCODERS_MAP.get(contextName);
        if (encoder == null) {
            throw new UnsupportedContextException(contextName);
        }
        return encoder;
    }
public static Encoder forName(String contextName) throws NullPointerException, UnsupportedContextException {
        if (contextName == null) {
            throw new NullPointerException();
        }
        Encoder encoder = ENCODERS_MAP.get(contextName);
        if (encoder == null) {
            throw new UnsupportedContextException(contextName);
        }
        return encoder;
    }
Returns a new instance of an Encoder for the specified context. The
returned instance is thread-safe.

@param contextName the context name (one of the String constants defined
in this class)
@return an encoder for the specified context.
@throws NullPointerException if {@code contextName} is null
@throws UnsupportedContextException if {@code contextName} is not
recognized.