java - 两个相关的枚举映射？

Question

我有两个相关的枚举。

枚举 1:

public enum HttpMethodName 
{
    GET, POST, PUT, DELETE; 
}

枚举2:

public enum ProtocolOperation {
    CREATE(1), RETRIEVE(2), UPDATE(3), DELETE(4), NOTIFY(5);


    private BigInteger operationId;

    public BigInteger getOperationId() {
        return operationId;
    }

    private ProtocolOperation(int operationId) {
        this.operationId = BigInteger.valueOf(operationId);
    }
}

枚举值映射为:

Create--> POST
Retrieve--> GET
Update--> PUT
Delete--> DELETE
Notify---> POST

所以除了POST之外，值之间存在一对一的映射。可以有两个值的情况 Create或 Notify基于条件。

我正在考虑将映射保留为 List :

    public enum HttpMethodName 
    {

        POST(new List(ProtocolOperation.CREATE, ProtocolOperation.NOTIFY)) ,GET ( new List(ProtocolOperation.RETRIEVE) ) ,
PUT (new List(ProtocolOperation.UPDATE) ,DELETE(new List(ProtocolOperation.DELETE) ;

        List<ProtocolOperation > ops;
        HttpMethodName (List<ProtocolOperation> ops)
        {
            this.ops = ops;
        }
    }

有没有更好的方法？？

编辑:

我想从 HttpMethodName <----> ProtocolOperation 映射两种方式

Answer 1

为什么您觉得目前的方法不尽如人意？

在不了解您的担忧的情况下，我只能建议删除样板文件:

import static ProtocolOperation.*;

public enum HttpMethodName {
    GET(RETRIEVE),
    POST(CREATE, NOTIFY),
    PUT(UPDATE),
    DELETE(ProtocolOperation.DELETE);

    final List<ProtocolOperation> ops;

    HttpMethodName(ProtocolOperation... ops) {
        this.ops = Collections.unmodifiableList(Arrays.asList(ops));
    }
}

更新:

如果你想以两种方式进行映射，首先硬编码从 ProtocolOperation 到 HttpMethodName 的映射是有意义的(因为它不需要列表)并创建一个MttpMethodName 中的简单搜索方法:

public enum ProtocolOperation {
    CREATE(1, HttpMethodName.POST),
    RETRIEVE(2, HttpMethodName.GET),
    UPDATE(3, HttpMethodName.PUT),
    DELETE(4, HttpMethodName.DELETE),
    NOTIFY(5, HttpMethodName.POST);

    private BigInteger operationId;
    private HttpMethodName methodName;

    public BigInteger getOperationId() {
        return operationId;
    }

    public HttpMethodName getMethodName() {
        return methodName;
    }

    private ProtocolOperation(int operationId, HttpMethodName httpMethodName) {
        this.methodName = httpMethodName;
        this.operationId = BigInteger.valueOf(operationId);
    }
}

public enum HttpMethodName {
    GET,
    POST,
    PUT,
    DELETE;

    List<ProtocolOperation> getProtocolOperations() {
        List<ProtocolOperation> ops = new ArrayList<ProtocolOperation>(2);
        for (ProtocolOperation op : ProtocolOperation.values()) {
            if (op.getMethodName() == this) {
                ops.add(op);
            }
        }
        return ops;
    }
}

由于您有常数和少量值，您不需要在 HttpMethodName 中创建最终静态映射来提供向后映射，线性搜索对于您的情况来说足够快。