package act.util;

/*-

* #%L

* ACT Framework

* %%

* Copyright (C) 2014 - 2017 ActFramework

* %%

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

* #L%

*/

import org.osgl.util.*;

import java.lang.annotation.*;

import java.util.HashMap;

import java.util.Map;

/**

* Specify header mapping when loading a list of data

* into a field with {@link act.inject.util.LoadResource}.

*

* Note if the target field type is not a List of data, this

* annotation will be ignored.

*/

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.FIELD)

public @interface HeaderMapping {

/**

* Specify header mapping.

*

* Example: `"# as id,姓 as lastName,名 as firstName"`

*/

String value();

class Parser {

public static Map<String, String> parse(String value) {

if (S.isBlank(value)) {

return C.Map();

}

S.List list = S.fastSplit(value, ",");

Map<String, String> map = new HashMap<>();

for (String part : list) {

part = part.trim();

int pos = part.toLowerCase().indexOf(" as ");

E.illegalArgumentIf(pos < 1, "Illegal mapping specification: " + part);

String src = part.substring(0, pos);

String tgt = part.substring(pos + 4);

map.put(src, tgt);

}

return map;

}

}

}