Allow setting the filter for project/group list screen by URL parameter

This allows to bookmark a filtered screen and share links to filtered
results. E.g. to send somebody a list of all Gerrit plugins the
following link could be used:
https://gerrit-review.googlesource.com/#/admin/projects/?filter=plugins

Change-Id: I7417356a48f7cd8ece7e3d38c41114c571d51955
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-gwtui/src/main/java/com/google/gerrit/client/Dispatcher.java

@@ -679,14 +679,36 @@ public class Dispatcher {
           Gerrit.display(token, new GroupListScreen());
 
         } else if (matchPrefix("/admin/groups/", token)) {
-          group();
+          String rest = skip(token);
+          if (rest.startsWith("?")) {
+            Gerrit.display(token, new GroupListScreen(rest.substring(1)));
+          } else {
+            group();
+          }
+
+        } else if (matchPrefix("/admin/groups", token)) {
+          String rest = skip(token);
+          if (rest.startsWith("?")) {
+            Gerrit.display(token, new GroupListScreen(rest.substring(1)));
+          }
 
         } else if (matchExact(ADMIN_PROJECTS, token)
             || matchExact("/admin/projects", token)) {
           Gerrit.display(token, new ProjectListScreen());
 
         } else if (matchPrefix("/admin/projects/", token)) {
-          Gerrit.display(token, selectProject());
+            String rest = skip(token);
+            if (rest.startsWith("?")) {
+              Gerrit.display(token, new ProjectListScreen(rest.substring(1)));
+            } else {
+              Gerrit.display(token, selectProject());
+            }
+
+        } else if (matchPrefix("/admin/projects", token)) {
+          String rest = skip(token);
+          if (rest.startsWith("?")) {
+            Gerrit.display(token, new ProjectListScreen(rest.substring(1)));
+          }
 
         } else if (matchPrefix(ADMIN_PLUGINS, token)
             || matchExact("/admin/plugins", token)) {

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/GroupListScreen.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.admin;
 
+import static com.google.gerrit.common.PageLinks.ADMIN_GROUPS;
+
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.groups.GroupMap;
 import com.google.gerrit.client.rpc.ScreenLoadCallback;
@@ -23,6 +25,7 @@ import com.google.gerrit.client.ui.IgnoreOutdatedFilterResultsCallbackWrapper;
 import com.google.gerrit.common.PageLinks;
 import com.google.gwt.event.dom.client.KeyUpEvent;
 import com.google.gwt.event.dom.client.KeyUpHandler;
+import com.google.gwt.http.client.URL;
 import com.google.gwt.user.client.ui.HorizontalPanel;
 import com.google.gwt.user.client.ui.Label;
 import com.google.gwtexpui.globalkey.client.NpTextBox;
@@ -32,6 +35,22 @@ public class GroupListScreen extends AccountScreen implements FilteredUserInterf
   private NpTextBox filterTxt;
   private String subname;
 
+  public GroupListScreen() {
+  }
+
+  public GroupListScreen(String params) {
+    for (String kvPair : params.split("[,;&]")) {
+      String[] kv = kvPair.split("=", 2);
+      if (kv.length != 2 || kv[0].isEmpty()) {
+        continue;
+      }
+
+      if ("filter".equals(kv[0])) {
+        subname = URL.decodeQueryString(kv[1]);
+      }
+    }
+  }
+
   @Override
   protected void onLoad() {
     super.onLoad();
@@ -39,6 +58,8 @@ public class GroupListScreen extends AccountScreen implements FilteredUserInterf
   }
 
   private void refresh() {
+    setToken(subname == null || "".equals(subname) ? ADMIN_GROUPS
+        : ADMIN_GROUPS + "?filter=" + URL.encodeQueryString(subname));
     GroupMap.match(subname,
         new IgnoreOutdatedFilterResultsCallbackWrapper<GroupMap>(this,
             new ScreenLoadCallback<GroupMap>(this) {
@@ -87,6 +108,9 @@ public class GroupListScreen extends AccountScreen implements FilteredUserInterf
   @Override
   public void onShowView() {
     super.onShowView();
+    if (subname != null) {
+      filterTxt.setCursorPos(subname.length());
+    }
     filterTxt.setFocus(true);
   }
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/ProjectListScreen.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.client.admin;
 
+import static com.google.gerrit.common.PageLinks.ADMIN_PROJECTS;
+
 import com.google.gerrit.client.Dispatcher;
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.GitwebLink;
@@ -29,6 +31,7 @@ import com.google.gerrit.client.ui.Screen;
 import com.google.gerrit.common.PageLinks;
 import com.google.gwt.event.dom.client.KeyUpEvent;
 import com.google.gwt.event.dom.client.KeyUpHandler;
+import com.google.gwt.http.client.URL;
 import com.google.gwt.user.client.History;
 import com.google.gwt.user.client.ui.Anchor;
 import com.google.gwt.user.client.ui.FlowPanel;
@@ -41,6 +44,22 @@ public class ProjectListScreen extends Screen implements FilteredUserInterface {
   private NpTextBox filterTxt;
   private String subname;
 
+  public ProjectListScreen() {
+  }
+
+  public ProjectListScreen(String params) {
+    for (String kvPair : params.split("[,;&]")) {
+      String[] kv = kvPair.split("=", 2);
+      if (kv.length != 2 || kv[0].isEmpty()) {
+        continue;
+      }
+
+      if ("filter".equals(kv[0])) {
+        subname = URL.decodeQueryString(kv[1]);
+      }
+    }
+  }
+
   @Override
   protected void onLoad() {
     super.onLoad();
@@ -48,6 +67,8 @@ public class ProjectListScreen extends Screen implements FilteredUserInterface {
   }
 
   private void refresh() {
+    setToken(subname == null || "".equals(subname) ? ADMIN_PROJECTS
+        : ADMIN_PROJECTS + "?filter=" + URL.encodeQueryString(subname));
     ProjectMap.match(subname,
         new IgnoreOutdatedFilterResultsCallbackWrapper<ProjectMap>(this,
             new ScreenLoadCallback<ProjectMap>(this) {
@@ -141,6 +162,9 @@ public class ProjectListScreen extends Screen implements FilteredUserInterface {
   @Override
   public void onShowView() {
     super.onShowView();
+    if (subname != null) {
+      filterTxt.setCursorPos(subname.length());
+    }
     filterTxt.setFocus(true);
   }