1 files changed, 358 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java b/tags/java/sca/1.5.1/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java
new file mode 100644
index 0000000000..045cae4e75
--- /dev/null
+++ b/tags/java/sca/1.5.1/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java
@@ -0,0 +1,358 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.tuscany.sca.host.webapp;
+
+import java.beans.Introspector;
+import java.io.File;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.net.InetAddress;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.net.UnknownHostException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.logging.Logger;
+
+import javax.naming.InitialContext;
+import javax.naming.NamingException;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+
+import org.apache.commons.logging.LogFactory;
+import org.apache.tuscany.sca.host.embedded.SCADomain;
+import org.apache.tuscany.sca.host.http.SecurityContext;
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.host.http.ServletMappingException;
+
+/**
+ * ServletHost implementation for use in a webapp environment.
+ * 
+ * FIXME: using a static singleton seems a big hack but how should it be shared?
+ * Need some way for TuscanyServlet to pull it out.
+ *
+ * @version $Rev$ $Date$
+ */
+public class WebAppServletHost implements ServletHost {
+    private static final Logger logger = Logger.getLogger(WebAppServletHost.class.getName());
+
+    public static final String SCA_DOMAIN_ATTRIBUTE = "org.apache.tuscany.sca.SCADomain";
+
+    private static WebAppServletHost instance = null;
+
+    private Map<String, Servlet> servlets;
+    private SCADomain scaDomain;
+    private String contextPath = "/";
+    private int defaultPortNumber = 8080;
+    private String contributionRoot;
+
+    private ServletContext servletContext;
+
+    private WebAppServletHost() {
+        servlets = new HashMap<String, Servlet>();
+    }
+
+    public void setDefaultPort(int port) {
+        defaultPortNumber = port;
+    }
+
+    public int getDefaultPort() {
+        return defaultPortNumber;
+    }
+
+    public void addServletMapping(String suri, Servlet servlet) throws ServletMappingException {
+        addServletMapping(suri, servlet, null);
+    }
+    
+    public void addServletMapping(String suri, Servlet servlet, SecurityContext securityContext) throws ServletMappingException {
+        URI pathURI = URI.create(suri);
+
+        // Make sure that the path starts with a /
+        suri = pathURI.getPath();
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // In a webapp just use the given path and ignore the host and port
+        // as they are fixed by the Web container
+        servlets.put(suri, servlet);
+
+        logger.info("Added Servlet mapping: " + suri);
+    }
+
+    public Servlet removeServletMapping(String suri) throws ServletMappingException {
+        URI pathURI = URI.create(suri);
+
+        // Make sure that the path starts with a /
+        suri = pathURI.getPath();
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // In a webapp just use the given path and ignore the host and port
+        // as they are fixed by the Web container
+        return servlets.remove(suri);
+    }
+
+    public Servlet getServletMapping(String suri) throws ServletMappingException {
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // Get the Servlet mapped to the given path
+        Servlet servlet = servlets.get(suri);
+        return servlet;
+    }
+
+    public URL getURLMapping(String suri) throws ServletMappingException {
+        URI uri = URI.create(suri);
+
+        // Get the URI scheme and port
+        String scheme = uri.getScheme();
+        if (scheme == null) {
+            scheme = "http";
+        }
+        int portNumber = uri.getPort();
+        if (portNumber == -1) {
+            portNumber = defaultPortNumber;
+        }
+
+        // Get the host
+        String host;
+        try {
+            host = InetAddress.getLocalHost().getHostName();
+        } catch (UnknownHostException e) {
+            host = "localhost";
+        }
+
+        // Construct the URL
+        String path = uri.getPath();
+        if (!path.startsWith("/")) {
+            path = '/' + path;
+        }
+
+        if (contextPath != null && !path.startsWith(contextPath)) {
+            path = contextPath + path;
+        }
+
+        URL url;
+        try {
+            url = new URL(scheme, host, portNumber, path);
+        } catch (MalformedURLException e) {
+            throw new ServletMappingException(e);
+        }
+        return url;
+    }
+
+    public RequestDispatcher getRequestDispatcher(String suri) throws ServletMappingException {
+
+        // Make sure that the path starts with a /
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        suri = contextPath + suri;
+
+        // Get the Servlet mapped to the given path
+        Servlet servlet = servlets.get(suri);
+        if (servlet != null) {
+            return new WebAppRequestDispatcher(suri, servlet);
+        }
+
+        for (Map.Entry<String, Servlet> entry : servlets.entrySet()) {
+            String servletPath = entry.getKey();
+            if (servletPath.endsWith("*")) {
+                servletPath = servletPath.substring(0, servletPath.length() - 1);
+                if (suri.startsWith(servletPath)) {
+                    // entry key is contextPath/servletPath, WebAppRequestDispatcher only wants servletPath
+                    return new WebAppRequestDispatcher(entry.getKey().substring(contextPath.length()), entry.getValue());
