xuxiuxi

2017-07-21 ec544e9cc330ce40aeb78e96aa362e245feecd4d

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package com.awsle.aibatis.xml.engine.converters.composite; 
 
import com.awsle.aibatis.xml.engine.alias.ClassMapper; 
import com.awsle.aibatis.xml.engine.converters.Converter; 
import com.awsle.aibatis.xml.engine.converters.ConverterLookup; 
import com.awsle.aibatis.xml.engine.objecttree.ObjectTree; 
import com.awsle.aibatis.xml.engine.xml.XMLReader; 
import com.awsle.aibatis.xml.engine.xml.XMLWriter; 
 
public class ObjectWithFieldsConverter implements Converter { 
 
    private ClassMapper classMapper; 
 
    public ObjectWithFieldsConverter(ClassMapper classMapper) { 
        this.classMapper = classMapper; 
    } 
 
    public boolean canConvert(Class type) { 
        return true; 
    } 
 
    public void toXML(ObjectTree objectGraph, XMLWriter xmlWriter, ConverterLookup converterLookup) { 
        String[] fieldNames = objectGraph.fieldNames(); 
        for (int i = 0; i < fieldNames.length; i++) { 
            String fieldName = fieldNames[i]; 
 
            objectGraph.push(fieldName); 
 
            if (objectGraph.get() != null) { 
                writeFieldAsXML(xmlWriter, fieldName, objectGraph, converterLookup); 
            } 
 
            objectGraph.pop(); 
        } 
    } 
 
    private void writeFieldAsXML(XMLWriter xmlWriter, String fieldName, ObjectTree objectGraph, ConverterLookup converterLookup) { 
        xmlWriter.startElement(fieldName); 
 
        writeClassAttributeInXMLIfNotDefaultImplementation(objectGraph, xmlWriter); 
        Converter converter = converterLookup.lookupConverterForType(objectGraph.type()); 
        converter.toXML(objectGraph, xmlWriter, converterLookup); 
 
        xmlWriter.endElement(); 
    } 
 
    protected void writeClassAttributeInXMLIfNotDefaultImplementation(ObjectTree objectGraph, XMLWriter xmlWriter) { 
        Class actualType = objectGraph.get().getClass(); 
        Class defaultType = classMapper.lookupDefaultType(objectGraph.type()); 
        if (!actualType.equals(defaultType)) { 
            xmlWriter.addAttribute("class", classMapper.lookupName(actualType)); 
        } 
    } 
 
    public void fromXML(final ObjectTree objectGraph, XMLReader xmlReader, ConverterLookup converterLookup, Class requiredType) { 
        objectGraph.create(requiredType); 
        String[] fieldNames = objectGraph.fieldNames(); 
        for (int i = 0; i < fieldNames.length; i++) { 
            String fieldName = fieldNames[i]; 
            if (xmlReader.childExists(fieldName)) { 
                objectGraph.push(fieldName); 
                xmlReader.child(fieldName); 
 
                Class type = determineWhichImplementationToUse(xmlReader, objectGraph); 
                Converter converter = converterLookup.lookupConverterForType(type); 
                converter.fromXML(objectGraph, xmlReader, converterLookup, type); 
 
                xmlReader.pop(); 
                objectGraph.pop(); 
            } 
        } 
    } 
 
    private Class determineWhichImplementationToUse(XMLReader xmlReader, final ObjectTree objectGraph) { 
        String classAttribute = xmlReader.attribute("class"); 
        Class type; 
        if (classAttribute == null) { 
            type = objectGraph.type(); 
        } else { 
            type = classMapper.lookupType(classAttribute); 
        } 
        return type; 
    } 
 
}