import com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl; //导入依赖的package包/类
XMLStreamReader getXMLStreamReaderImpl(XMLInputSource inputSource) throws javax.xml.stream.XMLStreamException{
    //1. if the temp reader is null -- create the instance and return
    if(fTempReader == null){
        fPropertyChanged = false;
        return fTempReader = new XMLStreamReaderImpl(inputSource,
                new PropertyManager(fPropertyManager));
    }
    //if factory is configured to reuse the instance & this instance can be reused
    //& the setProperty() hasn't been called
    if(fReuseInstance && fTempReader.canReuse() && !fPropertyChanged){
        if(DEBUG)System.out.println("Reusing the instance");
        //we can make setInputSource() call reset() and this way there wont be two function calls
        fTempReader.reset();
        fTempReader.setInputSource(inputSource);
        fPropertyChanged = false;
        return fTempReader;
    }else{
        fPropertyChanged = false;
        //just return the new instance.. note that we are not setting  fTempReader to the newly created instance
        return fTempReader = new XMLStreamReaderImpl(inputSource,
                new PropertyManager(fPropertyManager));
    }
}
 

import com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl; //导入依赖的package包/类
public XMLStreamReader createXMLStreamReader(Source source) throws XMLStreamException {
    return new XMLStreamReaderImpl(jaxpSourcetoXMLInputSource(source),
            new PropertyManager(fPropertyManager));
}