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-server/src/main/java/com/google/gerrit/server/mail/NewChangeSender.java

@@ -0,0 +1,137 @@
+// Copyright (C) 2009 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.server.mail;
+
+import com.google.gerrit.reviewdb.Account;
+import com.google.gerrit.reviewdb.Change;
+import com.google.gerrit.server.ssh.SshInfo;
+import com.google.inject.Inject;
+
+import com.jcraft.jsch.HostKey;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+/** Sends an email alerting a user to a new change for them to review. */
+public abstract class NewChangeSender extends OutgoingEmail {
+  @Inject
+  private SshInfo sshInfo;
+
+  private final Set<Account.Id> reviewers = new HashSet<Account.Id>();
+  private final Set<Account.Id> extraCC = new HashSet<Account.Id>();
+
+  protected NewChangeSender(Change c) {
+    super(c, "newchange");
+  }
+
+  public void addReviewers(final Collection<Account.Id> cc) {
+    reviewers.addAll(cc);
+  }
+
+  public void addExtraCC(final Collection<Account.Id> cc) {
+    extraCC.addAll(cc);
+  }
+
+  @Override
+  protected void init() {
+    super.init();
+
+    setHeader("Message-ID", getChangeMessageThreadId());
+
+    add(RecipientType.TO, reviewers);
+    add(RecipientType.CC, extraCC);
+    rcptToAuthors(RecipientType.CC);
+  }
+
+  @Override
+  protected void format() {
+    formatSalutation();
+    formatChangeDetail();
+
+    appendText("\n");
+    appendText("  " + getPullUrl() + "\n");
+  }
+
+  private void formatSalutation() {
+    final String changeUrl = getChangeUrl();
+
+    if (reviewers.isEmpty()) {
+      formatDest();
+      if (changeUrl != null) {
+        appendText("\n");
+        appendText("    " + changeUrl + "\n");
+        appendText("\n");
+      }
+      appendText("\n");
+
+    } else {
+      appendText("Hello");
+      for (final Iterator<Account.Id> i = reviewers.iterator(); i.hasNext();) {
+        appendText(" ");
+        appendText(getNameFor(i.next()));
+        appendText(",");
+      }
+      appendText("\n");
+      appendText("\n");
+
+      appendText("I'd like you to do a code review.");
+      if (changeUrl != null) {
+        appendText("  Please visit\n");
+        appendText("\n");
+        appendText("    " + changeUrl + "\n");
+        appendText("\n");
+        appendText("to review the following change:\n");
+      }
+      appendText("\n");
+
+      formatDest();
+      appendText("\n");
+    }
+  }
+
+  private void formatDest() {
+    appendText("Change " + change.getKey().abbreviate());
+    appendText(" for ");
+    appendText(change.getDest().getShortName());
+    appendText(" in ");
+    appendText(projectName);
+    appendText(":\n");
+  }
+
+  private String getPullUrl() {
+    final List<HostKey> hostKeys = sshInfo.getHostKeys();
+    if (hostKeys.isEmpty()) {
+      return "";
+    }
+
+    final String host = hostKeys.get(0).getHost();
+    final StringBuilder r = new StringBuilder();
+    r.append("git pull ssh://");
+    if (host.startsWith("*:")) {
+      r.append(getGerritHost());
+      r.append(host.substring(2));
+    } else {
+      r.append(host);
+    }
+    r.append("/");
+    r.append(projectName);
+    r.append(" ");
+    r.append(patchSet.getRefName());
+    return r.toString();
+  }
+}