com.anysoft.util.resource.ResourceFactory Maven / Gradle / Ivy
package com.anysoft.util.resource;
import java.io.InputStream;
import java.net.URL;
import java.util.Hashtable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import com.anysoft.util.BaseException;
import com.anysoft.util.XmlTools;
import com.anysoft.util.URLocation;
/**
* 资源工厂
*
*
* @author duanyy
* @version 1.6.7.9 [20170201 duanyy]
* - 采用SLF4j日志框架输出日志
*
*/
public class ResourceFactory {
/**
* a logger of log4j
*/
protected static Logger logger = LoggerFactory.getLogger(ResourceFactory.class);
/**
* 装入资源的输入流
*
* 先采用master去装入资源，如果不成功，再尝试用secondary去装入。
*
* @param master 资源的URL
* @param secondary 备用的资源URL
* @param _context 上下文
* @return 输入流
*/
public InputStream load(String master,String secondary,Object _context){
InputStream in = null;
try {
in = load(master,_context);
}catch (BaseException ex){
if (secondary != null && secondary.length() > 0){
logger.error("Can not load xrc,path=" + master, ex);
}else{
throw ex;
}
}
if (in == null && secondary != null && secondary.length() > 0){
logger.info("Can not load master xrc,try secondary xrc...path = " + secondary);
in = load(secondary,_context);
}
return in;
}
/**
* 装入资源的输入流
*
*
* 通过URL中的scheme来识别ResourceLoader。先使用子类提供的{@link #getLoader(String)}来获取ResourceLoader，
* 如果子类没有定义，再从注册的ResourceLoader列表中获取。
*
* 可通过两种方式定制所使用的ResourceLoader
* - 定制ResourceFactory的子类，重载{@link #getLoader(String)}函数，来获取ResourceLoader.
* - 通过{@link #registerLoader(String, Class)}主动注册ResourceLoader.
*
* @param _path 资源的URL
* @param _context 上下文
* @return 输入流
*/
public InputStream load(String _path, Object _context) {
URLocation url = new URLocation(_path);
String scheme = url.hasScheme() ? url.getScheme() : "java";
ResourceLoader loader = getLoader(scheme);
if (loader == null) {
Class _class = loaders.get(scheme);
if (_class != null) {
try {
loader = _class.newInstance();
} catch (Exception ex) {
loader = null;
}
}
}
if (loader == null) {
throw new BaseException(ResourceFactory.class.getName(),
"Can not create ResourceLoader instance:" + _path);
}
return loader.load(url, _context);
}
/**
* 构造函数
*/
public ResourceFactory() {
}
/**
* 生成标准URL
* @param _path 字符串型URL
* @param _context 上下文
* @return URL
*/
public URL createURL(String _path, Object _context) {
URLocation url = new URLocation(_path);
String scheme = url.hasScheme() ? url.getScheme() : "java";
ResourceLoader loader = getLoader(scheme);
if (loader == null) {
Class _class = loaders.get(scheme);
if (_class != null) {
try {
loader = _class.newInstance();
} catch (Exception ex) {
loader = null;
}
}
}
if (loader == null) {
throw new BaseException(ResourceFactory.class.getName(),
"Can not create ResourceLoader instance:" + _path);
}
return loader.createURL(url, _context);
}
/**
* 根据scheme获取ResourceLoader
* @param scheme scheme
* @return ResourceLoader
*/
protected ResourceLoader getLoader(String scheme) {
return null;
}
/**
* 注册全局的ResourceLoader列表
* @param scheme scheme
* @param loader ResourceLoader的Class
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
protected static void registerLoader(String scheme, Class loader) {
loaders.put(scheme, loader);
}
/**
* 在全局ResourceLoader列表中注销指定的ResourceLoader
* @param scheme
*/
protected static void removeLoader(String scheme) {
loaders.remove(scheme);
}
/**
* 全局ResourceLoader列表
*/
protected static Hashtable> loaders = new Hashtable>();
/**
* 缺省条件下的ResourceLoader列表
*/
static {
registerLoader("java", JavaResourceLoader.class);
registerLoader("http", HttpResourceLoader.class);
registerLoader("file", FileResourceLoader.class);
}
public static void main(String [] args){
ResourceFactory factory = new ResourceFactory();
try {
//InputStream __in = factory.load("http://localhost:8080/logicbus/services/", null);
//Document __doc = XmlTools.loadFromInputStream(__in);
//System.out.println(XmlTools.node2String(__doc.getDocumentElement()));
InputStream __in = factory.load("java:///com/anysoft/util/textdotter/resource/TextDotter.xml", null);
Document __doc = XmlTools.loadFromInputStream(__in);
System.out.println(XmlTools.node2String(__doc.getDocumentElement()));
__in = factory.load("file:///D:/ecloud/logicbus/profile.xml", null);
__doc = XmlTools.loadFromInputStream(__in);
System.out.println(XmlTools.node2String(__doc.getDocumentElement()));
}catch (Exception ex){
ex.printStackTrace();
}
}
}