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package com.sun.xml.bind.unmarshaller;

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.helpers.ValidationEventImpl;
import javax.xml.bind.helpers.ValidationEventLocatorImpl;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 * Redirects events to another SAX ContentHandler.
 * 
 * @author
 * 	Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 * @since JAXB1.0
 * @deprecated in JAXB1.0.1
 */
public class ContentHandlerExAdaptor extends ContentHandlerEx {
    
    /**
     * This handler will receive SAX events.
     */
    private final ContentHandler handler;

    public ContentHandlerExAdaptor(UnmarshallingContext _ctxt,ContentHandler _handler) {
        // this class don't use the state, but to make the base class happy,
        // we need to pretend that we are always in the state #0.
        super(_ctxt, "-");
        this.handler = _handler;
        
        // emulate the start of documents
        try {
            handler.setDocumentLocator(context.getLocator());
            handler.startDocument();
        } catch( SAXException e ) {
            error(e);
        }
    }

    protected UnmarshallableObject owner() {
        return null;
    }


    // nest level of elements.
    private int depth = 0;
        
    public void enterAttribute(String uri, String local) throws UnreportedException {
    }

    public void enterElement(String uri, String local, Attributes atts) throws UnreportedException {
        depth++;
        // TODO: qname
        try {
            handler.startElement(uri,local,null,atts);
        } catch( SAXException e ) {
            error(e);
        }
    }

    public void leaveAttribute(String uri, String local) throws UnreportedException {
    }

    public void leaveElement(String uri, String local) throws UnreportedException {
        try {
            handler.endElement(uri,local,null); // TODO:qname
        } catch( SAXException e ) {
            error(e);
        }
        
        depth--;
        if(depth==0) {
            // emulate the end of the document
            try {
                handler.endDocument();
            } catch( SAXException e ) {
                error(e);
            }
            context.popContentHandler();
        }
    }

    public void text(String s) throws UnreportedException {
        try {
            handler.characters(s.toCharArray(),0,s.length());
        } catch( SAXException e ) {
            error(e);
        }
    }
    
    private void error( SAXException e ) {
        context.handleEvent(new ValidationEventImpl(
            ValidationEvent.ERROR,
            e.getMessage(),
            new ValidationEventLocatorImpl(context.getLocator()),
            e
        ));
    }
}
