package com.happy.Until.weixin;

import org.apache.commons.lang.StringUtils;

import javax.xml.bind.*;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/** 
 * 使用Jaxb2.0实现XML<->Java Object的Binder. 
 *  
 * 特别支持Root对象是List的情形. 
 *  
 * @author 
 */  
public class JaxbUtil {  
    // 多线程安全的Context.  
    private JAXBContext jaxbContext;  
  
    /** 
     * @param types 
     *            所有需要序列化的Root对象的类型. 
     */  
    public JaxbUtil(Class<?>... types) {  
        try {  
            jaxbContext = JAXBContext.newInstance(types);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Java Object->Xml. 
     */  
    public String toXml(Object root, String encoding) {  
        try {  
            StringWriter writer = new StringWriter();  
            createMarshaller(encoding).marshal(root, writer);  
            return writer.toString();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Java Object->Xml, 特别支持对Root Element是Collection的情形. 
     */  
    @SuppressWarnings("unchecked")  
    public String toXml(Collection root, String rootName, String encoding) {  
        try {  
            CollectionWrapper wrapper = new CollectionWrapper();  
            wrapper.collection = root;  
  
            JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(  
                    new QName(rootName), CollectionWrapper.class, wrapper);  
  
            StringWriter writer = new StringWriter();  
            createMarshaller(encoding).marshal(wrapperElement, writer);  
  
            return writer.toString();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Xml->Java Object. 
     */  
    @SuppressWarnings("unchecked")  
    public <T> T fromXml(String xml) {  
        try {  
            StringReader reader = new StringReader(xml);  
            return (T) createUnmarshaller().unmarshal(reader);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Xml->Java Object, 支持大小写敏感或不敏感. 
     */  
    @SuppressWarnings("unchecked")  
    public <T> T fromXml(String xml, boolean caseSensitive) {  
        try {  
            String fromXml = xml;  
            if (!caseSensitive)  
                fromXml = xml.toLowerCase();  
            StringReader reader = new StringReader(fromXml);  
            return (T) createUnmarshaller().unmarshal(reader);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 创建Marshaller, 设定encoding(可为Null). 
     */  
    public Marshaller createMarshaller(String encoding) {  
        try {  
            Marshaller marshaller = jaxbContext.createMarshaller();  
  
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);  
  
            if (StringUtils.isNotBlank(encoding)) {  
                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);  
            }  
            return marshaller;  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 创建UnMarshaller. 
     */  
    public Unmarshaller createUnmarshaller() {  
        try {  
            return jaxbContext.createUnmarshaller();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 封装Root Element 是 Collection的情况. 
     */  
    public static class CollectionWrapper {  
        @SuppressWarnings("unchecked")  
        @XmlAnyElement  
        protected Collection collection;  
    }
    /**
     * 把map转换成xml格式
     * @param params
     * @return
     * @throws Exception
     */
    public static String getRequestXml(Map<String, String> params) throws Exception{
        StringBuffer sb = new StringBuffer();
        sb.append("<xml>");
        Set<Entry<String, String>> es = params.entrySet();
        Iterator<Entry<String, String>> it = es.iterator();
        while (it.hasNext()) {
            Entry<String, String> entry = (Entry<String, String>) it
                    .next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k)) {
                sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
            } else {
                sb.append("<" + k + ">" + v + "</" + k + ">");
            }
        }
        sb.append("</xml>");
        return new String(sb.toString().toString().getBytes(), "utf-8");
    }
}