org.jaxygen.apibrowser.APIBrowser.java Source code

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Here is the source code for org.jaxygen.apibrowser.APIBrowser.java

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/*
 * Copyright 2012 Artur Keska.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jaxygen.apibrowser;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.rmi.ServerException;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.jaxygen.mime.MimeTypeAnalyser;
import org.jaxygen.apibrowser.pages.ClassMethodsPage;
import org.jaxygen.apibrowser.pages.ClassesListPage;
import org.jaxygen.apibrowser.pages.ClassesSnippestPage;
import org.jaxygen.apibrowser.pages.MethodInvokerPage;
import org.jaxygen.apibrowser.pages.Page;

/**
 *
 * @author Artur Keska
 */
public class APIBrowser extends HttpServlet {
    private String classRegistryName = null;
    private String beansPathName = null;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        classRegistryName = config.getInitParameter("classRegistry");
        beansPathName = config.getInitParameter("servicePath");
    }

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");

        try {

            final String resource = request.getParameter("resource");

            if (resource != null) {
                postResource(resource, response);
            } else {
                renderApiPage(response, request);
            }
        } catch (Exception ex) {
            throw new ServerException("Service error", ex);
        } finally {
            //out.close();
        }
    }

    private InputStream openResourceStream(String resource) {
        InputStream is;
        is = Thread.currentThread().getContextClassLoader().getResourceAsStream(resource);
        return is;
    }

    private void renderApiPage(HttpServletResponse response, HttpServletRequest request)
            throws InvocationTargetException, IllegalArgumentException, SecurityException, ServletException,
            NamingException, InstantiationException, NoSuchMethodException, IllegalAccessException,
            ClassNotFoundException, IOException {
        response.setContentType("text/html");
        Page page;
        final String pageName = request.getParameter("page");
        if (ClassMethodsPage.NAME.equals(pageName)) {
            page = new ClassMethodsPage(getServletContext(), request, classRegistryName, beansPathName);
        } else if (MethodInvokerPage.NAME.equals(pageName)) {
            page = new MethodInvokerPage(getServletContext(), request, classRegistryName, beansPathName);
        } else if (ClassesListPage.NAME.equals(pageName)) {
            page = new ClassesListPage(getServletContext(), request, classRegistryName, beansPathName);
        } else {
            page = new ClassesSnippestPage(getServletContext(), request, classRegistryName, beansPathName);
        }
        response.getWriter().append(page.render());
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private void postResource(String resource, HttpServletResponse response) throws IOException {
        InputStream is = null;
        try {
            is = openResourceStream(resource);
            if (is != null) {
                log("Sending resource as stream");
                response.setContentType(MimeTypeAnalyser.getMimeForExtension(resource));
                IOUtils.copy(is, response.getOutputStream());
            }
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }
}