001
014
015 package com.liferay.portal.struts;
016
017 import com.liferay.portal.kernel.servlet.HttpHeaders;
018 import com.liferay.portal.kernel.servlet.ServletContextPool;
019 import com.liferay.portal.kernel.util.ContentTypes;
020 import com.liferay.portal.kernel.util.GetterUtil;
021 import com.liferay.portal.kernel.util.ParamUtil;
022 import com.liferay.portal.kernel.util.Validator;
023 import com.liferay.portal.util.PortalUtil;
024 import com.liferay.portal.util.WebKeys;
025
026 import java.io.PrintWriter;
027
028 import javax.servlet.RequestDispatcher;
029 import javax.servlet.ServletContext;
030 import javax.servlet.http.HttpServletRequest;
031 import javax.servlet.http.HttpServletResponse;
032
033 import org.apache.struts.action.Action;
034 import org.apache.struts.action.ActionForm;
035 import org.apache.struts.action.ActionForward;
036 import org.apache.struts.action.ActionMapping;
037
038
041 public abstract class JSONAction extends Action {
042
043 @Override
044 public ActionForward execute(
045 ActionMapping mapping, ActionForm form, HttpServletRequest request,
046 HttpServletResponse response)
047 throws Exception {
048
049 if (rerouteExecute(request, response)) {
050 return null;
051 }
052
053 String callback = ParamUtil.getString(request, "callback");
054 String instance = ParamUtil.getString(request, "inst");
055
056 String json = null;
057
058 try {
059 json = getJSON(mapping, form, request, response);
060
061 if (Validator.isNotNull(callback)) {
062 json = callback + "(" + json + ");";
063 }
064 else if (Validator.isNotNull(instance)) {
065 json = "var " + instance + "=" + json + ";";
066 }
067 }
068 catch (Exception e) {
069 PortalUtil.sendError(
070 HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e, request,
071 response);
072
073 return null;
074 }
075
076 boolean refresh = ParamUtil.getBoolean(request, "refresh");
077
078 if (refresh) {
079 return mapping.findForward(ActionConstants.COMMON_REFERER);
080 }
081 else if (Validator.isNotNull(json)) {
082 response.setContentType(ContentTypes.TEXT_JAVASCRIPT);
083 response.setHeader(
084 HttpHeaders.CACHE_CONTROL,
085 HttpHeaders.CACHE_CONTROL_NO_CACHE_VALUE);
086
087 PrintWriter printWriter = response.getWriter();
088
089 printWriter.write(json);
090
091 printWriter.close();
092 }
093
094 return null;
095 }
096
097 public abstract String getJSON(
098 ActionMapping mapping, ActionForm form, HttpServletRequest request,
099 HttpServletResponse response)
100 throws Exception;
101
102 public void setServletContext(ServletContext servletContext) {
103 _servletContext = servletContext;
104 }
105
106 protected String getReroutePath() {
107 return null;
108 }
109
110 protected boolean rerouteExecute(
111 HttpServletRequest request, HttpServletResponse response)
112 throws Exception {
113
114 String reroutePath = getReroutePath();
115
116 if (Validator.isNull(reroutePath)) {
117 return false;
118 }
119
120 String requestServletContextName = ParamUtil.getString(
121 request, "servletContextName");
122
123 if (Validator.isNull(requestServletContextName)) {
124 return false;
125 }
126
127 ServletContext servletContext = _servletContext;
128
129 if (servletContext == null) {
130 servletContext = (ServletContext)request.getAttribute(WebKeys.CTX);
131 }
132
133 String servletContextName = GetterUtil.getString(
134 servletContext.getServletContextName());
135
136 if (servletContextName.equals(requestServletContextName)) {
137 return false;
138 }
139
140 ServletContext requestServletContext = ServletContextPool.get(
141 requestServletContextName);
142
143 if (requestServletContext == null) {
144 return false;
145 }
146
147 RequestDispatcher requestDispatcher =
148 requestServletContext.getRequestDispatcher(reroutePath);
149
150 if (requestDispatcher == null) {
151 return false;
152 }
153
154 requestDispatcher.forward(request, response);
155
156 return true;
157 }
158
159 protected ServletContext _servletContext;
160
161 }