synchronized public CodeConverterBase getConverter()

in yoko-core/src/main/java/org/apache/yoko/orb/OB/CodeSetDatabase.java [142:204]
42 lines of code
24 McCabe index (conditional complexity)

    synchronized public CodeConverterBase getConverter(int to, int from) {
        CodeSetInfo toSet = getCodeSetInfo(to);
        CodeSetInfo fromSet = getCodeSetInfo(from);

        if (toSet != null && fromSet != null) {
            if (toSet.max_bytes == 1) {
                //
                // Optimization: Don't use converter for identical
                // narrow codesets
                //
                if (to == from)
                    return null;
            }
        }

        CodeConverterBase converter = null;

        //
        // Conversion possible at all?
        //
        if (fromSet == null || toSet == null) {
            converter = new CodeConverterNone(fromSet, toSet);
        } else {
            //
            // Shortcut for UTF-16 / UCS-2, and UTF-8 / ISOLATIN1
            //
            if ((toSet.rgy_value == UTF16 || toSet.rgy_value == UCS2)
                    && (fromSet.rgy_value == UTF16 || fromSet.rgy_value == UCS2)) {
                converter = new CodeConverterSimple(fromSet, toSet);
            } else if (((toSet.rgy_value == UTF8 || toSet.rgy_value == ISOLATIN1) && fromSet.rgy_value == UTF8)
                    || (toSet.rgy_value == UTF8 && fromSet.rgy_value == ISOLATIN1)) {
                converter = new CodeConverterSimple(fromSet, toSet);
            } else {
                //
                // Create new converter and add it to the converter list.
                // No conversion to/from ISOLATIN1 and to/from UCS2.
                //
                CharMapInfo fromMap = null;
                CharMapInfo toMap = null;

                int fromBase = fromSet.max_bytes == 1 ? ISOLATIN1 : UTF16;
                if (fromSet.rgy_value != fromBase)
                    fromMap = getCharMapInfo(fromSet.rgy_value);

                int toBase = toSet.max_bytes == 1 ? ISOLATIN1 : UTF16;
                if (toSet.rgy_value != toBase)
                    toMap = getCharMapInfo(toSet.rgy_value);

                if (fromMap != null && toMap != null) {
                    converter = new CodeConverterBoth(fromSet, toSet, fromMap,
                            toMap);
                } else if (fromMap != null) {
                    converter = new CodeConverterFrom(fromSet, toSet, fromMap);
                } else if (toMap != null) {
                    converter = new CodeConverterTo(fromSet, toSet, toMap);
                } else {
                    Assert._OB_assert(false);
                }
            }
        }

        return converter;
    }