JAXB: Como suprimir XmlElement ao usar XmlJavaTypeAdapter?
eu uso@XmlJavaTypeAdapter
transformarMap<String, MapItem>
objetos emList<MapItem>
quando marshalling (e vice-versa quando unmarshalling.)
A lista sempre tem um ambiente@XmlElement
e eu quero me livrar disso, já que isso bagunça o XML resultante.
Como isso pode ser feito?
Ou, em outras palavras, como posso me livrar do elementomap
no seguinte XML:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<top>
<map>
<item val="some-val" key="some-key"/>
</map>
</top>
ClasseMapItem
é uma classe simples com uma chave e um valor:public static class MapItem {
@XmlAttribute(name = "key")
String key;
@XmlAttribute(name = "val")
String val;
}
A declaração deMap<String, MapItem>
implícita ou explicitamente contém um@XmlElement
anotação:@XmlJavaTypeAdapter(MyMapItemAdapter.class)
@XmlElement(name = "map")
Map<String, MapItem> map = new TreeMap<String, MapItem>();
As aulas para@XmlJavaTypeAdapter
:@XmlType(name = "map-type", propOrder = { "list" })
static class MyMapItemType {
@XmlElement(name = "item")
List<MapItem> list = new ArrayList<MapItem>();
}
@XmlTransient
static final class MyMapItemAdapter extends
XmlAdapter<MyMapItemType, Map<String, MapItem>> {
MyMapItemAdapter() {
}
@Override
public MyMapItemType marshal(Map<String, MapItem> arg0)
throws Exception {
MyMapItemType myMapType = new MyMapItemType();
for (Entry<String, MapItem> entry : arg0.entrySet()) {
myMapType.list.add(entry.getValue());
}
return myMapType;
}
@Override
public Map<String, MapItem> unmarshal(MyMapItemType arg0)
throws Exception {
TreeMap<String, MapItem> treeMap = new TreeMap<String, MapItem>();
for (MapItem myEntryType : arg0.list) {
treeMap.put(myEntryType.key, myEntryType);
}
return treeMap;
}
}
A declaração de classe superior:@XmlRootElement(name = "top")
@XmlType(name = "top")
@XmlAccessorType(XmlAccessType.FIELD)
public class JaxbMapTest {
Minha aula de teste completa:package xml;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.Map.Entry;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
@XmlRootElement(name = "top")
@XmlType(name = "top")
@XmlAccessorType(XmlAccessType.FIELD)
public class JaxbMapTest {
public static class MapItem {
@XmlAttribute(name = "key")
String key;
@XmlAttribute(name = "val")
String val;
}
@XmlTransient
static final class MyMapItemAdapter extends
XmlAdapter<MyMapItemType, Map<String, MapItem>> {
MyMapItemAdapter() {
}
@Override
public MyMapItemType marshal(Map<String, MapItem> arg0)
throws Exception {
MyMapItemType myMapType = new MyMapItemType();
for (Entry<String, MapItem> entry : arg0.entrySet()) {
myMapType.list.add(entry.getValue());
}
return myMapType;
}
@Override
public Map<String, MapItem> unmarshal(MyMapItemType arg0)
throws Exception {
TreeMap<String, MapItem> treeMap = new TreeMap<String, MapItem>();
for (MapItem myEntryType : arg0.list) {
treeMap.put(myEntryType.key, myEntryType);
}
return treeMap;
}
}
@XmlType(name = "map-type", propOrder = { "list" })
static class MyMapItemType {
@XmlElement(name = "item")
List<MapItem> list = new ArrayList<MapItem>();
}
public static void main(String[] args) {
try {
// Setup object
JaxbMapTest jaxbMapTest = new JaxbMapTest();
MapItem mapItem = new MapItem();
mapItem.key = "some-key";
mapItem.val = "some-val";
jaxbMapTest.add(mapItem);
// Marshal
JAXBContext jaxbContext = JAXBContext
.newInstance(JaxbMapTest.class);
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
Boolean.TRUE);
marshaller.marshal(jaxbMapTest, new File("JaxbMapTest.out"));
// Exit
System.exit(0);
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
@XmlJavaTypeAdapter(MyMapItemAdapter.class)
@XmlElement(name = "map")
Map<String, MapItem> map = new TreeMap<String, MapItem>();
void add(MapItem mapItem) {
map.put(mapItem.key, mapItem);
}
}