InstructionGenerator.java 文件源码

@SuppressWarnings("unchecked")
static public Generator<ParseTree> getGenerator(ParseTree ctx) throws OrcaException {
    Class<?> klass = ctx.getClass();
    Generator<ParseTree> generator = _generatorByName.get(klass);
    if (generator == null) {
        String key = StringUtils.removeStart(klass.getSimpleName(), "MysqlParser$");
        key = StringUtils.removeEnd(key, "Context");
        key += "Generator";
        try {
            key = InstructionGenerator.class.getPackage().getName() + "." + key;
            Class<?> generatorClass = Class.forName(key);
            generator = (Generator<ParseTree>)generatorClass.newInstance();
            _generatorByName.put(klass, generator);
        }
        catch (Exception x) {
            throw new OrcaException("instruction geneartor is not found: " + key, x);
        }
    }
    return generator;
}