XMLAdapter para HashMap

Question

Quiero convertir una lista de elementos dentro de mi payaload y convertirlos en un hashmap. Básicamente, lo que tengo es una representación de Item xml que tiene una lista de ItemID. Cada ID de elemento tiene un idType. Sin embargo, dentro de mi clase Item, quiero que estos ItemIDs se representen como un Mapa.

HashMap<ItemIDType, ItemID> 

La carga útil entrante representará esto como una lista

<Item>... 
    <ItemIDs> 
     <ItemID type="external" id="XYZ"/> 
     <ItemID type="internal" id="20011"/> 
    </ItemIDs> 
</Item> 

pero quiero un adaptador que se va a convertir esto en un HashMap

"external" => "xyz" 
"internal" => "20011" 

estoy ahora usando un LinkedList

public class MapHashMapListAdapter extends XmlAdapter<LinkedList<ItemID>, Map<ItemIDType, ItemID>> { 

    public LinkedList<ItemID> marshal(final Map<ItemIDType, ItemID> v) throws Exception { ... } 

    public Map<ItemIDType, ItemID> unmarshal(final LinkedList<ItemID> v) throws Exception { ... } 

} 

pero por alguna razón cuando mi carga útil se convierte, no puede convertir la lista en un hashmap. La LinkedList entrante del método unmarshal es una lista vacía. ¿Ustedes tienen alguna idea de lo que estoy haciendo mal aquí? ¿Necesito crear mi propio tipo de datos aquí para manejar LinkedList?

Answer 1

En lugar de convertir el Map en un LinkedList, necesita convertirlo en un objeto de dominio.

import java.util.HashMap; 
import java.util.Map; 
import java.util.Map.Entry; 
import javax.xml.bind.annotation.adapters.XmlAdapter; 

public final class MyMapAdapter extends 

    XmlAdapter<MyMapType,Map<Integer, String>> { 

    @Override 
    public MyMapType marshal(Map<Integer, String> arg0) throws Exception { 
     MyMapType myMapType = new MyMapType(); 
     for(Entry<Integer, String> entry : arg0.entrySet()) { 
     MyMapEntryType myMapEntryType = 
      new MyMapEntryType(); 
     myMapEntryType.key = entry.getKey(); 
     myMapEntryType.value = entry.getValue(); 
     myMapType.entry.add(myMapEntryType); 
     } 
     return myMapType; 
    } 

    @Override 
    public Map<Integer, String> unmarshal(MyMapType arg0) throws Exception { 
     HashMap<Integer, String> hashMap = new HashMap<Integer, String>(); 
     for(MyMapEntryType myEntryType : arg0.entry) { 
     hashMap.put(myEntryType.key, myEntryType.value); 
     } 
     return hashMap; 
    } 

} 

Para más información

• http://blog.bdoughan.com/2010/07/xmladapter-jaxbs-secret-weapon.html

Answer 2

Puede hacer referencia a la documentación oficial de Oracle aquí: XmlAdapter. Han dado un ejemplo similar para HashMap.

Answer 3

Puede usar mi antigua solución universal, , pero nunca lo haga en el proyecto real, no es un idioma cruzado (solo para el cliente java + solución de servidor java). SerializableAdapler.java puede reunir y desmantelar cualquier objeto Java. Para ordenarlo, serializa el objeto java en Cadena y luego lo codifica en base64. Para desasociar, decodifica la cadena base64 y la deserializa para obtener el objeto java. Por cierto, en esta solución necesitas ayudantes (SerializableAdapler.java, Base64Coder.java) tanto en el servidor como en el lado del cliente. En la solución normal, solo necesita una interfaz como SomeService.java en el lado del cliente (y tanto SomeService.java como SomeServiceImpl.java en el lado del servidor). Lo probé con http://cxf.apache.org/docs/a-simple-jax-ws-service.html, pero puede usar otro marco de servicios web.

