Rewrite our build as modular maven components

This refactoring splits the code up into different components, with
their own per-component CLASSPATH.  By moving all of our classes
into isolated components we can better isolate the classpaths and
try to avoid unexpected dependency problems.  It also allows us to
more clearly define which components are used by the GWT UI and
thus must be compiled under GWT, and which components are run on
the server and can therefore use more of the J2SE API.

Change-Id: I833cc22bacc5655d1c9099ed7c2b0e0a5b08855a
Signed-off-by: Shawn O. Pearce <sop@google.com>

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

@@ -0,0 +1,102 @@
+// Copyright (C) 2008 The Android Open Source Project
+//
+// 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 com.google.gerrit.client;
+
+import com.google.gerrit.client.rpc.RpcConstants;
+import com.google.gwt.event.dom.client.ClickEvent;
+import com.google.gwt.event.dom.client.ClickHandler;
+import com.google.gwt.user.client.rpc.StatusCodeException;
+import com.google.gwt.user.client.ui.Button;
+import com.google.gwt.user.client.ui.FlowPanel;
+import com.google.gwt.user.client.ui.Label;
+import com.google.gwtexpui.safehtml.client.SafeHtml;
+import com.google.gwtexpui.user.client.AutoCenterDialogBox;
+import com.google.gwtjsonrpc.client.RemoteJsonException;
+
+/** A dialog box showing an error message, when bad things happen. */
+public class ErrorDialog extends AutoCenterDialogBox {
+  private final FlowPanel body;
+
+  protected ErrorDialog() {
+    super(/* auto hide */true, /* modal */true);
+    setText(Gerrit.C.errorDialogTitle());
+
+    body = new FlowPanel();
+    final FlowPanel buttons = new FlowPanel();
+    buttons.setStyleName("gerrit-ErrorDialog-Buttons");
+    final Button closey = new Button();
+    closey.setText(Gerrit.C.errorDialogClose());
+    closey.addClickHandler(new ClickHandler() {
+      @Override
+      public void onClick(ClickEvent event) {
+        hide();
+      }
+    });
+    buttons.add(closey);
+
+    final FlowPanel center = new FlowPanel();
+    center.setStyleName("gerrit-ErrorDialog");
+    center.add(body);
+    center.add(buttons);
+    add(center);
+  }
+
+  /** Create a dialog box to show a single message string. */
+  public ErrorDialog(final String message) {
+    this();
+    body.add(new Label(message));
+  }
+
+  /** Create a dialog box to show a single message string. */
+  public ErrorDialog(final SafeHtml message) {
+    this();
+    body.add(message.toBlockWidget());
+  }
+
+  /** Create a dialog box to nicely format an exception. */
+  public ErrorDialog(final Throwable what) {
+    this();
+
+    String cn;
+    if (what instanceof RemoteJsonException) {
+      cn = RpcConstants.C.errorRemoteJsonException();
+
+    } else if (what instanceof StatusCodeException) {
+      cn = RpcConstants.C.errorServerUnavailable();
+
+    } else {
+      cn = what.getClass().getName();
+      if (cn.startsWith("java.lang.")) {
+        cn = cn.substring("java.lang.".length());
+      } else if (cn.startsWith("com.google.gerrit.")) {
+        cn = cn.substring(cn.lastIndexOf('.') + 1);
+      }
+      if (cn.endsWith("Exception")) {
+        cn = cn.substring(0, cn.length() - "Exception".length());
+      } else if (cn.endsWith("Error")) {
+        cn = cn.substring(0, cn.length() - "Error".length());
+      }
+    }
+
+    body.add(label(cn, "gerrit-ErrorDialog-ErrorType"));
+    body.add(new Label(what.getMessage()));
+  }
+
+  private static Label label(final String what, final String style) {
+    final Label r = new Label(what);
+    r.setStyleName(style);
+    return r;
+  }
+}