GUACAMOLE-292: Add support for email fields.

guacamole-ext/src/main/java/org/apache/guacamole/form/EmailField.java

@@ -0,0 +1,37 @@
+/*
+ * 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.guacamole.form;
+
+/**
+ * Represents a text field which may contain an email address.
+ */
+public class EmailField extends Field {
+
+    /**
+     * Creates a new EmailField with the given name.
+     *
+     * @param name
+     *     The unique name to associate with this field.
+     */
+    public EmailField(String name) {
+        super(name, Field.Type.EMAIL);
+    }
+
+}

guacamole-ext/src/main/java/org/apache/guacamole/form/Field.java

@@ -47,6 +47,12 @@ public class Field {
          */
         public static String TEXT = "TEXT";
 
+        /**
+         * An email address field. This field type generally behaves
+         * identically to arbitrary text fields, but has semantic differences.
+         */
+        public static String EMAIL = "EMAIL";
+
         /**
          * A username field. This field type generally behaves identically to
          * arbitrary text fields, but has semantic differences.