SomeService.java

package some.services.interfaces; 

import some.services.interfaces.helpers.SerializableAdapler; 

import javax.jws.WebParam; 
import javax.jws.WebService; 
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; 
import java.util.List; 
import java.util.Map; 

@WebService 
public interface SomeService { 
    String sayHi(@WebParam(name = "text") String text); 

    String sayHiToUser(@WebParam(name = "user") String user); 

    /* Advanced usecase of passing an Interface in. JAX-WS/JAXB does not 
    * support interfaces directly. Special XmlAdapter classes need to 
    * be written to handle them 
    */ 
    boolean add(@XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "data") Map<String, String> data); 

    boolean addAll(@XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "columns") List<String> columns, @XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "datas") List<List<String>> datas); 

    @XmlJavaTypeAdapter(SerializableAdapler.class) 
    List<String> showColumns(); 

    @XmlJavaTypeAdapter(SerializableAdapler.class) 
    List<List<String>> getDatas(); 
} 

SerializableAdapler.java

package some.services.interfaces.helpers; 

import javax.xml.bind.annotation.adapters.XmlAdapter; 
import java.io.*; 

public class SerializableAdapler<BoundType> extends XmlAdapter<String,BoundType> { 
    @Override 
    public BoundType unmarshal(String v) throws Exception { 
     byte [] data = Base64Coder.decode(v); 
     ObjectInputStream ois = new ObjectInputStream(
       new ByteArrayInputStream( data)); 

     BoundType o = (BoundType)ois.readObject(); 
     ois.close(); 
     return o; 
    } 

    @Override 
    public String marshal(BoundType v) throws Exception { 
     if (v instanceof Serializable) { 
      ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
      ObjectOutputStream oos = new ObjectOutputStream(baos); 
      oos.writeObject(v); 
      oos.close(); 
      return new String(Base64Coder.encode(baos.toByteArray())); 
     } else { 
      throw new Exception("BoundType v is not serializable: "+v.getClass()); 
     } 
    } 
} 

Base64Coder.java

package some.services.interfaces.helpers; 

// Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland 
// www.source-code.biz, www.inventec.ch/chdh 
// 
// This module is multi-licensed and may be used under the terms 
// of any of the following licenses: 
// 
// EPL, Eclipse Public License, V1.0 or later, http://www.eclipse.org/legal 
// LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html 
// GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html 
// AGPL, GNU Affero General Public License V3 or later, http://www.gnu.org/licenses/agpl.html 
// AL, Apache License, V2.0 or later, http://www.apache.org/licenses 
// BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php 
// MIT, MIT License, http://www.opensource.org/licenses/MIT 
// 
// Please contact the author if you need another license. 
// This module is provided "as is", without warranties of any kind. 
// 
// Project home page: www.source-code.biz/base64coder/java 

/** 
* A Base64 encoder/decoder. 
* 
* <p> 
* This class is used to encode and decode data in Base64 format as described in RFC 1521. 
* 
* @author 
* Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland, www.source-code.biz 
*/ 
public class Base64Coder { 

    // The line separator string of the operating system. 
    private static final String systemLineSeparator = System.getProperty("line.separator"); 

    // Mapping table from 6-bit nibbles to Base64 characters. 
    private static final char[] map1 = new char[64]; 
    static { 
     int i=0; 
     for (char c='A'; c<='Z'; c++) map1[i++] = c; 
     for (char c='a'; c<='z'; c++) map1[i++] = c; 
     for (char c='0'; c<='9'; c++) map1[i++] = c; 
     map1[i++] = '+'; map1[i++] = '/'; } 

    // Mapping table from Base64 characters to 6-bit nibbles. 
    private static final byte[] map2 = new byte[128]; 
    static { 
     for (int i=0; i<map2.length; i++) map2[i] = -1; 
     for (int i=0; i<64; i++) map2[map1[i]] = (byte)i; } 

    /** 
    * Encodes a string into Base64 format. 
    * No blanks or line breaks are inserted. 
    * @param s A String to be encoded. 
    * @return A String containing the Base64 encoded data. 
    */ 
    public static String encodeString (String s) { 
     return new String(encode(s.getBytes())); } 

    /** 
    * Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters. 
    * This method is compatible with <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>. 
    * @param in An array containing the data bytes to be encoded. 
    * @return A String containing the Base64 encoded data, broken into lines. 
    */ 
    public static String encodeLines (byte[] in) { 
     return encodeLines(in, 0, in.length, 76, systemLineSeparator); } 

