package com.quickwebframework.framework.impl;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.ServiceEvent;
import com.quickwebframework.core.Activator;
import com.quickwebframework.framework.FrameworkContext;
import com.quickwebframework.framework.WebContext;
import com.quickwebframework.util.pattern.WildcardPattern;
public class ServletServletContext extends FrameworkContext {
private static Log log = LogFactory.getLog(ServletServletContext.class);
private static ServletServletContext instance;
public static ServletServletContext getInstance() {
if (instance == null)
instance = new ServletServletContext();
return instance;
}
// 路径与Servlet映射Map
private static Map<String, Servlet> pathServletMap;
// 路径与通配符模板对象映射Map
private static Map<String, WildcardPattern> pathWildcardPatternMap;
public ServletServletContext() {
pathServletMap = new HashMap<String, Servlet>();
pathWildcardPatternMap = new HashMap<String, WildcardPattern>();
}
@Override
protected BundleContext getBundleContext() {
return Activator.getContext();
}
@Override
protected void init(int arg) {
}
@Override
protected void destory(int arg) {
}
@Override
protected void bundleChanged(BundleEvent event) {
}
@Override
protected void serviceChanged(ServiceEvent event) {
}
/**
* 根据别名(路径)找到Servlet
*
* @param alias
* @return
*/
public static Servlet getServletByPath(String alias) {
for (String path : pathServletMap.keySet()) {
if (path.startsWith("*.") || path.endsWith("*")) {
WildcardPattern pattern = pathWildcardPatternMap.get(path);
if (pattern == null) {
pattern = new WildcardPattern(path);
pathWildcardPatternMap.put(path, pattern);
}
if (pattern.implies(alias)) {
return pathServletMap.get(path);
}
} else {
if (path.equals(alias)) {
return pathServletMap.get(alias);
}
}
}
return null;
}
/**
* 获取所有Servlet所注册的路径数组
*
* @return
*/
public static String[] getAllServletPaths() {
return pathServletMap.keySet().toArray(new String[0]);
}
/**
* 注册Servlet
*
* @param path
* @param servlet
* @param initparams
* @throws javax.servlet.ServletException
*/
public static void registerServlet(String path, Servlet servlet,
Dictionary<String, Object> initparams) {
if (pathServletMap.containsKey(path)) {
throw new RuntimeException(String.format(
"路径[%s]已经被映射到了Servlet[%s]", path, pathServletMap.get(path)));
}
final Servlet servletMirror = servlet;
final Dictionary<String, Object> initparamsMirror = initparams;
// 初始化Servlet
try {
servlet.init(new ServletConfig() {
public String getInitParameter(String arg0) {
if (initparamsMirror == null)
return null;
Object obj = initparamsMirror.get(arg0);
if (obj == null)
return null;
return obj.toString();
}
public Enumeration<String> getInitParameterNames() {
if (initparamsMirror == null)
return null;
return initparamsMirror.keys();
}
public ServletContext getServletContext() {
return WebContext.getServletContext();
}
public String getServletName() {
return servletMirror.toString();
}
});
} catch (Exception ex) {
throw new RuntimeException(String.format(
"注册Servlet[%s]到路径[%s]时出错。", servlet, path), ex);
}
pathServletMap.put(path, servlet);
log.debug(String.format("已注册路径[%s]到Servlet[%s].", path, servlet));
}
/**
* 注册资源
*
* @param alias
* @param name
*/
public static void registerResources(String alias, String name) {
throw new RuntimeException("此方法还未实现！");
}
/**
* 取消注册Servlet
*
* @param path
*/
public static void unregisterServlet(String path) {
if (!pathServletMap.containsKey(path))
return;
Servlet servlet = pathServletMap.get(path);
pathServletMap.remove(path);
log.debug(String.format("已取消注册路径为[%s]的Servlet[%s].", path, servlet));
}
}