import com.sun.xml.internal.bind.v2.runtime.property.UnmarshallerChain; //导入依赖的package包/类
public Loader getLoader(JAXBContextImpl context, boolean typeSubstitutionCapable) {
    if(loader==null) {
        // this has to be done lazily to avoid cyclic reference issue
        UnmarshallerChain c = new UnmarshallerChain(context);
        QNameMap<ChildLoader> result = new QNameMap<ChildLoader>();
        property.buildChildElementUnmarshallers(c,result);
        if(result.size()==1)
            // for ElementBeanInfoImpl created from RuntimeElementInfo
            this.loader = new IntercepterLoader(result.getOne().getValue().loader);
        else
            // for special ElementBeanInfoImpl only used for marshalling
            this.loader = Discarder.INSTANCE;
    }
    return loader;
}
 

import com.sun.xml.internal.bind.v2.runtime.property.UnmarshallerChain; //导入依赖的package包/类
/**
 * Completes the initialization.
 *
 * <p>
 * To fix the cyclic reference issue, the main part of the initialization needs to be done
 * after a {@link StructureLoader} is set to {@link ClassBeanInfoImpl#loader}.
 */
public void init( JAXBContextImpl context, ClassBeanInfoImpl beanInfo, Accessor<?,Map<QName,String>> attWildcard) {
    UnmarshallerChain chain = new UnmarshallerChain(context);
    for (ClassBeanInfoImpl bi = beanInfo; bi != null; bi = bi.superClazz) {
        for (int i = bi.properties.length - 1; i >= 0; i--) {
            Property p = bi.properties[i];

            switch(p.getKind()) {
            case ATTRIBUTE:
                if(attUnmarshallers==null)
                    attUnmarshallers = new QNameMap<TransducedAccessor>();
                AttributeProperty ap = (AttributeProperty) p;
                attUnmarshallers.put(ap.attName.toQName(),ap.xacc);
                break;
            case ELEMENT:
            case REFERENCE:
            case MAP:
            case VALUE:
                p.buildChildElementUnmarshallers(chain,childUnmarshallers);
                break;
            }
        }
    }

    this.frameSize = chain.getScopeSize();

    textHandler = childUnmarshallers.get(StructureLoaderBuilder.TEXT_HANDLER);
    catchAll = childUnmarshallers.get(StructureLoaderBuilder.CATCH_ALL);

    if(attWildcard!=null) {
        attCatchAll = (Accessor<Object,Map<QName,String>>) attWildcard;
        // we use attUnmarshallers==null as a sign to skip the attribute processing
        // altogether, so if we have an att wildcard we need to have an empty qname map.
        if(attUnmarshallers==null)
            attUnmarshallers = EMPTY;
    } else {
        attCatchAll = null;
    }
}