How to use

org.h2.expression.JavaFunction

constructor

private JavaFunction readJavaFunction(Schema schema, String functionName) {
  FunctionAlias functionAlias = null;
  if (schema != null) {
    functionAlias = schema.findFunction(functionName);
  } else {
    functionAlias = findFunctionAlias(session.getCurrentSchemaName(),
        functionName);
  }
  if (functionAlias == null) {
    throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, functionName);
  }
  Expression[] args;
  ArrayList<Expression> argList = New.arrayList();
  int numArgs = 0;
  while (!readIf(")")) {
    if (numArgs++ > 0) {
      read(",");
    }
    argList.add(readExpression());
  }
  args = argList.toArray(new Expression[0]);
  return new JavaFunction(functionAlias, args);
}

private Expression readFunctionWithoutParameters(String name) {
  if (readIf("(")) {
    read(")");
  }
  if (database.isAllowBuiltinAliasOverride()) {
    FunctionAlias functionAlias = database.getSchema(session.getCurrentSchemaName()).findFunction(name);
    if (functionAlias != null) {
      return new JavaFunction(functionAlias, new Expression[0]);
    }
  }
  Function function = Function.getFunction(database, name);
  function.doneWithParameters();
  return function;
}

  r = new JavaFunction(f, args);
} else {
  Column col = parseColumnWithType(null);

private JavaFunction readJavaFunction(Schema schema, String functionName) {
  FunctionAlias functionAlias = null;
  if (schema != null) {
    functionAlias = schema.findFunction(functionName);
  } else {
    functionAlias = findFunctionAlias(session.getCurrentSchemaName(),
        functionName);
  }
  if (functionAlias == null) {
    throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, functionName);
  }
  Expression[] args;
  ArrayList<Expression> argList = New.arrayList();
  int numArgs = 0;
  while (!readIf(")")) {
    if (numArgs++ > 0) {
      read(",");
    }
    argList.add(readExpression());
  }
  args = new Expression[numArgs];
  argList.toArray(args);
  JavaFunction func = new JavaFunction(functionAlias, args);
  return func;
}

private JavaFunction readJavaFunction(Schema schema, String functionName) {
  FunctionAlias functionAlias = null;
  if (schema != null) {
    functionAlias = schema.findFunction(functionName);
  } else {
    functionAlias = findFunctionAlias(session.getCurrentSchemaName(),
        functionName);
  }
  if (functionAlias == null) {
    throw DbException.get(ErrorCode.FUNCTION_NOT_FOUND_1, functionName);
  }
  Expression[] args;
  ArrayList<Expression> argList = New.arrayList();
  int numArgs = 0;
  while (!readIf(")")) {
    if (numArgs++ > 0) {
      read(",");
    }
    argList.add(readExpression());
  }
  args = new Expression[numArgs];
  argList.toArray(args);
  JavaFunction func = new JavaFunction(functionAlias, args);
  return func;
}

private JavaFunction readJavaFunction(String name) throws SQLException {
  FunctionAlias functionAlias = database.findFunctionAlias(name);
  if (functionAlias == null) {
    // TODO compatibility: support 'on the fly java functions' as HSQLDB
    // ( CALL "java.lang.Math.sqrt"(2.0) )
    throw Message.getSQLException(ErrorCode.FUNCTION_NOT_FOUND_1, name);
  }
  int paramCount = functionAlias.getParameterCount();
  Expression[] args = new Expression[paramCount];
  for (int i = 0; i < args.length; i++) {
    if (i > 0) {
      read(",");
    }
    args[i] = readExpression();
  }
  read(")");
  JavaFunction func = new JavaFunction(functionAlias, args);
  return func;
}

  JavaFunction func = new JavaFunction(f, args);
  r = func;
} else {

  JavaFunction func = new JavaFunction(f, args);
  r = func;
} else {