Protostuff序列化对象地图一样<字符串，地图<String，字符串>>

Question

我如何序列化对象喜欢用Protostuff下面的例子：

Map<String, Map<String, String>> 

我知道，我必须使用MapSchema，但我不知道我需要用这个对象来做什么。

Answer 1

类来序列外地图：

public class OuterMapSchema extends MapSchema<String, Map<String, String>> { 

    InnerMapSchema INNER_MAP_SCHEMA = new InnerMapSchema(); 

    public OuterMapSchema() { 
     super(MessageFactories.HashMap); 
    } 

    @Override 
    protected String readKeyFrom(Input input, MapWrapper<String, Map<String, String>> wrapper) throws IOException { 
     return input.readString(); 
    } 

    @Override 
    protected void putValueFrom(Input input, MapWrapper<String, Map<String, String>> wrapper, String key) throws IOException { 
     wrapper.put(key, input.mergeObject(null, INNER_MAP_SCHEMA)); 
    } 

    @Override 
    protected void writeKeyTo(Output output, int fieldNumber, String value, boolean repeated) throws IOException { 
     output.writeString(fieldNumber, value, repeated); 
    } 

    @Override 
    protected void writeValueTo(Output output, int fieldNumber, Map<String, String> value, boolean repeated) throws IOException { 
     output.writeObject(fieldNumber, value, INNER_MAP_SCHEMA, repeated); 

    } 

    @Override 
    protected void transferKey(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException { 

    } 

    @Override 
    protected void transferValue(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException { 

    } 
} 

类来序列内地图：

public class InnerMapSchema extends MapSchema<String, String> { 

    public InnerMapSchema() { 
     super(MessageFactories.HashMap); 
    } 

    @Override 
    protected String readKeyFrom(Input input, MapWrapper<String, String> wrapper) throws IOException { 
     return input.readString(); 

    } 

    @Override 
    protected void putValueFrom(Input input, MapWrapper<String, String> wrapper, String key) throws IOException { 
     wrapper.put(key, input.readString()); 
    } 

    @Override 
    protected void writeKeyTo(Output output, int fieldNumber, String value, boolean repeated) throws IOException { 
     output.writeString(fieldNumber, value, repeated); 
    } 

    @Override 
    protected void writeValueTo(Output output, int fieldNumber, String value, boolean repeated) throws IOException { 
     output.writeString(fieldNumber, value, repeated); 
    } 

    @Override 
    protected void transferKey(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException { 

    } 

    @Override 
    protected void transferValue(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException { 

    } 
}