Amend some validators to cope with null. Add validatable interface.

Change-Id: Ic952dfc1c8d2d25da366445d0f40bf573cb76c39
Reviewed-on: http://gerrit.dmdirc.com/2237
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

src/com/dmdirc/util/validators/FileNameValidator.java

     /** {@inheritDoc} */
     @Override
     public ValidationResponse validate(final String object) {
-        if (object.matches(FILENAME_REGEX)) {
-            return new ValidationResponse();
-        } else {
+        if (object == null || !object.matches(FILENAME_REGEX)) {
             return new ValidationResponse(FAILURE_REASON);
         }
+        return new ValidationResponse();
     }
 }

src/com/dmdirc/util/validators/IdentValidator.java

     /** {@inheritDoc} */
     @Override
     public ValidationResponse validate(final String object) {
-        if (object.matches(IDENT_REGEX)) {
-            return new ValidationResponse();
-        } else {
+        if (object == null || !object.matches(IDENT_REGEX)) {
             return new ValidationResponse(FAILURE_REASON);
         }
+        return new ValidationResponse();
     }
 }

src/com/dmdirc/util/validators/NicknameValidator.java

     /** {@inheritDoc} */
     @Override
     public ValidationResponse validate(final String object) {
-        if (object.matches(NICKNAME_REGEX)) {
-            return new ValidationResponse();
-        } else {
+        if (object == null || !object.matches(NICKNAME_REGEX)) {
             return new ValidationResponse(FAILURE_REASON);
+        } else {
+            return new ValidationResponse();
         }
     }
 }

src/com/dmdirc/util/validators/Validatable.java

+/*
+ * Copyright (c) 2006-2010 Chris Smith, Shane Mc Cormack, Gregory Holmes
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.dmdirc.util.validators;
+
+/**
+ * Marks a component as validatable.
+ */
+public interface Validatable {
+
+    /**
+     * Sets the validation response for a component.
+     *
+     * @param validation Validation response to show
+     */
+    void setValidation(ValidationResponse validation);
+
+}