0

java.util.Map を POJO にマップするにはどうすればよいですか?

次のテストでは、構成エラーが発生します。

同様の問題が開かれたようですが、解決されませんでしたhttps://github.com/jhalterman/modelmapper/issues/116。

テスト：

package org.me.modelmapper;

import java.util.HashMap;
import org.modelmapper.ModelMapper;
import org.modelmapper.PropertyMap;
import org.testng.Assert;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

public class MapperTest {


    private ModelMapper modelMapper;


    public MapperTest() {
    }


    public static class Foo {

        public String a;
        public String b;

        public String getA() {
            return a;
        }

        public void setA(String a) {
            this.a = a;
        }

        public String getB() {
            return b;
        }

        public void setB(String b) {
            this.b = b;
        }

    }


    @BeforeMethod
    public void setUpMethod() throws Exception {
        modelMapper = new ModelMapper();
        modelMapper.getConfiguration()
                .setFieldMatchingEnabled(true);
    }

    @Test
    public void shouldMapHashMapToFoo() {
        HashMap<String, String> map = new HashMap<>();
        map.put("a", "aaaa");
        map.put("b", "bbbb");

        PropertyMap<HashMap<String, String>, Foo> fooMap = new PropertyMap<HashMap<String, String>, MapperTest.Foo>() {

            @Override
            protected void configure() {
                map(source.get("a"), destination.a);
                map(source.get("b"), destination.b);
            }

        };

        modelMapper.addMappings(fooMap);

        Foo foo = modelMapper.map(map, Foo.class);

        Assert.assertEquals(foo.getA(), map.get("a"));
        Assert.assertEquals(foo.getB(), map.get("b"));

    }

}

エラー：

Configuring TestNG with: org.apache.maven.surefire.testng.conf.TestNG652Configurator@60acc399
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 2.326 sec <<< FAILURE!
shouldMapHashMapToFoo(org.me.modelmapper.MapperTest)  Time elapsed: 0.186 sec  <<< FAILURE!
org.modelmapper.ConfigurationException: ModelMapper configuration errors:

1) Invalid source method java.util.HashMap.get(). Ensure that method has zero parameters and does not return void.

2) Invalid source method java.util.HashMap.get(). Ensure that method has zero parameters and does not return void.

2 errors
    at org.modelmapper.internal.Errors.throwConfigurationExceptionIfErrorsExist(Errors.java:241)
    at org.modelmapper.internal.ExplicitMappingBuilder.visitPropertyMap(ExplicitMappingBuilder.java:228)
    at org.modelmapper.PropertyMap.configure(PropertyMap.java:380)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.modelmapper.internal.ExplicitMappingBuilder.build(ExplicitMappingBuilder.java:194)
    at org.modelmapper.internal.TypeMapImpl.addMappings(TypeMapImpl.java:72)
    at org.modelmapper.internal.TypeMapStore.getOrCreate(TypeMapStore.java:101)
    at org.modelmapper.ModelMapper.addMappings(ModelMapper.java:93)
    at org.me.modelmapper.MapperTest.shouldMapHashMapToFoo(MapperTest.java:354)


Results :

Failed tests:   shouldMapHashMapToFoo(org.me.modelmapper.MapperTest): ModelMapper configuration errors:
(..)

Tests run: 1, Failures: 1, Errors: 0, Skipped: 0
4

2 に答える 2

11

自動的にマッピングされます。マッピングを構成する必要はありません。これはうまくいきます：

@Test
public void shouldMapHashMapToFoo() {
    HashMap<String, String> map = new HashMap<>();
    map.put("a", "aaaa");
    map.put("b", "bbbb");

    Foo foo = modelMapper.map(map, Foo.class);

    Assert.assertEquals(foo.getA(), map.get("a"));
    Assert.assertEquals(foo.getB(), map.get("b"));

}

編集: HashMap をより複雑な構造にマップする必要がある場合は、いつでも「中間」クラスを使用できます。

  public static class Bar
  {
    private String Z;
    private String W;

    public String getZ()
    {
      return Z;
    }

    public void setZ(String z)
    {
      Z = z;
    }

    public String getW()
    {
      return W;
    }

    public void setW(String w)
    {
      W = w;
    }
  }

  @Test
  public void shouldMapHashMapToFoo()
  {
    HashMap<String, String> map = new HashMap<>();
    map.put("z", "aaaa");
    map.put("w", "bbbb");

    Bar bar = modelMapper.map(map, Bar.class);

    PropertyMap<Bar, Foo> barToFooMap = new PropertyMap<Bar, Foo>()
    {
      @Override
      protected void configure()
      {
        map().setA(source.getZ());
        map().setB(source.getW());
      }

    };
    modelMapper.addMappings(barToFooMap);

    Foo foo = modelMapper.map(bar, Foo.class);

    Assert.assertEquals(foo.getA(), map.get("z"));
    Assert.assertEquals(foo.getB(), map.get("w"));
  }
于 2014-09-26T08:44:41.080 に答える