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我正在开发一个接受 SOAP 消息的 java 应用程序。SOAP 的主体包含各种文档。他们的数量不时变化（取决于专辑的版本）。

对于他们的分析，我正在尝试应用模式抽象工厂。但是我的实现，我遇到了一个问题：

  IAlbumFactory albumFactory = AlbumFactory.buildDocument (Album.A_5_0_12);

第一个参数有我可以指向任何类型的枚举CustomDocument（虽然CustomDocument.DO1只有有效的Du）。而且这个错误只出现在运行时

  IDocumentEntity <Du, org.w3c.dom.Element> documentEntity =     
  albumFactory.getWorker   (CustomDocument.DO1);

如何避免？

一些类：

public interface IDocumentEntity<T,E> {
T getReport(E e) throws JAXBException ;
}
public interface IAlbumFactory {
IDocumentEntity getWorker(CustomDocument document);
}

/**
 * Class for convert document DO1 (album 5.0.12) from org.w3c.dom.Element to Du
 * entity type
 *
 * @author uas
 */
public class DO1_5_0_12 implements IDocumentEntity<Du, org.w3c.dom.Element> {

protected DO1ReportInType unmarshall(org.w3c.dom.Element e) throws JAXBException {
    DO1ReportInType resultType = null;
    JAXBContext result = JAXBContextHelper_DO1.getJaxbContextInstance();
    Unmarshaller u = result.createUnmarshaller();
    Object c = u.unmarshal(e);
    if (c instanceof JAXBElement) {
        JAXBElement jaxbe = (JAXBElement) c;
        resultType = (DO1ReportInType) JAXBIntrospector.getValue(jaxbe);
    }
    return resultType;
}

@Override
public Du getReport(org.w3c.dom.Element e) throws JAXBException {
    DO1ReportInType dO1Report = unmarshall(e);
    DO1ReportIn_JAXBtoORCL btoORCL = new DO1ReportIn_JAXBtoORCL(dO1Report);
    return btoORCL.getReport();
   }
}

专辑 5_0_12 的工厂。

public class AlbumFactory_5_0_12 implements IAlbumFactory {

/**
 * Return documentWorker byn CustomDocument value
 * @param customDocument
 * @return throws IllegalArgumentException
 */
@Override
public IDocumentEntity getWorker(CustomDocument customDocument) {
    IDocumentEntity doc = null;
    switch (customDocument) {
        case DO1:
            doc = new DO1_5_0_12();
            break;
        case DO2:
            doc = new DO2_5_0_12();
            break;
        default:
            throw new IllegalArgumentException("For album 5.0.12 " +       customDocument.DocName() + " not support");
    }
    return doc;
}

}

public class AlbumFactory {

private AlbumFactory() {
}

public static IAlbumFactory buildDocument(Album album) {
    IAlbumFactory result = null;

    switch (album) {
        case A_5_0_12:
            result = new AlbumFactory_5_0_12();
            break;
        default:
            throw new IllegalArgumentException("This version " + album.AlbumName() + " is not support");

    }

    return result;

}

}

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