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/EmailHeader.java

@@ -0,0 +1,111 @@
+// 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 java.io.IOException;
+import java.io.Writer;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+abstract class EmailHeader {
+  abstract boolean isEmpty();
+
+  abstract void write(Writer w) throws IOException;
+
+  static class String extends EmailHeader {
+    private java.lang.String value;
+
+    String(java.lang.String v) {
+      value = v;
+    }
+
+    @Override
+    boolean isEmpty() {
+      return value == null || value.length() == 0;
+    }
+
+    @Override
+    void write(Writer w) throws IOException {
+      w.write(value);
+    }
+  }
+
+  static class Date extends EmailHeader {
+    private java.util.Date value;
+
+    Date(java.util.Date v) {
+      value = v;
+    }
+
+    @Override
+    boolean isEmpty() {
+      return value == null;
+    }
+
+    @Override
+    void write(Writer w) throws IOException {
+      final SimpleDateFormat fmt;
+      // Mon, 1 Jun 2009 10:49:44 -0700
+      fmt = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.ENGLISH);
+      w.write(fmt.format(value));
+    }
+  }
+
+  static class AddressList extends EmailHeader {
+    private final List<Address> list = new ArrayList<Address>();
+
+    AddressList() {
+    }
+
+    AddressList(Address addr) {
+      add(addr);
+    }
+
+    void add(Address addr) {
+      list.add(addr);
+    }
+
+    @Override
+    boolean isEmpty() {
+      return list.isEmpty();
+    }
+
+    @Override
+    void write(Writer w) throws IOException {
+      int len = 8;
+      boolean firstAddress = true;
+      boolean needComma = false;
+      for (final Address addr : list) {
+        java.lang.String s = addr.toHeaderString();
+        if (firstAddress) {
+          firstAddress = false;
+        } else if (72 < len + s.length()) {
+          w.write(",\r\n\t");
+          len = 8;
+          needComma = false;
+        }
+
+        if (needComma) {
+          w.write(", ");
+        }
+        w.write(s);
+        len += s.length();
+        needComma = true;
+      }
+    }
+  }
+}