    /** 
    * Encodes a byte array into Base 64 format and breaks the output into lines. 
    * @param in   An array containing the data bytes to be encoded. 
    * @param iOff   Offset of the first byte in <code>in</code> to be processed. 
    * @param iLen   Number of bytes to be processed in <code>in</code>, starting at <code>iOff</code>. 
    * @param lineLen  Line length for the output data. Should be a multiple of 4. 
    * @param lineSeparator The line separator to be used to separate the output lines. 
    * @return    A String containing the Base64 encoded data, broken into lines. 
    */ 
    public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) { 
     int blockLen = (lineLen*3)/4; 
     if (blockLen <= 0) throw new IllegalArgumentException(); 
     int lines = (iLen+blockLen-1)/blockLen; 
     int bufLen = ((iLen+2)/3)*4 + lines*lineSeparator.length(); 
     StringBuilder buf = new StringBuilder(bufLen); 
     int ip = 0; 
     while (ip < iLen) { 
      int l = Math.min(iLen-ip, blockLen); 
      buf.append(encode(in, iOff+ip, l)); 
      buf.append(lineSeparator); 
      ip += l; } 
     return buf.toString(); } 

    /** 
    * Encodes a byte array into Base64 format. 
    * No blanks or line breaks are inserted in the output. 
    * @param in An array containing the data bytes to be encoded. 
    * @return A character array containing the Base64 encoded data. 
    */ 
    public static char[] encode (byte[] in) { 
     return encode(in, 0, in.length); } 

    /** 
    * Encodes a byte array into Base64 format. 
    * No blanks or line breaks are inserted in the output. 
    * @param in An array containing the data bytes to be encoded. 
    * @param iLen Number of bytes to process in <code>in</code>. 
    * @return  A character array containing the Base64 encoded data. 
    */ 
    public static char[] encode (byte[] in, int iLen) { 
     return encode(in, 0, iLen); } 

    /** 
    * Encodes a byte array into Base64 format. 
    * No blanks or line breaks are inserted in the output. 
    * @param in An array containing the data bytes to be encoded. 
    * @param iOff Offset of the first byte in <code>in</code> to be processed. 
    * @param iLen Number of bytes to process in <code>in</code>, starting at <code>iOff</code>. 
    * @return  A character array containing the Base64 encoded data. 
    */ 
    public static char[] encode (byte[] in, int iOff, int iLen) { 
     int oDataLen = (iLen*4+2)/3;  // output length without padding 
     int oLen = ((iLen+2)/3)*4;   // output length including padding 
     char[] out = new char[oLen]; 
     int ip = iOff; 
     int iEnd = iOff + iLen; 
     int op = 0; 
     while (ip < iEnd) { 
      int i0 = in[ip++] & 0xff; 
      int i1 = ip < iEnd ? in[ip++] & 0xff : 0; 
      int i2 = ip < iEnd ? in[ip++] & 0xff : 0; 
      int o0 = i0 >>> 2; 
      int o1 = ((i0 & 3) << 4) | (i1 >>> 4); 
      int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6); 
      int o3 = i2 & 0x3F; 
      out[op++] = map1[o0]; 
      out[op++] = map1[o1]; 
      out[op] = op < oDataLen ? map1[o2] : '='; op++; 
      out[op] = op < oDataLen ? map1[o3] : '='; op++; } 
     return out; } 

    /** 
    * Decodes a string from Base64 format. 
    * No blanks or line breaks are allowed within the Base64 encoded input data. 
    * @param s A Base64 String to be decoded. 
    * @return A String containing the decoded data. 
    * @throws IllegalArgumentException If the input is not valid Base64 encoded data. 
    */ 
    public static String decodeString (String s) { 
     return new String(decode(s)); } 

    /** 
    * Decodes a byte array from Base64 format and ignores line separators, tabs and blanks. 
    * CR, LF, Tab and Space characters are ignored in the input data. 
    * This method is compatible with <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>. 
    * @param s A Base64 String to be decoded. 
    * @return An array containing the decoded data bytes. 
    * @throws IllegalArgumentException If the input is not valid Base64 encoded data. 
    */ 
    public static byte[] decodeLines (String s) { 
     char[] buf = new char[s.length()]; 
     int p = 0; 
     for (int ip = 0; ip < s.length(); ip++) { 
      char c = s.charAt(ip); 
      if (c != ' ' && c != '\r' && c != '\n' && c != '\t') 
       buf[p++] = c; } 
     return decode(buf, 0, p); } 

