package com.googlecode.richrest.server.mapper;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import com.googlecode.richrest.server.ActionMapper;
import com.googlecode.richrest.server.ActionServletContext;
import com.googlecode.richrest.server.ServletSerializer;
import com.googlecode.richrest.server.serializer.StreamServletSerializer;
import com.googlecode.richrest.server.serializer.TextServletSerializer;
import com.googlecode.richrest.util.ServiceUtils;
import com.googlecode.richrest.util.logger.Logger;
import com.googlecode.richrest.util.logger.LoggerFactory;
import com.googlecode.richrest.util.serializer.Serializer;
import com.googlecode.richrest.util.serializer.stream.StreamSerializer;
import com.googlecode.richrest.util.serializer.text.TextSerializer;
/**
* 后缀Action映射器
* @author <a href="mailto:liangfei0201@gmail.com">liangfei</a>
*/
public class DefaultActionMapper implements ActionMapper {
/**
* 日志输出接口
*/
protected final Logger logger = LoggerFactory.getLogger(getClass());
protected final Map<String, ServletSerializer> serializers = new HashMap<String, ServletSerializer>();
private boolean directoryMapping;
private boolean extensionMapping;
public DefaultActionMapper() {
init(ActionServletContext.getContext().getServletContext(), ActionServletContext.getContext().getServletConfig());
}
@SuppressWarnings("unchecked")
protected void init(ServletContext servletContext, ServletConfig servletConfig) {
directoryMapping = isDirectoryMapping(servletContext, servletConfig);
extensionMapping = isExtensionMapping(servletContext, servletConfig);
Collection<Serializer> serializerInstances = ServiceUtils.getServiceInstances(Serializer.class);
for (Serializer serializer : serializerInstances) {
String contentType = serializer.getContentType();
if (contentType != null)
contentType = contentType.toLowerCase();
if (serializer instanceof ServletSerializer)
serializers.put(contentType, (ServletSerializer)serializer);
else if (serializer instanceof TextSerializer)
serializers.put(contentType, new TextServletSerializer((TextSerializer)serializer));
else if (serializer instanceof StreamSerializer)
serializers.put(contentType, new StreamServletSerializer((StreamSerializer)serializer));
}
}
public void shutdown() {}
/**
* 目录映射的配置参数名
*/
protected static final String DIRECTORY_MAPPING_PARAM_NAME = "directoryMapping";
/**
* 缺省后缀映射为false
*/
protected static final boolean DEFAULT_DIRECTORY_MAPPING = false;
/**
* 是否为目录映射
* @return 是否为目录映射
*/
protected boolean isDirectoryMapping(ServletContext servletContext, ServletConfig servletConfig) {
String directoryMappingConfig = servletConfig.getInitParameter(DIRECTORY_MAPPING_PARAM_NAME);
if (directoryMappingConfig == null)
return DEFAULT_DIRECTORY_MAPPING;
directoryMappingConfig = directoryMappingConfig.trim();
if (directoryMappingConfig.length() == 0)
return DEFAULT_DIRECTORY_MAPPING;
return "true".equals(directoryMappingConfig);
}
/**
* 后缀映射的配置参数名
*/
protected static final String EXTENSION_MAPPING_PARAM_NAME = "extensionMapping";
/**
* 缺省后缀映射为true
*/
protected static final boolean DEFAULT_EXTENSION_MAPPING = true;
/**
* 是否为后缀映射
* @return 是否为后缀映射
*/
protected boolean isExtensionMapping(ServletContext servletContext, ServletConfig servletConfig) {
String extensionMappingConfig = servletConfig.getInitParameter(EXTENSION_MAPPING_PARAM_NAME);
if (extensionMappingConfig == null)
return DEFAULT_EXTENSION_MAPPING;
extensionMappingConfig = extensionMappingConfig.trim();
if (extensionMappingConfig.length() == 0)
return DEFAULT_EXTENSION_MAPPING;
return "true".equals(extensionMappingConfig);
}
/**
* 获取Action名称
* @param request 请求信息
* @return Action名称
*/
public String getActionName(HttpServletRequest request) {
String actionName = request.getRequestURI();
String contextPath = request.getContextPath();
if (contextPath != null && ! "/".equals(contextPath))
actionName = actionName.substring(contextPath.length());
if (actionName.startsWith("/"))
actionName = actionName.substring(1);
if (directoryMapping) {
int directoryIndex = actionName.indexOf('/');
if (directoryIndex != -1)
actionName = actionName.substring(directoryIndex + 1);
}
if (extensionMapping) {
int extensionIndex = actionName.lastIndexOf('.');
if (extensionIndex != -1)
actionName = actionName.substring(0, extensionIndex);
}
return actionName;
}
public ServletSerializer getSerializer(HttpServletRequest request) {
ServletSerializer serializer = getSerializer(request.getHeader("Accept")); // 根据接收类型查找
if (serializer == null)
serializer = getSerializer(request.getContentType()); // 如果没有设定接收类型，使用请求类型查找
return serializer;
}
protected ServletSerializer getSerializer(String contentType) {
if (contentType != null)
contentType = contentType.trim().toLowerCase();
return serializers.get(contentType);
}
protected ServletSerializer addSerializer(String contentType, ServletSerializer serializer) {
return serializers.put(contentType, serializer);
}
protected ServletSerializer removeSerializer(String contentType) {
return serializers.remove(contentType);
}
}