+                } else {
+                    if ((suri + "/").startsWith(servletPath)) {
+                        return new WebAppRequestDispatcher(entry.getKey().substring(contextPath.length()), entry.getValue());
+                    }
+                }
+            }
+        }
+
+        // No Servlet found
+        return null;
+    }
+
+    public static WebAppServletHost getInstance() {
+    	if (instance == null){
+    		instance = new WebAppServletHost();
+    	}
+        return instance;
+    }
+
+    public void init(ServletConfig config) throws ServletException {
+
+        servletContext = config.getServletContext();
+        if (servletContext.getAttribute(SCA_DOMAIN_ATTRIBUTE) == null) {
+            initContextPath(config);
+            String domainURI = "http://localhost/" + contextPath;
+            contributionRoot = getContributionRoot(servletContext);
+            // logger.info("Contribution: " + contributionRoot);
+            System.setProperty(SCADomain.class.getName(), WebSCADomain.class.getName());
+            this.scaDomain = SCADomain.newInstance(domainURI, contributionRoot);
+            servletContext.setAttribute(SCA_DOMAIN_ATTRIBUTE, scaDomain);
+        }
+
+        // Initialize the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.init(config);
+        }
+        
+    }
+
+    protected String getContributionRoot(ServletContext servletContext) {
+        String contributionRoot = null;
+        try {
+
+            InitialContext ic = new InitialContext();
+            URL repoURL = (URL)ic.lookup("java:comp/env/url/contributions");
+
+            contributionRoot = repoURL.toString();
+
+        } catch (NamingException e) {
+
+            // ignore exception and use default location
+
+            try {
+                
+                String root = servletContext.getInitParameter("contributionRoot");
+                if (root == null || root.length() < 1) {
+                    root = "/";
+                }
+                URL rootURL = servletContext.getResource(root);
+                if (rootURL.getProtocol().equals("jndi")) {
+                    //this is Tomcat case, we should use getRealPath
+                    File warRootFile = new File(servletContext.getRealPath(root));
+                    contributionRoot = warRootFile.toURL().toString();
+                } else {
+                    //this is Jetty case
+                    contributionRoot = rootURL.toString();
+                }
+
+            } catch (MalformedURLException mf) {
+                //ignore, pass null
+            }
+        }
+
+        return contributionRoot;
+    }
+
+    /**
+     * Initializes the contextPath
+     * The 2.5 Servlet API has a getter for this, for pre 2.5 Servlet
+     * containers use an init parameter.
+     */
+    @SuppressWarnings("unchecked")
+    public void initContextPath(ServletConfig config) {
+        
+        if (Collections.list(config.getInitParameterNames()).contains("contextPath")) {
+            contextPath = config.getInitParameter("contextPath");
+        } else {
+            // The getContextPath() is introduced since Servlet 2.5
+            ServletContext context = config.getServletContext();
+            try {
+                // Try to get the method anyway since some ServletContext impl has this method even before 2.5
+                Method m = context.getClass().getMethod("getContextPath", new Class[] {});
+                contextPath = (String)m.invoke(context, new Object[] {});
+            } catch (Exception e) {
+                logger.warning("Servlet level is: " + context.getMajorVersion() + "." + context.getMinorVersion());
+                throw new IllegalStateException("'contextPath' init parameter must be set for pre-2.5 servlet container");
+            }
+        }
+
+        logger.info("ContextPath: " + contextPath);
+    }
+
+    void destroy() {
+
+        // Destroy the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.destroy();
+        }
+
+        // Close the SCA domain
+        if (scaDomain != null) {
+            scaDomain.close();
+            if (scaDomain instanceof WebSCADomain) {
+                ((WebSCADomain)scaDomain).destroy();
+            }
+            servletContext.setAttribute(SCA_DOMAIN_ATTRIBUTE, null);
+            scaDomain = null;
+        }
+        
+        servletContext = null;
+        instance = null;
+        servlets.clear();
+        LogFactory.release(this.getClass().getClassLoader());
+        Introspector.flushCaches();      
+    }
+
+    public String getContextPath() {
+        return contextPath;
+    }
+
+    public void setContextPath(String path) {
+        //        if (!contextPath.equals(path)) {
+        //            throw new IllegalArgumentException("invalid context path for webapp, existing context path: " + contextPath + " new contextPath: " + path);
+        //        }
+    }
+
+    /**
+     * TODO: How context paths work is still up in the air so for now
+     *    this hacks in a path that gets some samples working
+     *    can't use setContextPath as NodeImpl calls that later
+     */
+    public void setContextPath2(String path) {
+        if (path != null && path.length() > 0) {
+            this.contextPath = path;
+        }
+    }
+
+    public String getContributionRoot() {
+        return contributionRoot;
+    }
+
+    public void setAttribute(String name, Object value) {
+        servletContext.setAttribute(name, value);
+    }
+}