    /** 
    * Decodes a byte array from Base64 format. 
    * No blanks or line breaks are allowed within the Base64 encoded input data. 
    * @param s A Base64 String to be decoded. 
    * @return An array containing the decoded data bytes. 
    * @throws IllegalArgumentException If the input is not valid Base64 encoded data. 
    */ 
    public static byte[] decode (String s) { 
     return decode(s.toCharArray()); } 

    /** 
    * Decodes a byte array from Base64 format. 
    * No blanks or line breaks are allowed within the Base64 encoded input data. 
    * @param in A character array containing the Base64 encoded data. 
    * @return An array containing the decoded data bytes. 
    * @throws IllegalArgumentException If the input is not valid Base64 encoded data. 
    */ 
    public static byte[] decode (char[] in) { 
     return decode(in, 0, in.length); } 

    /** 
    * Decodes a byte array from Base64 format. 
    * No blanks or line breaks are allowed within the Base64 encoded input data. 
    * @param in A character array containing the Base64 encoded data. 
    * @param iOff Offset of the first character in <code>in</code> to be processed. 
    * @param iLen Number of characters to process in <code>in</code>, starting at <code>iOff</code>. 
    * @return  An array containing the decoded data bytes. 
    * @throws  IllegalArgumentException If the input is not valid Base64 encoded data. 
    */ 
    public static byte[] decode (char[] in, int iOff, int iLen) { 
     if (iLen%4 != 0) throw new IllegalArgumentException("Length of Base64 encoded input string is not a multiple of 4."); 
     while (iLen > 0 && in[iOff+iLen-1] == '=') iLen--; 
     int oLen = (iLen*3)/4; 
     byte[] out = new byte[oLen]; 
     int ip = iOff; 
     int iEnd = iOff + iLen; 
     int op = 0; 
     while (ip < iEnd) { 
      int i0 = in[ip++]; 
      int i1 = in[ip++]; 
      int i2 = ip < iEnd ? in[ip++] : 'A'; 
      int i3 = ip < iEnd ? in[ip++] : 'A'; 
      if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127) 
       throw new IllegalArgumentException("Illegal character in Base64 encoded data."); 
      int b0 = map2[i0]; 
      int b1 = map2[i1]; 
      int b2 = map2[i2]; 
      int b3 = map2[i3]; 
      if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0) 
       throw new IllegalArgumentException("Illegal character in Base64 encoded data."); 
      int o0 = (b0  <<2) | (b1>>>4); 
      int o1 = ((b1 & 0xf)<<4) | (b2>>>2); 
      int o2 = ((b2 & 3)<<6) | b3; 
      out[op++] = (byte)o0; 
      if (op<oLen) out[op++] = (byte)o1; 
      if (op<oLen) out[op++] = (byte)o2; } 
     return out; } 

    // Dummy constructor. 
    private Base64Coder() {} 

} // end class Base64Coder 

SomeServiceImpl.java

package some.services.implement; 

import some.services.interfaces.SomeService; 

import javax.jws.WebService; 
import java.util.*; 

@WebService(endpointInterface = "some.services.interfaces.SomeService", 
     serviceName = "SomeService") 
public class SomeServiceImpl implements SomeSerive { 
    public String sayHi(String text) { 
     return "Hi, "+text; 
    } 

    public String sayHiToUser(String user) { 
     return "Hello, "+user; 
    } 

    protected List<String> columns = null; 
    protected final List<List<String>> datas = new LinkedList<List<String>>(); 

    public boolean add(Map<String, String> data) { 
     ... 
    } 

    public boolean addAll(List<String> columns, List<List<String>> datas) { 
     ... 
    } 

    public List<String> showColumns() { 
     ... 
    } 

    public List<List<String>> getDatas() { 
     ... 
    } 
} 

P.S .: Este ejemplo de solución es para Java 7 (sin soporte base64 normal). Por favor, no edite para versiones posteriores de Java.