package com.avaje.tests.xml.runtime;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

import com.avaje.tests.xml.oxm.OxmContext;

public class XrContext implements OxmContext {

    Map<String,XoiNode> tagToNodeMap;
    Map<Class<?>,XoiNode> classToNodeMap;

    public XrContext(Map<String,XoiNode> tagToNodeMap, Map<Class<?>,XoiNode> classToNodeMap) {
        this.tagToNodeMap = tagToNodeMap;
        this.classToNodeMap = classToNodeMap;
    }
    
    public void writeBean(Object bean, Document document) throws IOException {
        
        XoiNode xoiNode =  getXoiNode(bean);
        
        XrOutputDocument out = new XrOutputDocument(document);
        xoiNode.writeNode(out, null, bean);
    }

    public void writeBean(Object bean, Writer writer) throws IOException {
        XoiNode xoiNode = getXoiNode(bean);
        
        XrOutputWriter o = new XrOutputWriter(writer);
        xoiNode.writeNode(o, bean);
    }

    
    
    public Object readBean(Node node) {
        
        XoiNode xoiNode = getXoiNode(node.getNodeName());
        
        Object bean = xoiNode.createBean();
        
        XrReadContext ctx = new XrReadContext(bean);
                
        xoiNode.readNode(node, ctx);
        return ctx.getBean();
    }

    private XoiNode getXoiNode(Object bean) {
        Class<?> cls = bean.getClass();
        XoiNode xoiNode = classToNodeMap.get(cls);
        if (xoiNode == null){
            throw new RuntimeException("No handler for type "+cls);
        } else {
            return xoiNode;
        }
    }
    
    private XoiNode getXoiNode(String nodeName) {
        
        XoiNode xoiNode = tagToNodeMap.get(nodeName);
        if (xoiNode == null){
            throw new RuntimeException("No handler for node "+nodeName);
        } else {
            return xoiNode;
        }
    }
}